CN117737517A - High-iron-content secondary Al-Mg-Si series alloy and preparation method thereof - Google Patents
High-iron-content secondary Al-Mg-Si series alloy and preparation method thereof Download PDFInfo
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- 239000000956 alloy Substances 0.000 title claims abstract description 73
- 229910018464 Al—Mg—Si Inorganic materials 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title abstract description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 80
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Abstract
The invention discloses a high-iron-content secondary Al-Mg-Si alloy and a preparation method thereof. The mass composition of the Al-Mg-Si secondary aluminum alloy is as follows: 0.70 to 0.90 percent of Mg, 0.60 to 0.80 percent of Si, 0.20 to 0.30 percent of Mn, 1.0 to 1.5 percent of Fe, 0.05 to 0.20 percent of Y, 0.1 to 0.4 percent of Lu, unavoidable impurities and the balance of Al. The invention refines the harmful phase alpha-Al by adjusting the composition of the alloy 15 (Fe,Mn) 3 Si 2 The stress corrosion resistance of the alloy is improved, the harm of Fe is greatly inhibited, and the Al-Mg-Si aluminum alloy with high extension stress corrosion resistance and iron-containing impurities is obtained. The prepared alloy has higher elongation percentage, and the maximum of 30% after T6 state heat treatment. Also has better stress corrosion resistance,the stress corrosion sensitivity index is more than 35%.
Description
Technical Field
The invention belongs to the field of new materials, and particularly relates to a high-strength high-elongation stress corrosion-resistant recoverable Al-Mg-Si-Fe-Re aluminum alloy containing iron impurities and a manufacturing method thereof.
Background
The 6XXX series Al-Mg-Si series alloy belongs to heat-treatable reinforced aluminum alloys. The alloy has good formability, high stress corrosion resistance, excellent surface performance and weldability, and is mainly applied to the fields of building profiles, automobile body parts, aerospace and the like. It is counted that only 20% of the scrap of the 6XXX series aluminum alloy is currently recovered as a wrought alloy, the recovery trend of which is still increasing year by year, and the field of application of Al-Mg-Si alloys is extremely broad, which is expected to constitute one of the major parts of the scrap recovered in the future.
However, due to complex sources and high pretreatment difficulty, the Al-Mg-Si scrap aluminum is often doped with different types and different qualities of waste metals, so that in the remelting recovery process of the scrap aluminum, the melt contains more nonmetallic inclusions and higher-content soluble impurity elements, mainly including H, li, si, cu, zn, mn, fe and the like. Wherein Fe impurity is the most harmful, and often combines with Al element and other elements in the alloy to form iron-rich intermetallic compound, one is alpha-Al in Chinese character shape or fish bone shape 15 (Fe,Mn) 3 Si 2 Phase, the other being beta-Al in needle or lath form 5 FeSi/Al 9 Fe 2 Si 2 And (3) phase (C). These iron-rich phases are mostly hard and brittle phases and often impair the mechanical properties of the alloy to a different extent, in particular in terms of plasticity. Meanwhile, the corrosion performance and the casting performance of the alloy are also seriously affected, and the quality of the aluminum alloy is reduced. These iron-rich phases have a high melting point and good thermal stability and are difficult to eliminate by heat treatment, and thereforeThe presence of these iron-rich phases has greatly limited the development of the secondary aluminum industry and the efficient recovery of aluminum alloys presents a significant challenge.
At present, the most direct method for reducing the iron-rich phase in the regenerated aluminum melt is to directly remove Fe element from the aluminum melt, and the related technology mainly comprises the following steps: gravity sedimentation, centrifugal removal, electromagnetic separation, and the like. However, these methods are often too expensive and difficult to handle continuously, and are not suitable for practical production.
The research shows that the rare earth element not only can refine alpha-Al dendrite and reduce the pore space in aluminum melt, but also can improve the size or morphology of the needle-shaped iron-rich phase, thereby playing a certain role in deterioration. However, rare earth elements are various and have different functions, and it is still yet to be solved how to effectively improve the performance of the secondary aluminum alloy (recycled aluminum alloy) while adding rare earth elements as little as possible.
Disclosure of Invention
The invention aims to overcome at least one defect of the prior art and provide a high-iron-content secondary Al-Mg-Si alloy and a preparation method thereof.
