WO2014103888A1 - Aluminum-based electrically conductive material, and cable manufactured using same - Google Patents

Abstract

An aluminum-based electrically conductive material (10) produced by subjecting an aged aluminum-scandium-based alloy to a processing treatment so as to impart an equivalent strain of 4 or more to the alloy and then removing the remaining strain from the resultant product. The aluminum-based electrically conductive material (10) is composed of a metallic structure which comprises crystal grains (11) of aluminum or an aluminum-based alloy having an average grain diameter of 2 μm or less and aluminum-scandium-based nano-precipitates (13) having an average grain diameter of 1 to 60 nm inclusive and existing on grain boundaries (12) of the crystal grains (11) in an amount of 0.1 to 1 mass% inclusive, has a Vickers hardness of 50 to 70 inclusive, and also has fatigue strength of at least 180 MPa when the aluminum-based electrically conductive material (10) is bent repeatedly 10⁶ times in a fatigue test in which repeated bending is loaded to the aluminum-based electrically conductive material (10). Thus, it becomes possible to provide: an aluminum-based electrically conductive material which can be used in the wiring of a driving part of each of robots and various devices; and a cable manufactured using the aluminum-based electrically conductive material.

Description

Aluminum-based conductive material and cable using the same

The present invention provides, for example, an aluminum-based conductive material having bending resistance used for wiring that repeatedly undergoes bending deformation of a drive portion or the like in wiring for industrial robots, consumer robots, or various devices, and the like. Related to the cable.

A driving part of an industrial robot or a consumer robot, for example, a cable used for wiring an arm part, is repeatedly subjected to bending when the arm is driven. Further, the cable used for wiring the door portion of the automobile is repeatedly bent when the door is opened and closed. For this reason, not a normal conducting wire but a conducting wire excellent in bending resistance is used for a cable subjected to repeated bending. Further, when the conducting wire is thinned, the bending resistance is improved even with the same material. Therefore, the conducting wire used for the cable is not a single wire but a twisted wire composed of a plurality of fine wires.

For example, in Patent Document 1, iron is used as a conductive wire having a number of breaks (fatigue life) of 50,000 times or more when repeated bending with a strain amplitude of ± 0.15% at room temperature is applied. 4% by mass, copper 0.1-0.3% by mass, magnesium 0.02-0.2% by mass, silicon 0.02-0.2% by mass, titanium and vanadium together 0.001- An aluminum alloy wire containing 0.01% by mass and having a crystal grain size of 5 to 25 μm in a vertical cross section in the wire drawing direction is disclosed.

For example, Patent Document 2 discloses an aluminum alloy containing scandium in an amount of 0.1 to 0.3% by mass (weight%) as an aluminum-based conductive material that is lightweight and has excellent heat resistance, tensile strength, and conductivity. It is disclosed.
Furthermore, as an example of further improving the heat resistance of an aluminum alloy containing scandium, Patent Document 3 discloses that zirconium is 0.1 to 0.5 mass% and scandium is 0.05 to 0.5 mass%. An aluminum alloy that is manufactured by performing cold working after heat treatment includes Patent Document 4 containing 0.1 to 0.4% by mass of zirconium and 0.05 to 0.3% by mass of scandium. An aluminum alloy manufactured by heat treatment is disclosed in Patent Document 5, which contains 0.1 to 0.5 mass% of zirconium and 0.05 to 0.5 mass% of scandium, and is subjected to cold working after the heat treatment. Patent Document 6 discloses that an aluminum alloy containing 0.1 to 0.5% by mass of zirconium and 0.05 to 0.5% by mass of scandium is subjected to a heat treatment after cold working, and then cold-worked again. Aluminum alloy production performed is disclosed, respectively.

JP 2010-163675 A JP 7-316705 A JP 2001-131719 A JP 2001-348637 A JP 2002-266043 A JP 2002-302727 A

The aluminum alloy wire described in Patent Document 1 has a fatigue life of 50,000 times or more, and assuming that an actual robot requires 2 seconds for one bending operation, the total number of bendings for two days is 86400 times. Thus, the number of flexing times exceeds the minimum life. For this reason, when the cable produced using the strand formed from the aluminum alloy wire described in Patent Document 1 is applied as a robot cable, there is a problem that the robot cannot be stably operated for a long period of time. is there.

On the other hand, for example, a strand having a wire diameter of 80 μm is formed from an aluminum alloy containing scandium described in Patent Documents 2 to 5, and a cable having a cross-sectional area of 0.2 mm ² is produced using the strand. When a dynamic drive test (for example, a left / right bending (left / right repeated bending) test in which a bending radius is 15 mm and a bending angle range is ± 90 degrees in a state where a load of 100 g is applied to the test body) is performed, the number of times the cable is broken Is 3 to 4 million times (depending on the composition of the aluminum alloy and the manufacturing process of the wire). For this reason, even if a cable produced using an aluminum alloy described in Patent Documents 2 to 5 is used as a robot cable, it is not sufficient to stably operate the robot for a long period of time.

In Patent Documents 2 to 5, when an aluminum alloy is cold-worked (plastic working) and heat-treated to form a wire, the fine structure formed by cold-working constitutes a fine structure during heat-treatment. Since grain growth occurs in the crystal grains, there is a problem that the tensile strength of the wire decreases with the progress of grain growth. Further, when non-uniformity occurs in the structure constituting the wire due to the grain growth, the cable manufactured using this wire has a problem that the number of breaks in the bending test is reduced and the variation in the number of breaks is increased. . Further, in Patent Documents 3, 5, and 6, when a wire is formed by cold working an aluminum alloy, strains during cold working are accumulated in the wire, so the hardness and tensile strength of the wire are increased. However, the extensibility of the wire is decreasing. For this reason, there is a problem that the frequency of disconnection of the wire at the time of cable manufacture increases and the manufacturing yield decreases. Moreover, strain remains in the wire used for the cable and the extensibility is lowered. Therefore, when this cable is actually used, there arises a problem that the bending resistance is lowered.

The present invention has been made in view of such circumstances, and is intended to improve the tensile strength, the bending resistance, and the extensibility while miniaturizing the structure and reducing the residual strain, and to improve the driving part of the robot or various devices. It is an object to provide an aluminum-based conductive material that can be used for wiring and a cable using the same.

The aluminum-based conductive material according to the first invention that meets the above-mentioned object is to remove the remaining strain after subjecting an aged aluminum-scandium alloy to a process in which the equivalent strain is rounded off to 4 or more. An aluminum-based conductive material obtained by
Aluminum or aluminum-based alloy crystal grains having an average grain diameter of 2 μm or less, and aluminum having an average grain diameter of 1 nm to 60 nm and present at 0.1 to 1 mass% at the grain boundaries of the crystal grains— It is composed of a metal structure having scandium-based nanoprecipitates,
Vickers hardness is a 50 or more 70 or less, the fatigue strength when the repeat count 10 ⁶ times in fatigue test to load the repeated bending of at least 180 MPa.
In the present invention, the aluminum-scandium-based nanoprecipitate is precipitated (dispersed) at the grain boundaries of the crystal grains constituting the metal structure of the aluminum-scandium-based alloy, and then deformed (processed). Dislocations accumulated in the crystal grains of an aluminum-scandium alloy due to the introduction of strain during the formation of grain boundaries through the formation of subgrain boundaries while being pinned by nanoprecipitates (recrystallization process) Is used to produce a metal structure composed of crystal grains having an average grain size of 2 μm or less. Here, the processing applied to the aluminum-scandium alloy is 4 or more in terms of equivalent strain. When the equivalent strain is less than 4, there are few dislocations accumulated in the crystal grains, a sufficient subgrain boundary is not formed, and a metal structure composed of crystal grains having an average grain size of 2 μm or less cannot be obtained. It is. On the other hand, when a grain boundary is gradually formed through a sub-grain boundary, the grain boundary acts as an absorption source of dislocations. Within the grains, the generation and absorption of dislocations are balanced. As a result of processing the aluminum-scandium-based alloy and observing the metal structure obtained at that time, the crystal grains constituting the metal structure are increasingly refined as the processing is performed until the equivalent strain reaches about 10. However, even when processing with an equivalent strain exceeding 10 was applied, no significant progress of crystal grain refinement was observed. Therefore, from the viewpoint of economy, the upper limit of processing applied to the aluminum-scandium alloy is set to an equivalent strain of 10.
When processing (main processing) in which the equivalent strain is 4 or more and 10 or less, the shape of the aluminum-scandium alloy may be prepared in advance by plastic processing such as rolling so that the main processing can be easily performed. Good. When plastic processing is performed to adjust the shape, heat treatment is performed at a heat treatment temperature that is 30 to 70% of the melting point of the aluminum-scandium alloy before the main processing, and strain (accumulation accumulated during the plastic processing) is accumulated. It is preferable to improve the workability in the main processing by removing the dislocations) and making the crystal grains of the aluminum-scandium alloy crystal equiaxed (fine granular crystals).
In the aluminum-scandium alloy after this processing, the strain introduced into the crystal grains is removed during the recrystallization (crystal grain refinement) process, but part of the introduced strain is crystallized after refinement. It remains in the grains. For this reason, the residual strain is removed by heat-treating the aluminum-scandium alloy after the main processing at a temperature lower than the recrystallization temperature. In the aluminum-scandium alloy after this processing, the grain boundary angle is increased in the process of removing the residual strain from the crystal grains (for example, the average grain boundary angle is 15 degrees or more and 30 degrees or less), and the strain is increased. Since (accumulated dislocations) are easily absorbed by the grain boundaries, even if strain is introduced into the crystal grains of the aluminum-scandium alloy after this processing (dislocations are accumulated), the strain (dislocations) is crystallized. Accumulation in the grains is suppressed. As a result, even if the aluminum-scandium alloy is repeatedly bent, for example, it is possible to prevent a decrease in strength (fatigue strength). Here, since the relationship that the Vickers hardness increases with increasing strain in the crystal grains is generally established, in the aluminum-scandium alloy, aluminum-scandium nanoprecipitates having an average particle diameter of 1 to 60 nm are averaged. If the range of the Vickers hardness of the metal structure existing in the grain boundary of the crystal grain having a grain size of 2 μm or less is determined in advance, the aluminum-scandium alloy after the main processing is performed so that the Vickers hardness becomes a value within the predetermined range. By performing heat treatment (conditions are defined by temperature and time), residual strain in the crystal grains can be removed while preventing crystal grain growth.

