TW202120708A - Aluminum alloy material - Google Patents

Abstract

This aluminum alloy material contains 7.0-10.0% Mg (mass%; the same applies hereinafter) and not more than 0.1% Ca, with the remainder comprising aluminum and unavoidable impurities, and has a tensile strength of not less than 500 MPa and an elongation at break that is not less than 3% but less than 10%.

Description

Aluminum alloy

The present invention relates to a high-strength aluminum alloy material with suppressed strength anisotropy.

In recent years, in order to achieve higher strength and lighter weight, it is desired to use aluminum alloy materials in various products such as housings of electronic devices. By using higher-strength aluminum alloy materials, it is possible to reduce the amount of aluminum alloy materials while maintaining the strength of the product equal to the conventional one, so the weight of the product can be reduced.

Here, in terms of high-strength aluminum alloy materials, generally, 6000 series alloys, 7000 series alloys, and the like can be cited. However, the above-mentioned alloys are heat-treated alloys, and because the heat-treated alloys require solution treatment and an effective heat treatment step, they have the problem of low production efficiency. In addition, since the 7000 series alloy contains a large amount of zinc (Zn) and copper (Cu), there is a problem that corrosion is likely to occur depending on the use environment.

From the above viewpoint, a non-heat-treated aluminum alloy can be used. As a non-heat-treated aluminum alloy, the 5000 series alloy is typically the strongest type. 5000 series alloys generally have excellent corrosion resistance, and because there is no need for solution treatment and aging heat treatment, the production efficiency is high. In addition, by adding additional elements to the 5000 series alloys, the strength of 6000 series alloys can be achieved. Therefore, an aluminum alloy material has been proposed, which is a 5000 series aluminum alloy material containing 5 wt% or more of Mg as a main additive element (refer to Patent Documents 1 to 3).

[Prior Technical Literature] [Patent Literature] [Patent Document 1] Japanese Patent Publication No. 2007-186747 [Patent Document 2] Japanese Patent Publication No. 2001-98338 [Patent Document 3] Japanese Patent Application Publication No. 7-197170

[The problem is solved by the invention] In the aluminum alloy materials described in Patent Documents 1 to 3, the content of Mg is increased to 5% by weight or more in order to increase the strength. However, the strength anisotropy in aluminum alloy materials is not considered.

In an aluminum alloy material, if the strength anisotropy is strong, the rigidity and reliability in a specific direction in the final product may decrease. In addition, in the production process of products such as molding, for example, poor dimensional accuracy may occur. In particular, compared to an annealed aluminum alloy material (O material), an aluminum alloy material (H material) whose strength is increased by work hardening is more prone to the problem of strength anisotropy.

One aspect of the present invention is accomplished in order to solve the above-mentioned problems, and the object of one aspect of the present invention is to provide an aluminum alloy material, which can ensure high strength by controlling the metal structure and suppress the various directions of strength. opposite sex.

[Means to Solve the Problem] In order to solve the above-mentioned problems, the aluminum alloy material of one aspect of the present invention includes: magnesium (Mg): 7.0~10.0 mass%; calcium (Ca): 0.1 mass% or less; and the remaining part is composed of aluminum and inevitable impurities Wherein, the tensile strength of the aforementioned aluminum alloy material is 500 MPa or more, and the elongation at break is 3% or more and less than 10%.

[Efficacy of invention] According to one aspect of the present invention, it is possible to manufacture an aluminum alloy material that can ensure high strength and suppress strength anisotropy.

The present inventors conducted in-depth investigations and studies on the alloy composition and metal structure of a high-strength aluminum alloy material containing a large amount of magnesium (Mg) that can suppress the anisotropy of strength. As a result, it was found that by adjusting the alloy composition and manufacturing process, and appropriately controlling the metal structure, the strength anisotropy can be suppressed.

Hereinafter, the aluminum alloy material of the embodiment of the present invention will be described in detail. In addition, the aluminum alloy material of the present embodiment can be used for components that are required to have isotropic strength and strength, such as home appliances, buildings, structures, and conveyors. In addition, in the following description of the unit, "mass%" is abbreviated as "%".