The technical scheme adopted by the invention is as follows:
in a first aspect of the invention, there is provided:
the Al-Mg-Si secondary aluminum alloy with high iron impurity comprises the following components in mass portion: 0.70 to 0.90 percent of Mg, 0.60 to 0.80 percent of Si, 0.20 to 0.30 percent of Mn, 1.0 to 1.5 percent of Fe, 0.05 to 0.20 percent of Y, 0.1 to 0.4 percent of Lu, unavoidable impurities and the balance of Al.
In some examples of Al-Mg-Si secondary aluminum alloys, the Fe content is 1.1-1.4%.
In some examples of Al-Mg-Si secondary aluminum alloys, the mass ratio of Fe: re=7: (1-4), re is the sum of the addition amounts of Y and Lu.
In some examples of Al-Mg-Si secondary aluminum alloys, the total addition of Y and Lu is 0.15 to 0.6%.
In some examples of Al-Mg-Si secondary aluminum alloys, the mass ratio of Fe: re=7: (1-4), re is the sum of the addition amount of Y and Lu, and the total addition amount of Y and Lu is 0.15-0.6%.
In some examples of Al-Mg-Si secondary aluminum alloys, the Fe content is 1.1 to 1.4%, the mass ratio of Fe: re=7: (1-4), re is the sum of the addition amounts of Y and Lu.
In some examples of Al-Mg-Si secondary aluminum alloys, the Fe content is 1.1 to 1.4%, the mass ratio of Fe: re=7: (1-4), re is the sum of the addition amount of Y and Lu, and the total addition amount of Y and Lu is 0.15-0.6%.
In some examples of Al-Mg-Si secondary aluminum alloys, the content of unavoidable impurities does not exceed 1%.
In a second aspect of the invention, there is provided:
a method for preparing an Al-Mg-Si secondary aluminum alloy with high iron content impurities, the composition of which is described in the second aspect of the invention, comprising the steps of:
s1) weighing raw materials according to the composition, and smelting to obtain an alloy ingot;
s2) extruding the alloy cast ingot into a profile through an extruder, immediately putting into water for quenching to obtain a quenched profile;
s3) carrying out solid solution and artificial aging treatment on the quenched section bar ingot, taking out after the treatment is finished, and carrying out air cooling to obtain the required alloy.
In some examples of the preparation method, the solution treatment is carried out at 500-520 ℃ for 0.5-1 h.
In some examples of the preparation method, the aging treatment is carried out at 150-180 ℃ for 2-4 hours.
In some examples of the preparation method, the smelting temperature is 730-750 ℃ when no magnesium ingot is added, and 660-700 ℃ when magnesium ingot is added.
In some examples of the preparation method, the solution treatment is carried out at 500-520 ℃ for 0.5-1 h, and the aging treatment is carried out at 150-180 ℃ for 2-4 h.
In some examples of the preparation method, the smelting temperature is 730-750 ℃ when no magnesium ingot is added, 660-700 ℃ when the magnesium ingot is added, and the solid solution treatment is 500-520 ℃ and the heat preservation is carried out for 0.5-1 h.
In some examples of the preparation method, the smelting temperature is 730-750 ℃ when no magnesium ingot is added, 660-700 ℃ when the magnesium ingot is added, the solution treatment is 500-520 ℃ for heat preservation for 0.5-1 h, and the aging treatment is 150-180 ℃ for heat preservation for 2-4 h.
In some examples of the preparation method, the starting materials are aluminum ingots, magnesium ingots, aluminum-manganese, aluminum-silicon intermediate alloys, and aluminum-rare earth intermediaries.
The beneficial effects of the invention are as follows:
the invention firstly proposes adding rare earth (Re) combination of Y and Lu to control the formation and morphology of iron impurities, and alpha-Al dendrites are obviously refined after adding Re to form Al 2 Si 2 Re ternary intermetallic compounds. The new phase Al 2 Si 2 Re is alpha-Al 15 (Fe,Mn) 3 Si 2 The phase is formed after and distributed in alpha-Al 15 (Fe,Mn) 3 Si 2 The periphery and the surface of the phase obviously refine the harmful phase alpha-Al 15 (Fe,Mn) 3 Si 2 On the one hand, due to the harmful phase alpha-Al 15 (Fe,Mn) 3 Si 2 The phase size and the length-diameter ratio are large, so that the phase size and the length-diameter ratio are often used as crack initiation sources, the crack propagation is accelerated, the mechanical property of the alloy is reduced, and therefore, the strength and the elongation rate can be improved by refining the harmful phase; on the other hand, since the cracks are distributed along the alpha-Al at the grain boundary 15 (Fe,Mn) 3 Si 2 The phase expansion and the refinement of the harmful phase can improve the stress corrosion resistance of the alloy. Greatly inhibit the harm of Fe and obtain the Al-Mg-Si aluminum alloy with high extension stress corrosion resistance and iron impurities. Among them, the element Lu has a remarkable grain refining effect, but is expensive. After being combined with the rare earth element Y, the rare earth element Y and the rare earth element Y have synergistic effect, thereby not only achieving the refining effect, but also reducing the comprehensive cost. The combination of rare earth elements has better refining effect.