In the aluminum-based conductive material according to the first invention, it is preferable that the crystal grains are the aluminum-based alloy, and the aluminum-based alloy contains 0.1% by mass or more and 0.2% by mass or less of zirconium.

In the aluminum-based conductive material according to the first invention, the metal structure preferably includes 15% or more of the crystal grains having a cross-sectional area ratio of 1 μm or less.
In addition, when the crystal structure of 1 μm or less is included in the metal structure at 20% or more in terms of the cross-sectional area ratio, it can withstand a dynamic drive test (that is, not break) at least 10 million times of repeated bending. .

The cable according to the second invention that meets the above object uses the aluminum-based conductive material according to the first invention for the conductor wire, and the wire diameter of the conductor wire is 0.05 mm or more and 0.5 mm or less. .
The cable can be used as a robot cable, a connector cable for a quick charging stand machine, a cabtyre cable, a bus bar cable, or an in-device wiring cable.
The cable can also be used for an automobile cable, an aircraft cable, a rocket cable, or a satellite cable.

The aluminum-based conductive material according to the first invention is obtained by subjecting an aged aluminum-scandium-based alloy to a process in which the equivalent strain is 4 or more, and crystal grains of aluminum or an aluminum-based alloy having an average grain size of 2 μm or less, Comprising an aluminum-scandium-based nanoprecipitate having an average particle size of 1 nm or more and 60 nm or less and existing at a grain boundary of 0.1% by mass or more and 1% by mass or less; By adjusting the Vickers hardness of the metal structure to be 50 or more and 70 or less, the grain growth of the formed metal structure is prevented (maintaining that the average grain size of the crystal grains is 2 μm or less), The strain existing in the crystal grains can be removed, and the extensibility can be improved. For this reason, bending is repeatedly added to the metal structure, and strain is hardly accumulated in the metal structure.

Here, since the average grain size of the crystal grains constituting the metal structure is 2 μm or less, even if a crack occurs, the crack frequently collides with the crystal grain when propagating, and the crack is deflected. The branching of the crack is promoted, and the speed at which the crack propagates in one direction decreases. In addition, since the mismatch between the crystal grains and the nanoprecipitate is small, the tip of the generated crack can be pinned effectively by the nanoprecipitate, and the crack growth is stopped or the crack growth rate is reduced. Is further promoted. Thus, repeated bending can be at least a fatigue strength when the repeat count 10 ⁶ times 180MPa in fatigue test to load, for example, can be guaranteed to withstand higher dynamic drive 10 million times. As a result, the aluminum-based conductive material can be used in the wiring of robots or various devices, particularly in the wiring of parts that require bending resistance, such as the drive portion.

In the aluminum-based conductive material according to the first invention, when the aluminum-based alloy contains zirconium in an amount of 0.1% by mass or more and 0.2% by mass or less, the zirconium is present in the crystal grains and in the grain boundaries, and the aluminum-based conductive material Even if it receives a high temperature heat history, the fall of tensile strength can be prevented. Here, if the zirconium content is less than 0.1% by mass, the tensile strength cannot be prevented from being lowered, and if the zirconium content exceeds 0.2% by mass, the conductivity decreases, which is not preferable.

In the aluminum-based conductive material according to the first aspect of the present invention, if the metal structure contains crystal grains of 1 μm or less in a cross-sectional area ratio of 15% or more, fatigue cracks propagate in the metal structure of the aluminum-based conductive material. In this case, the frequency of collisions with the crystal grains is improved, deflection of fatigue cracks and crack branching can be promoted, the resistance associated with the growth of fatigue cracks increases, and the fatigue crack growth rate decreases. Can be made.
In addition, when the metal structure contains crystal grains of 1 μm or less in a cross-sectional area ratio of 20% or more, when the generated crack propagates in the metal structure, the collision frequency with the crystal grains is further improved, Crack deflection and crack branching can be further promoted. As a result, the resistance accompanying the crack growth is further increased, the crack growth speed can be further reduced, and it is possible to withstand at least 10 million dynamic drive tests.

In the cable according to the second invention, the aluminum-based conductive material according to the first invention is used for the conductor wire, and the wire diameter of the conductor wire is 0.05 mm or more and 0.5 mm or less. The strain generated in the conductor wire when bending is applied can be reduced, and a cable having bending resistance can be easily manufactured. Thereby, early disconnection at the time of cable use can be prevented, the reliability of various apparatuses using this cable can be improved, and the maintenance burden of various apparatuses can be reduced.

In the cable according to the second aspect of the invention, when the cable is used for a robot cable, the cable is lightweight because it is made of an aluminum-based conductive material, so that drivability, operability, and workability can be improved.
Moreover, when using a cable for the connector cable of a quick-charging stand machine, a connector cable becomes lightweight and can improve operativity.
Furthermore, when the cable is used as a cab tire cable, for example, a cab tire cable of an electric welding machine, even if the cab tire cable becomes light and the cab tire cable becomes long when a large structure is manufactured. The cabtire cable can be moved relatively easily, and the workability of welding can be improved.
And when the cable is used as a busbar cable or an in-device wiring cable and when the cable is used as an automobile cable, an aircraft cable, a rocket cable, or a satellite cable, the workability is improved because the cable is lightweight. In addition, the weight of the device and the wiring target can be reduced.

It is explanatory drawing of the structure | tissue of the aluminum group electrically-conductive material which concerns on the 1st Example of this invention. It is explanatory drawing of the structure | tissue of the aluminum group electrically-conductive material which concerns on the 2nd Example of this invention.

Subsequently, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIG. 1, the aluminum-based conductive material 10 according to the first embodiment of the present invention has a residual strain after an aging-treated aluminum-scandium alloy is processed to have an equivalent strain of 4 or more. The aluminum crystal grains 11 having an average grain diameter of 2 μm or less obtained by the removal, and the average grain diameter of 1 nm to 60 nm, and 0.1 to 1 mass% at the grain boundary 12 of the crystal grains 11 And a Vickers hardness of 50 or more and 70 or less, and a fatigue strength at the time of 10 ⁶ repetitions in a fatigue test in which repeated bending is applied. 180 MPa. Details will be described below.

By aging the aluminum-scandium alloy, scandium and aluminum in the aluminum-scandium alloy react to produce Al ₃ Sc, an aluminum-scandium-based intermetallic compound, as nanoprecipitates 13. The nanoprecipitates 13 exist at the grain boundaries of the aluminum crystal grains. Here, the amount of scandium in the aluminum-scandium alloy is adjusted in advance so that the nanoprecipitate 13 is generated in an amount of 0.1% by mass to 1% by mass.

Then, when the aluminum-scandium alloy in which the nanoprecipitates 13 are formed is subjected to processing with an equivalent strain of 4 or more, dislocations are accumulated in the aluminum crystal grains, and after the formation of subgrain boundaries, Refinement occurs, and crystal grains 11 having an average grain size of 2 μm or less are formed. Here, since the mismatch of the lattice constant between the nanoprecipitates 13 and the crystal grains existing in the grain boundaries of the aluminum crystal grains after the aging treatment is small, the coarsening of the nanoprecipitates 13 is suppressed and the nanoprecipitates are reduced. 13 is dispersed in the grain boundaries of the aluminum crystal grains. For this reason, when a crystal grain is refined by applying a process with an equivalent strain of 4 or more, abnormal grain growth of the crystal grain is suppressed, and an aluminum-scandium alloy is made of aluminum having an average grain size of 2 μm or less. A metal structure having crystal grains 11 and nanoprecipitates 13 having an average grain diameter of 1 nm or more and 60 nm or less and existing in a grain boundary 12 of the crystal grains 11 by 0.1 mass% or more and 1 mass% or less is obtained.

The dislocations introduced into the crystal grains when processing with an equivalent strain of 4 or more occurs at the grain boundaries of the crystal grains in the process of making the crystal grains fine and forming the crystal grains 11 having an average grain size of 2 μm or less. Although absorbed, some of the dislocations introduced during processing remain in the crystal grains 11 having an average grain size of 2 μm or less, and strain exists in the crystal grains 11. For this reason, the Vickers hardness of the metal structure immediately after refinement is higher than the original value predicted from the composition of the aluminum-scandium alloy, and the elongation (deformability) of the aluminum-scandium alloy after processing ) Is falling.

Here, for example, if the aluminum-scandium alloy after processing is subjected to a heat treatment to remove strain remaining in the crystal grains, the elongation of the aluminum-scandium alloy can be recovered. Since grain growth occurs in 11, the tensile strength and bending resistance are greatly reduced. Therefore, if the heat treatment conditions are set so that the processed aluminum-scandium alloy has a Vickers hardness of 50 or more and 70 or less, the growth of the crystal grains 11 is suppressed and the dislocations existing in the crystal grains 11 are absorbed by the grain boundaries. Thus, the strain remaining in the crystal grains 11 can be removed. As a result, the stretchability (deformability) of the aluminum-scandium alloy after processing can be recovered.

As the dislocation is absorbed at the grain boundary, the grain boundary angle increases, and for example, the average grain boundary angle becomes 15 degrees or more and 30 degrees or less. For this reason, the dislocations introduced into the crystal grains 11 in the fatigue test in which repeated bending is applied are easily absorbed by the grain boundaries because the grain boundaries are highly angled, and the accumulation of strain in the crystal grains is suppressed. The

As described above, the metal structure formed by subjecting the aluminum-scandium-based alloy in which the nanoprecipitate 13 has been produced to a processing with an equivalent strain of 4 or more (the aluminum crystal grains 11 having an average grain diameter of 2 μm or less, the average By repeatedly heat-treating the metal structure having a grain size of 1 nm or more and 60 nm or less and having nanoprecipitates 13 present at the grain boundaries of the crystal grains 11 to remove strain remaining in the crystal grains 11, repeated bending It is possible to suppress the occurrence of fatigue cracks in the metal structure when a load is applied.

