CN115948666A - Preparation method of Al-Zn-Mg series aluminum alloy containing Zr - Google Patents
Preparation method of Al-Zn-Mg series aluminum alloy containing Zr Download PDFInfo
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- CN115948666A CN115948666A CN202211211796.6A CN202211211796A CN115948666A CN 115948666 A CN115948666 A CN 115948666A CN 202211211796 A CN202211211796 A CN 202211211796A CN 115948666 A CN115948666 A CN 115948666A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 49
- 229910018571 Al—Zn—Mg Inorganic materials 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000000126 substance Substances 0.000 claims abstract description 19
- 238000001125 extrusion Methods 0.000 claims abstract description 13
- 238000001914 filtration Methods 0.000 claims description 22
- 238000005266 casting Methods 0.000 claims description 19
- 230000032683 aging Effects 0.000 claims description 18
- 239000000155 melt Substances 0.000 claims description 18
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- 239000000498 cooling water Substances 0.000 claims description 12
- 238000007872 degassing Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 8
- 230000035882 stress Effects 0.000 claims description 8
- 238000003723 Smelting Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 5
- 238000000265 homogenisation Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 230000001550 time effect Effects 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 229910052726 zirconium Inorganic materials 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 abstract description 21
- 239000000956 alloy Substances 0.000 abstract description 21
- 239000002245 particle Substances 0.000 abstract description 14
- 238000001953 recrystallisation Methods 0.000 abstract description 7
- 239000006185 dispersion Substances 0.000 abstract description 5
- 230000033001 locomotion Effects 0.000 abstract description 3
- 239000011159 matrix material Substances 0.000 abstract description 3
- 238000013508 migration Methods 0.000 abstract description 3
- 230000005012 migration Effects 0.000 abstract description 3
- 239000002244 precipitate Substances 0.000 abstract description 3
- 239000000758 substrate Substances 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 11
- 239000000047 product Substances 0.000 description 5
- 239000013078 crystal Substances 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910018464 Al—Mg—Si Inorganic materials 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000010407 anodic oxide Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013386 optimize process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- -1 smart phones Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
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Abstract
The invention discloses a preparation method of Al-Zn-Mg series aluminum alloy containing Zr; by optimizing the chemical components, the chemical component proportion and the process of the aluminum alloy, the Zr-containing Al-Zn-Mg aluminum alloy with remarkable yield strength, tensile strength and elongation can be obtained; after the application is optimized by combining with an extrusion process, the Zr-containing alloy precipitates a large amount of spherical Al with the particle diameter of about 30nm on a substrate 3 Zr particles. Al (Al) 3 Strong pinning site of Zr particle dispersion phaseThe dislocation movement and the obstruction of the migration of the subgrain boundary obviously inhibit the growth of the subgrain and the recrystallization of the matrix, and are beneficial to improving the strength of the alloy, so that the alloy has wider application field.
Description
Technical Field
The invention relates to the field of preparation of aluminum series aluminum alloy, in particular to a preparation method of Al-Zn-Mg series aluminum alloy containing Zr.
Background
With the rapid development of the consumer electronics industry, aluminum-based aluminum alloys are widely used in consumer electronics products such as smart phones, tablet computers, smart televisions, notebook computers and the like due to the characteristics of excellent anodic oxidation performance, low density, good heat conductivity, easy processing and the like. However, as electronic products are developed in a larger size and thinner direction, the strength of the conventional Al-Mg-Si aluminum alloy for anodic oxidation cannot meet the needs of industry development, and the higher strength 7xxx aluminum alloy attracts the attention of the industry.
Al-Zn-Mg series aluminum alloy is mostly adopted as 7xxx series aluminum alloy for electronic product appearance parts, but the Al-Zn-Mg series aluminum alloy is aging strengthening type aluminum alloy, and the comprehensive properties of the strength, the plastic toughness, the corrosion resistance and the damage resistance of the series aluminum alloy need to be further improved in the use process. In actual production, the components and technological parameters of the Al-Zn-Mg aluminum alloy have great influence on the performance of the Al-Zn-Mg aluminum alloy. In the prior art, the defects of solidification shrinkage, material lines of an anodic oxide film, heterochromatic lines and the like still exist, and the high-performance Al-Zn-Mg aluminum alloy for Zr-containing electronic products with both strength and appearance decoration cannot be considered.
