CN109295363A - 7 line aluminium alloys of one kind and preparation method thereof - Google Patents
7 line aluminium alloys of one kind and preparation method thereof Download PDFInfo
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- CN109295363A CN109295363A CN201811531886.7A CN201811531886A CN109295363A CN 109295363 A CN109295363 A CN 109295363A CN 201811531886 A CN201811531886 A CN 201811531886A CN 109295363 A CN109295363 A CN 109295363A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- 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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Abstract
The present invention relates to 7 line aluminium alloys and preparation method thereof, 7 line aluminium alloy, be grouped as by the group of following weight percentage: 1.95-2.2% magnesium, the silicon of 0.04-0.1%, the iron of 0.04-0.06%, 0.15-0.33% copper, 0.023-0.028% titanium, 5.68-6.05% zinc, the manganese of 0.16-0.26% and 0.02-0.05% zirconium, surplus is aluminium.It is 470 or more that 7 line aluminium alloys of the invention, which have tensile strength, and yield strength is 440 or more, and vickers hardness hv is 160 or more and good fracture toughness and the advantages of fatigue resistance.
Description
Technical field
The present invention relates to aluminium alloy technology, feature is related to 7 line aluminium alloys of one kind and preparation method thereof.
Background technique
Aluminium alloy is added alloying elements by fine aluminium and is made, and the Al-Mn that manganese element is developed is added such as in fine aluminium
Alloy adds copper in fine aluminium and develops made of Al-Cu alloy, in fine aluminium while adding copper and magnesium elements develop Al-Cu-
Mg system duralumin, hard alumin ium alloy, adding zinc, magnesium, copper develops Al-Zn-Mg-Cu 7 series extra super duralumin alloy etc. simultaneously in fine aluminium.Aluminium closes
The feature of gold is light, intensity height, good heat dissipation, good hand touch and easy anode oxidation coloration.Under same intensity requirement, aluminium alloy
Components can be made thinner and light than plastics, while being also able to satisfy the Highgrade integration of 3C Product, lightening, micromation, resisting
Fall the requirement for hitting electromagnetic shielding and heat dissipation.The information technoloy equipments such as mobile phone, tablet computer, laptop on the market use now
Aluminium alloy is commonly 6 line aluminium alloys, with the development of science and technology 6 traditional wrought aluminium alloys have been difficult to meet in terms of intensity
The requirement of high-end product is especially bent in resistance to deformation, and in terms of the indexs such as anti-drop deformation, 6 be that wrought aluminium alloy and 7 deformation aluminium close
Metallographic is poor away from larger.Consumer's idea constantly changes and starts to pursue 7 line aluminium alloys.It is aluminium that 7 line aluminium alloys, which possess 6,
The characteristics of alloy, and intensity is higher than 6 line aluminium alloys.
In the prior art, although having there is more 7 line aluminium alloy product, have compared with the better mechanics of 6 line aluminium alloys
Performance, still, in order to meet the higher market demand, mechanical property, corrosion resistance, the fracture toughness of existing 7 line aluminium alloy
And improve in terms of fatigue resistance there is still a need for further.
Summary of the invention
The technical problems to be solved by the present invention are: providing the 7 of a kind of mechanical property that can further improve alloy is aluminium
Alloy and preparation method thereof.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows:
A kind of 7 line aluminium alloys, are grouped as by the group of following weight percentage: 1.95-2.2% magnesium, 0.04-0.1% silicon,
0.05% iron, 0.15-0.33% copper, 0.025% titanium, 5.68-6.05% zinc, 0.16-0.26% manganese and 0.02-0.05%
Zirconium, surplus is aluminium.