Even if a fatigue crack occurs in the metal structure, the fatigue crack frequently collides with the crystal grain 11 when propagating in the metal structure having the crystal grain 11 having an average grain size of 2 μm or less, and fatigue occurs. When the crack is deflected, crack branching is promoted, the speed at which the fatigue crack propagates in one direction decreases, and when the fatigue crack collides with the nanoprecipitate 13, the fatigue crack becomes a nanoprecipitate 13. Therefore, the fatigue crack growth rate is further reduced.

Here, when the average grain size of the crystal grains 11 is controlled to 2 μm, the metal structure is composed of crystal grains 11 having a maximum grain size of 4 μm, and the number of repetitions in the fatigue test is 10 ⁶ times. The fatigue strength of can be 180 MPa. The average grain size of the crystal grains 11 can be 1.6 μm by including 15% or less of the crystal grains 11 of 1 μm or less in the metal structure. The fatigue strength at the ^6th time can be 190 MPa. In addition, by making 20% of the crystal grains 11 of 1 μm or less in the metal structure in a cross-sectional area ratio, the average grain size of the crystal grains 11 can be 1.5 μm, and the number of repetitions in the fatigue test is 10 The fatigue strength at the ^sixth time can be 200 MPa. Furthermore, by making 50% of the crystal grains 11 of 1 μm or less in a cross-sectional area ratio, the average grain diameter of the crystal grains 11 can be 1.2 μm, and the number of repetitions in the fatigue test is 10 ⁶ times. The fatigue strength can be 220 MPa.
Therefore, it is preferable that the crystal structure 11 of 1 μm or less is included in the metal structure by 15% or more (preferably 20% or more) in terms of the cross-sectional area.

By causing the nanoprecipitate 13 to exist in an amount of 0.1% by mass or more and 1% by mass or less, it is possible to achieve a crack pinning effect while suppressing a decrease in conductivity of the aluminum-based conductive material 10. Here, if the nanoprecipitate 13 is less than 0.1% by mass, the nanoprecipitate 13 is reduced, and the pinning effect of cracks is reduced. If the nanoprecipitate 13 exceeds 1.0% by mass, Although the nanoprecipitate 13 present in the boundary increases and the pinning effect of the fatigue crack is improved, it is not preferable because the conductivity is lowered. Therefore, the content of the nanoprecipitate 13 is set in the range of 0.1 to 1.0% by mass.

Since the total amount of the nanoprecipitates 13 is determined by the content of scandium in the aluminum-scandium-based alloy, the particle size of the nanoprecipitates 13 decreases as the number of nanoprecipitates 13 increases. When the number decreases, the particle size of the nanoprecipitate 13 increases. On the other hand, when the fatigue crack generated in the metal structure propagates, the effect of the fatigue crack being pinned by the nanoprecipitate 13 is that as the number of nanoprecipitates 13 increases, the particle size of the nanoprecipitate 13 increases. It increases as becomes larger.

Here, if the average particle size of the nanoprecipitates 13 is less than 1 nm, the number of nanoprecipitates 13 increases and the frequency of occurrence of pinning of fatigue cracks increases. The action is not large and the pinning effect of fatigue cracks is not significant. On the other hand, if the average particle size of the nanoprecipitates 13 exceeds 60 nm, the fatigue crack pinning effect by the nanoprecipitates 13 increases, but the number of nanoprecipitates 13 decreases and fatigue crack pinning occurs. The frequency of cracks decreases and the pinning effect of fatigue cracks is not significant. For this reason, when the total amount of the nanoprecipitates 13 is constant, the nanoprecipitates 13 are maintained at a high frequency while pinching of fatigue cracks is maintained at a high level by setting the average particle size of the nanoprecipitates 13 to 60 nm. The pinning action of the fatigue crack due to the can also be maintained at a high level, and the pinning effect of the fatigue crack due to the nanoprecipitate 13 can be improved.

In addition, when the processed aluminum-scandium alloy is heat-treated, when the Vickers hardness after the heat treatment exceeds 70, strain is not sufficiently removed, and the elongation of the metal structure is based on the composition of the aluminum-scandium alloy. It does not recover to the expected original value. In addition, the grain boundary angle cannot be increased. On the other hand, when the Vickers hardness after the heat treatment is less than 50, the strain is sufficiently removed and the elongation of the metal structure is restored to the original value predicted from the composition of the aluminum-scandium alloy. At the same time, the growth of crystal grains 11 occurs, and the tensile strength and the bending resistance are greatly reduced.

Next, a method for manufacturing a conductor wire made of the aluminum-based conductive material 10 will be described.
A conductive material block made of an aluminum-scandium alloy containing 0.27 to 0.32% by mass of scandium is cast using aluminum having a purity of 99.9% by mass or more and scandium having a purity of 99% by mass or more. To do. Next, an aging treatment is performed at 250 to 450 ° C. for 0.5 to 30 hours, and a rod having a diameter of, for example, 10 mm is manufactured by cutting from the conductive material block after the aging treatment.

By aging the aluminum-scandium-based alloy, scandium and aluminum in the aluminum-scandium-based alloy react with each other, and Al ₃ Sc, which is an aluminum-scandium-based intermetallic compound, forms nanoprecipitates 13 as aluminum crystals. Generated at grain boundaries. In addition, from the investigation of the nanoprecipitate 13 present in the metal structure, it was confirmed that almost all of the added scandium reacted with aluminum to produce Al ₃ Sc.
Here, the average particle diameter of the nanoprecipitate can be set in the range of 1 nm to 60 nm by adjusting the conditions of the aging treatment (heating temperature and heating time). For example, when the heating temperature is 350 ° C. and the heating time is 0.1 hour, the maximum particle size of the nanoprecipitate 13 is 3 nm and the average particle size is 1 nm. When the heating temperature is 350 ° C. and the heating time is 3 hours, the maximum particle size of the nanoprecipitate 13 is 10 nm, and the average particle size is 5 nm. Furthermore, when the heating temperature is 350 ° C. and the heating time is 40 hours, the maximum particle size of the nanoprecipitate 13 is 100 nm and the average particle size is 60 nm.

Next, the wire is formed by rolling the rod using a swaging machine so that the outer diameter is, for example, about 1.5 to 2 mm. Then, wire drawing of the wire is performed to form an original conductor strand having a wire diameter of 0.05 mm or more and 0.5 mm or less. Here, after the degree of work (corresponding strain) in forming the wire by rolling the rod is set to 3 to 4, a heat treatment for promoting equiaxed crystal formation (for example, the heat treatment temperature is 30 to 70 of the melting point of the rod). %), And then, an original conductor wire is formed from the wire by die drawing. Here, by setting the degree of processing (equivalent strain) when forming the original conductor wire to, for example, 4 to 6, preferably 5 to 6, the average grain size of the crystal grains 11 constituting the metal structure is 2 μm. It becomes. Note that the presence of the nanoprecipitates 13 at the grain boundaries of the crystal grains constituting the metal structure of the wire causes recrystallization to occur in the metal structure constituting the wire as a result of processing. Is formed, grain growth is suppressed, and it becomes easy to make the average grain size of the crystal grains 11 be 2 μm or less.

Note that the crystal grain 11 constituting the metal structure is formed by setting the processing degree of forming the wire from the rod to 3 to 4 and the processing degree of the die drawing process to 4 to 6.5, preferably 6 to 6.5. The average grain size of 1.6 μm and the ratio of crystal grains 11 of 1 μm or less is 15% in terms of the cross-sectional area, and the degree of processing to form a wire from a rod is 3 to 4, and the degree of processing of die wire drawing Is set to 4 to 7, preferably 6.5 to 7, the average grain size of the crystal grains 11 constituting the metal structure is 1.5 μm, and the ratio of the crystal grains 11 of 1 μm or less is the cross-sectional area ratio. 20%. In addition, the degree of processing for forming a wire from a rod is 3 to 4, and the degree of processing for die drawing is 5 to 8 (or 9), preferably more than 7 and 8 or less. The average particle size of the grains 11 is 1.2 μm, and the ratio of the crystal grains 11 of 1 μm or less is 50% in terms of the cross-sectional area.

Subsequently, a heat treatment is performed on the original conductor wire to remove strain remaining in the crystal grains 11 constituting the metal structure of the original conductor wire, thereby obtaining a conductor wire. The temperature of the heat treatment is a temperature lower than the recrystallization temperature of the crystal grains 11 constituting the metal structure of the original conductor wire. For example, when the processing degree when forming the original conductor wire is 4 to 6 and the average grain size of the crystal grains 11 constituting the metal structure is 2 μm, the Vickers of the metal structure forming the original conductor wire The hardness is 72 to 80. In order to reduce the Vickers hardness to 50 to 70, the heat treatment temperature is set to 250 to 350 ° C., and the treatment time is set to 0.1 to 3 hours.

In addition, the degree of processing at the time of forming the original conductor wire is 4 to 6.5, and the existing ratio of the crystal grains 11 constituting the metal structure is 1 μm or less in terms of a cross-sectional area ratio of 15% (the average grain diameter of the crystal grains 11). 1.6 μm), the Vickers hardness of the metal structure forming the original conductor wire is 72 to 80. To reduce the Vickers hardness to 50 to 70, the heat treatment temperature is 250 to 350 ° C. Set the treatment time to 0.1-3 hours. Furthermore, when the degree of processing at the time of forming the original conductor wire is 4 to 7, the existing ratio of 1 μm or less is 20% in terms of the cross-sectional area ratio (the average particle diameter of the crystal grains 11 is 1.5 μm). The Vickers hardness of the metal structure forming the strand is 72 to 85. In order to reduce the Vickers hardness to 50 to 70, the heat treatment temperature is set to 250 to 350 ° C. and the treatment time is set to 0.1 to 3 hours. To do. When the degree of processing when forming the original conductor wire is 5 to 8, and the existing ratio of 1 μm or less is 50% in terms of the cross-sectional area ratio (the average particle diameter of the crystal grains 11 is 1.2 μm), the original conductor The Vickers hardness of the metal structure forming the strand is 72 to 90. To reduce the Vickers hardness to 50 to 70, the heat treatment temperature is set to 250 to 350 ° C. and the treatment time is set to 0.1 to 3 hours. To do.