The invention aims to provide the Al-Zn-Mg series aluminum alloy with high comprehensive performance aiming at the defects in the prior art, and the high comprehensive performance aluminum alloy with excellent comprehensive performance is obtained by regulating and controlling the elements and the proportion of the series aluminum alloy and optimizing the preparation process conditions.
Disclosure of Invention
Based on the above, in order to solve the problem that the Al-Zn-Mg series aluminum alloy for Zr-containing electronic products in the prior art cannot give consideration to both strength and high performance of appearance decoration, the invention provides a preparation method of the Al-Zn-Mg series aluminum alloy containing Zr, which comprises the following specific technical scheme:
a preparation method of Zr-containing Al-Zn-Mg series aluminum alloy comprises the following chemical components in percentage by mass:
5.05 to 5.10 percent of Zn, 1.04 to 1.12 percent of Mg, 0.22 to 0.24 percent of Cu0.06 to 0.07 percent of Fe, 0.04 to 0.05 percent of Si, 0.10 to 0.20 percent of Zr, less than 0.001 percent of Mn, less than 0.001 percent of Cr and the balance of Al;
the preparation method comprises the following steps:
preparing materials according to chemical components, mixing, smelting, degassing, filtering, cooling the melt to 600 ℃, casting, and homogenizing to obtain an ingot;
and extruding the cast ingot, and performing aging treatment to obtain the Al-Zn-Mg series aluminum alloy containing Zr.
Further, the temperature of the smelting treatment is 700-760 ℃.
Further, the degassing treatment is to introduce argon into the melt and stir, and the degassing time is 10min-15min.
Further, the filtration treatment is to carry out double-stage filtration on the melt, wherein the first stage filtration is greater than or equal to 30ppi, the second stage filtration is greater than or equal to 50ppi, and the melt temperature during filtration is within the range of 700-750 ℃.
Further, the casting speed is 45mm/min-50mm/min, the cooling water flow is 1200L/min-1500L/min, after casting for 1min-5min, the casting speed is adjusted to 60mm/min-75mm/min, the cooling water flow is 2500L/min-3000L/min, and the cooling water temperature is less than or equal to 35 ℃.
Further, the homogenization treatment is that the temperature is kept for 7.5 to 8.5 hours under the condition that the temperature is 520 to 550 ℃, and the water is rapidly cooled at the speed of 250 to 300 ℃/h after the furnace is taken out.
Further, the extrusion treatment temperature is 480-500 ℃, the extrusion speed is 4m/min, and the outlet temperature is not higher than 500 ℃.
Further, the aging treatment is a two-stage aging treatment, and comprises a first aging treatment and a second aging treatment.
Further, the first time effect treatment is carried out by applying tensile stress of 120MPa-150MPa, heating to 160-200 ℃, and preserving heat for 1h-2h, and the first time effect treatment is carried out by applying tensile stress of 200MPa-250MPa, heating to 220-280 ℃, preserving heat for 1h-3h, and then naturally cooling to room temperature.
10. The method according to claim 3, wherein the amount of argon is 4-5 m/h, the rotation speed of the rotor is 500-600 r/min, and the working pressure of the gas is 0.2-0.3 MPa.
By optimizing the chemical components, the chemical component proportion and the process of the aluminum alloy, the Zr-containing Al-Zn-Mg aluminum alloy with remarkable yield strength, tensile strength and elongation can be obtained; after the application is optimized by combining with an extrusion process, the Zr-containing alloy precipitates a large amount of spherical Al with the particle diameter of about 30nm on a substrate 3 Zr particles. Al (Al) 3 The Zr particle dispersion phase can strongly pin dislocation movement and hinder subgrain boundary migration, obviously inhibit subgrain growth and matrix recrystallization, and contribute to improving the strength of the alloy, so that the Zr particle dispersion phase has a wider application field.