A kind of preparation method of 7 line aluminium alloy, according to the component of 7 above-mentioned line aluminium alloys successively carry out ingredient, fusing and
Stirring, and the intermediate alloy containing cerium that weight percent is 0.01-0.015% is added, obtain the first melt；By described
One melt successively carries out first time refining, skims and stand for the first time for the first time, and the first melt after first time is stood carries out
Isothermal holding obtains the second melt；Second melt is successively carried out to second to refine, skim for the second time and stand for the second time, is obtained
Obtain third melt；Online vacuum degassing, plate-type filtering and tubular filter purified treatment are successively carried out to third melt, then in liquid
Cave temperature uses semicontinuous oil gas to slide into capable casting under the conditions of being 670-690 DEG C, then successively carries out homogenization and cooling treatment, obtains
To 7 line aluminium alloy.
The beneficial effects of the present invention are:
(1) 7 line aluminium alloys of the invention improve Mg and Zn content, magnesium iron fortified phase can be improved in its component, into
And mechanical property is improved, after tested, the tensile strength for 7 line aluminium alloys that the present invention obtains is 470 or more, yield strength 440
More than, vickers hardness hv is 160 or more；
(2) Cu, Zr and Mn that above-mentioned weight percentage appropriate is added in component, can improve intensity and corrosion resistance
(Peeling Corrosion) makes 7 line aluminium alloys obtained have good fracture toughness and fatigue resistance；
(3) addition of the Mn and Cu in component also function to the volume effect for promoting crystal grain refinement simultaneously, can get mean intercept
Crystal grain≤60 μm；
(4) intermediate alloy containing cerium is added in component, cerium accounts for the 10% of intermediate alloy content, it is strong can to increase product
Degree, corrosion resistance improve product and squeeze temperature (temperature can improve product hardening heat after improving, it can straight to 560 DEG C
Connect and improve product hardness), it also can avoid product material in CNC process and be detached from；
(5) 7 line aluminium alloys of the invention, performance is so as to be applied to cell phone appearance alumiaum article, and meet outer
Bloom and sandblasting anode effect are seen, while can also realize the appearance of different colours on appearance member.
Detailed description of the invention
Fig. 1 is that coarse-grain layer of the 7 line aluminium alloy cross sections of the embodiment of the present invention one under 50X microscope observes photo；
Fig. 2 is grain size photo of the entire cross section of 7 line aluminium alloys of the embodiment of the present invention one under 50X microscope；
Fig. 3 be the embodiment of the present invention one 7 line aluminium alloy longitudinal surfaces under 50X microscope grain size photo；
Fig. 4 be the embodiment of the present invention one 7 line aluminium alloy longitudinal surfaces under 500X microscope precipitated phase photo；
Fig. 5 is that coarse-grain layer of the 7 line aluminium alloy cross sections of the embodiment of the present invention two under 50X microscope observes photo；
Fig. 6 is grain size photo of the entire cross section of 7 line aluminium alloys of the embodiment of the present invention two under 50X microscope；
Fig. 7 be the embodiment of the present invention two 7 line aluminium alloy longitudinal surfaces under 50X microscope grain size photo；
Fig. 8 be the embodiment of the present invention two 7 line aluminium alloy longitudinal surfaces under 500X microscope precipitated phase photo；
Fig. 9 is that coarse-grain layer of the 7 line aluminium alloy cross sections of the embodiment of the present invention three under 50X microscope observes photo；
Figure 10 is grain size photo of the entire cross section of 7 line aluminium alloys of the embodiment of the present invention three under 50X microscope；
Figure 11 be the embodiment of the present invention three 7 line aluminium alloy longitudinal surfaces under 50X microscope grain size photo；
Figure 12 be the embodiment of the present invention three 7 line aluminium alloy longitudinal surfaces under 500X microscope precipitated phase photo.
Specific embodiment
To explain the technical content, the achieved purpose and the effect of the present invention in detail, below in conjunction with embodiment and cooperate attached
Figure is explained.
The most critical design of the present invention is: improving Mg and Zn content, and Cu, Zr and Mn appropriate are added, to improve
Magnesium iron fortified phase.
The present invention relates to a kind of 7 line aluminium alloys, are grouped as by the group of following weight percentage: 1.95-2.2% magnesium, 0.04-
Iron, 0.15-0.33% copper, 0.023-0.028% titanium, the 5.68-6.05% zinc, 0.16- of 0.1% silicon, 0.04-0.06%
0.26% manganese and the zirconium of 0.02-0.05%, surplus are aluminium.