(Elements necessary for aluminum alloy materials) [Mg] Magnesium (Mg) mainly exists as a solid solution element and has the effect of improving strength. By making the Mg content in the aluminum alloy 7.0% or more, the effect of increasing the strength can be sufficiently obtained.

However, if the Mg content in the aluminum alloy exceeds 10.0%, cracks may occur during hot rolling, which may make manufacturing difficult. Therefore, the Mg content in the aluminum alloy is preferably in the range of 7.5% or more and 9.0% or less, and more preferably in the range of 7.5% or more and 8.5% or less.

[Ca] Calcium (Ca) is mainly present in the aluminum alloy as a compound, and even if it is present in a small amount, it may cause cracks during hot working and may reduce workability. When the content of Ca in the aluminum alloy is 0.1% or less, cracking during hot working can be suppressed. The content of Ca in the aluminum alloy is preferably 0.05% or less.

(Elements optionally contained in aluminum alloy material) [Si] The silicon (Si) system mainly produces second-phase particles (for example, single Si, Al-Si-Fe-Mn compounds), and acts as a recrystallization nucleus generation site, thereby having the effect of making crystal particles finer . By setting the Si content in the aluminum alloy to 0.02% or more, the effect of making crystal particles finer can be obtained satisfactorily.

However, if the Si content in the aluminum alloy exceeds 0.3%, a large amount of coarse second phase particles may be generated and the elongation at break of the manufactured aluminum alloy material may decrease. Therefore, the Si content in the aluminum alloy is preferably in the range of 0.02% or more and 0.2% or less, and more preferably in the range of 0.02% or more and 0.15% or less.

[Fe] Iron (Fe) mainly exists as second-phase particles (Al-Fe-based compounds, etc.), and by acting as a recrystallization nucleus generation site, it has an effect of making crystal particles finer. By setting the Fe content in the aluminum alloy to 0.02% or more, the effect of making crystal particles finer can be obtained.

However, if the Fe content in the aluminum alloy exceeds 0.5%, a large amount of coarse second-phase particles may be generated and the elongation at break of the manufactured aluminum alloy material may decrease. Therefore, the Fe content in the aluminum alloy is preferably in the range of 0.02% to 0.25%, and more preferably in the range of 0.02% to 0.2%.

[Cu] Copper (Cu) mainly exists as a solid solution element and has the effect of improving strength. By setting the Cu content in the aluminum alloy to 0.05% or more, the effect of increasing the strength can be sufficiently obtained.

However, if the Cu content in the aluminum alloy exceeds 1.0%, cracks may occur during hot rolling, which may make manufacturing difficult. Therefore, the Cu content in the aluminum alloy is preferably in the range of 0.05% or more and 0.5% or less, and more preferably in the range of 0.10% or more and 0.3% or less.

[Mn] Manganese (Mn) mainly exists as second-phase particles (Al-Mn-based compounds, etc.), and by acting as a recrystallization nucleus generation site, it has the effect of making crystal particles finer. Specifically, by setting the Mn content in the aluminum alloy to 0.05% or more, the effect of making crystal particles finer can be sufficiently obtained.

However, if the Mn content in the aluminum alloy exceeds 1.0%, a large amount of coarse second phase particles may be generated and the elongation at break of the manufactured aluminum alloy material may decrease. Therefore, the Mn content in the aluminum alloy is preferably in the range of 0.1% to 0.5%, and more preferably in the range of 0.15% to 0.3%.

[Cr, V, Zr] Chromium (Cr), vanadium (V), and zirconium (Zr) mainly exist as second phase particles (Al-Fe-Mn series compounds, Al-Cr series compounds, Al-V series compounds, Al-Zr series compounds, etc.) , And by acting as a recrystallization nucleus generation site, it has the effect of making crystal particles finer. Specifically, by setting the Cr and V content in the aluminum alloy to 0.05% or more, or the Zr content to 0.02% or more, the effect of making crystal grains finer can be sufficiently obtained.