Drawings
FIG. 1 is a schematic view of the internal structure of a Zr-containing Al-Zn-Mg series aluminum alloy produced in example 1;
FIG. 2 is a schematic view of the internal structure of the aluminum alloy prepared in comparative example 1;
FIG. 3 is a schematic view of the internal structure of the aluminum alloy prepared in comparative example 4;
fig. 4 is a schematic view of the internal structure of the aluminum alloy prepared in comparative example 5.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to embodiments thereof. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In an embodiment of the present invention, a method for preparing a Zr-containing Al-Zn-Mg series aluminum alloy includes the following chemical components by mass:
5.05 to 5.10 percent of Zn, 1.04 to 1.12 percent of Mg, 0.22 to 0.24 percent of Cu0.06 to 0.07 percent of Fe, 0.04 to 0.05 percent of Si, 0.10 to 0.20 percent of Zr, less than 0.001 percent of Mn, less than 0.001 percent of Cr and the balance of Al;
the preparation method comprises the following steps:
preparing materials according to chemical components, mixing, smelting, degassing, filtering, cooling the melt to 600 ℃, casting, and homogenizing to obtain an ingot;
and extruding the cast ingot, and performing aging treatment to obtain the Al-Zn-Mg series aluminum alloy containing Zr.
In one embodiment, the temperature of the smelting process is 700-760 ℃.
In one embodiment, the degassing treatment is to introduce argon into the melt and stir the melt, and the degassing time is 10min to 15min.
In one embodiment, the filtration treatment is a two-stage filtration of the melt, the first stage filtration is greater than or equal to 30ppi, the second stage filtration is greater than or equal to 50ppi, and the melt temperature during filtration is in the range of 700 ℃ to 750 ℃.
In one embodiment, the casting speed is 45mm/min-50mm/min, the cooling water flow is 1200L/min-1500L/min, after casting for 1min-5min, the casting speed is adjusted to be 60mm/min-75mm/min, the cooling water flow is 2500L/min-3000L/min, and the cooling water temperature is less than or equal to 35 ℃.
In one embodiment, the homogenization treatment is that the temperature is kept for 7.5h-8.5h under the condition that the temperature is 520-550 ℃, and the homogenization treatment is rapidly water-cooled at the rate of 250 ℃/h-300 ℃/h after the homogenization treatment is taken out of the furnace.
In one embodiment, the extrusion temperature is 480-500 ℃, the extrusion speed is 4m/min, and the outlet temperature is not higher than 500 ℃.
In one embodiment, the aging treatment is a double-stage aging treatment, and comprises a first aging treatment and a second aging treatment.
In one embodiment, the first time effect treatment is to apply tensile stress of 120MPa to 150MPa, heat the temperature to 160 ℃ to 200 ℃, and preserve heat for 1h to 2h, apply tensile stress of 200MPa to 250MPa, heat the temperature to 220 ℃ to 280 ℃, preserve heat for 1h to 3h, and then naturally cool the temperature to room temperature.
10. The method according to claim 3, wherein the amount of argon is 4-5 m/h, the rotation speed of the rotor is 500-600 r/min, and the working pressure of the gas is 0.2-0.3 MPa.
By optimizing the chemical components, the chemical component proportion and the process of the aluminum alloy, the Zr-containing Al-Zn-Mg aluminum alloy with remarkable yield strength, tensile strength and elongation can be obtained; after the application is optimized by combining with an extrusion process, the Zr-containing alloy precipitates a large amount of spherical Al with the particle diameter of about 30nm on a substrate 3 Zr particles. Al (Al) 3 The Zr particle dispersion phase can strongly pin dislocation motion and hinder the migration of subgrain boundaries, obviously inhibit the growth of subgrain and the recrystallization of a matrix, and is beneficial to improving the strength of the alloy, so that the Zr particle dispersion phase has wider application field.
Embodiments of the present invention will be described in detail below with reference to specific examples.