A kind of preparation method of 7 line aluminium alloy, according to the component of 7 above-mentioned line aluminium alloys successively carry out ingredient, fusing and
Stirring, and the intermediate alloy containing cerium that weight percent is 0.01-0.015% is added, obtain the first melt；By described
One melt successively carries out first time refining, skims and stand for the first time for the first time, and the first melt after first time is stood carries out
Isothermal holding obtains the second melt；Second melt is successively carried out to second to refine, skim for the second time and stand for the second time, is obtained
Obtain third melt；Online vacuum degassing, plate-type filtering and tubular filter purified treatment are successively carried out to third melt, then in liquid
Cave temperature uses semicontinuous oil gas to slide into capable casting under the conditions of being 670-690 DEG C, then successively carries out homogenization and cooling treatment, obtains
To 7 line aluminium alloy.
As can be seen from the above description, the beneficial effects of the present invention are:
(1) 7 line aluminium alloys of the invention improve Mg and Zn content, magnesium iron fortified phase can be improved in its component, into
And mechanical property is improved, after tested, the tensile strength for 7 line aluminium alloys that the present invention obtains is 470 or more, yield strength 440
More than, vickers hardness hv is 160 or more；
(2) Cu, Zr and Mn that above-mentioned weight percentage appropriate is added in component, can improve intensity and corrosion resistance
(Peeling Corrosion) makes 7 line aluminium alloys obtained have good fracture toughness and fatigue resistance；
(3) addition of the Mn and Cu in component also function to the volume effect for promoting crystal grain refinement simultaneously, can get mean intercept
Crystal grain≤60 μm；
(4) intermediate alloy containing cerium is added in component, cerium accounts for the 10% of intermediate alloy content, it is strong can to increase product
Degree, corrosion resistance improve product and squeeze temperature (temperature can improve product hardening heat after improving, it can straight to 560 DEG C
Connect and improve product hardness), it also can avoid product material in CNC process and be detached from；
(5) 7 line aluminium alloys of the invention, performance is so as to be applied to cell phone appearance alumiaum article, and meet outer
Bloom and sandblasting anode effect are seen, while can also realize the appearance of different colours on appearance member.
Further, the content of iron is 0.05%, and the content of titanium is 0.025%.
Further, be grouped as by the group of following weight percentage: 0.98-2.1% magnesium, 0.06-0.08% silicon,
0.05% iron, 0.21-0.31% copper, 0.025% titanium, 5.86-5.95% zinc, 0.19-0.21% manganese and 0.03-0.04%
Zirconium, surplus is aluminium.
Further, the content of the total impurities element of 7 line aluminium alloy is lower than 0.05%, the list of 7 line aluminium alloy
The content of a impurity element is not higher than 0.01%.
In the preparation method of 7 line aluminium alloys of the invention,
Further, the Homogenization Treatments include homogenization heat treatment for the first time and second of homogenization heat treatment, institute
State homogenization heat treatment for the first time specifically: 2.5-3.5h is kept the temperature under the conditions of 350-380 DEG C；At second of homogenization heat
Reason specifically: 15-16h is kept the temperature under the conditions of 490-520 DEG C.
Further, cooling treatment is stated specifically: cooled down using the intensity of cooling greater than 360 DEG C/h, until cooling
To room temperature.
Further, it in the cooling treatment, is carried out in such a way that water mist is cooling.
The embodiment of the present invention one are as follows:
7 line aluminium alloys of the present embodiment, are grouped as by the group of following weight percentage: 1.95% magnesium, 0.04% silicon,
0.04% iron, 0.15% bronze medal, 0.023% titanium, 5.68% zinc, 0.16% manganese and 0.02% zirconium, surplus are aluminium.