However, if the content of Cr and V in the aluminum alloy is greater than 0.3%, or the content of Zr is greater than 0.2%, a large amount of coarse second-phase particles may be generated and the elongation at break of the manufactured aluminum alloy may decrease.

Therefore, the content of Cr and V in the aluminum alloy is preferably 0.2% or less. In addition, the Zr content in the aluminum alloy is preferably 0.1%.

In addition, the content of Cr, V, and Zr in the aluminum alloy is not limited to the above, as long as at least any one of Cr, V, and Zr is contained in the aluminum alloy.

[Ti] Titanium (Ti) suppresses the growth of the solidified aluminum phase formed during casting to make the casting structure finer, and has the effect of suppressing defects such as cracks during casting. However, if the Ti content in the aluminum alloy is too large, the second phase particles may become coarser and the elongation at break of the manufactured aluminum alloy material may decrease.

Therefore, by making the Ti content in the aluminum alloy 0.2% or less, it is possible to suppress the decrease in the elongation at break of the aluminum alloy material produced. The Ti content in the aluminum alloy is preferably 0.1% or less. In addition to the above-mentioned elements, the remaining components in the aluminum alloy are basically aluminum (Al) and unavoidable impurities (unavoidable impurities).

(Tensile strength and elongation at break) In this embodiment, an aluminum alloy material (H material) with a tensile strength of 500 MPa or more and a breaking elongation of 3% can be produced by performing the manufacturing process described below for the aluminum alloy composed of the above-mentioned composition. Above and less than 10%. In this way, it is possible to prevent insufficient strength of the final product caused by the tensile strength of less than 500 MPa. In addition, it is possible to prevent defects such as cracks during processing of the final product caused by the elongation at break less than 3%.

In addition, the tensile strength of the aluminum alloy material is preferably 550 MPa or more. In addition, the elongation at break of the aluminum alloy material is preferably 5% or more and less than 10%.

(Intensity Anisotropy) As shown in Figure 1, in the plane formed by the rolling direction (final machining direction) and the plate width direction during the final rolling of a set of rolls 2, the aluminum alloy material 1 of this embodiment is stretched in the following directions The standard deviation of strength is set to 20 [MPa] or less: from the rolling direction to the 0° direction of the aforementioned plate width direction; from the rolling direction to the 45° direction of the aforementioned plate width direction; from the rolling direction to the aforementioned plate width direction 90° direction (board width direction). This is based on the consideration that if the standard deviation of the tensile strength is greater than 20 [MPa], the anisotropy of the strength will be too high, and the strength of the final product in a specific direction may decrease and the reliability may decrease. Here, the standard deviation of the tensile strength can be calculated by the formula (1) described later.

The standard deviation of the tensile strength of the aluminum alloy material 1 is preferably 15 [MPa] or less, more preferably 12 [MPa] or less.

(Collective organization) In the aluminum alloy material of this embodiment, the orientation density of {013}<100> and {011}<100> calculated using the crystal orientation distribution function (ODF: Crystallite Orientation Distribution Function) is set to 5 or less (for example, 1 or so). This system considers that if the orientation density of {013}<100> and {011}<100> is greater than 5, the anisotropy of the strength will become significant, and the strength of the final product in a specific direction may decrease.

In addition, in the aluminum alloy material of this embodiment, the orientation density of {011}<211> calculated using the crystal orientation distribution function (ODF) is set as the ratio divided by the orientation density of {112}<111> Above 0.4. This system takes into account that if the orientation density of {011}<211> is less than 0.4 times the orientation density of {112}<111>, the anisotropy of the strength will become significant, and the strength of the final product in a specific direction will decrease. Yu.

