High-strength aluminum alloy profile for anti-collision beam and preparation method of high-strength aluminum alloy profile

Abstract

The invention discloses a high-strength aluminum alloy profile for an anti-collision beam and a preparation method of the high-strength aluminum alloy profile, and the aluminum alloy profile comprises the following components in percentage by mass: 0.42-0.62% of Si; 0.15% to 0.30% of Fe; 0.18% to 0.35% of Cu; mn: less than or equal to 0.15%; mg: 0.87%-1.07%; 0.06% to 0.24% of Cr; 0.10% or less of Zn; 0.02% to 0.14% of Ti; 0.05%-0.15% of La series rare earth; 0.02% to 0.05% of Ge; and the balance of Al and inevitable impurities. The components of the 6-series aluminum alloy are optimized, the content of Fe and Zn is reduced, a small amount of Ge is introduced, the Ge can replace part of Si, compared with Si, a composite phase higher in density and better in coherence with a matrix is formed, and the strength of the aluminum alloy is improved. In addition, Sc is further introduced, Sc and Ge have a good synergistic effect with other elements, and the strength and toughness of the aluminum alloy are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bumper materials, and particularly relates to a high-strength aluminum alloy profile for a bumper beam and a preparation method thereof. Background Art

[0002] The vehicle bumper beam is a key component of the vehicle collision system. With the continuous improvement of the safety performance requirements of the collision system in the vehicle industry and the increasing requirements for vehicle lightweighting, aluminum alloy extruded profiles have become the preferred materials for vehicle bumper beams.

[0003] Currently, the strength of conventional 6-series aluminum materials is relatively low. Although 7-series high-strength aluminum materials have excellent lightweighting effects, their material toughness is poor. There are also some technologies that have developed aluminum alloys with high strength and excellent toughness. For example, CN118086732A discloses an aluminum profile, a preparation method thereof, and an application. The components of the aluminum profile include Mg: 0.8 - 1.2%; Si: 0.7 - 1%; Cu: 0.3 - 0.7%; Mn: 0.4 - 0.8%; Cr + V: 0.1 - 0.3%; rare earth elements 0.01 - 0.1%; Fe: ≤0.3%; the balance is Al and unavoidable impurities. This aluminum profile ensures the high toughness of the aluminum profile by adding V and rare earth elements, and the control of elements such as Mg, Si, and Cu ensures high strength. However, it is necessary to strictly control the size and area of Mg2Si particles that are not incorporated into the aluminum profile, which increases the difficulty for the production process and related characterization. CN110055442A discloses an aluminum alloy profile for producing a high-strength ultra-light all-aluminum vehicle frame and a preparation method thereof. The aluminum alloy profile includes the following components in weight percentages: Si: 0.65 - 0.75%, Fe: 0.17 - 0.22%, Cu: 0.17 - 0.22%, Mn: 0.08 - 0.12%, Mg: 0.85 - 0.95%, Cr: 0.06 - 0.11%, B: 0.03 - 0.06%, Mo: 0.015 - 0.025%, Zn: 0.03 - 0.05%, Ti: 0.03 - 0.05%, and the balance is aluminum and unavoidable impurities. Through the synergistic effect of B, Mo with Mn, Cr, and Ti in the formula, the surface quality and welding quality of the aluminum alloy product are improved; the synergistic effect of Mo with Mg and Mo with Al improves the surface quality and impact resistance of the aluminum alloy product. However, coarse borides may segregate at the grain boundaries, becoming stress concentration points and reducing toughness.

[0004] Therefore, it is necessary to provide an aluminum alloy profile with high strength, excellent toughness, and a simple preparation process. Summary of the Invention

[0005] To solve the problems existing in the prior art, the present invention provides a high-strength aluminum alloy profile for a bumper beam, which comprises, by mass percentage: Si: 0.42% - 0.62%; Fe: 0.15% - 0.30%; Cu: 0.18% - 0.35%; Mn: ≤0.15%; Mg: 0.87% - 1.07%; Cr: 0.06% - 0.24%; Zn: ≤0.10%; Ti: 0.02% - 0.14%; rare earth of La series: 0.05% - 0.15%; Ge: 0.02% - 0.05%; the balance is Al and unavoidable impurities.

[0006] The aluminum alloy profile of the present invention is based on the 6-series aluminum alloy 6061. The main elements are Mg and Si, followed by Cu, and then Mn, Cr and Ti. The Mg2Si strengthening phase formed by Mg and Si is crucial for strength. Cu can increase the heat treatment strengthening effect, inhibit the extrusion effect, and at the same time form the Cu2Mg8Si6Al5 phase, further improving the strength. For the trace elements Mn, Cr and Ti, Mn and Cr can improve the strength, improve the corrosion resistance, and at the same time inhibit recrystallization and refine the grains; Ti can refine the grains to a certain extent and also form an alloy with Al, playing a role in refining the casting structure and the weld structure. Fe is easy to form coarse AlFeSi phases with Si and Mn, reducing plasticity and corrosion resistance. Generally, it is considered to have an inhibitory effect on the performance of aluminum alloys, and the content needs to be strictly controlled, and the total content of Mn and Fe needs to be considered. Zn has little effect on strength, but excessive amount will deteriorate the comprehensive performance, and the content also needs to be controlled. Increasing the content of Mg and Si can improve the tensile strength, but will reduce the elongation. The ratio of Mg and Si (Mg / Si ratio) is crucial for the formation of the strengthening phase. When the ratio reaches about 1.73, enough Mg2Si phase can be formed. If Si is excessive, excess Si phase or AlMnSi phase may be formed, and the strengthening effect of these phases is not as good as that of Mg2Si, thus affecting the performance. On the basis of optimizing the content of elements such as Zn and Fe, the present invention adds a small amount of Ge. Ge can replace part of Si, forming a composite phase with higher density and better coherency with the matrix compared with Si, thus enhancing the strength of the aluminum alloy.