The preparation method of 7 line aluminium alloys of the present embodiment, according to the component of 7 above-mentioned line aluminium alloys successively carry out ingredient,
Fusing and stirring, and the intermediate alloy containing cerium that weight percent is 0.01% is added, obtain the first melt；By described
One melt successively carries out first time refining, skims and stand for the first time for the first time, and the first melt after first time is stood carries out
Isothermal holding obtains the second melt；Second melt is successively carried out to second to refine, skim for the second time and stand for the second time, is obtained
Obtain third melt；Online vacuum degassing, plate-type filtering and tubular filter purified treatment are successively carried out to third melt, then in liquid
Cave temperature uses semicontinuous oil gas to slide into capable casting under the conditions of being 670 DEG C, then carries out stepped Homogenization Treatments, described equal
Homogenizing processing successively includes homogenization heat treatment for the first time and second of homogenization heat treatment, the first time homogenization heat treatment
Specifically: 2.5h is kept the temperature under the conditions of 350 DEG C；Second of homogenization heat treatment specifically: kept the temperature under the conditions of 490 DEG C
15h；After second of homogenization heat treatment, carried out in such a way that water mist is cooling, using the intensity of cooling greater than 365 DEG C/h cold
But, until being cooled to room temperature (23-30 DEG C)；Obtain 7 line aluminium alloys of the present embodiment.
The embodiment of the present invention two are as follows:
7 line aluminium alloys of the present embodiment, are grouped as by the group of following weight percentage: 2.2% magnesium, 0.1% silicon,
0.06% iron, 0.33% bronze medal, 0.028% titanium, 6.05% zinc, 0.26% manganese and 0.05% zirconium, surplus are aluminium.
The preparation method of 7 line aluminium alloys of the present embodiment, according to the component of 7 above-mentioned line aluminium alloys successively carry out ingredient,
Fusing and stirring, and the intermediate alloy containing cerium that weight percent is 0.015% is added, obtain the first melt；It will be described
First melt successively carries out first time refining, skims and stands for the first time for the first time, the first melt after first time is stood into
Row isothermal holding obtains the second melt；Second melt is successively carried out to second to refine, skim for the second time and stand for the second time,
Obtain third melt；Online vacuum degassing, plate-type filtering and tubular filter purified treatment are successively carried out to third melt, then in
Liquid cave temperature uses semicontinuous oil gas to slide into capable casting under the conditions of being 690 DEG C, then carries out stepped Homogenization Treatments, described
Homogenization Treatments successively include that homogenization is heat-treated for the first time and second of homogenization heat treatment, the first time homogenize at heat
Reason specifically: keep the temperature 3.5h under the conditions of 380 DEG C；Second of homogenization heat treatment specifically: kept the temperature under the conditions of 520 DEG C
16h；After second of homogenization heat treatment, carried out in such a way that water mist is cooling, using the intensity of cooling greater than 380 DEG C/h cold
But, until being cooled to room temperature；Obtain 7 line aluminium alloys of the present embodiment.
The embodiment of the present invention three are as follows:
7 line aluminium alloys of the present embodiment, are grouped as by the group of following weight percentage: 2% magnesium, 0.08% silicon,
0.05% iron, 0.25% bronze medal, 0.026% titanium, 5.85% zinc, 0.2% manganese and 0.04% zirconium, surplus are aluminium.
The preparation method of 7 line aluminium alloys of the present embodiment, according to the component of 7 above-mentioned line aluminium alloys successively carry out ingredient,
Fusing and stirring, and the intermediate alloy containing cerium that weight percent is 0.013% is added, obtain the first melt；It will be described
First melt successively carries out first time refining, skims and stands for the first time for the first time, the first melt after first time is stood into
Row isothermal holding obtains the second melt；Second melt is successively carried out to second to refine, skim for the second time and stand for the second time,
Obtain third melt；Online vacuum degassing, plate-type filtering and tubular filter purified treatment are successively carried out to third melt, then in
Liquid cave temperature uses semicontinuous oil gas to slide into capable casting under the conditions of being 680 DEG C, then carries out stepped Homogenization Treatments, described
Homogenization Treatments successively include that homogenization is heat-treated for the first time and second of homogenization heat treatment, the first time homogenize at heat
Reason specifically: keep the temperature 3h under the conditions of 360 DEG C；Second of homogenization heat treatment specifically: kept the temperature under the conditions of 515 DEG C
15.5h；After second of homogenization heat treatment, carried out in such a way that water mist is cooling, using the intensity of cooling greater than 400 DEG C/h
It is cooling, until being cooled to room temperature；Obtain 7 line aluminium alloys of the present embodiment.
