CN117500950A - Aluminum alloy extruded material and method for producing same - Google Patents
Aluminum alloy extruded material and method for producing same Download PDFInfo
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- CN117500950A CN117500950A CN202280043632.9A CN202280043632A CN117500950A CN 117500950 A CN117500950 A CN 117500950A CN 202280043632 A CN202280043632 A CN 202280043632A CN 117500950 A CN117500950 A CN 117500950A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 50
- 239000000463 material Substances 0.000 title claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 title description 22
- 238000001125 extrusion Methods 0.000 claims abstract description 22
- 239000012535 impurity Substances 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 16
- 238000010791 quenching Methods 0.000 claims description 12
- 230000000171 quenching effect Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 8
- 238000003303 reheating Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 6
- 230000035882 stress Effects 0.000 description 32
- 238000005336 cracking Methods 0.000 description 29
- 230000007797 corrosion Effects 0.000 description 28
- 238000005260 corrosion Methods 0.000 description 28
- 239000010949 copper Substances 0.000 description 12
- 238000012360 testing method Methods 0.000 description 11
- 230000007423 decrease Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 239000006104 solid solution Substances 0.000 description 7
- 230000032683 aging Effects 0.000 description 6
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 5
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000009835 boiling Methods 0.000 description 4
- 238000013001 point bending Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 229910000765 intermetallic Inorganic materials 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000009864 tensile test Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/053—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Extrusion Of Metal (AREA)
Abstract
An aluminum alloy extrusion material, wherein the components comprise: 3.0 to 6.0 mass percent of Mg:0.4 to 1.4 mass% of Fe:0.05 to 0.2 mass% of Cu:0.05 to 0.4 mass% of Ti:0.005 to 0.2 mass% of Zr:0.1 to 0.3 mass% of Cr:0.050 to 0.160 mass%, the balance: consists of Al and unavoidable impurities, and has a conductivity of 40.1-44.3% IACS.
Description
Technical Field
The present invention relates to an aluminum alloy extruded material and a method for producing the same.
Background
Conventionally, as aluminum members for frame materials, 6000-series aluminum alloy extruded materials having high strength have been mainly used. However, 6000 series aluminum alloys have high quenching sensitivity and are likely to be strained by quenching, and therefore are difficult to apply to members requiring precision. Therefore, there has been an attempt to apply 7000-series aluminum alloys, which have a problem of stress corrosion cracking but low quenching sensitivity, to frame materials.
Patent document 1 discloses an al—zn—mg alloy extruded material (i.e., 7000-series aluminum alloy extruded material) in which stress corrosion cracking resistance and the like of a T6 treated material are improved by controlling alloy composition and the like. Specifically, an alloy extrusion is disclosed, which is kept in a chromic acid boiling solution for 12 hours after loading a stress of 95% of yield strength by 3-point bending, and is free from cracking.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 10-30147
Disclosure of Invention
Problems to be solved by the invention
However, in the conventional technique disclosed in patent document 1, it is found that cracking is likely to occur when the solution is kept in a chromic acid boiling solution for 10 hours or more after a higher stress (100% of yield strength) is applied by 3-point bending, and there is room for further improvement in stress corrosion cracking resistance.
The present invention has been made in view of such circumstances, and an object thereof is to provide an aluminum alloy extruded material having improved stress corrosion cracking resistance and a method for producing the same.
Means for solving the problems
In embodiment 1 of the present invention, there is provided an aluminum alloy extruded material, wherein,
the composition group is formed into a group of components,
zn:3.0 to 6.0 mass percent,
Mg:0.4 to 1.4 mass percent,
Fe:0.05 to 0.2 mass percent,
Cu:0.05 to 0.4 mass percent,
Ti: 0.005-0.2 mass%,
Zr:0.1 to 0.3 mass percent,
Cr:0.050 to 0.160 mass%
The balance: is composed of Al and unavoidable impurities,
the conductivity is 40.1-44.3% IACS.
In the aluminum alloy extruded material according to embodiment 1 of the present invention, the Cr content is 0.070 to 0.120 mass%.