The high-iron secondary Al-Mg-Si series alloy of some examples of the invention has higher elongation and the maximum of 30% after T6 state heat treatment. Also has better stress corrosion resistance, and the stress corrosion sensitivity index is more than 35%.
According to the invention, by implementing effective and executable composite microalloying means and matching a reasonable heat treatment process system, the bottleneck problem that the traditional 6XXX aluminum alloy is difficult to recover due to higher iron impurities is solved, and meanwhile, the mechanical and stress corrosion resistance of the secondary aluminum alloy is improved.
Drawings
FIG. 1 is a three-dimensional morphology of alloys of different Re contents: (a) 0; (b) 0.15Re; (c) 0.2Re; (d) 0.3YRe.
Detailed Description
In a first aspect of the invention, there is provided:
the Al-Mg-Si secondary aluminum alloy with high iron impurity comprises the following components in mass portion: 0.70 to 0.90 percent of Mg, 0.60 to 0.80 percent of Si, 0.20 to 0.30 percent of Mn, 1.0 to 1.5 percent of Fe, 0.05 to 0.20 percent of Y, 0.1 to 0.4 percent of Lu, unavoidable impurities and the balance of Al.
In some examples of Al-Mg-Si secondary aluminum alloys, the Fe content is 1.1-1.4%. This is the range of Fe content in the multiple secondary alloy.
In some examples of Al-Mg-Si secondary aluminum alloys, the mass ratio of Fe: re=7: (1-4), re is the sum of the addition amounts of Y and Lu. By controlling the ratio of the two, relatively expensive Y and Lu can be added more accurately, and the cost is reduced on the premise of ensuring the material performance.
In some examples of Al-Mg-Si secondary aluminum alloys, the total addition of Y and Lu is 0.15 to 0.6%.
In some examples of Al-Mg-Si secondary aluminum alloys, the mass ratio of Fe: re=7: (1-4), re is the sum of the addition amount of Y and Lu, and the total addition amount of Y and Lu is 0.15-0.6%.
In some examples of Al-Mg-Si secondary aluminum alloys, the Fe content is 1.1 to 1.4%, the mass ratio of Fe: re=7: (1-4), re is the sum of the addition amounts of Y and Lu.
In some examples of Al-Mg-Si secondary aluminum alloys, the Fe content is 1.1 to 1.4%, the mass ratio of Fe: re=7: (1-4), re is the sum of the addition amount of Y and Lu, and the total addition amount of Y and Lu is 0.15-0.6%.
In some examples of Al-Mg-Si secondary aluminum alloys, the content of unavoidable impurities does not exceed 1%. The fewer the impurities are, the more favorable is for obtaining the Al-Mg-Si secondary aluminum alloy with stable quality.
In a second aspect of the invention, there is provided:
a method for preparing an Al-Mg-Si secondary aluminum alloy with high iron content impurities, the composition of which is described in the second aspect of the invention, comprising the steps of:
s1) weighing raw materials according to the composition, and smelting to obtain an alloy ingot;
s2) extruding the alloy cast ingot into a profile through an extruder, immediately putting into water for quenching to obtain a quenched profile;
s3) carrying out solid solution and artificial aging treatment on the quenched section bar ingot, taking out after the treatment is finished, and carrying out air cooling to obtain the required alloy.
Through solid solution, the element distribution can be more uniform, which is beneficial to improving the uniformity of the material. In some examples of the preparation method, the solution treatment is carried out at 500-520 ℃ for 0.5-1 h.
The aging treatment can better promote the generation and stabilization of crystal grains. In some examples of the preparation method, the aging treatment is carried out at 150-180 ℃ for 2-4 hours.