Performance test
1,7 line aluminium alloys for obtaining embodiment one to embodiment three carry out examination of materials test, and specific test condition is such as
Under:
1.1 test temperatures/humidity: 23 ± 5 DEG C/40%-60%RH；
1.2 test items and specification:
Chemical analysis --- GB/T7999-2007,
Vickers hardness --- GB/T4340.1-2009,
Metallographic structure --- GB/T3246.1,
Tension test --- GB/T228.1-2010；
1.3 test equipments: direct reading emission spectrometer, metallographic microscope, Vickers and universal testing machine；
1.4 result
1.4.1 thick crystal layer thickness, grain size, crystal grain rank
Specifically refer to the following table 1.
Table 1
1.4.2 hardness (unit: HV)
Specifically refer to the following table 2.
Table 2
1.4.3 tension
Specifically refer to the following table 3.
Table 3
2,7 line aluminium alloys that embodiment one to embodiment three obtains are subjected to metallographic test respectively.
Specifically, carrying out above-mentioned gold using LEICA DMI3000M inverted metallurgic microscope according to the operating instruction of regulation
Phase study.Wherein, the operating instruction of specific metallographic test is for example following:
2.1 safety operation points for attention and special suggestion
2.1.1 it need to enhance your vigilance, take care when the sample sample preparation, operating sampling equipment with caution.
2.1.2 random or specified specimen sample, and produce the sample fraction in sample by related request and tested.
2.1.3 the sample taken is carried out into relevant mark to distinguish sample.
2.1.5 a certain amount of drop face is carried out to sample surfaces according to customer requirement to operate.
2.1.6 metallographic sand (from thick to thin), the flannelette of different model is selected to be polished test specimen, polished.
2.1.7 by the good test specimen of polishing grinding be put into metallographic microscope leica by amplification factor adjust to 500X into
The acquisition of row precipitated phase.
2.1.8 specimen sample is put into deployed corrosive liquid and is corroded.It is put on microscope and passes through after corrosion is good
100X or 50X observation sample crystal grain and Cai Tu simultaneously evaluate grain size.
2.1.9 microscope should be closed after the completion of testing and carries out mark label and the storage work of specimen sample.
2.1.10 it should be noted safety during test, wear related appliances for labor protection and operate with caution.
The metallographic test result figure of acquisition is referring to shown in Fig. 1-12；
The result shows that in Fig. 1,5,9, respectively correspond embodiment one to embodiment three 7 line aluminium alloys cross section in 50X
Metallographic microscope under microscope, it can be seen that without obvious coarse-grain layer in figure；Fig. 3,7,11 show embodiment one to embodiment respectively
Metallographic microscope of the longitudinal surface of three 7 line aluminium alloys under 50X microscope, it can be seen that small in grain size in figure, and crystal grain is uniform；
In Fig. 4,8,12, respectively correspond embodiment one to embodiment three 7 line aluminium alloys metallographic of the longitudinal surface under 500X microscope
Scheme, as can be seen that its precipitated phase is evenly distributed in figure, and precipitate size is small.
In conclusion 7 line aluminium alloy provided by the invention have tensile strength be 470 or more, yield strength be 440 with
On, vickers hardness hv is 160 or more and good fracture toughness and the advantages of fatigue resistance.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalents made by bright specification and accompanying drawing content are applied directly or indirectly in relevant technical field, similarly include
In scope of patent protection of the invention.