An aspect 3 of the present invention is the method for producing an aluminum alloy extruded material according to aspect 1 or 2, comprising the steps of:
a step of preparing a material having a composition,
zn:3.0 to 6.0 mass percent,
Mg:0.4 to 1.4 mass percent,
Fe:0.05 to 0.2 mass percent,
Cu:0.05 to 0.4 mass percent,
Ti: 0.005-0.2 mass%,
Zr:0.1 to 0.3 mass percent,
Cr:0.05 to 0.15 mass percent
The balance: consists of Al and unavoidable impurities;
heating the blank to 450-550 ℃;
cooling the heated billet to 300 ℃ or lower at an average cooling rate of 90 ℃/hour or more;
a step of reheating the cooled billet to 470 ℃ or higher to perform extrusion processing;
and quenching the extruded billet.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the embodiment of the present invention, an aluminum alloy extruded material having improved stress corrosion cracking resistance and a method for manufacturing the same can be provided.
Drawings
FIG. 1 is a graph showing the correspondence relationship between Cr content and electrical conductivity when an aluminum alloy extruded material is produced by a production method described later.
FIG. 2 is a graph showing the correspondence between the Cr content and the crack life in the stress corrosion cracking resistance test when an aluminum alloy extruded material is produced by the production method described later.
Fig. 3 schematically shows an example of a temperature change process in the method for producing an aluminum alloy extruded material according to the embodiment of the present invention.
Detailed Description
The present inventors have studied from various points of view in order to realize an aluminum alloy extruded material that can improve stress corrosion cracking resistance. As a result, it has been found that an aluminum alloy extruded material having improved stress corrosion cracking resistance can be obtained by containing Zn, mg, fe, cu, ti, zr and Cr, controlling the content thereof (in particular, the Cr content) within a predetermined range, and controlling the electrical conductivity within a predetermined range. It has also been found that it is necessary to control the composition of the components (in particular, the Cr content) and to appropriately control the production conditions (in particular, the billet heating temperature, the cooling rate, the reheating temperature, etc.) so as to control the electrical conductivity within a predetermined range.
Details of the respective elements specified in the embodiment of the present invention are shown below.
< 1 constituent composition >
The aluminum alloy extruded material according to the embodiment of the present invention preferably contains Zn in the composition: 3.0 to 6.0 mass percent of Mg:0.4 to 1.4 mass% of Fe:0.05 to 0.2 mass% of Cu:0.05 to 0.4 mass% of Ti:0.005 to 0.2 mass% of Zr:0.1 to 0.3 mass% of Cr:0.050 to 0.160 mass%, and the balance being aluminum and unavoidable impurities.
Hereinafter, each element will be described in detail.
(Zn: 3.0 to 6.0 mass%)
Zn is an element that increases the strength of an aluminum alloy extruded material together with Mg. In order to fully exert this effect, the Zn content is 3.0 mass% or more. On the other hand, if the Zn content is more than 6.0 mass%, the stress corrosion cracking resistance and general corrosion resistance are lowered. Therefore, the Zn content is 3.0 to 6.0 mass%.
(Mg: 0.4 to 1.4 mass%)
Mg is an element that increases the strength of the aluminum alloy extruded material together with Zn. In order to fully exert this effect, the Mg content is set to 0.4 mass% or more. On the other hand, if the Mg content is higher than 1.4 mass%, the extrudability decreases with an increase in extrusion pressure, and the elongation also decreases. Therefore, the content of Mg is 0.4 to 1.4 mass%.
(Fe: 0.05-0.2 mass%)
Fe is a main unavoidable impurity of the aluminum alloy, and is not more than 0.2 mass% because it does not deteriorate the properties of the aluminum alloy extrudate. On the other hand, if Fe in the aluminum alloy extruded material is reduced to less than 0.05 mass%, the burden on the cost is large. Therefore, the Fe content is 0.05 to 0.2 mass%.
(Cu: 0.05 to 0.4 mass%)
Cu is an element that improves the strength of the aluminum alloy extruded material. If the Cu content is less than 0.05 mass%, the strength-improving effect is insufficient, whereas if it is more than 0.4 mass%, the extrudability is reduced. Therefore, the Cu content is 0.05 to 0.4 mass%. The upper limit value of the Cu content is preferably 0.2 mass% from the viewpoint of extrudability.
(Ti: 0.005-0.2 mass%)
Ti has an effect of improving the moldability of the extruded material, and is added at least 0.005 mass%. On the other hand, if the content exceeds 0.2 mass%, the effect is saturated, and coarse intermetallic compounds may be crystallized to become the starting point of destruction, so that the mechanical properties are lowered. Accordingly, the Ti content is 0.005 to 0.2% by mass, preferably 0.005 to 0.1% by mass, more preferably 0.005 to 0.05% by mass.