Examples 1 to 3:
the chemical components and the mixture ratio of the chemical components of examples 1 to 3 are different, and as shown in table 1, the preparation method is as follows:
a preparation method of Al-Zn-Mg series aluminum alloy containing Zr comprises the following steps:
preparing materials according to chemical components, mixing at 700-760 ℃ for smelting, then introducing argon into the melt according to the parameters that the using amount of the argon is 4-5 m/h, stirring under the conditions that the rotating speed of a rotor is 500-600 r/min and the working pressure of the gas is 0.2-0.3 MPa, degassing time is 10-15 min, continuously carrying out two-stage filtration on the melt, wherein the first-stage filtration is more than or equal to 30ppi, the second-stage filtration is more than or equal to 50ppi, the melt temperature is filtered within the range of 700-750 ℃ during filtration, casting is carried out after the melt temperature is reduced to 600 ℃, the casting speed is 45-50 mm/min, the cooling water flow is 1200-1500L/min, after casting is carried out for 1-5 min, the casting speed is adjusted to 60-75 mm/min, the cooling water flow is 2500L/min-3000L/min, the cooling water flow is 35 ℃ and is 520-550 ℃, heat preservation is carried out under the condition that the temperature is 7.5-5 h, and after ingot casting is carried out at the water cooling speed of 300 ℃/h, and then the ingot is carried out at the temperature of 300 ℃/h, and the water cooling speed is 300 ℃/h, so as to obtain the ingot casting speed of the ingot casting speed is carried out at the temperature of 300 ℃/h;
and (2) carrying out extrusion treatment on the cast ingot under the conditions that the temperature is 480-500 ℃, the extrusion speed is 4m/min and the outlet temperature is not higher than 500 ℃, then applying the tensile stress of 120-150 MPa to the first time effect treatment, heating to 160-200 ℃, preserving heat for 1-2 h, applying the tensile stress of 200-250 MPa, heating to 220-280 ℃, preserving heat for 1-3 h, and then naturally cooling to the room temperature to obtain the Zr-containing Al-Zn-Mg series aluminum alloy.
Comparative examples 1 to 3:
comparative examples 1 to 3 are different from example 3 in chemical components and chemical component ratios, and are specifically shown in table 1, and the others are the same as example 3.
Table 1:
examples 4 to 5 and comparative examples 4 to 5 differ from example 3 in the process, as shown in table 2.
Table 2:
the samples of examples 1 to 5 and comparative examples 1 to 5 were subjected to the performance test, and the results are shown in table 3 below.
Table 3:
as can be seen from the data analysis of Table 1, the chemical components, the chemical component proportions and the process in the application serve as a complete technical scheme, and the Zr-containing Al-Zn-Mg series aluminum alloy with yield strength, tensile strength and elongation rate meeting the use requirements can be obtained. The Al-Zn-Mg alloy is an aging strengthening type aluminum alloy, and the strength of the Al-Zn-Mg alloy is mainly determined by the morphology, distribution and size of precipitated phases in crystal and grain boundaries. In the aging process of the alloy, the more dispersed, uniform and fine the intragranular precipitated phase is, the stronger the dislocation resistance is, and the higher the strength is. Meanwhile, the 2# alloy containing Zr is caused by Al 3 Zr pins grain boundary, inhibits the recrystallization, and a large amount of fine subgrains exist in the alloy, so the mechanical property of the alloy is improved through the optimized process. Under the conditions of the extrusion temperature and the extrusion speed of the application, the alloy grain boundary precipitated phase is discontinuously distributed, almost no precipitate-free precipitated band exists, the size of the grain boundary precipitated phase is small and the distribution is uniform, and the alloy grain boundary precipitated phase has certain promotion effect on the strength and plasticity of the alloy; the precipitated phase in the crystal is finer, dispersed and uniform, and the aluminum alloy with better comprehensive mechanical property can be obtained.