Here, the calculation method of the orientation density using the crystal orientation distribution function (ODF) will be described in detail. In this embodiment, for the aluminum alloy material to be manufactured, a three-dimensional orientation analysis method using the crystal orientation distribution function (ODF) is used (refer to the Journal of the Institute of Light Metals, 1992, Vol. 42, No. 6, No. 358~367 Page) to calculate the orientation density. First, an X-ray diffraction method is used to measure a cross section perpendicular to the processing direction (rolling direction) of the aluminum alloy material. At this time, in the range of the inclination angle of 15 degrees to 90 degrees, use the Schlz reflection method (refer to the Journal of the Society of Light Metals, 1983, Vol. 33, No. 4, pages 230 to 239). (111) plane, (220) plane and (200) plane incomplete partial point diagrams. Next, series expansion is performed to obtain the crystal orientation distribution function (ODF). Thereby, the orientation density of each orientation is calculated as a ratio to the orientation density of a standard sample having a random aggregate structure.

(Method of manufacturing aluminum alloy material) Next, the manufacturing method of the aluminum alloy material of this embodiment is demonstrated. The aluminum alloy material of this embodiment is manufactured in the following order: a casting step, a homogenization step, a hot rolling step, a cold rolling step, and an annealing step. This manufacturing step is just an example and is not limited to this.

First, in the casting step, a semi-continuous casting method such as a direct chill (DC, Direct Chill) casting method or a hot top (Hot Top) method is used to cast a slab (Slab). During the casting process, the casting speed is preferably 20 mm/min to 100 mm/min to prevent the formation of coarse second phase particles.

After the casting step is completed, a homogenization step is performed. The processing temperature is set to 400°C or more and 490°C or less. This is because if the treatment temperature is less than 400°C, there is a possibility that homogenization may not be performed sufficiently. In addition, if the treatment temperature is higher than 490°C, the remaining Al-Mg-based compound that has not been re-solubilized may melt, which may cause problems such as cracks during hot rolling. In addition, the second phase particles are excessively coarsened, and in the subsequent recrystallization process, crystal particles of a specific orientation will preferentially grow, so the anisotropy of strength may decrease.

In the homogenization step of this embodiment, a two-stage homogenization process can be applied. At this time, the processing temperature of the first stage is set to 400°C or more and 450°C or less. This is because if the processing temperature in the first stage is set to less than 400°C, there is a possibility that homogenization may not be sufficiently performed. In addition, if the treatment temperature in the first stage is higher than 450°C, the remaining Al-Mg-based compound that has not been re-solubilized may melt, which may cause problems such as cracks during hot rolling.

In addition, the treatment time of the first stage is set within the range of 5 hours or more and 20 hours or less. This is because if the treatment time of the first stage is less than 5 hours, the homogenization cannot be sufficiently performed. In addition, if the treatment time in the first stage is longer than 20 hours, productivity decreases. By appropriately setting the above-mentioned treatment temperature and treatment time to perform the first-stage homogenization treatment, the Al-Mg-based compound can be dissolved in a solid solution and further homogenized at a high temperature.

Next, the processing temperature of the second stage is set to 450°C or more and 490°C or less. This is because if the processing temperature of the second stage is set to less than 450°C, there is a possibility that the homogenization cannot be sufficiently performed. In addition, if the treatment temperature in the second stage is higher than 490°C, the oxidation of surface Mg will continue, and the Mg concentration of the surface layer may decrease.

In addition, the treatment time of the second stage is set within the range of 5 hours or more and 20 hours or less. This is because if the treatment time in the second stage is less than 5 hours, the homogenization cannot be sufficiently performed. In addition, if the treatment time of the second stage is longer than 20 hours, the particles of the second phase are excessively coarsened, and in the subsequent recrystallization process, crystal particles of a specific orientation will preferentially grow, so the anisotropy of strength is reduced. Yu.

Next, a hot rolling step is performed. In the hot rolling step, the start temperature of the hot rolling is set in the range of 350°C or more and 480°C or less. This is because if the hot rolling treatment temperature is less than 350°C, the deformation resistance may increase and rolling may become difficult. In addition, if the hot-rolling treatment temperature is higher than 480°C, the material may be partially melted and cracks may occur. In addition, it is also possible to omit the homogenization step and perform the hot rolling step.

