CN115927929A - Production method for improving bending performance of Al-Mg-Si series extruded aluminum alloy - Google Patents
Production method for improving bending performance of Al-Mg-Si series extruded aluminum alloy Download PDFInfo
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- 229910052732 germanium Inorganic materials 0.000 claims abstract description 19
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 16
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- 229910052804 chromium Inorganic materials 0.000 claims abstract description 13
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Abstract
The invention discloses a production method for improving bending performance of Al-Mg-Si series extruded aluminum alloy, which comprises the following alloy element components in percentage by mass: 0.4 to 1.3 percent of Mg0.4 to 1.4 percent of Si0.4 to 0.40 percent of Fe0.15 to 0.40 percent, 0.10 to 0.25 percent of Cu, 0.05 to 0.20 percent of Mn0.03 percent of Cr, less than 0.03 percent of V, less than 0.1 percent of Zn, less than 0.1 percent of Ti, and the balance of Al and inevitable impurities; when m is Mg+Si When the content is less than or equal to 1.4 percent, the Mg/Si ratio is controlled between 1.0 and 2.0; when m is Mg+Si When the content is more than 1.4 percent, the Mg/Si ratio is controlled between 0.6 and 1.0, and simultaneously, the trace rare earth elements Ge and La are added, and the added trace rare earth elements Ge and La,La respectively accounts for 0.10-0.20% of the total amount of the alloy element components. The invention has the advantages of small bending anisotropy, excellent longitudinal bending performance, high casting and extrusion production efficiency, low production cost and compatibility with a larger range of Fe content, and the bending anisotropy is reduced to be within 10 percent.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy materials, and particularly relates to a production method of an Al-Mg-Si series aluminum alloy section with excellent extrusion bending performance.
Background
The Al-Mg-Si series aluminum alloy belongs to heat treatment-strengthenable wrought aluminum alloy, has medium strength, excellent formability, weldability and corrosion resistance, and can obtain a thin-wall hollow section with a complex section shape through hot extrusion forming, but the extrudability and performance anisotropy of the Al-Mg-Si series aluminum alloy bring challenges to the application of the Al-Mg-Si series aluminum alloy.
Compared with an axial tensile test, the bending test is more suitable for representing certain cold machining (such as curling, bending and the like) or collision deformation modes of a vehicle body structural member, and a bending angle alpha value obtained through a standard bending test is used as an important mechanical property index of the Al-Mg-Si series aluminum alloy and is usually used for representing the bending capacity of the material. At present, the direction of improving the bending performance is mainly based on the influence mechanism of grain morphology (such as recrystallization and fiber crystal), grain boundary characteristics (such as grain boundary precipitation) and strengthening phases (such as beta 'and beta' phases), and the improvement is realized by microalloying Mn, cr and V and combining a heat treatment process (such as extrusion on-line quenching and aging process) method. On one hand, the method has obvious defects that the casting efficiency and the quality of the aluminum bar (such as cracking and coarse compounds) are seriously influenced by the Mn + Cr + V elements which are added in a compounding way, and meanwhile, the dynamic recrystallization in the extrusion process is inhibited, the extrudability is reduced, so that the extrusion production efficiency is low; on the other hand, the method can only effectively improve the bending performance perpendicular to the extrusion direction, but cannot stably improve the bending performance parallel to the extrusion direction, and the bending performance (transverse) parallel to the extrusion direction is 25-60% lower than the bending performance (longitudinal) perpendicular to the extrusion direction.
At present, in order to improve the bending performance of the Al-Mg-Si series extruded aluminum alloy, the lower Fe content is generally required to be excessively controlled to be reduced to be below 0.25 percent, so that the recycling of recycled aluminum is limited, and the raw material cost is increased.
In addition, the anisotropy of the Al-Mg-Si system extruded aluminum alloy is improved by the Mn + Cr + V composite addition, and the quality and the cost are also problems. Casting cracks easily appear when the casting speed is too high, and coarse crystalline compounds easily form when the casting speed is too low, so that the bending performance is deteriorated; meanwhile, the Mn + Cr + V elements added in a compounding way inhibit dynamic recrystallization in the extrusion process, the work hardening effect is strong, the extrusion effect is poor, the production efficiency is low, and the extrusion cost is overhigh.