(Zr: 0.1-0.3 mass%)
Zr inhibits the recrystallization of the aluminum alloy extrusion material and has the function of improving the stress corrosion cracking resistance. If the Zr content is less than 0.1 mass%, the effect is insufficient, and if it exceeds 0.3 mass%, the extrudability is lowered, and the quenching sensitivity is improved, resulting in a decrease in strength. Accordingly, the Zr content is 0.1 to 0.3 mass%.
(Cr: 0.050 to 0.160% by mass)
The inventors of the present invention found that Cr is closely related to stress corrosion cracking resistance when an aluminum alloy extruded material is produced by the production method described below. If the Cr content is less than 0.050% by mass, the stress corrosion cracking resistance is lowered. The Cr content is preferably 0.063 mass% or more, more preferably 0.070 mass% or more. On the other hand, if the Cr content exceeds 0.160 mass%, the intermetallic compound of Cr starts to precipitate, and the stress corrosion cracking resistance is lowered. The Cr content is preferably 0.135 mass% or less, more preferably 0.120 mass% or less.
The aluminum alloy extruded material according to the embodiment of the present invention contains the above-described component composition, and in one embodiment of the present invention, the balance is preferably aluminum and unavoidable impurities. As unavoidable impurities, elements brought in according to the conditions of raw materials, manufacturing facilities, and the like are allowed to be mixed in. For example, fe is generally contained in a smaller amount, and therefore is an unavoidable impurity, but as described above, some elements have a composition range defined separately. Therefore, in the present specification, the term "unavoidable impurities" is a concept excluding elements that separately define the composition ranges thereof.
As unavoidable impurities, mn, si, etc., are mentioned, and the simple substance is preferably 0.05 mass% or less. The amount of unavoidable impurities is preferably 0.20 mass% or less based on the total amount.
The aluminum alloy extruded material according to the embodiment of the present invention is preferably such that the ratio of Zn content to Mg content (hereinafter, also referred to as "Zn/Mg mass ratio") is 2.92 to 9.12. Thereby, the yield strength can be made to be 260MPa or more. More preferably, the Zn/Mg mass ratio is 3.15 to 8.32. Thus, the yield strength can be made 270MPa or more.
< 2. Conductivity >
The aluminum alloy extruded material according to the embodiment of the present invention can be produced by a production method described below, and can have an electrical conductivity of 40.1 to 44.3% iacs. Also, "% IACS" is the international standard soft copper (resistivity 1.7241X 10) －8 Ω) was used as an indicator of 100%. In the present alloy system, it was found that the electrical conductivity decreases as the amount of Cr dissolved increases.
If the electrical conductivity is higher than 44.3% IACS, the stress corrosion cracking resistance is lowered. Although the exact mechanism is not yet clear, it is estimated that the solid solution amount of Cr is insufficient and the sensitivity to stress corrosion cracking is high when the electrical conductivity is higher than 44.3% IACS. The conductivity is preferably 43.7% IACS or less, more preferably 43.4% IACS or less.
On the other hand, the lower limit of the conductivity is not particularly limited, and more detailed production conditions need to be set so that the conductivity is lower than 40.1% iacs while the Cr content is set to 0.160 mass% or less, and in view of productivity, it is preferable that the conductivity is set to 40.1% iacs or more. More preferably, the conductivity is 40.9% IACS or more, and still more preferably 41.3% IACS or more.
In an embodiment of the present invention, the resistivity can be measured by inducing an eddy current in the sample using a sigma tester, and the conductivity (IACS conductivity) is obtained by dividing the resistivity of standard copper at 20 ℃ by the resistivity of the measured sample, expressed as a percentage.
< 3. Manufacturing method >)
Fig. 3 schematically shows an example of a temperature change process in the method for producing an aluminum alloy extruded material according to the embodiment of the present invention. The method for producing an aluminum alloy extruded material according to an embodiment of the present invention comprises the steps of: a step of heating the blank having the above composition to 450 to 550 ℃; (b) Cooling to 300 ℃ or lower at an average cooling rate of 90 ℃/hour or more; (c) Heating to 470 ℃ or higher to perform extrusion processing; (d) a quenching step. In the latter half of step (c) in fig. 3, the temperature is raised in the upper right direction in consideration of the heat release during extrusion, but the upper right direction is not necessarily required. The following steps are explained.