A cable made of an aluminum-based conductive material 10 according to the first embodiment of the present invention and using a conductor wire having a conductor wire diameter of 0.05 mm or more and 0.5 mm or less is used as a robot cable. By using it for the wiring of the driving part of the machine or by using it for the elevator lifting part as an in-apparatus wiring cable, it is possible to reduce the strain generated in the conductor wire even when the cable is repeatedly bent. It is possible to prevent early disconnection of the conductor wire (cable). As a result, in addition to the light weight and high flexibility that are the characteristics of the aluminum-based conductive material, high durability (prevention of early cable breakage) can be achieved, and the apparatus can be stably operated over a long period of time. Thus, the reliability of the apparatus can be improved and the maintenance burden can be reduced.

As shown in FIG. 2, the aluminum-based conductive material 14 according to the second embodiment of the present invention remains after an aging-treated aluminum-zirconium-scandium alloy is processed to have an equivalent strain of 4 or more. Obtained by removing the strain, the crystal grain 15 of the aluminum-based alloy having an average grain size of 2 μm or less, and the average grain size of 1 nm or more and 60 nm or less, and 0.1 mass% or more at the grain boundary 16 of the crystal grain 15 It is composed of a metal structure having aluminum-scandium-based nanoprecipitates 17 present in an amount of 1% by mass or less, having a Vickers hardness of 50 or more and 70 or less, and a repetition number of 10 ⁶ times in a fatigue test in which repeated bending is applied. The fatigue strength is at least 180 MPa. Details will be described below.

By aging the aluminum-zirconium-scandium alloy, scandium and aluminum in the aluminum-zirconium-scandium alloy react to form Al ₃ Sc, which is an aluminum-scandium intermetallic compound, as nanoprecipitates 17. The generated nanoprecipitates 17 are present at the grain boundaries of the crystal grains of the aluminum-based alloy. Here, the amount of scandium in the aluminum-zirconium-scandium-based alloy is adjusted in advance so that the nanoprecipitate 17 is generated in an amount of 0.1 mass% to 1 mass%. A part of zirconium is dissolved in the crystal grains of the aluminum-based alloy, and the rest is present at the grain boundaries.

Then, when the aluminum-zirconium-scandium alloy in which the nanoprecipitates 17 are formed is subjected to processing with an equivalent strain of 4 or more, dislocations are accumulated in the crystal grains of the aluminum-based alloy, thereby forming subgrain boundaries. As a result, crystal grains are refined, and crystal grains 15 having an average grain size of 2 μm or less are formed. Here, since the mismatch of the lattice constant between the nanoprecipitate 17 and the crystal grain existing in the grain boundary of the aluminum-based alloy after the aging treatment is small, the coarsening of the nanoprecipitate 17 is suppressed, The precipitates 17 are dispersed at the grain boundaries of the aluminum-based alloy crystal grains. For this reason, when the crystal grains are refined by applying a process with an equivalent strain of 4 or more, abnormal grain growth of the crystal grains is suppressed, and the aluminum-zirconium-scandium alloy has an average grain size of 2 μm or less. A metal structure having crystal grains 15 of the aluminum-based alloy and nanoprecipitates 17 having an average grain diameter of 1 nm or more and 60 nm or less and existing at the grain boundaries 16 of the crystal grains 15 is obtained. A part of zirconium is dissolved in the crystal grains 15, and the remaining part is present at the grain boundaries 16.

The dislocations introduced into the crystal grains of the aluminum-based alloy when processing with an equivalent strain of 4 or more occurs during the process in which the crystal grains are refined to form crystal grains 15 having an average grain size of 2 μm or less. However, some of the dislocations introduced during processing remain in the crystal grains 15 having an average grain size of 2 μm or less, and strain exists in the crystal grains 15. For this reason, the Vickers hardness of the metal structure immediately after refinement is higher than the original value predicted from the composition of the aluminum-zirconium-scandium alloy, and the elongation of the aluminum-zirconium-scandium alloy after processing The property (deformability) is reduced.

Here, if the strain remaining in the crystal grains is removed by performing, for example, heat treatment on the processed aluminum-zirconium-scandium alloy, the extensibility of the aluminum-zirconium-scandium alloy can be recovered. Since grain growth occurs in the crystal grains 15 by the heat treatment, the tensile strength and the bending resistance are greatly lowered. Therefore, if the heat treatment conditions are set so that the processed aluminum-zirconium scandium alloy has a Vickers hardness of 50 or more and 70 or less, the growth of the crystal grains 15 is suppressed, and the dislocations existing in the crystal grains 15 are separated from the grain boundaries. Thus, the strain remaining in the crystal grains 15 can be removed. As a result, the elongation (deformability) of the processed aluminum-zirconium-scandium alloy can be recovered.

As the dislocation is absorbed at the grain boundary 16, the grain boundary angle is increased, and for example, the average grain boundary angle is 15 degrees or more and 30 degrees or less. For this reason, dislocations introduced into the crystal grains 15 in a fatigue test in which repeated bending is applied are easily absorbed by the grain boundaries 16 because the grain boundaries 16 are angled, and strain is accumulated in the crystal grains 15. Is suppressed.

Metal structure formed by subjecting the aluminum-zirconium-scandium alloy produced with nanoprecipitates 17 to processing with an equivalent strain of 4 or more (crystal grains 15 of an aluminum-based alloy having an average grain size of 2 μm or less, and average grains) The metal structure having a diameter of 1 nm to 60 nm and having nanoprecipitates 17 present at the grain boundaries 16 of the crystal grains 15 is heat-treated to remove strain remaining in the crystal grains 15, thereby repeatedly bending It is possible to suppress the occurrence of fatigue cracks in the metal structure when a load is applied. Even if a fatigue crack occurs in the metal structure, the fatigue crack frequently collides with the crystal grains 15 when propagating in the metal structure having the crystal grains 15 having an average grain size of 2 μm or less, and fatigue occurs. When the crack is deflected, crack branching is promoted, the speed at which the fatigue crack propagates in one direction is reduced, and when the fatigue crack collides with the nanoprecipitate 17, the fatigue crack becomes a nanoprecipitate 17. Therefore, the fatigue crack growth rate is further reduced.

Here, when the average grain size of the crystal grains 15 is controlled to 2 μm, the metal structure is composed of the crystal grains 15 having a maximum grain size of 4 μm from the microscopic observation of the metal structure, and the number of repetitions in the fatigue test is 10 ⁶ times. The fatigue strength of can be 180 MPa. The average grain size of the crystal grains 11 can be 1.6 μm by including 15% of the crystal grains 15 of 1 μm or less in the metal structure in terms of the cross-sectional area ratio, and the number of repetitions in the fatigue test is 10 The fatigue strength at the ^6th time can be 190 MPa. Further, by making 20% of the crystal grains 15 of 1 μm or less in the metal structure in terms of the cross-sectional area ratio, the average grain size of the crystal grains 15 can be made 1.5 μm, and the number of repetitions in the fatigue test is 10 The fatigue strength at the ^sixth time can be 200 MPa. Furthermore, by making the crystal grains 15 of 1 μm or less contain 50% in terms of the cross-sectional area ratio, the average grain size of the crystal grains 15 can be 1.2 μm, and the number of repetitions in the fatigue test is 10 ⁶ times. The fatigue strength can be 220 MPa.

In the aluminum-based conductive material 14, an aged aluminum-zirconium-scandium-based alloy is processed to have an equivalent strain of 4 or more, and the aluminum-based alloy crystal grains 15 having an average grain size of 2 μm or less and an average grain size of A metal structure having an aluminum-scandium-based nanoprecipitate 17 present at the grain boundary 16 of the crystal grain 15 and having a heat treatment so that the Vickers hardness is 50 or more and 70 or less. Since the effect by removing the remaining distortion is the same as the effect in the aluminum-based conductive material 10 according to the first embodiment, the description is omitted. Hereafter, the effect regarding containing 0.1 mass% or more and 0.2 mass% or less of zirconium which is the characteristics of the aluminum-based conductive material 14 according to the second embodiment will be described.

For example, the tensile strength σ _{RT at} room temperature of a wire having a metal structure in which 0.3 mass% of aluminum-scandium nanoprecipitates exist at the grain boundaries of aluminum crystal grains is 300 MPa. The tensile strength σ ₂₆₀ immediately after the time heating is 294 MPa, and when the heat resistance is evaluated by (σ ₂₆₀ / σ _RT ) × 100, the heat resistance is 98%. On the other hand, a tensile strength σ _{RT at} room temperature of a wire having a metal structure in which 0.3 mass% of aluminum-scandium-based nanoprecipitates are present at the grain boundaries of an aluminum-based alloy in which 0.01 mass% of zirconium is dissolved. Is 300 MPa, and the tensile strength σ ₂₆₀ immediately after heating this wire at 260 ° C. for 1 hour is 294 MPa, and the heat resistance is 98%. Also, tensile strength at room temperature σ _RT of a wire having a metal structure in which 0.3 mass% of aluminum-scandium-based nanoprecipitates are present at the grain boundaries of an aluminum-based alloy in which 0.05 mass% of zirconium is dissolved. Is 305 MPa. Immediately after heating the wire at 260 ° C. for 1 hour, the tensile strength σ ₂₆₀ is 303 MPa, and the heat resistance is 99%. Furthermore, the tensile strength σ _{RT at} room temperature of a wire having a metal structure in which 0.3 mass% of aluminum-scandium-based nanoprecipitates are present at the grain boundaries of an aluminum-based alloy in which 0.1 mass of zirconium is dissolved is The tensile strength σ ₂₆₀ immediately after heating the wire at 260 ° C. for 1 hour is 309 MPa, and the heat resistance is 100%.

As described above, the presence of zirconium in the crystal grains 15 constituting the metal structure of the aluminum-based conductive material 14 and in the grain boundaries 16 allows the aluminum-based conductive material 14 to receive a high-temperature thermal history. It can be seen that structural changes such as grain growth can be prevented, and a decrease in tensile strength can be prevented. Here, when the solid solution amount (content) of zirconium exceeds 0.2% by mass, the effect of improving the tensile strength after the heat history increases, but the conductivity decreases and the function as the conductive material decreases. For this reason, it is preferable that content of zirconium shall be 0.1 to 0.2 mass%. Therefore, by making the aluminum-based conductive material 14 contain zirconium in an amount of 0.1% by mass or more and 0.2% by mass or less, even if the aluminum-based conductive material 14 receives a high-temperature thermal history, the aluminum-based conductive material Therefore, the strength of the aluminum-based conductive material 14 can be maintained.