Disclosure of Invention
The invention aims to provide a method for improving the bending performance of Al-Mg-Si series extruded aluminum alloy aiming at the technical problems of large anisotropy difference, high raw material cost, high production cost and the like of the existing Al-Mg-Si series extruded aluminum alloy, and the method has the following competitive advantages: small anisotropy, high casting and extrusion production efficiency, low production cost and compatibility with a larger range of Fe content.
In order to achieve the above purpose, the invention designs specific Mg/Si ratio, trace rare earth element and homogenizing process according to different Mg + Si total content under the premise of allowing excessive Fe content (0.20-0.40) based on the influence of the spatial structure (such as beta-AlFeSi, alpha-AlFeSi), size and spatial orientation of second phase particles in the Al-Mg-Si extruded aluminum alloy on bending performance, and combines high-speed extrusion and online strong water cooling process, thereby obtaining fine and dispersedly distributed second phase particles and recrystallized fine crystal structure, thereby reducing the anisotropy of bending performance while ensuring the extrusion production efficiency. The invention relates to a production method for improving bending performance of Al-Mg-Si series extruded aluminum alloy, which is implemented by the following technical scheme:
(1) Preparing raw materials according to the following alloy element components in percentage by mass: 0.4 to 1.3 percent of Mg0.4 to 1.4 percent of Si0.4 to 0.40 percent of Fe0.15 to 0.40 percent, 0.10 to 0.25 percent of Cu, 0.05 to 0.20 percent of Mn0.03 percent of Cr, less than 0.03 percent of V, less than 0.1 percent of Zn, less than 0.1 percent of Ti, and the balance of Al and inevitable impurities;
(1) when m is Mg+Si When the content is less than or equal to 1.4 percent, because the total content of Mg and Si in the alloy is low, the extrusion flow stress of the alloy needs to be reasonably controlled, thereby ensuring that second phase particles are fully crushed and simultaneously meeting the requirements of a high-speed extrusion process, and the ratio of Mg/Si needs to be controlled between 1.0 and 2.0;
(2) when m is Mg+Si When the content is more than 1.4 percent, the extrusion flow stress is increased due to higher total content of Mg and Si in the alloy, the extrusion effect is poor, the Mg/Si ratio needs to be controlled between 0.6 and 1.0,simultaneously, trace rare earth elements Ge and La are added, the added trace rare earth elements Ge and La respectively account for 0.10-0.20% of the total amount of the alloy element components, and the homogenizing cooling rate is strictly controlled, so that the extrudability of the alloy is improved, and the requirement of a high-speed extrusion process is ensured.
(2) And (3) homogenizing: heating to 565-585 ℃ at the speed of 180-300 ℃/H, and then preserving heat for 8-12H; when m is Mg+Si Rapidly cooling at a cooling rate of more than 300 ℃ per hour when the cooling rate is less than or equal to 1.4%; when m is Mg+Si When the temperature is higher than 1.4%, slow cooling is adopted, and the cooling rate is 50-120 ℃ per hour.
(3) An extrusion process: when m is Mg+Si When the temperature is more than 1.4 percent, the head of the aluminum bar is extruded at the temperature of 480-500 ℃, and the linear gradient is 20-40 ℃/m; when m is Mg+Si When the temperature is less than or equal to 1.4 percent, the temperature of the head of the aluminum bar is 500-520 ℃, and the linear gradient is 40-60 ℃/m; extruding the aluminum alloy profile at the extrusion speed of 10-20 m/min and the extrusion ratio of more than 30, and then cooling the aluminum alloy profile to room temperature by water. The temperature of the aluminum alloy section before quenching needs to be controlled within 510-560 ℃, the quenching transfer time needs to be controlled within 10s, and the quenching rate needs to be more than 500 ℃/min.
When m is Mg+Si When the content is less than or equal to 1.4 percent, the mass percentage content of the alloy element components is preferably as follows: 0.4 to 0.8 percent of Mg0.4 to 0.6 percent of Si0.4 to 0.6 percent of Fe0.15 to 0.35 percent of Cu, 0.15 to 0.25 percent of Cu, 0.05 to 0.20 percent of Mn0.03 percent of Cr, less than 0.03 percent of V, less than 0.08 percent of Zn, less than 0.06 percent of Ti, less than 0.01 percent of Ge, less than 0.01 percent of La and the balance of Al and inevitable impurities; wherein the Mg/Si ratio is controlled between 1.0 and 1.8.