In some examples of the preparation method, the smelting temperature is 730-750 ℃ when no magnesium ingot is added, and 660-700 ℃ when magnesium ingot is added. Magnesium can be more uniformly dispersed in the alloy by adding magnesium ingots at a lower temperature, which is beneficial to improving the overall performance of the alloy.
In some examples of the preparation method, the solution treatment is carried out at 500-520 ℃ for 0.5-1 h, and the aging treatment is carried out at 150-180 ℃ for 2-4 h.
In some examples of the preparation method, the smelting temperature is 730-750 ℃ when no magnesium ingot is added, 660-700 ℃ when the magnesium ingot is added, and the solid solution treatment is 500-520 ℃ and the heat preservation is carried out for 0.5-1 h.
In some examples of the preparation method, the smelting temperature is 730-750 ℃ when no magnesium ingot is added, 660-700 ℃ when the magnesium ingot is added, the solution treatment is 500-520 ℃ for heat preservation for 0.5-1 h, and the aging treatment is 150-180 ℃ for heat preservation for 2-4 h.
The types of the raw materials can be adjusted according to the needs. In some examples of the preparation method, the starting materials are aluminum ingots, magnesium ingots, aluminum-manganese, aluminum-silicon intermediate alloys, and aluminum-rare earth intermediaries. The aluminum ingot can be prepared from secondary recovered aluminum.
The present invention will be described in detail with reference to examples, comparative examples and experimental data. Unless otherwise indicated, the percentages in the compositions are mass percentages.
The alloy comprises, by mass, 0.70-0.90% of Mg, 0.60-0.80% of Si, 0.20-0.30% of Mn, 1.0-1.5% of Fe and 0.15-0.6% of Re. Pure Al and Mg cast ingots are selected as raw materials, and Al-10Fe, al-10Y, al-30Si intermediate alloy and secondary Al-0.68Mg-0.58Si-0.55Fe-0.26Mn alloy are added.
The multi-element refining agent and the deaerating agent are NaCl-KCl composite refining agent and C which are common in the field 2 Cl 6 And (3) a degassing agent. The mass ratio of the composite refining agent to the smelting ingredients is 2:100, the composition of the multi-component composite refining agent comprises: 20wt% NaCl, 20wt% KCl, 35wt% NaF, 25wt% LiF; the mass ratio of the degasifier to the smelting ingredients is 1:100, after degassing, carrying out slag removing treatment on the aluminum liquid by using a slag removing tool, wherein the removed liquid needs to be intensively treated. When the purity of the raw material is not high and the impurities are large, the amount of the multi-component refining agent and the deaerator needs to be appropriately increased.
For ease of comparison, the impurities in each example are exemplified by 0.5%.
Example 1
1) 0.81 percent of Mg, 0.75 percent of Si, 0.24 percent of Mn, 1.1 percent of Fe and 0.15 percent of Re are taken according to the weight percentage of the constituent elements, wherein Y is 0.05 percent, lu is 0.1 percent and the balance is Al; preparing an aluminum ingot, an aluminum intermediate alloy and a rare earth alloy, smelting at 730-750 ℃ to fully melt and mix the raw materials uniformly, cooling to 660-700 ℃, and adding a magnesium ingot to obtain a final alloy ingot.
2) And (3) carrying out solid solution treatment (heat preservation for 1h at 500-520 ℃) and aging treatment (heat preservation for 2-4h at 160 ℃) on the prepared alloy ingot, taking out a sample, and then carrying out air cooling.
Example 2
1) 0.85 percent of Mg, 0.68 percent of Si, 0.21 percent of Mn, 1.1 percent of Fe and 0.20 percent of Re are taken according to the weight percentage of the constituent elements, wherein Y is 0.06 percent, lu is 0.14 percent, and the balance is Al; preparing an aluminum ingot, an aluminum intermediate alloy and a rare earth alloy, smelting at 730-750 ℃ to fully melt and mix the raw materials uniformly, cooling to 660-700 ℃, and adding a magnesium ingot to obtain a final alloy ingot.
2) And (3) carrying out solid solution treatment (heat preservation for 1h at 500-520 ℃) and aging treatment (heat preservation for 2-4h at 160 ℃) on the prepared alloy ingot, taking out a sample, and then carrying out air cooling.