As shown in FIG. 1 as an exampleFIG. 1 shows the internal structure of Zr-containing Al-Zn-Mg-based aluminum alloy prepared in 1, in which Zr element is contained, and a large amount of fine subgrain having a size of about 2 to 3 μm is present in the alloy. Zr element with Al 3 Zr particles are present in the form of spherical, approximately 30nm particle size, precisely due to the Al content 3 Zr particles are uniformly distributed in alloy crystals to inhibit the recrystallization of the alloy, so that the alloy retains a subgrain structure, and the tensile strength of the Al-Zn-Mg series aluminum alloy containing Zr can be obviously improved. Examples 2 to 5 are the same as example 1 and will not be described herein; FIG. 2 is a schematic view of the internal structure of the aluminum alloy prepared in comparative example 1, and it can be seen from FIG. 2 that recrystallization occurred in the alloy in comparative example 1, which shows that the addition of Zr element in the present application effectively suppresses the occurrence of recrystallization. Fig. 3 is a schematic view of the internal structure of the aluminum alloy prepared in comparative example 4, fig. 4 is a schematic view of the internal structure of the aluminum alloy prepared in comparative example 5, and it can be seen from fig. 4 that the process has an influence on the grains of the internal structure of the aluminum alloy, and further, the strength thereof.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A preparation method of Zr-containing Al-Zn-Mg series aluminum alloy is characterized in that the Zr-containing Al-Zn-Mg series aluminum alloy comprises the following chemical components in percentage by mass:
5.05 to 5.10 percent of Zn, 1.04 to 1.12 percent of Mg, 0.22 to 0.24 percent of Cu0.06 to 0.07 percent of Fe, 0.04 to 0.05 percent of Si, 0.10 to 0.20 percent of Zr, less than 0.001 percent of Mn, less than 0.001 percent of Cr and the balance of Al;
the preparation method comprises the following steps:
preparing materials according to chemical components, mixing, smelting, degassing, filtering, cooling the melt to 600 ℃, casting, and homogenizing to obtain an ingot;
and extruding the cast ingot, and performing aging treatment to obtain the Al-Zn-Mg series aluminum alloy containing Zr.
2. The method of claim 1, wherein the temperature of the smelting process is from 700 ℃ to 760 ℃.
3. The preparation method of claim 1, wherein the degassing treatment is to inject argon gas into the melt and stir the melt, and the degassing time is 10min to 15min.
4. The method of claim 1, wherein the filtration treatment is a two-stage filtration of the melt, the first stage filtration being greater than or equal to 30ppi, the second stage filtration being greater than or equal to 50ppi, and the melt temperature during filtration being in the range of 700 ℃ to 750 ℃.
5. The method according to claim 1, wherein the casting speed is 45mm/min to 50mm/min, the cooling water flow rate is 1200L/min to 1500L/min, the casting speed is adjusted to 60mm/min to 75mm/min after casting for 1min to 5min, the cooling water flow rate is 2500L/min to 3000L/min, and the cooling water temperature is less than or equal to 35 ℃.
6. The preparation method of claim 1, wherein the homogenization treatment is heat preservation at 520-550 ℃ for 7.5-8.5 h, and rapid water cooling at a rate of 250-300 ℃/h after discharge.
7. The method according to claim 1, wherein the extrusion temperature is 480 ℃ to 500 ℃, the extrusion speed is 4m/min, and the outlet temperature is not higher than 500 ℃.
8. The method of claim 1, wherein the aging treatment is a two-stage aging treatment comprising a first aging treatment and a second aging treatment.
9. The preparation method according to claim 8, wherein the first time effect treatment is performed by applying a tensile stress of 120MPa to 150MPa, heating to 160 ℃ to 200 ℃, and keeping the temperature for 1h to 2h, and is performed by applying a tensile stress of 200MPa to 250MPa, heating to 220 ℃ to 280 ℃, and keeping the temperature for 1h to 3h, and then naturally cooling to room temperature.
10. The method according to claim 3, wherein the amount of argon is 4-5 m/h, the rotation speed of the rotor is 500-600 r/min, and the working pressure of the gas is 0.2-0.3 MPa.
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| CN108048715A (en) * | 2018-02-01 | 2018-05-18 | 佛山市三水凤铝铝业有限公司 | A kind of high-strength aluminum alloy and its pressing method for consumption electronic product housing |
| CN111519057A (en) * | 2020-05-22 | 2020-08-11 | 广东凤铝铝业有限公司 | Method for prolonging service life of die for preparing aluminum alloy |
| JP2021110042A (en) * | 2020-01-15 | 2021-08-02 | アイシン軽金属株式会社 | Production method for high-strength aluminum alloy extrusion material excellent in toughness and corrosion resistance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108048715A (en) * | 2018-02-01 | 2018-05-18 | 佛山市三水凤铝铝业有限公司 | A kind of high-strength aluminum alloy and its pressing method for consumption electronic product housing |
| JP2021110042A (en) * | 2020-01-15 | 2021-08-02 | アイシン軽金属株式会社 | Production method for high-strength aluminum alloy extrusion material excellent in toughness and corrosion resistance |
| CN111519057A (en) * | 2020-05-22 | 2020-08-11 | 广东凤铝铝业有限公司 | Method for prolonging service life of die for preparing aluminum alloy |
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