When m is Mg+Si When the content is less than or equal to 1.4 percent, the mass percentage content of the alloy element components is further preferably as follows: 0.5 to 0.7 percent of Mg0.4 to 0.55 percent of Si0.4 to 0.55 percent of Fe0.15 to 0.35 percent of Cu, 0.15 to 0.25 percent of Cu, 0.05 to 0.20 percent of Mn0.03 percent of Cr, less than 0.03 percent of V, less than 0.07 percent of Zn, less than 0.03 percent of Ti, less than 0.01 percent of Ge, less than 0.01 percent of La and the balance of Al and inevitable impurities; wherein the Mg/Si ratio is controlled between 1.1 and 1.7.
When m is Mg+Si When the content is more than 1.4 percent, the mass percentage of the alloy element components is preferably as follows: 0.6 to 1.3 percent of Mg0.7 to 1.4 percent of Si0.7 to 1.4 percent of Fe0.22 to 0.37 percent of Cu, 0.14 to 0.26 percent of Cu, 0.09 to 0.22 percent of Mn0.03 percent of Cr, less than 0.03 percent of VZn is less than 0.08 percent, ti is less than 0.06 percent, ge0.10 to 0.20 percent, la0.10 to 0.20 percent, and the balance is Al and inevitable impurities; wherein the Mg/Si ratio is controlled between 0.6 and 1.0.
When m is Mg+Si More preferably, when the content is more than 1.4 percent, the mass percentage of the alloy element components is as follows: mg0.7% -1.2%, si0.9% -1.3%, fe0.23%. E
0.32 percent of Cu, 0.15 to 0.25 percent of Cu, 0.1 to 0.20 percent of Mn, less than 0.03 percent of Cr, less than 0.03 percent of V, less than 0.05 percent of Zn, less than 0.03 percent of Ti, 0.10 to 0.20 percent of Ge0.10 to 0.20 percent of La0, and the balance of Al and inevitable impurities; wherein the Mg/Si ratio is controlled between 0.7 and 0.9.
Generally, al in the alloy element component is an aluminum ingot with the purity of more than or equal to 99.7 percent, and Mg in the alloy element component is a magnesium ingot with the purity of more than or equal to 99.95 percent; the intermediate alloy adopts Al20Si, al50Cu and Al14Ge6La.
As a preferable scheme of the invention, the added trace rare earth elements Ge and La respectively account for 0.15-0.18 percent and 0.11-0.16 percent of the total amount of the alloy element components, and the mass ratio of Ge to La is preferably 1.1-1.5. Researches show that under the proportion, the synergistic effect among elements is favorably exerted, fine strengthening phases are favorably formed and are dispersed and distributed in a matrix, the uniformity of the internal organization structure of the material is obviously improved, and the yield strength and the longitudinal bending performance of the product are improved.
Compared with the prior art, the production method for improving the bending property of the Al-Mg-Si series extruded aluminum alloy has the following advantages:
(1) According to different Mg/Si ratios, the alloy element formula is optimally designed, so that the bending performance anisotropy of the Al-Mg-Si extruded aluminum alloy is reduced to be within 10% from the previous 25-50%, and the corresponding longitudinal bending performance is obviously improved by more than 20% under the high strength with the yield strength of more than 280 MPa.
(2) The trace Mn element is combined with a specific homogenizing process (the temperature is raised to 565-585 ℃ at the speed of 180-300 ℃/H and then is kept at 8-12H), on one hand, the acicular beta-AlFeSi which is difficult to deform is promoted to be fully converted into spherical alpha-AlFeSi which is easy to deform, on the other hand, the dispersion and precipitation of Mn-containing phase are inhibited, and meanwhile, V, cr is strictly controlled to be below 0.03 percent, so that the fine and dispersion distribution of second-phase particles and the recrystallization fine-grain structure are further ensured to be obtained after high-speed extrusion.
(3) By effectively controlling the size and distribution of the second phase particles, the Fe content (0.25-0.40%) in a wider range can be compatible, thereby being beneficial to promoting the recycling of the recovered aluminum and reducing the cost of raw materials.
(4) By optimizing the components of the alloy elements and improving the production process, the casting and extrusion production efficiency is improved by more than 25 percent, thereby greatly improving the production capacity and obviously reducing the production cost.