Example 3
1) 0.74 percent of Mg, 0.62 percent of Si, 0.20 percent of Mn, 1.1 percent of Fe and 0.30 percent of Re are taken according to the weight percentage of the constituent elements, wherein Y is 0.1 percent, lu is 0.2 percent, and the balance is Al; preparing an aluminum ingot, an aluminum intermediate alloy and a rare earth alloy, smelting at 730-750 ℃ to fully melt and mix the raw materials uniformly, cooling to 660-700 ℃, and adding a magnesium ingot to obtain a final alloy ingot.
2) And (3) carrying out solid solution treatment (heat preservation for 1h at 500-520 ℃) and aging treatment (heat preservation for 2-4h at 160 ℃) on the prepared alloy ingot, taking out a sample, and then carrying out air cooling.
Example 4
1) 0.80 percent of Mg, 0.62 percent of Si, 0.25 percent of Mn, 1.1 percent of Fe and 0.40 percent of Re are taken according to the weight percentage of the constituent elements, wherein Y is 0.1 percent, lu is 0.3 percent, and the balance is Al; preparing an aluminum ingot, an aluminum intermediate alloy and a rare earth alloy, smelting at 730-750 ℃ to fully melt and mix the raw materials uniformly, cooling to 660-700 ℃, and adding a magnesium ingot to obtain a final alloy ingot.
2) And (3) carrying out solid solution treatment (heat preservation for 1h at 500-520 ℃) and aging treatment (heat preservation for 2-4h at 160 ℃) on the prepared alloy ingot, taking out a sample, and then carrying out air cooling.
Example 5
1) 0.75 percent of Mg, 0.69 percent of Si, 0.21 percent of Mn, 1.1 percent of Fe and 0.50 percent of Re are taken according to the weight percentage of the constituent elements, wherein Y is 0.15 percent, lu is 0.35 percent, and the balance is Al; preparing an aluminum ingot, an aluminum intermediate alloy and a rare earth alloy, smelting at 730-750 ℃ to fully melt and mix the raw materials uniformly, cooling to 660-700 ℃, and adding a magnesium ingot to obtain a final alloy ingot.
2) And (3) carrying out solid solution treatment (heat preservation for 1h at 500-520 ℃) and aging treatment (heat preservation for 2-4h at 160 ℃) on the prepared alloy ingot, taking out a sample, and then carrying out air cooling.
Example 6
1) 0.72 percent of Mg, 0.66 percent of Si, 0.27 percent of Mn, 1.1 percent of Fe and 0.60 percent of Re are taken according to the weight percentage of the constituent elements, wherein Y is 0.24 percent, lu is 0.36 percent, and the balance is Al; preparing an aluminum ingot, an aluminum intermediate alloy and a rare earth alloy, smelting at 730-750 ℃ to fully melt and mix the raw materials uniformly, cooling to 660-700 ℃, and adding a magnesium ingot to obtain a final alloy ingot.
2) And (3) carrying out solid solution treatment (heat preservation for 1h at 500-520 ℃) and aging treatment (heat preservation for 2-4h at 160 ℃) on the prepared alloy ingot, taking out a sample, and then carrying out air cooling.
(influence of preparation process on material properties, no corresponding examples are presented)
Comparative example 1
1) According to the weight percentage of the constituent elements, 0.79 percent of Mg, 0.63 percent of Si, 0.23 percent of Mn, 1.1 percent of Fe, 0 percent of Re and the balance of Al are taken; preparing an aluminum ingot, an aluminum intermediate alloy and a rare earth alloy, smelting at 730-750 ℃ to fully melt and mix the raw materials uniformly, cooling to 660-700 ℃, and adding a magnesium ingot to obtain a final alloy ingot.
2) And (3) carrying out solid solution treatment (heat preservation for 1h at 500-520 ℃) and aging treatment (heat preservation for 2-4h at 160 ℃) on the prepared alloy ingot, taking out a sample, and then carrying out air cooling.
Comparative example 2
1) 0.70 percent of Mg, 0.61 percent of Si, 0.22 percent of Mn, 1.1 percent of Fe and 1.0 percent of Re are taken according to the weight percentage of the constituent elements, wherein Y is 0.3 percent, lu is 0.7 percent, and the balance is Al; preparing an aluminum ingot, an aluminum intermediate alloy and a rare earth alloy, smelting at 730-750 ℃ to fully melt and mix the raw materials uniformly, cooling to 660-700 ℃, and adding a magnesium ingot to obtain a final alloy ingot.
2) And (3) carrying out solid solution treatment (heat preservation for 1h at 500-520 ℃) and aging treatment (heat preservation for 2-4h at 160 ℃) on the prepared alloy ingot, taking out a sample, and then carrying out air cooling.