Next, a method for manufacturing a conductor wire made of the aluminum-based conductive material 14 will be described.
Using aluminum having a purity of 99.9% by mass or more, scandium having a purity of 99% by mass or more, and zirconium having a purity of 99% by mass or more, scandium is 0.27 to 0.32% by mass, and zirconium is 0.8%. A conductive material block made of an aluminum-zirconium-scandium alloy containing 1% by mass to 0.2% by mass is cast. Next, an aging treatment is performed at 250 to 450 ° C. for 0.5 to 30 hours, and a rod having a diameter of, for example, 10 mm is manufactured by cutting from the conductive material block after the aging treatment.

By aging the aluminum-zirconium-scandium alloy, scandium and aluminum in the aluminum-zirconium-scandium alloy react with each other, and Al ₃ Sc, which is an aluminum-scandium-based intermetallic compound, becomes a nanoprecipitate 17. And formed at the grain boundaries of aluminum-based alloy crystal grains. From the investigation of the nanoprecipitate 17 present in the metal structure, it was confirmed that almost all of the added scandium reacted with aluminum to produce Al ₃ Sc.
Here, the average particle diameter of the nanoprecipitate 17 can be set in the range of 1 nm or more and 60 nm or less by adjusting the conditions of the aging treatment (heating temperature and heating time). For example, when the heating temperature is 350 ° C. and the heating time is 0.1 hour, the maximum particle size of the nanoprecipitate 17 is 2 nm and the average particle size is 1 nm. When the heating temperature is 350 ° C. and the heating time is 3 hours, the maximum particle size of the nanoprecipitate 13 is 10 nm, and the average particle size is 5 nm. Furthermore, when the heating temperature is 350 ° C. and the heating time is 40 hours, the maximum particle size of the nanoprecipitate 13 is 90 nm and the average particle size is 60 nm.

Next, the wire is formed by rolling the rod using a swaging machine so that the outer diameter is, for example, about 1.5 to 2 mm. Then, wire drawing of the wire is performed to form an original conductor strand having a wire diameter of 0.05 mm or more and 0.5 mm or less. Here, after the degree of work (corresponding strain) in forming the wire by rolling the rod is set to 3 to 4, a heat treatment for promoting equiaxed crystal formation (for example, the heat treatment temperature is 30 to 70 of the melting point of the rod). %), And then, an original conductor wire is formed from the wire by die drawing. Here, by setting the degree of processing (equivalent strain) when forming the original conductor wire to, for example, 4 to 6, preferably 5 to 6, the average grain size of the crystal grains 15 constituting the metal structure is 2 μm. It becomes. Note that the presence of the nanoprecipitate 17 at the grain boundaries of the crystal grains constituting the metal structure of the wire causes recrystallization to occur in the metal structure constituting the wire as a result of processing. Is formed, grain growth is suppressed, and the average grain size of the crystal grains 15 can be easily reduced to 2 μm or less.

The degree of processing for forming a wire from a rod is 3 to 4, and the degree of processing for die drawing is 4 to 6.5, preferably 6 to 6.5. The average grain size of 1.6 μm and the proportion of crystal grains 15 of 1 μm or less is 15% in terms of cross-sectional area, and the degree of processing to form a wire from a rod is 3 to 4, and the degree of processing of die wire drawing Is set to 4 to 7, and preferably 6.5 to 7, the average grain size of the crystal grains 15 constituting the metal structure is 1.5 μm, and the ratio of the crystal grains 15 of 1 μm or less is the cross-sectional area ratio. 20%. Further, the processing degree of forming the wire from the rod is 3 to 4, and the processing degree of the die drawing process is 5 to 8, preferably more than 7 and 8 or less, so that the average of the crystal grains 15 constituting the metal structure The ratio of the presence of crystal grains 15 having a grain size of 1.2 μm and 1 μm or less is 50% in terms of the cross-sectional area ratio.

Subsequently, a heat treatment is performed on the original conductor wire to remove strain remaining in the crystal grains 15 constituting the metal structure of the original conductor wire, thereby obtaining a conductor wire. The temperature of the heat treatment is a temperature lower than the recrystallization temperature of the crystal grains 15 constituting the metal structure of the original conductor wire. For example, when the processing degree when forming the original conductor wire is 4 to 6 and the average grain size of the crystal grains 15 constituting the metal structure is 2 μm, the Vickers of the metal structure forming the original conductor wire The hardness is 75 to 85. In order to reduce the Vickers hardness to 50 to 70, the heat treatment temperature is set to 250 to 400 ° C., and the treatment time is set to 0.1 to 5 hours.

In addition, the degree of processing at the time of forming the original conductor wire is 4 to 6.5, and the existing ratio of the crystal grains 15 constituting the metal structure of 1 μm or less is 15% in terms of the cross-sectional area ratio (the average grain diameter of the crystal grains 15). 1.6 μm), the Vickers hardness of the metal structure forming the original conductor wire is 75 to 85. To reduce the Vickers hardness to 50 to 70, the heat treatment temperature is set to 250 to 400 ° C. Set the treatment time to 0.1-5 hours. Furthermore, when the degree of processing at the time of forming the original conductor wire is 4 to 7, and the existing ratio of 1 μm or less is 20% in terms of the cross-sectional area ratio (the average particle diameter of the crystal grains 15 is 1.5 μm), the original conductor The Vickers hardness of the metal structure forming the strand is 75 to 90. To reduce the Vickers hardness to 50 to 70, the heat treatment temperature is set to 250 to 400 ° C. and the treatment time is set to 0.1 to 5 hours. To do. Then, when the degree of processing at the time of forming the original conductor wire is 5 to 8, the existing ratio of 1 μm or less is 50% in terms of the cross-sectional area ratio (the average particle diameter of the crystal grains 15 is 1.2 μm), the original conductor The Vickers hardness of the metal structure forming the strand is 80 to 95. To reduce the Vickers hardness to 50 to 70, the heat treatment temperature is set to 250 to 400 ° C. and the treatment time is set to 0.1 to 5 hours. To do.

A cable made of an aluminum-based conductive material 14 according to the second embodiment of the present invention and using a conductor wire having a conductor wire diameter of 0.05 mm or more and 0.5 mm or less is used as a robot cable, such as a factory or disaster site. When used for wiring of a drive unit such as a robot arm that may be exposed to a high temperature environment, the tensile strength and durability of the cable can be maintained even if the robot is temporarily exposed to high heat. Therefore, for example, the robot can be stably operated over the design operation period estimated from the fatigue life data of the cable, and the reliability of the robot can be improved and the burden of maintenance can be reduced.

A cable made of an aluminum-based conductive material 14 according to a second embodiment of the present invention and having a conductor wire diameter of 0.05 mm or more and 0.5 mm or less is used as a connector for a quick charging stand machine of an electric vehicle. When used as a cable or a cabtyre cable of an electric welder, even if a large current flows during use and the temperature of the cable temporarily rises, the cable's tensile strength and eventually durability can be maintained. It can be used stably over the design operation period estimated from the fatigue life data of the cable, and the reliability of the quick charging stand machine and the electric welding machine can be improved and the burden of maintenance can be reduced.

Photovoltaic power generation using, as an in-apparatus wiring cable, a cable made of an aluminum-based conductive material 14 according to a second embodiment of the present invention and using a conductor strand having a conductor strand diameter of 0.05 mm to 0.5 mm. When used as a module connection cable, even if the cable temperature changes greatly due to environmental changes, the cable's tensile strength and durability can be maintained, and the cable is designed and operated from the fatigue life data of the cable. It can be used stably over a period of time, improves the reliability of the photovoltaic power generation module, and reduces the maintenance burden.

Next, experimental examples and comparative examples performed for confirming the effects of the present invention will be described below.
(Experimental Examples 1 to 18)
An aluminum crystal grain having an average particle diameter of 2 μm, and a metal structure in which 0.1 mass% of an aluminum-scandium-based nanoprecipitate having an average particle diameter of 5 nm is present at the grain boundary of the aluminum crystal grain, Conductor wires 1, 2, and 3 made of an aluminum-based conductive material with Vickers hardness adjusted to 50, 60, and 70, respectively, aluminum crystal grains having an average grain diameter of 2 μm, and aluminum crystals An aluminum base composed of a metal structure in which 0.3 mass% of aluminum-scandium nanoprecipitates having an average particle diameter of 5 nm are present at the grain boundaries of the grains, and the Vickers hardness is adjusted to 50, 60, and 70, respectively. The conductor strands 4, 5, 6 made of a conductive material, aluminum crystal grains having an average grain diameter of 2 μm, and grain boundaries of aluminum crystal grains A wire diameter made of an aluminum-based conductive material composed of a metal structure in which 1% by mass of aluminum-scandium nanoprecipitates having an average particle diameter of 5 nm are present and Vickers hardness is adjusted to 50, 60, and 70, respectively. 80 μm conductor wires 7, 8, and 9 were produced, respectively, and twisted wires were formed using the obtained conductor composite wires 1 to 9 to produce cables 1 to 9 having a cross-sectional area of 0.2 mm ² .