(5) When the content of Mg + Si is more than 1.4 percent, the yield strength can be obviously improved by adding trace rare earth elements Ge and La and strictly controlling the homogenizing and cooling rate, and the anisotropic difference of the bending property of the Al-Mg-Si extruded aluminum alloy is reduced to be within 10 percent.
Drawings
FIG. 1 is a graph showing a range of Mg-Si composition design in a production method for improving bending properties of an Al-Mg-Si based extruded aluminum alloy according to the present invention; range1: m is Mg+Si ≤1.4，Mg/Si＝1.0-2.0；Range2：m Mg+Si > 1.4, mg/Si =0.6-1.0, trace element Ge + La is added.
Detailed Description
For describing the present invention, the following will explain in detail a production method for improving bending property of an Al-Mg-Si based extruded aluminum alloy according to the present invention with reference to the accompanying drawings and examples.
In combination with a Mg-Si component design range curve chart of a production method for improving the bending property of the Al-Mg-Si series extruded aluminum alloy shown in figure 1, the production method for improving the bending property of the Al-Mg-Si series extruded aluminum alloy disclosed by the invention is characterized in that raw materials are prepared according to the following alloy element components in percentage by mass: 0.4 to 1.3 percent of Mg0.4 to 1.4 percent of Si0.4 to 0.40 percent of Fe0.15 to 0.40 percent, 0.10 to 0.25 percent of Cu, 0.05 to 0.20 percent of Mn0.03 percent of Cr, less than 0.03 percent of V, less than 0.1 percent of Zn, less than 0.1 percent of Ti, and the balance of Al and inevitable impurities;
(1) when m is Mg+Si When the content is less than or equal to 1.4 percent, the ratio of Mg to Si is controlled between 1.0 and 2.0;
(2) when m is Mg+Si When the concentration is more than 1.4 percent, the Mg/Si ratio is controlledThe content of the rare earth elements Ge and La is 0.6-1.0, and the content of the added rare earth elements Ge and La is 0.10-0.20% of the total weight of the alloy element components.
The production method for improving the bending property of the Al-Mg-Si series extruded aluminum alloy is implemented by the following steps.
The first step is as follows: according to the formula of the raw material components, selecting an aluminum ingot with the purity of more than or equal to 99.7 percent and a magnesium ingot with the purity of more than or equal to 99.95 percent, al20Si, al50Cu and Al14Ge6La as intermediate alloys, and Mn75 percent and Fe75 percent of additives as raw materials;
the second step is that: heating and melting the aluminum ingot at 740-760 ℃, and then adding the corresponding magnesium ingot, the intermediate alloy and the Mn agent; when m is Mg+Si When the content is more than 1.4, additionally and respectively adding trace rare earth elements Ge and La, wherein the adding amounts of the trace rare earth elements Ge and La respectively account for 0.10-0.20 percent of the total mass of the alloy element components, and stirring and melting the mixture into aluminum alloy liquid;
the third step: carrying out blowing refining on the aluminum alloy liquid in the furnace for 20-40 minutes by using a sodium-free refining agent, slagging off and standing for 20-40 minutes;
the fourth step: the aluminum alloy solution enters a degassing tank through a launder to carry out online degassing treatment: the rotation speed of the rotor is 300-400 r/min, and the argon flow is 3-5 cubic meters/hour; after degassing, the solution enters a filter box through a launder and is subjected to online filtration treatment through a 40-60 ppi foamed ceramic filter plate;
the fifth step: semi-continuously casting the aluminum alloy liquid into aluminum alloy ingots under the conditions of the casting temperature of 700-720 ℃, the casting speed of 100-150 mm/min and the cooling water flow rate of 2500-3200 ml/min;
and a sixth step: heating the aluminum alloy ingot to 565-585 ℃ at the speed of 180-300 ℃ per hour, homogenizing for 8-12 hours, and then selectively and rapidly cooling (more than 300 ℃/h) or slowly cooling (50-120 ℃/h) to room temperature;
the seventh step: heating the aluminum alloy cast ingot to 480-500 ℃, extruding the aluminum alloy cast ingot into an aluminum alloy section under the conditions that the extrusion speed is 10-20 m/min and the extrusion ratio is more than 30, and then cooling the aluminum alloy section to room temperature by water;
the eighth step: heating the aluminum alloy section to 160-200 ℃, aging for 4-12 hours, and air cooling to obtain the aluminum alloy section.