Then, after the hot rolling step is finished, the cold rolling step is performed. In the cold rolling step, the degree of processing (the ratio of the thickness after processing to the thickness before processing) from the plate thickness when the hot rolling step is completed to the plate thickness when the cold rolling step is completed becomes 50% or more , Carry out the cold rolling step. The degree of processing can be 50% or more, and can be changed appropriately.

In addition, intermediate annealing may be performed before the cold rolling step or during the cold rolling step. Even in this case, the cold rolling step is performed so that the processing degree from the sheet thickness at the time of completion of intermediate annealing to the sheet thickness at the time of cold rolling becomes 50% or more. The treatment temperature of the intermediate annealing is preferably in the range of 300°C or more and 400°C or less. In addition, the holding time of the intermediate annealing is preferably in the range of 1 hour or more and 10 hours or less. This is because if the intermediate annealing is performed at a high temperature for a long time, the surface oxidation may progress, which may deteriorate the quality of the appearance.

According to the aluminum alloy material of the present embodiment described above, by adjusting the composition and manufacturing process of the aluminum alloy, and appropriately controlling the metal structure, it is possible to manufacture an aluminum alloy material that has high strength and can suppress the strength of all directions. opposite sex. In this way, it is possible to improve the manufacturability of the aluminum alloy material and the reliability of the final product.

[Example] Hereinafter, Example 1 of this embodiment will be described with reference to Table 1 and Table 2.

(Composition of aluminum alloy) Table 1 shows the composition of the aluminum alloy used in Example 1.

[Table 1] this invention Composition of aluminum alloy [wt%] Fe Si Cu Mn Mg Cr Ti V Zr Ca Al Example 1 0.22 0.10 ＜0.01 0.40 7.6 0.02 0.03 0.01 ＜0.01 ＜0.01 Stub

As shown in Table 1, the composition of the aluminum alloy of Example 1 is within the specified range. Here, the prescribed range refers to the range where Mg is 7.0 to 10.0% and Ca is 0.1% or less.

(Production method) After the aluminum alloy composed of the composition shown in Table 1 was melted and DC cast, the homogenization step, the hot rolling step, and the cold rolling step were performed. Next, the plate thickness of the aluminum alloy material after the cold rolling step is completed is 1.0 mm.

In Example 1, in the homogenization step before the hot rolling step, heating was performed at 465° C. for 12 hours (h). In the cold rolling step, the processing degree from the plate thickness when the hot rolling step is completed to the plate thickness when the cold rolling step is completed is 80%.

(Characteristics of aluminum alloy material) Regarding the aluminum alloy of Example 1 composed of the composition shown in Table 1, the strength characteristics, strength anisotropy, and manufacturability of the aluminum alloy material produced by applying the above-mentioned treatment are summarized in Table 2.

[Table 2] this invention Strength characteristics Anisotropy Manufacturability Tensile strength [MPa] Elongation at break [%] Anisotropy of strength [MPa] {013} <100> orientation density {011} <100> orientation density {011}<211>/{011}<100> Orientation density ratio Example 1 572 8 10 ○ ○ ○ ○

(Tensile strength and elongation at break) As shown in Table 2, the tensile strength and elongation at break of the aluminum alloy material manufactured in Example 1 are both within the specified range. In other words, the tensile strength of the aluminum alloy material manufactured in Example 1 is 500 MPa or more, and the elongation at break is in the range of 3% or more and less than 10%.

In addition, in accordance with JIS standard Z-2241-2011, the tensile strength and elongation at break of the manufactured aluminum alloy material were measured. As shown in Figure 1, the tensile strength and elongation at break of the manufactured aluminum alloy material 1 are in the plane formed by the rolling direction (final processing direction) and the plate width direction of a set of rolls 2, and the following directions are measured The above tensile strength and elongation at break are defined as the average value: 0° direction as the rolling direction; 45° direction formed by the 0° direction and the 45° direction from the rolling direction to the plate width direction ; From the rolling direction to the 90° direction formed by the aforementioned 0° direction and the aforementioned 90° direction in the width direction of the plate.