Also, aluminum-scandium having an average particle diameter of 5 nm at the grain boundary of aluminum crystal grains having an average grain diameter of 1.5 μm (crystal grains of 1 μm or less are present in a cross-sectional area ratio of 20%) and aluminum crystal grains. Conductor strands 10 and 11 having a wire diameter of 80 μm made of an aluminum-based conductive material composed of a metal structure containing 0.1% by mass of nanoprecipitates and adjusted to Vickers hardness of 50, 60 and 70, respectively. 12 and aluminum having an average grain size of 1.5 nm (a crystal grain of 1 μm or less is present in a cross-sectional area of 20%) and aluminum having an average grain size of 5 nm at the grain boundary of the aluminum crystal grains -A wire made of an aluminum-based conductive material composed of a metal structure containing 0.3% by mass of scandium-based nanoprecipitates and adjusted to Vickers hardness of 50, 60 and 70, respectively. Conductor wires 13, 14, 15 having a diameter of 80 μm, aluminum crystal grains having an average grain size of 1.5 μm (crystal grains of 1 μm or less are present in a cross-sectional area ratio of 20%), and grain boundaries of the aluminum crystal grains A wire made of an aluminum-based conductive material composed of a metal structure in which 1% by mass of an aluminum-scandium nanoprecipitate having an average particle diameter of 5 nm is present and having a Vickers hardness adjusted to 50, 60, and 70, respectively. Conductor strands 16, 17 and 18 having a diameter of 80 μm were respectively produced, and twisted wires were formed using the obtained conductor strands 10 to 18 to produce cables 10 to 18 having a cross-sectional area of 0.2 mm ² .

Then, with a load of 100 g applied to cables 1 to 18 at room temperature, a bending test (dynamic driving test) is performed in which a bending radius is 15 mm and a bending angle range is ± 90 degrees, and bending is performed repeatedly to determine the number of breaks. It was. In addition, the electrical conductivities were obtained using the produced cables 1 to 18, respectively. Table 1 shows the number of breaks and electrical conductivity obtained.

Parts having the same cross-sectional structure on average as the conductor wires 1 to 18 and having a length of 30 mm, a width of 3 mm, and a thickness of 0.3 mm, respectively, and being 24 mm away from one end of the member in the longitudinal direction A circular hole having a diameter of 0.5 mm was formed at the center in the width direction. Next, test pieces 1 to 18 were prepared by mirror finishing the surface of the member in which the circular hole was formed. Subsequently, a holder is attached to the other end of each of the test pieces 1 to 18 so that the tip of the holder is 1 mm from the center of the circular hole, and the holder is attached to the acoustic speaker with one end of the test pieces 1 to 18 facing downward. A fatigue test was performed by fixing the test piece 1 to 18 to the primary resonance state by fixing the test piece 1 to 18 with the voice coil being vibrated. It should be noted that the maximum stress generated at the base of the holders of the test pieces 1 to 18 was obtained from the bending stress formula of the cantilever beam and used as the stress amplitude during the fatigue test. And the breaking stress whose stress repetition number is 10 ⁶ times was calculated | required, and it was set as fatigue strength. Table 1 shows the obtained fatigue strength.

(Comparative Examples R1 to R24)
An aluminum crystal grain having an average particle diameter of 2 μm and a metal structure in which 0.05 mass% of an aluminum-scandium-based nanoprecipitate having an average particle diameter of 5 nm is present at the grain boundary of the aluminum crystal grain, Conductor strands R1, R2, and R3 made of an aluminum-based conductive material with Vickers hardness adjusted to 50, 60, and 70, respectively, aluminum crystal grains having an average grain diameter of 2 μm, and aluminum crystals An aluminum base composed of a metal structure in which 1.1 mass% of aluminum-scandium nanoprecipitates having an average particle diameter of 5 nm are present at the grain boundaries of the grains, and the Vickers hardness is adjusted to 50, 60, and 70, respectively. Conductor wires R4, R5, R6 made of a conductive material and having a diameter of 80 μm, aluminum crystal grains having an average grain size of 1.5 μm, aluminum Aluminum composed of a metal structure in which 0.05% by mass of an aluminum-scandium nanoprecipitate having an average particle diameter of 5 nm is present at the grain boundary of crystal grains, and Vickers hardness is adjusted to 50, 60, and 70, respectively. Conductor strands R7, R8, R9 with a wire diameter of 80 μm made of a base conductive material, aluminum crystal grains with an average grain diameter of 1.5 μm, and grain boundaries of aluminum crystal grains with an average grain diameter of 5 nm Conductor element having a wire diameter of 80 μm made of an aluminum-based conductive material composed of a metal structure containing 1.1 mass% of an aluminum-scandium nanoprecipitate and having Vickers hardness adjusted to 50, 60, and 70, respectively. Wires R10, R11, and R12 are respectively produced, and twisted wires are formed using the obtained conductor strands R1 to R12, and cables R1 to R1 having a cross-sectional area of 0.2 mm ² are formed. 2 was produced.

Further, a metal structure in which 0.05 mass% of aluminum-scandium-based nanoprecipitates having an average particle diameter of 5 nm are present at the grain boundaries between aluminum crystal grains having an average particle diameter of 2.5 μm and aluminum crystal grains. Conductor strands R13, R14, and R15 having a wire diameter of 80 μm and aluminum crystals having an average particle diameter of 2.5 μm and made of an aluminum-based conductive material adjusted to Vickers hardness of 50, 60, and 70, respectively. And a metal structure in which aluminum-scandium-based nanoprecipitates having an average particle diameter of 5 nm are present at grain boundaries between aluminum grains and Vickers hardness of 50, 60, and 70, respectively. Conductor strands R16, R17, R18 having a wire diameter of 80 μm and aluminum having an average particle diameter of 2.5 μm made of an aluminum-based conductive material adjusted to And a metal structure in which 1% by mass of an aluminum-scandium nanoprecipitate having an average particle diameter of 5 nm is present at the grain boundary of the aluminum crystal grains, and has a Vickers hardness of 50, 60, 70, respectively. The conductor strands R19, R20, R21 having a wire diameter of 80 μm and made of an aluminum-based conductive material adjusted to an average diameter of 2.5 μm of aluminum crystal grains and the grain boundaries of the aluminum crystal grains A wire made of an aluminum-based conductive material composed of a metal structure in which 1.1 mass% of aluminum-scandium nanoprecipitates having a particle size of 5 nm are present and Vickers hardness is adjusted to 50, 60, and 70, respectively. R22, R23, and R24 each having a diameter of 80 μm are respectively produced, and twisted wires are formed using the obtained conductor wires R13 to R24, and the cross-sectional area is 0.2 mm ^2. Cables R13 to R24 were prepared.

The cables R1 to R24 were subjected to the same bending test as in Experimental Example 1 to obtain the number of breaks, and the electrical conductivities were obtained using the cables R1 to R24 produced. Table 2 shows the obtained number of breaks and electrical conductivity. Similarly to Experimental Example 1, conductor strands R1 to R24 and test pieces R1 to R24 having a substantially similar cross-sectional structure on average were produced and subjected to a fatigue test, and the number of stress repetitions was 10 ⁶ times. The stress was obtained and used as fatigue strength. The obtained fatigue strength is shown in Table 2.

(Comparative Examples R25 to R46)
An aluminum crystal grain having an average particle diameter of 2 μm, and a metal structure in which 0.1 mass% of an aluminum-scandium-based nanoprecipitate having an average particle diameter of 5 nm is present at the grain boundary of the aluminum crystal grain, Conductor strands R25 and R26 having a wire diameter of 80 μm, made of an aluminum-based conductive material with Vickers hardness adjusted to 45 and 75, respectively, aluminum crystal grains having an average grain diameter of 2 μm, and grain boundaries of aluminum crystal grains In addition, an aluminum-scandium-based nanoprecipitate having an average particle diameter of 5 nm was made of an aluminum-based conductive material composed of a metal structure in which 0.3% by mass was present and the Vickers hardness was adjusted to 45 and 75, respectively. At the grain boundaries of conductor strands R27 and R28 having a wire diameter of 80 μm, aluminum crystal grains having an average grain diameter of 2 μm, and aluminum crystal grains, an average grain Conductor element having a wire diameter of 80 μm made of an aluminum-based conductive material composed of a metal structure containing 1% by mass of aluminum-scandium nanoprecipitates having a diameter of 5 nm and having Vickers hardness adjusted to 45 and 75, respectively. Wires R29 and R30 were produced respectively, and twisted wires were formed using the obtained conductor composite strands R25 to R30 to produce cables R25 to R30 having a cross-sectional area of 0.2 mm ² .

Also, aluminum-scandium having an average particle diameter of 5 nm at the grain boundary of aluminum crystal grains having an average grain diameter of 1.5 μm (crystal grains of 1 μm or less are present in a cross-sectional area ratio of 20%) and aluminum crystal grains. Conductor strands R31 and R32 having a wire diameter of 80 μm made of an aluminum-based conductive material that is composed of a metal structure in which 0.1% by mass of nanoprecipitates of the system are present and whose Vickers hardness is adjusted to 45 and 75, respectively; An aluminum-scandium-based aluminum particle having an average particle diameter of 5 nm is formed at the grain boundary between aluminum crystal grains having an average grain diameter of 1.5 μm (crystal grains of 1 μm or less are present in a cross-sectional area of 20%) and aluminum crystal grains. Conductive material having a wire diameter of 80 μm made of an aluminum-based conductive material composed of a metal structure containing 0.3% by mass of nanoprecipitates and having Vickers hardness adjusted to 45 and 75, respectively. The average grain size is 5 nm at the grain boundaries of the strands R33 and R34, aluminum crystal grains having an average grain size of 1.5 μm (crystal grains of 1 μm or less are present in a cross-sectional area of 20%), and aluminum crystal grains. A conductor wire R35 having a wire diameter of 80 μm made of an aluminum-based conductive material composed of a metal structure containing 1% by mass of an aluminum-scandium nanoprecipitate and having a Vickers hardness adjusted to 45 and 75, respectively. R36 was produced, respectively, and twisted wires were formed using the obtained conductor strands R31 to R36, and cables R31 to R36 having a cross-sectional area of 0.2 mm ² were produced.