Table 1 shows the percentage content (%) of each component of the raw materials in the examples of the present invention and the comparative examples;
table 2 shows the bending performance test results of the aluminum alloy sections obtained in the examples of the present invention and the comparative examples.
TABLE 1 percentage of each component (%)
TABLE 2 bending performance test results of aluminum alloy sections obtained in the examples and comparative examples of the present invention
As can be seen from tables 1 and 2, the present invention controls the Mg/Si ratio according to the total amount of Mg + Si in the alloy elements, and examples 1 to 4 are m Mg+Si When the bending strength is less than or equal to 1.4 percent, good indexes that the transverse equivalent bending angle difference and the longitudinal equivalent bending angle difference are between 7.86 percent and 8.96 percent are obtained by controlling the Mg/Si ratio between 1.0 and 2.0, while the transverse equivalent bending angle difference and the longitudinal equivalent bending angle difference of the comparative examples 1 to 3 are as high as 21.77 percent to 60.40 percent; examples 5 to 8 at m Mg+Si When the bending angle is more than 1.4 percent, the Mg/Si ratio is controlled between 0.6 and 1.0, and trace rare earth elements Ge and La are added, so that a good index that the transverse and longitudinal equivalent bending angle difference is 6.02 to 9.26 percent is obtained, while the transverse and longitudinal equivalent bending angle difference of comparative examples 4 to 6 is as high as 46.15 to 60.00 percent; in particular, examples 9 to 12, when m Mg+Si When the content is more than 1.5 percent, the Mg/Si ratio is controlled to be in the range of 0.7-0.9, the added trace rare earth elements Ge and La respectively account for 0.15-0.18 percent and 0.11-0.16 percent of the total amount of the alloy element components, and the mass ratio of Ge to La is 1.1-1.5, the excellent result that the difference of the transverse equivalent bending angle and the longitudinal equivalent bending angle is only 4.17-5.61 percent is obtained, the yield strength is also up to more than 325MPa, and the unexpected technical effect is obtained.
Claims (8)
1. A production method for improving bending performance of Al-Mg-Si series extruded aluminum alloy is characterized by adopting the following technical scheme:
(1) Preparing raw materials according to the following alloy element components in percentage by mass: 0.4 to 1.3 percent of Mg0.4 to 1.4 percent of Si0.4 percent of Fe0.15 to 0.40 percent of Cu, 0.10 to 0.25 percent of Cu, 0.05 to 0.20 percent of Mn0.03 percent of Cr, less than 0.03 percent of V, less than 0.1 percent of Zn, less than 0.1 percent of Ti, and the balance of Al and inevitable impurities;
(1) when m is Mg+Si When the content is less than or equal to 1.4 percent, the Mg/Si ratio is controlled between 1.0 and 2.0;
(2) when m is Mg+Si When the content is more than 1.4 percent, the Mg/Si ratio is controlled between 0.6 and 1.0, trace rare earth elements Ge and La are added simultaneously, and the added trace rare earth elements Ge and La respectively account for 0.10 to 0.20 percent of the total amount of the alloy element components;
(2) And (3) homogenizing: heating to 565-585 ℃ at the speed of 180-300 ℃/H, and then preserving heat for 8-12H; when m is Mg+Si Rapidly cooling at a cooling rate of more than 300 ℃ per hour when the cooling rate is less than or equal to 1.4%; when m is Mg+Si When the temperature is more than 1.4 percent, slow cooling is adopted, and the cooling rate is 50-120 ℃ per hour;
(3) An extrusion process: when m is Mg+Si When the temperature is more than 1.4 percent, the head of the aluminum bar is extruded at the temperature of 480-500 ℃, and the linear gradient is 20-40 ℃/m; when m is Mg+Si When the temperature is less than or equal to 1.4 percent, the temperature of the head of the aluminum bar is 500-520 ℃, and the linear gradient is 40-60 ℃/m; extruding the aluminum alloy profile at the extrusion speed of 10-20 m/min and the extrusion ratio of more than 30, and then cooling the aluminum alloy profile to room temperature by water. The temperature of the aluminum alloy section before quenching needs to be controlled within 510-560 ℃, the quenching transfer time needs to be controlled within 10s, and the quenching rate needs to be more than 500 ℃/min.