(Intensity Anisotropy) The anisotropy of strength is measured in the plane formed by the rolling direction (final processing direction) and the width direction of the plate, and the tensile strength in the following directions is measured, and the standard deviation [MPa] calculated by the following formula (1) is used to calculate Definition: 0° direction as the rolling direction; 45° direction formed by the aforementioned 0° direction and the aforementioned 45° direction from the rolling direction to the plate width direction; from the rolling direction to the aforementioned 0° direction of the plate width direction The 90° direction formed by the aforementioned 90° direction.

[Math 1]

Here, TS _i [MPa] represents the tensile strength in each direction. TS [MPa] represents the average value of the tensile strength in each direction. The n system represents the total number of data on tensile strength.

(Collective organization) The orientation density of the aluminum alloy material of Example 1 was calculated using the three-dimensional orientation analysis method using the crystal orientation distribution function (ODF). Specifically, with respect to a part of the aluminum alloy material to be manufactured, a cross section perpendicular to the processing direction (rolling direction) of the aluminum alloy material was measured using the X-ray diffraction method. At this time, within the range of the inclination angle of 15 degrees to 90 degrees, use the Schlz reflection method described above to measure the incomplete partial point maps of the (111) plane, the (220) plane, and the (200) plane; then , Carry out series expansion to obtain the crystal orientation distribution function (ODF).

The orientation density of each orientation thus obtained is calculated as a ratio to the orientation density of a standard sample having a random aggregate structure. Table 2 shows the evaluation results in which the orientation density of {013}<100> and {011}<100> is 5 or less marked as "○", and those greater than "5" are marked as "X". Also, the ratio of the orientation density of {011}<211> divided by the orientation density of {112}<111> (orientation density is 2) is 0.4 or more marked as "○", and less than 0.4 is marked as "X" .

As shown in Table 2, in Example 1, the anisotropy of strength can be suppressed satisfactorily. In addition, in Example 1, there were no manufacturability problems.

(Comparative example) As a comparative example of the above-mentioned Example 1, the characteristics of the aluminum alloy materials manufactured by applying the same treatment as in Example 1 with respect to the aluminum alloys of Comparative Examples 1 to 5 having the compositions shown in Table 3 are summarized in Table 4. Among them, in Comparative Examples 1 to 3, the homogenization treatment was performed at 500°C for 8 hours.

[table 3] Comparative example Composition of aluminum alloy [wt%] Fe Si Cu Mn Mg Cr Ti V Zr Ca Al Comparative example 1 0.16 0.07 0.08 ＜0.01 6.8 ＜0.01 0.01 ＜0.01 ＜0.01 ＜0.01 Stub Comparative example 2 0.16 0.07 0.08 0.24 6.7 ＜0.01 0.01 ＜0.01 ＜0.01 ＜0.01 Stub Comparative example 3 0.16 0.07 0.08 ＜0.01 5.7 0.20 0.01 ＜0.01 ＜0.01 ＜0.01 Stub Comparative example 4 0.16 0.07 0.08 ＜0.01 11.0 ＜0.01 0.01 ＜0.01 ＜0.01 ＜0.01 Stub Comparative example 5 0.16 0.07 0.08 ＜0.01 9.0 ＜0.01 0.01 ＜0.01 ＜0.01 0.50 Stub

[Table 4] Comparative example Strength characteristics Anisotropy Manufacturability Tensile strength [MPa] Elongation at break [%] Anisotropy of strength [MPa] {013} <100> orientation density {011}<100> Orientation density {011}<211>/{011}<100> Orientation density ratio Comparative example 1 470 9 12 ○ ○ ○ ○ Comparative example 2 487 9 twenty one ○ ○ X ○ Comparative example 3 478 8 15 ○ ○ ○ ○ Comparative example 4 - - - - - - X Comparative example 5 - - - - - - X

In Comparative Example 1, because Mg is too small, the tensile strength of the manufactured aluminum alloy material is less than the specified range, and therefore, good mechanical properties cannot be obtained.