Further, a metal structure in which 0.05 mass% of aluminum-scandium-based nanoprecipitates having an average particle diameter of 5 nm are present at the grain boundaries between aluminum crystal grains having an average particle diameter of 2.5 μm and aluminum crystal grains. Conductor wires R37 and R38 having a wire diameter of 80 μm and made of an aluminum-based conductive material adjusted to Vickers hardness of 45 and 75, respectively, and aluminum crystal grains having an average particle diameter of 2.5 μm, Aluminum having an aluminum-scandium-based nanoprecipitate having an average particle diameter of 5 nm at a grain boundary of aluminum and having a metal structure of 0.1% by mass, and having a Vickers hardness adjusted to 45 and 75, respectively. Conductor strands R39 and R40 having a wire diameter of 80 μm made of a base conductive material, aluminum crystal grains having an average particle diameter of 2.5 μm, and aluminum Aluminum-based conductivity composed of a metal structure in which 0.3% by mass of aluminum-scandium nanoprecipitates having an average particle diameter of 5 nm are present at the grain boundaries of the crystal grains, and the Vickers hardness is adjusted to 45 and 75, respectively. Conductor strands R41 and R42 having a wire diameter of 80 μm made of the material, aluminum crystal grains having an average grain diameter of 2.5 μm, and aluminum-scandium having an average grain diameter of 5 nm at the grain boundaries of the aluminum crystal grains Conductor strands R43 and R44 having a wire diameter of 80 μm made of an aluminum-based conductive material composed of a metal structure containing 1% by mass of nanoprecipitates and having Vickers hardness adjusted to 45 and 75, respectively, An aluminum-scandium nanocrystal having an average grain size of 5 nm at the grain boundaries of aluminum having a diameter of 2.5 μm and the grain of aluminum. Conductor strands R45 and R46 having a wire diameter of 80 μm made of an aluminum-based conductive material that is composed of a metal structure with 1.1% by mass of the extract and adjusted to Vickers hardness of 45 and 75, respectively. Using the obtained conductor wires R37 to R46, twisted wires were formed to produce cables R37 to R46 having a cross-sectional area of 0.2 mm ² .

The cables R25 to R46 were subjected to the same bending test as in Experimental Example 1 to obtain the number of breaks, and the electrical conductivities were obtained using the cables R25 to R46 produced. Table 3 shows the number of breaks and electrical conductivity obtained. Similarly to Experimental Example 1, conductor strands R25 to R46 and test pieces R25 to R46 having a substantially similar cross-sectional structure on average were produced and subjected to a fatigue test, and the number of stress repetitions was 10 ⁶ times. The stress was obtained and used as fatigue strength. The obtained fatigue strength is shown in Table 3.

(Experimental Examples 19 to 36)
An aluminum crystal grain having an average particle diameter of 2 μm, and a metal structure in which 0.1 mass% of an aluminum-scandium nanoprecipitate having an average particle diameter of 1 nm is present at the grain boundary of the aluminum crystal grain; Conductor strands 19, 20, and 21 made of an aluminum-based conductive material with Vickers hardness adjusted to 50, 60, and 70, respectively, aluminum crystal grains having an average grain size of 2 μm, and aluminum crystals An aluminum base composed of a metal structure in which 0.3 mass% of aluminum-scandium nanoprecipitates having an average particle diameter of 1 nm are present at the grain boundaries of the grains, and the Vickers hardness is adjusted to 50, 60, and 70, respectively. Conductor wires 22, 23, and 24 made of a conductive material, an aluminum crystal grain having an average grain size of 2 μm, and an aluminum crystal grain An aluminum-based conductive material composed of a metal structure in which 1% by mass of an aluminum-scandium nanoprecipitate having an average particle diameter of 1 nm is present at the grain boundary, and the Vickers hardness is adjusted to 50, 60, and 70, respectively. The produced conductor strands 25, 26 and 27 having a wire diameter of 80 μm are respectively produced, and twisted wires are formed using the obtained conductor composite strands 19 to 27, and the cables 19 to 27 having a cross-sectional area of 0.2 mm ² are formed. Was made.

In addition, aluminum-scandium having an average grain size of 1 nm at the grain boundary between aluminum crystal grains having an average grain diameter of 1.5 μm (crystal grains having a size of 1 μm or less are present in a cross-sectional area of 20%) and aluminum crystal grains. Conductor strands 28 and 29 having a wire diameter of 80 μm made of an aluminum-based conductive material composed of a metal structure containing 0.1% by mass of nanoprecipitates and having Vickers hardness adjusted to 50, 60 and 70, respectively. 30 and an aluminum grain having an average grain size of 1 nm at the grain boundary of aluminum grains having an average grain diameter of 1.5 μm (crystal grains of 1 μm or less are present in a cross-sectional area of 20%) and aluminum crystal grains -A wire made of an aluminum-based conductive material composed of a metal structure containing 0.3% by mass of scandium-based nanoprecipitates and adjusted to Vickers hardness of 50, 60 and 70, respectively. Conductor wires 31, 32, 33 having a diameter of 80 μm, aluminum crystal grains having an average grain size of 1.5 μm (crystal grains having a diameter of 1 μm or less are present in a cross-sectional area of 20%), and grain boundaries of the aluminum crystal grains A wire made of an aluminum-based conductive material composed of a metal structure in which 1% by mass of an aluminum-scandium nanoprecipitate having an average particle diameter of 1 nm is present and having a Vickers hardness adjusted to 50, 60, and 70, respectively. Conductor strands 34, 35, and 36 having a diameter of 80 μm were produced, respectively, and twisted wires were formed using the obtained conductor strands 28 to 36 to produce cables 28 to 36 having a cross-sectional area of 0.2 mm ² .

The cables 19 to 36 were subjected to the same bending test as in Experimental Example 1 to obtain the number of breaks, and the electrical conductivity was obtained using the cables 19 to 36 produced. Table 4 shows the number of breaks and electrical conductivity obtained. Similarly to Experimental Example 1, the conductor strands 19 to 36 and the test pieces 19 to 36 having substantially the same cross-sectional structure on average were prepared and subjected to a fatigue test, and the number of stress repetitions was 10 ⁶ times. The stress was obtained and used as fatigue strength. Table 4 shows the obtained fatigue strength.

(Experimental Examples 37-54)
An aluminum crystal grain having an average particle diameter of 2 μm and a metal structure in which 0.1 mass% of an aluminum-scandium-based nanoprecipitate having an average particle diameter of 60 nm is present at the grain boundary of the aluminum crystal grain, Conductor strands 37, 38, 39 having a wire diameter of 80 μm, aluminum crystal grains having an average particle diameter of 2 μm, and aluminum crystals made of an aluminum-based conductive material with Vickers hardness adjusted to 50, 60, 70, respectively An aluminum base composed of a metal structure in which 0.3 mass% of aluminum-scandium nanoprecipitates having an average particle diameter of 60 nm are present at the grain boundaries of the grains, and the Vickers hardness is adjusted to 50, 60, and 70, respectively. Conductor wires 40, 41, and 42 made of a conductive material, an aluminum crystal grain having an average grain size of 2 μm, and a bonding of aluminum. Aluminum-based electrical conductivity composed of a metal structure in which 1% by mass of an aluminum-scandium nanoprecipitate having an average particle diameter of 60 nm is present at a grain boundary, and the Vickers hardness is adjusted to 50, 60, and 70, respectively. Conductor strands 43, 44, and 45 made of a material having a wire diameter of 80 μm are respectively fabricated, and twisted wires are formed using the obtained conductor composite strands 37 to 45, and the cross-sectional area of the cable 37 is 0.2 mm ² . To 45 were produced.

Also, aluminum-scandium having an average grain size of 60 nm at the grain boundary between aluminum crystal grains having an average grain diameter of 1.5 μm (crystal grains of 1 μm or less are present in a cross-sectional area of 20%) and aluminum crystal grains. Conductor wires 46 and 47 having a wire diameter of 80 μm made of an aluminum-based conductive material composed of a metal structure in which 0.1% by mass of nanoprecipitates of the system are present and Vickers hardness is adjusted to 50, 60 and 70, respectively. 48, aluminum having an average grain size of 1.5 μm (a crystal grain of 1 μm or less is present in a cross-sectional area of 20%) and aluminum having an average grain size of 60 nm at the grain boundary of the aluminum crystal grains -Made of an aluminum-based conductive material composed of a metal structure containing 0.3% by mass of scandium-based nanoprecipitates and adjusted to Vickers hardness of 50, 60, and 70, respectively. Conductor strands 49, 50, 51 having a wire diameter of 80 μm, aluminum crystal grains having an average grain size of 1.5 μm (crystal grains of 1 μm or less are present in a cross-sectional area ratio of 20%), and grains of aluminum crystal grains It is made of an aluminum-based conductive material composed of a metal structure in which 1% by mass of aluminum-scandium-based nanoprecipitates having an average particle diameter of 60 nm are present at the boundary, and the Vickers hardness is adjusted to 50, 60, and 70, respectively. Conductor strands 52, 53, and 54 having a wire diameter of 80 μm were respectively produced, and twisted wires were formed using the obtained conductor strands 46 to 54 to produce cables 46 to 54 having a cross-sectional area of 0.2 mm ² . .

Then, the cables 37 to 54 were subjected to the same bending test as in Experimental Example 1 to obtain the number of breaks, and the electrical conductivities were obtained using the cables 37 to 54 produced. Table 5 shows the obtained number of breaks and electrical conductivity. Similarly to Experimental Example 1, conductor strands 37 to 54 and test pieces 37 to 54 having a substantially similar cross-sectional structure on average were produced and subjected to a fatigue test, and the number of stress repetitions was 10 ⁶ times. The stress was obtained and used as fatigue strength. The obtained fatigue strength is shown in Table 5.

(Comparative Examples R47 to R64)
An aluminum crystal grain having an average particle diameter of 2 μm and a metal structure in which 0.1 mass% of an aluminum-scandium nanoprecipitate having an average particle diameter of 0.5 nm is present at the grain boundary of the aluminum crystal grain. Conductor strands R47, R48, R49 having a wire diameter of 80 μm, made of an aluminum-based conductive material with Vickers hardness adjusted to 50, 60, 70, respectively, aluminum crystal grains having an average particle size of 2 μm, and aluminum Composed of a metal structure in which 0.3% by mass of an aluminum-scandium nanoprecipitate having an average particle diameter of 0.5 nm is present at the grain boundary of the crystal grains, and the Vickers hardness is adjusted to 50, 60, and 70, respectively. Conductor strands R50, R51, R52 having a wire diameter of 80 μm and made of an aluminum-based conductive material, aluminum crystal grains having an average particle diameter of 2 μm, It is composed of a metal structure in which 1% by mass of an aluminum-scandium nanoprecipitate having an average particle diameter of 0.5 nm is present at the grain boundary of aluminum crystal grains, and the Vickers hardness is adjusted to 50, 60, and 70, respectively. Conductor strands R53, R54, and R55 made of an aluminum-based conductive material having a wire diameter of 80 μm are respectively fabricated, and twisted wires are formed using the obtained conductor composite strands R47 to R55, and the cross-sectional area is 0.2 mm. ^Two cables R47 to R55 were produced.