[ (a) heating to 450-550℃ ]
For homogenization, the billets having the above composition are heated to 450-550 ℃. Thus, for example, strength-improving elements such as Zn and Mg can be dispersed, and Cr can be dissolved in the Al matrix. If the heating temperature is outside the above range, for example, the yield strength cannot be sufficiently ensured, and Cr cannot be dissolved in the Al matrix. The heating temperature is preferably 490 ℃ or higher, more preferably 500 ℃ or higher, and still more preferably 510 ℃ or higher. Also, the heating temperature can be measured by installing a thermocouple on the billet in the heating furnace. The heating time is not particularly limited, and may be, for example, 1 hour or more.
[ (b) cooling to 300 ℃ or lower at an average cooling rate of 90 ℃/hr or more ]
After the step (a), the preform is cooled to 300 ℃ or lower at an average cooling rate of 90 ℃/hour or higher. If the average cooling rate is less than 90 ℃/hr, cr is precipitated in the ingot in solid solution, the amount of Cr in solid solution decreases, and the stress corrosion cracking resistance decreases. The average cooling rate is preferably 200 ℃/hr or more, more preferably 400 ℃/hr or more. The average cooling rate can be measured by dividing the difference between the blank heating temperature measured by the thermocouple and 300 ℃ after cooling by the time taken for cooling from the heating temperature to 300 ℃.
[ (c) the step of extruding by reheating to 470 ℃ or higher ]
After the step (b), the mixture is heated to 470 ℃ or higher to perform extrusion processing. When the reheating temperature is lower than 470 ℃, cr is precipitated in the ingot in solid solution, the amount of Cr in solid solution decreases, and the stress corrosion cracking resistance decreases. The temperature at the time of reheating can be measured by attaching a thermocouple to the preform. The die temperature and the container temperature during the extrusion process are preferably heated to 400 ℃ or higher so that the reheating temperature can be maintained during the extrusion process. The conditions of the extrusion process are not particularly limited, and for example, the extrusion ratio may be 10 or more and the extrusion speed may be 1 m/min or more. The shape of the extruded material after extrusion processing is not particularly limited either.
[ (d) quenching step ]
After the step (c), quenching is performed by a known method in order to secure a predetermined strength and to suppress Cr precipitation. For example, quenching can be performed by air cooling, water cooling, spraying, or the like.
The method for producing an aluminum alloy extruded material according to the embodiment of the present invention may include other steps (for example, an artificial aging step performed after step (d)) in addition to achieving the object of the present invention.
The inventors of the present invention found that Cr can be dissolved in Al matrix by the above-mentioned production method, and in this case, cr content, electrical conductivity and stress corrosion cracking resistance are closely related. Fig. 1 shows the correspondence relationship between Cr content and electric conductivity when an aluminum alloy extruded material is produced by the above production method. The hatched area in fig. 1 represents the area with conductivity of 40.1 to 44.3% iacs. In fig. 1, it is seen that the electrical conductivity decreases with an increase in Cr content, and the electrical conductivity is 40.1 to 44.3% iacs by making the Cr content 0.050 to 0.160 mass%.
Fig. 2 shows the correspondence between Cr content and crack life (specifically, the time until crack occurrence when the aluminum alloy extruded material is kept in a chromic acid boiling solution for 10 hours or more after being subjected to a higher stress (100% of yield strength) at 3-point bending in a stress corrosion cracking resistance test) when the aluminum alloy extruded material is produced by the above production method. The hatched area in fig. 2 shows an area where the crack life is 10 hours or longer. As is clear from fig. 2, when the Cr content is 0.050 to 0.160 mass%, the crack life is 10 hours or longer, and the stress corrosion cracking resistance can be improved. When the Cr content was less than 0.050 mass%, the crack life was found to be less than 10 hours. This is considered because, if the amount of Cr solid solution is small, the sensitivity to stress corrosion cracking is high. In addition, when the Cr content is more than 0.160 mass%, the crack life is less than 10 hours. This is because, when the Cr content is higher than 0.160 mass%, the precipitation of the intermetallic compound of Cr starts (although the conductivity is low, the Cr solid solution amount is large). It is also clear from FIG. 2 that the stress corrosion cracking resistance can be further improved by setting the Cr content to 0.063 to 0.135 mass% and the crack life to 12.5 hours or longer, and that the stress corrosion cracking resistance can be further improved by setting the Cr content to 0.070 to 0.120 mass% and the crack life to 14 hours or longer.