Claims (8)
1. a kind of 7 line aluminium alloys, which is characterized in that be grouped as by the group of following weight percentage: 1.95-2.2% magnesium, 0.04-
Iron, 0.15-0.33% copper, 0.023-0.028% titanium, the 5.68-6.05% zinc, 0.16- of 0.1% silicon, 0.04-0.06%
0.26% manganese and the zirconium of 0.02-0.05%, surplus are aluminium.
2. 7 line aluminium alloy according to claim 1, which is characterized in that the content of iron is 0.05%, and the content of titanium is
0.025%.
3. 7 line aluminium alloy according to claim 2, which is characterized in that be grouped as by the group of following weight percentage:
0.98-2.1% magnesium, the silicon of 0.06-0.08%, 0.05% iron, 0.21-0.31% copper, 0.025% titanium, 5.86-5.95%
The zirconium of zinc, the manganese of 0.19-0.21% and 0.03-0.04%, surplus are aluminium.
4. 7 line aluminium alloy according to claim 1, which is characterized in that the content of the total impurities element of 7 line aluminium alloy
Lower than 0.05%, the content of the single impurity element of 7 line aluminium alloy is not higher than 0.01%.
5. a kind of preparation method of 7 line aluminium alloys, which is characterized in that according to described in claim 1-4 any one 7 be that aluminium closes
The component of gold successively carries out ingredient, fusing and stirring, and it is 0.01-0.015% containing in cerium that weight percent, which is added,
Between alloy, obtain the first melt；First melt is successively subjected to first time refining, skims and stands for the first time for the first time,
The first melt after first time is stood carries out isothermal holding, obtains the second melt；Second melt is successively carried out to second of essence
Refining is skimmed for the second time and is stood for the second time, and third melt is obtained；Online vacuum degassing, board-like mistake are successively carried out to third melt
Filter and tubular filter purified treatment slide into capable casting using semicontinuous oil gas under the conditions of being then 670-690 DEG C in liquid cave temperature,
Homogenization and cooling treatment are successively carried out again, obtain 7 line aluminium alloy.
6. the preparation method of 7 line aluminium alloy according to claim 5, which is characterized in that the Homogenization Treatments include the
Primary homogenization heat treatment and second of homogenization heat treatment, the first time homogenization heat treatment specifically: in 350-380 DEG C
Under the conditions of keep the temperature 2.5-3.5h；Second of homogenization heat treatment specifically: 15-16h is kept the temperature under the conditions of 490-520 DEG C.
7. the preparation method of 7 line aluminium alloy according to claim 5, which is characterized in that the cooling treatment specifically: adopt
It is cooled down with the intensity of cooling greater than 360 DEG C/h, until being cooled to room temperature.
8. the preparation method of 7 line aluminium alloy according to claim 7, which is characterized in that in the cooling treatment, using water
The cooling mode of mist carries out.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113564434A (en) * | 2021-08-12 | 2021-10-29 | 四川福蓉科技股份公司 | 7-series aluminum alloy and preparation method thereof |
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| CN108165849A (en) * | 2017-12-08 | 2018-06-15 | 四川福蓉科技股份公司 | A kind of 7 line aluminium alloys and preparation method thereof |
| CN108179333A (en) * | 2017-12-29 | 2018-06-19 | 福建祥鑫股份有限公司 | A kind of press quenching high-performance extrusion forming aluminum alloy materials and preparation method thereof |
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| JPS61117244A (en) * | 1985-10-31 | 1986-06-04 | Taiho Kogyo Co Ltd | Sliding aluminum alloy |
| CN105220040A (en) * | 2015-11-19 | 2016-01-06 | 广东和胜工业铝材股份有限公司 | A kind of Al-Zn-Mg alloy and preparation method thereof and application |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113564434A (en) * | 2021-08-12 | 2021-10-29 | 四川福蓉科技股份公司 | 7-series aluminum alloy and preparation method thereof |
| CN113564434B (en) * | 2021-08-12 | 2022-03-22 | 四川福蓉科技股份公司 | 7-series aluminum alloy and preparation method thereof |
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