Further, aluminum grains having an average grain size of 1.5 μm (crystal grains having a size of 1 μm or less are present in a cross-sectional area of 20%) and aluminum having an average grain size of 0.5 nm at the grain boundaries of the aluminum crystal grains A conductor strand R56 having a wire diameter of 80 μm made of an aluminum-based conductive material composed of a metal structure containing scandium-based nanoprecipitates of 0.1% by mass and having Vickers hardness adjusted to 50, 60 and 70, respectively; , R57, R58, an average grain size of 0.1 μm between the grain boundaries of aluminum crystal grains having an average grain size of 1.5 μm (a crystal grain of 1 μm or less is 20% in cross-sectional area ratio) and aluminum crystal grains. Aluminum-based conductive material composed of a metal structure in which 0.3% by mass of aluminum-scandium nanoprecipitates having a thickness of 5 nm are present, and having a Vickers hardness adjusted to 50, 60, and 70, respectively Conductor wires R59, R60, R61 having a wire diameter of 80 μm, aluminum crystal grains having an average particle diameter of 1.5 μm (crystal grains having a diameter of 1 μm or less are present in a cross-sectional area ratio of 20%), and aluminum crystals Aluminum base composed of a metal structure in which 1% by mass of an aluminum-scandium nanoprecipitate having an average particle diameter of 0.5 nm is present at the grain boundary of the grain, and the Vickers hardness is adjusted to 50, 60, and 70, respectively. Conductor strands R62, R63, R64 made of a conductive material and having a wire diameter of 80 μm are respectively produced, and twisted wires are formed using the obtained conductor strands R56 to R64, and a cable R56 having a cross-sectional area of 0.2 mm ² To R64 were produced.

The cables R47 to R64 were subjected to the same bending test as in Experimental Example 1 to obtain the number of breaks, and the electrical conductivities were obtained using the cables R47 to R64 produced. The obtained number of breaks and electrical conductivity are shown in Table 6. Similarly to Experimental Example 1, conductor strands R47 to R64 and test pieces R47 to R64 having a substantially similar cross-sectional structure on average were produced and subjected to a fatigue test, and the number of stress repetitions was 10 ⁶ times. The stress was obtained and used as fatigue strength. The obtained fatigue strength is shown in Table 6.

(Comparative Examples R65 to R82)
An aluminum crystal grain having an average particle diameter of 2 μm, and a metal structure in which 0.1 mass% of an aluminum-scandium nanoprecipitate having an average particle diameter of 65 nm is present at the grain boundary of the aluminum crystal grain; Conductor wires R65, R66, R67 having a wire diameter of 80 μm, made of an aluminum-based conductive material with Vickers hardness adjusted to 50, 60, 70, respectively, aluminum crystal grains having an average particle size of 2 μm, and aluminum crystals An aluminum base composed of a metal structure in which 0.3 mass% of aluminum-scandium nanoprecipitates having an average particle diameter of 65 nm are present at the grain boundaries of the grains, and the Vickers hardness is adjusted to 50, 60, and 70, respectively. Conductor strands R68, R69, R70 made of a conductive material, aluminum crystal grains having an average grain size of 2 μm, and Al Aluminum having an aluminum-scandium-based nanoprecipitate with an average particle diameter of 65 nm at the grain boundary of the minium crystal grains and having a Vickers hardness adjusted to 50, 60, and 70, respectively. Conductor wires R71, R72, and R73 each made of a base conductive material and having a wire diameter of 80 μm are prepared, and twisted wires are formed using the obtained conductor composite wires R65 to R73, and the cross-sectional area is 0.2 mm ² . Cables R65 to R73 were produced.

Also, aluminum-scandium having an average grain size of 65 nm at the grain boundary between aluminum crystal grains having an average grain diameter of 1.5 μm (crystal grains of 1 μm or less are present in a cross-sectional area ratio of 20%) and aluminum crystal grains. Conductor strands R74 and R75 having a wire diameter of 80 μm made of an aluminum-based conductive material composed of a metal structure containing 0.1% by mass of nanoprecipitates and adjusted to Vickers hardness of 50, 60, and 70, respectively. , R76, aluminum having an average grain size of 1.5 nm (a crystal grain of 1 μm or less is present in a cross-sectional area of 20%) and aluminum having an average grain size of 65 nm at the grain boundary of the aluminum crystal grains -Made of an aluminum-based conductive material composed of a metal structure containing 0.3% by mass of scandium-based nanoprecipitates and adjusted to Vickers hardness of 50, 60 and 70, respectively. Conductor strands R77, R78, R79 having a wire diameter of 80 μm, aluminum crystal grains having an average grain diameter of 1.5 μm (crystal grains having a diameter of 1 μm or less are present in a cross-sectional area of 20%), and aluminum crystal grains An aluminum-based conductive material composed of a metal structure in which 1% by mass of an aluminum-scandium nanoprecipitate having an average particle diameter of 65 nm is present at the grain boundary and the Vickers hardness is adjusted to 50, 60, and 70, respectively. The produced conductor strands R80, R81, and R82 having a wire diameter of 80 μm are respectively produced, and twisted wires are formed using the obtained conductor strands R74 to R82, and cables R74 to R82 having a cross-sectional area of 0.2 mm ² are formed. Produced.

Then, the cables R65 to R82 were subjected to the same bending test as in Experiment Example 1 to obtain the number of breaks, and the electrical conductivity was obtained using the cables R65 to R82 produced. Table 7 shows the number of breaks and electrical conductivity obtained. Similarly to Experimental Example 1, conductor strands R65 to R82 and test pieces R65 to R82 having a substantially similar cross-sectional structure on average were produced and subjected to a fatigue test, and the number of stress repetitions was 10 ⁶ times. The stress was obtained and used as fatigue strength. Table 7 shows the obtained fatigue strength.

From the results shown in Tables 1 to 7, aluminum crystal grains having an average grain diameter of 2 μm or less and average grain diameters of 1 nm to 60 nm are present at a grain boundary of 0.1 to 1% by mass. aluminum - consists of a metal structure having a nanoprecipitates scandium system, a Vickers hardness of 50 or more 70 or less, when the fatigue strength when the repeat count 10 ⁶ times in fatigue test to load the repeated bending of at least 180MPa It can be confirmed that the conductivity is 56% IACS or more and the number of breaks is 10 million times or more.
Therefore, when a cable made using this aluminum-based conductive material is used, for example, as an electric wire for wiring of a drive unit of an industrial robot, the reliability of the robot can be improved and the maintenance burden can be reduced. Can do.

The present invention has been described above with reference to the embodiments. However, the present invention is not limited to the configurations described in the above-described embodiments, and is within the scope of the matters described in the claims. Other possible embodiments and modifications are also included.
Further, the present invention includes a combination of components included in the present embodiment and other embodiments and modifications.
For example, the case where the cable using the aluminum-based conductive material according to the first embodiment is used as a robot cable and is used as a wiring cable (an example of an in-apparatus wiring cable) for an elevator elevator part has been described. It can be used for a connector cable, a cabtyre cable, a bus bar cable, an automobile cable, an aircraft cable, a rocket cable, or a satellite cable of a quick charging stand machine.
In addition, the cable using the aluminum-based conductive material according to the second embodiment is used as a robot cable, as a connector cable for a quick charging stand machine of an electric vehicle, as a cabtire cable of an electric welder, and to connect a photovoltaic power generation module Although the case where it uses as a cable (an example of an in-apparatus wiring cable) respectively was demonstrated, it can be used for a cabtyre cable, a bus bar cable, an automobile cable, an aircraft cable, a rocket cable, or a satellite cable .

Aluminum-based conductive material that can be used for the wiring of the drive part of a robot or various devices by improving the tensile strength, bending resistance and elongation while miniaturizing the structure and reducing the residual strain, and the same A cable using can be provided.

10: Aluminum based conductive material, 11: Crystal grain, 12: Grain boundary, 13: Nano precipitate, 14: Aluminum based conductive material, 15: Crystal grain, 16: Grain boundary, 17: Nano precipitate

Claims (7)

1. An aluminum-based conductive material obtained by subjecting an aged aluminum-scandium alloy to processing to obtain a corresponding strain of 4 or more and then removing the remaining strain,
   Aluminum or aluminum-based alloy crystal grains having an average grain diameter of 2 μm or less, and aluminum having an average grain diameter of 1 nm to 60 nm and present at 0.1 to 1 mass% at the grain boundaries of the crystal grains— It is composed of a metal structure having scandium-based nanoprecipitates,
   Vickers hardness is a 50 to 70 inclusive, Motoshirube conductive material, wherein the fatigue strength when the repeat count 10 ⁶ times in fatigue test to load the repeated bending of at least 180 MPa.
2. 2. The aluminum-based conductive material according to claim 1, wherein the crystal grains are the aluminum-based alloy, and the aluminum-based alloy contains 0.1% by mass or more and 0.2% by mass or less of zirconium. Base conductive material.
3. 3. The aluminum-based conductive material according to claim 1, wherein the metal structure includes 15% or more of the crystal grains having a cross-sectional area ratio of 1 μm or less.
4. 4. The aluminum-based conductive material according to claim 3, wherein the metal structure includes 20% or more of the crystal grains of 1 μm or less in terms of cross-sectional area, and withstands a dynamic drive test in which repeated bending is applied at least 10 million times. An aluminum-based conductive material characterized by that.
5. 5. A cable using the aluminum-based conductive material according to claim 1 as a conductor wire, wherein the conductor wire has a wire diameter of 0.05 mm or more and 0.5 mm or less.
6. 6. The cable according to claim 5, wherein the cable is used as a robot cable, a connector cable for a quick charging stand machine, a cabtyre cable, a bus bar cable, or an in-device wiring cable.
7. 6. The cable according to claim 5, wherein the cable is used for an automobile cable, an aircraft cable, a rocket cable, or a satellite cable.

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