Preferably, the aluminum alloy extruded material according to the embodiment of the present invention can have a yield strength of 260MPa or more by a general artificial aging treatment. More preferably, the yield strength can be 270MPa or more. The tensile strength after the ordinary artificial aging is preferably 330MPa or more, and the elongation after the ordinary artificial aging is preferably 10% or more, more preferably 11% or more.
Examples
Hereinafter, embodiments of the present invention will be described more specifically with reference to examples. The embodiments of the present invention are not limited to the following examples, and may be modified and implemented as appropriate within the scope of the foregoing and the following objects, and these are included in the technical scope of the embodiments of the present invention.
An aluminum alloy ingot having a composition shown in Table 1 was cast and heated to 470 ℃. The heating time at 470℃was 6 hours. Thereafter, the mixture was air-cooled to room temperature (about 25 ℃) at an average cooling rate of 90℃per hour or more. Thereafter, the billet was heated to 480℃again, and extrusion was performed at a die temperature of 450℃and a container temperature of 450℃at an extrusion ratio of 60.9 and an extrusion speed of 4 m/min, so that the billet had a flat plate with a cross-sectional shape of 3mm thick and 110mm wide. Thereafter, quenching was performed by air cooling.
Thereafter, as an artificial aging treatment, a heat treatment under T7 conditions of a general 7000-series aluminum alloy, that is, a heat treatment at 70 ℃ x 5 hours+165 ℃ x 6 hours was performed. The obtained aluminum alloy extrudate was subjected to a tensile test, a stress corrosion cracking resistance test and a conductivity measurement as shown below.
In table 1, "Tr." is an abbreviation for Trace (Trace), and means a Trace amount, for example, may be 0.01 mass% or less.
[ Table 1 ]
< tensile test >)
2 test pieces of JIS13B were cut out from each of the aluminum alloy extruded materials in such a manner that the tensile direction was parallel to the extrusion direction (L direction), and tensile test was performed according to the metallic material test method defined in JIS Z2241 to measure the tensile strength, yield strength and elongation.
< test of stress corrosion cracking resistance (chromic acid accelerated test) >
The aluminum alloy extrudate is stressed by 3-point bending. The stress loading direction was the transverse direction (LT direction), and the loading stress level was 100% with respect to the yield strength after each artificial aging treatment. Thereafter, each of the 2 test pieces was immersed in a boiling chromic acid solution, and visual observation was performed every 2 hours for 16 hours, and the longest time during which no crack occurred was taken as the crack life.
< conductivity measurement >)
The electrical conductivity (IACS conductivity) of the aluminum alloy extrudate was measured using a sigma tester. Specifically, the electrical conductivity of each aluminum alloy extrudate was measured 3 times in a room temperature environment, and the average value thereof was used.
The results of each test are shown in table 2. In the stress corrosion cracking resistance test, no cracks were observed after 16 hours, and the term "16" was used in the column of crack life.
[ Table 2 ]
The results of table 2 can be examined as follows. Test nos. 1 and 2 in table 2 each satisfy the requirements specified in the embodiments of the present invention, and the crack life is at least 10 hours or more, and the stress corrosion cracking resistance is improved.
On the other hand, test nos. 3 to 5 in table 2 do not satisfy the requirements (Cr content 0.050 to 0.160 mass% and conductivity 40.1 to 44.3% iacs) specified in the embodiment of the present invention, and the crack life is less than 10 hours.
The present application is accompanied by the claims of Japanese patent application No. 2021-106946, whose filing date is 2021, 6 and 28. Japanese patent application No. 2021-106946 is incorporated by reference.
Claim (modification according to treaty 19)
1. An aluminum alloy extrusion material comprises the following components in percentage by weight,
zn:3.0 to 6.0 mass percent,
Mg:0.4 to 1.4 mass percent,
Fe:0.05 to 0.2 mass percent,
Cu:0.05 to 0.4 mass percent,
Ti: 0.005-0.2 mass%,
Zr:0.1 to 0.3 mass percent,
Cr:0.050 to 0.160 mass%
The balance: contains Al and unavoidable impurities as well as impurities,
the conductivity is 40.1-44.3% IACS.