Performance comparison of recoverable Al-Mg-Si-Fe-Re alloys with different Re content
Mechanical and corrosion performance tests are respectively carried out on the high-speed rail Al-Mg-Si-Fe-Re alloy plates obtained in the examples and the comparative examples, wherein the strength and elongation test method is carried out according to GB/T228.1-2010 section 1 of tensile test of metallic materials: the results of the determination in room temperature test method are shown in Table 1. Test method of corrosion performance according to national standard GB/T15970.7-2017, a slow strain rate tensile test was used to study stress corrosion cracking sensitivity of alloys, and the results are shown in Table 2.
TABLE 1 mechanical test results
1) Comparative examples 1 to 6 show that the strength and elongation of the alloy are improved and reduced with increasing Re;
2) The Re content of comparative example 1 and comparative example 2 is not within a limited range, and the mechanical properties of the alloy are significantly reduced.
FIG. 1 is a microstructure of the high-iron Al-Mg-Si-Fe-Re alloy prepared in comparative example 1 and examples 1-3, from which it can be seen that the detrimental phase α -Al increases with increasing Re 15 (Fe,Mn) 3 Si 2 From a long fishbone (fig. 1 a) to shorter petals (fig. 1 b, c) and finally to irregular bars (fig. 1 d) of decreasing size. Al formed after Re addition 2 Si 2 Re phase is distributed in harmful phase alpha-Al 15 (Fe,Mn) 3 Si 2 The nucleation and growth of harmful phases are greatly limited by adhering the alloy to the surface, so that the harmful phases are refined, and the mechanical properties of the alloy are improved.
TABLE 2 stress corrosion test results
1) Comparative examples 1 to 3 show that the corrosion performance of the alloy is improved with the increase of the Re consumption;
2) The Re content of comparative example 1 is not within a limited range, and the corrosion performance of the alloy is significantly reduced.
The above description of the present invention is further illustrated in detail and should not be taken as limiting the practice of the present invention. It is within the scope of the present invention for those skilled in the art to make simple deductions or substitutions without departing from the concept of the present invention.
Claims (10)
1. The Al-Mg-Si secondary aluminum alloy with high iron impurity comprises the following components in mass portion: 0.70 to 0.90 percent of Mg, 0.60 to 0.80 percent of Si, 0.20 to 0.30 percent of Mn, 1.0 to 1.5 percent of Fe, 0.05 to 0.20 percent of Y, 0.1 to 0.4 percent of Lu, unavoidable impurities and the balance of Al.
2. The Al-Mg-Si secondary aluminum alloy according to claim 1, wherein the Fe content is 1.1 to 1.4%.
3. The Al-Mg-Si secondary aluminum alloy according to claim 1, wherein the content of unavoidable impurities is not more than 1%.
4. The Al-Mg-Si secondary aluminum alloy according to any one of claims 1 to 3, wherein the mass ratio of Fe: re=7: (1-4), re is the sum of the addition amounts of Y and Lu.
5. The Al-Mg-Si secondary aluminum alloy according to any one of claims 1 to 3, wherein the total addition amount of Y and Lu is 0.15 to 0.6%.
6. A method for preparing an Al-Mg-Si secondary aluminum alloy high in iron-containing impurities, the Al-Mg-Si secondary aluminum alloy having a composition as set forth in any one of claims 1 to 5, comprising the steps of:
s1) weighing raw materials according to the composition, and smelting to obtain an alloy ingot;
s2) extruding the alloy cast ingot into a profile through an extruder, immediately putting into water for quenching to obtain a quenched profile;
s3) carrying out solid solution and artificial aging treatment on the quenched section bar ingot, taking out after the treatment is finished, and carrying out air cooling to obtain the required alloy.
7. The method according to claim 6, wherein the solution treatment is carried out at 500 to 520 ℃ for 0.5 to 1 hour.
8. The method according to claim 6 or 7, wherein the aging treatment is carried out at 150 to 180 ℃ for 2 to 4 hours.
9. The method according to claim 6 or 7, wherein the melting temperature is 730 to 750 ℃ when no magnesium ingot is added, and 660 to 700 ℃ when a magnesium ingot is added.
10. The method according to claim 6 or 7, wherein the raw material is aluminum ingot, magnesium ingot, aluminum-manganese, aluminum-silicon intermediate alloy, or aluminum-rare earth intermediate alloy.
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