In Comparative Example 2, because Mg is too small, the tensile strength of the manufactured aluminum alloy material is less than the specified range, and therefore, good mechanical properties cannot be obtained. In addition, because the homogenization treatment temperature is too high and the strength anisotropy is greater than the specified range, good mechanical properties cannot be obtained.

In Comparative Example 3, because Mg is too small, the tensile strength of the manufactured aluminum alloy material is less than the specified range, and therefore, good mechanical properties cannot be obtained.

In Comparative Example 4, because the content of Mg was too large, cracks occurred during hot rolling, and rolling became difficult and production was impossible.

In Comparative Example 5, because the content of Ca was too large, cracks occurred during hot rolling, and rolling became difficult and production was impossible.

In addition, the present invention is not limited to the above-mentioned embodiments and embodiments, and various modifications can be made within the scope shown in the claims, and embodiments obtained by appropriately combining the technical means disclosed in each of the various embodiments are also included. Within the technical scope of the present invention.

The aluminum alloy material of one aspect of the present invention includes: magnesium (Mg): 7.0 to 10.0 mass%; calcium (Ca): 0.1 mass% or less; and the remaining part is composed of aluminum and inevitable impurities; wherein, The tensile strength of the aforementioned aluminum alloy material is 500 MPa or more, and the elongation at break is 3% or more and less than 10%.

The aforementioned aluminum alloy material preferably contains: Manganese (Mn): 0.05 to 1.0% by mass.

In addition, in the plane formed by the final machining direction of the aluminum alloy material and the plate width direction, the standard deviation of the tensile strength of the aluminum alloy material in the following directions is preferably 20 or less: In the 0° direction; from the final machining direction to the 45° direction formed by the 0° direction and the 45° direction from the aforementioned final machining direction to the aforementioned plate width direction; from the aforementioned final machining direction to the aforementioned 90° direction and the aforementioned 90° direction from the aforementioned final machining direction to the aforementioned plate width direction The 90° direction formed by the ° direction.

For the aforementioned aluminum alloy material, the orientation density of {013}<100> and {011}<100> calculated using the crystal orientation distribution function (ODF) is preferably 5 or less.

For the aforementioned aluminum alloy material, the orientation density of {011}<211> calculated using the crystal orientation distribution function (ODF) is preferably 0.4 times or more the orientation density of {112}<111>.

1: Aluminum alloy material 2: roll

Fig. 1 is a diagram showing the direction of measurement of the tensile strength of the aluminum alloy material in this embodiment.

no.

Claims (5)

An aluminum alloy material, which contains: Magnesium (Mg): 7.0~10.0% by mass; Calcium (Ca): 0.1% by mass or less; and The rest is composed of aluminum and inevitable impurities; among them, The tensile strength of the aforementioned aluminum alloy material is 500 MPa or more, and the elongation at break is 3% or more and less than 10%. The aluminum alloy material according to claim 1, wherein the aluminum alloy material contains manganese (Mn): 0.05 to 1.0% by mass. The aluminum alloy material according to claim 1 or 2, wherein, in the plane formed by the final processing direction of the aluminum alloy material and the plate width direction, the standard deviation of the tensile strength of the aluminum alloy material in the following directions is 20 or less: in the 0° direction as the aforementioned final machining direction; from the aforementioned final machining direction to the 45° direction formed by the aforementioned 0° direction and the aforementioned 45° direction in the aforementioned plate width direction; from the aforementioned final machining direction to the aforementioned plate width The direction is the 90° direction formed by the aforementioned 0° direction and the aforementioned 90° direction. The aluminum alloy material according to claim 3, wherein, for the aluminum alloy material, the orientation density of {013}<100> and {011}<100> calculated using a crystal orientation distribution function (ODF) is 5 or less. The aluminum alloy material according to claim 3, wherein the orientation density of {011}<211> calculated using the crystal orientation distribution function (ODF) for the aforementioned aluminum alloy material is the orientation density of {112}<111> 0.4 times or more.

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