2. The aluminum alloy extruded material according to claim 1, wherein the content of Cr is 0.070 to 0.120 mass%.
3. A method for producing the aluminum alloy extruded material according to claim 1 or 2, comprising the steps of:
a step of preparing a material having a composition,
zn:3.0 to 6.0 mass percent,
Mg:0.4 to 1.4 mass percent,
Fe:0.05 to 0.2 mass percent,
Cu:0.05 to 0.4 mass percent,
Ti: 0.005-0.2 mass%,
Zr:0.1 to 0.3 mass percent,
Cr:0.050 to 0.160 mass%
The balance: contains Al and unavoidable impurities;
heating the blank to 450-550 ℃;
cooling the heated billet to 300 ℃ or lower at an average cooling rate of 90 ℃/hour or more;
a step of reheating the cooled billet to 470 ℃ or higher to perform extrusion processing;
and quenching the extruded billet.
Claims (3)
1. An aluminum alloy extrusion material comprises the following components in percentage by weight,
zn:3.0 to 6.0 mass percent,
Mg:0.4 to 1.4 mass percent,
Fe:0.05 to 0.2 mass percent,
Cu:0.05 to 0.4 mass percent,
Ti: 0.005-0.2 mass%,
Zr:0.1 to 0.3 mass percent,
Cr:0.050 to 0.160 mass%
The balance: contains Al and unavoidable impurities as well as impurities,
the conductivity is 40.1-44.3% IACS.
2. The aluminum alloy extruded material according to claim 1, wherein the content of Cr is 0.070 to 0.120 mass%.
3. A method of producing the aluminum alloy extruded material according to claim 1 or 2, comprising the steps of:
a step of preparing a material having a composition,
zn:3.0 to 6.0 mass percent,
Mg:0.4 to 1.4 mass percent,
Fe:0.05 to 0.2 mass percent,
Cu:0.05 to 0.4 mass percent,
Ti: 0.005-0.2 mass%,
Zr:0.1 to 0.3 mass percent,
Cr:0.05 to 0.15 mass percent
The balance: contains Al and unavoidable impurities;
heating the blank to 450-550 ℃;
cooling the heated billet to 300 ℃ or lower at an average cooling rate of 90 ℃/hour or more;
a step of reheating the cooled billet to 470 ℃ or higher to perform extrusion processing;
and quenching the extruded billet.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021106946A JP7140892B1 (en) | 2021-06-28 | 2021-06-28 | Aluminum alloy extruded material and manufacturing method thereof |
| JP2021-106946 | 2021-06-28 | ||
| PCT/JP2022/021574 WO2023276504A1 (en) | 2021-06-28 | 2022-05-26 | Aluminum alloy extruded material and method for manufacturing same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117500950A true CN117500950A (en) | 2024-02-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280043632.9A Pending CN117500950A (en) | 2021-06-28 | 2022-05-26 | Aluminum alloy extruded material and method for producing same |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP4350021A1 (en) |
| JP (1) | JP7140892B1 (en) |
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| CN (1) | CN117500950A (en) |
| WO (1) | WO2023276504A1 (en) |
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| JP3681822B2 (en) | 1996-07-17 | 2005-08-10 | 古河スカイ株式会社 | Al-Zn-Mg alloy extruded material and method for producing the same |
| FR2846669B1 (en) * | 2002-11-06 | 2005-07-22 | Pechiney Rhenalu | PROCESS FOR THE SIMPLIFIED MANUFACTURE OF LAMINATED PRODUCTS OF A1-Zn-Mg ALLOYS AND PRODUCTS OBTAINED THEREBY |
| JP4764636B2 (en) * | 2005-01-05 | 2011-09-07 | 古河スカイ株式会社 | Compact structural parts with excellent impact formability using Al-Mg-Zn alloy |
| JP5276341B2 (en) * | 2008-03-18 | 2013-08-28 | 株式会社神戸製鋼所 | Aluminum alloy material for high pressure gas containers with excellent hydrogen embrittlement resistance |
| JP6193808B2 (en) * | 2014-05-22 | 2017-09-06 | 株式会社神戸製鋼所 | Aluminum alloy extruded material and method for producing the same |
| JP6873958B2 (en) | 2018-09-24 | 2021-05-19 | 株式会社藤商事 | Pachinko machine |
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| JP2023005182A (en) | 2023-01-18 |
| EP4350021A1 (en) | 2024-04-10 |
| JP7140892B1 (en) | 2022-09-21 |
| KR20240022570A (en) | 2024-02-20 |
| WO2023276504A1 (en) | 2023-01-05 |
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