2. The method for improving the bending property of the Al-Mg-Si series extruded aluminum alloy as claimed in claim 1, wherein m is Mg+Si When the content is less than or equal to 1.4 percent, the alloy element comprises the following components in percentage by mass: 0.4 to 0.8 percent of Mg0.4 to 0.6 percent of Si0.4 to 0.6 percent of Fe0.15 to 0.35 percent of Cu, 0.15 to 0.25 percent of Mn0.05 to 0.20 percent of Cr, less than 0.03 percent of V, less than 0.08 percent of Zn, less than 0.06 percent of Ti, less than 0.01 percent of Ge, less than 0.01 percent of La, and the balance of Al and TiInevitable impurities; wherein the Mg/Si ratio is controlled between 1.0 and 1.8.
3. The production method for improving the bending property of the Al-Mg-Si series extruded aluminum alloy as claimed in claim 2, wherein the alloy element components comprise, by mass: mg (Mg)
0.5 to 0.7 percent of Si, 0.4 to 0.55 percent of Fe, 0.15 to 0.35 percent of Cu, 0.15 to 0.25 percent of Mn, 0.05 to 0.20 percent of Cr, less than 0.03 percent of V, less than 0.07 percent of Zn, less than 0.03 percent of Ti, less than 0.01 percent of Ge, less than 0.01 percent of La and the balance of Al and inevitable impurities; wherein the Mg/Si ratio is controlled between 1.1 and 1.7.
4. The production method for improving the bending property of the Al-Mg-Si series extruded aluminum alloy according to claim 1, wherein when m is Mg+Si When the content is more than 1.4 percent, the alloy element comprises the following components in percentage by mass: 0.6 to 1.3 percent of Mg0.7 to 1.4 percent of Si0.7 to 0.37 percent of Fe0.22 to 0.37 percent of Cu, 0.14 to 0.26 percent of Cu, 0.09 to 0.22 percent of Mn0.03 percent of Cr, less than 0.03 percent of V, less than 0.08 percent of Zn, less than 0.06 percent of Ti, 0.10 to 0.20 percent of Ge0.10, 0.10 to 0.20 percent of La0.20 percent of La and the balance of Al and inevitable impurities; wherein the Mg/Si ratio is controlled between 0.6 and 1.0.
5. The production method for improving the bending performance of the Al-Mg-Si series extruded aluminum alloy according to claim 4, wherein the alloy elements comprise the following components in percentage by mass: mg (magnesium)
0.7 to 1.2 percent of Si, 0.9 to 1.3 percent of Fe, 0.23 to 0.32 percent of Cu, 0.15 to 0.25 percent of Cu, 0.1 to 0.20 percent of Mn, less than 0.03 percent of Cr, less than 0.03 percent of V, less than 0.05 percent of Zn, less than 0.03 percent of Ti, 0.10 to 0.20 percent of Ge0.10 to 0.20 percent of La0.10 to 0.20 percent of La, and the balance of Al and inevitable impurities; wherein the Mg/Si ratio is controlled between 0.7 and 0.9.
6. The production method for improving the bending property of the Al-Mg-Si series extruded aluminum alloy according to claim 5, wherein when m is Mg+Si When the content is more than 1.5 percent, the alloy element comprises the following components in percentage by mass: 0.7 to 1.0 percent of Mg0.7 to 1.0 percent of Si0.9 to 1.1 percent of Fe0.25 to 0.30 percent of Cu～0.22％,Mn0.1％～0.20％,Cr＜0.03％,V＜
0.03 percent, less than 0.05 percent of Zn, less than 0.03 percent of Ti, 0.14 to 0.18 percent of Ge0.11 to 0.16 percent of La0, and the balance of Al and inevitable impurities.
7. The production method for improving the bending property of the Al-Mg-Si based extruded aluminum alloy according to claim 1, 2, 3, 4, 5 or 6, wherein: al in the alloy element component is an aluminum ingot with the purity of more than or equal to 99.7 percent, and Mg in the alloy element component is a magnesium ingot with the purity of more than or equal to 99.95 percent; the intermediate alloy adopts Al20Si, al50Cu and Al14Ge6La.
8. The production method for improving the bending property of the Al-Mg-Si series extruded aluminum alloy according to claim 4, 5 or 6, wherein: the added trace rare earth elements Ge and La respectively account for 0.15-0.18 percent and 0.11-0.15 percent of the total amount of the alloy element components, and the mass ratio of Ge to La is controlled between 1.1-1.5.
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