[0007] Sc and Al can form nano-scale Al3Sc precipitation phases, refining the strength of the alloy and improving the toughness. Some studies have shown that the tensile strength of an aluminum alloy containing 0.1% Sc can reach 400 MPa, and the elongation rate remains above 18%. However, the price of Sc is high, and based on different aluminum alloy formulations, the role of Sc is also difficult to predict. On the basis of the basic aluminum alloy formulation of the present invention, optimizing the mass ratio of Sc and Ge can not only reduce the dosage of Sc, but also significantly improve the performance of the aluminum alloy.

[0008] Furthermore, the high-strength aluminum alloy profile for the anti-collision beam includes 0.01% - 0.03% of Sc in addition to Al and inevitable impurities.

[0009] Furthermore, the mass ratio of the Sc and Ge is 1:2 - 3.

[0010] It should be noted that the La series of rare earths include La, Ce, Pr, Nd, Pm, Sm, Eu, etc., and their main functions in aluminum alloys are to refine grains, purify the melt, and neutralize impurities. The type does not need to be strictly limited, and one or more of them can be freely selected. Exemplarily, one of La and Ce can be selected.

[0011] The present invention also provides a preparation method for the above-mentioned high-strength aluminum alloy profile for the anti-collision beam, including: After melting the aluminum ingot, add Mn and Cr, then add other raw materials except rare earths, and finally add the aluminum rare earth alloy for smelting to obtain the aluminum alloy melt; Filter the aluminum alloy melt to obtain the alloy liquid to be used; Cast the alloy liquid to be used into a blank; Perform homogenization, extrusion forming, heat treatment, aging treatment, and stretch leveling on the blank in sequence to obtain the high-strength aluminum alloy profile for the anti-collision beam.

[0012] Furthermore, the temperature of the smelting is 650 - 800 °C; The homogenization is carried out at 530 - 580 °C for 6 - 8 h; The temperature of the heat treatment is 500 - 560 °C.

[0013] Furthermore, the filtration is carried out using a double-stage ceramic filter plate, and the mesh numbers of the double-stage ceramic filter plate are 30 - 40 meshes and 50 - 60 meshes respectively.

[0014] Furthermore, when performing extrusion forming, after heating the homogenized blank to 500 - 560 °C at a temperature gradient of 6 - 8 °C / min, extrude it with an extrusion die at 460 - 500 °C at an extrusion speed of 4 - 6 m / min.

[0015] Furthermore, the aging treatment is carried out at 185 ± 5 °C for 120 - 240 min.

[0016] Furthermore, the stretch amount of the stretch leveling is 1% - 5%.

[0017] Furthermore, before casting the alloy liquid to be used into a blank, it is also left standing at 660 - 770 °C for 0.5 - 2 h.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The present invention optimizes the components of the 6-series aluminum alloy, reduces the contents of Fe and Zn, and introduces a small amount of Ge, which can replace part of Si and form a composite phase with higher density and better coherence with the matrix than Si, thereby improving the strength of the aluminum alloy. In addition, Sc is also introduced, and Sc and Ge have a good synergistic effect with other elements, significantly improving the strength and toughness of the aluminum alloy. DETAILED DESCRIPTION

[0019] The endpoints and any values ​​of the ranges disclosed in the present invention are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be regarded as specifically disclosed in the present invention.

[0020] The following will be combined with the specific embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0021] A high-strength aluminum alloy profile for an anti-collision beam, wherein the components of the aluminum alloy profile are Si: 0.57%; Fe: 0.16%; Cu: 0.30%; Mn: 0.10%; Mg: 0.98%; Cr: 0.16%; Zn: 0.08%; Ti: 0.12%; Ce: 0.08%; Ge: 0.03%; the remainder is Al and unavoidable impurities. The preparation method thereof is as follows: (1) Melting: Add aluminum ingots into a melting furnace and set the temperature of the melting furnace to 750°C. When the temperature of the aluminum ingots rises to the set value and begins to melt, add powdered Mn and Cr into the melting furnace, then add aluminum-silicon master alloy, aluminum-iron master alloy, pure copper, magnesium ingot, aluminum-zinc master alloy, aluminum-titanium master alloy and aluminum-germanium master alloy, and finally add cerium-aluminum master alloy and stir. Stir evenly at 750°C until the materials are completely melted to obtain aluminum alloy melt. (2) Filtration: The aluminum alloy melt is filtered using a double-stage ceramic filter plate with mesh sizes of 30 and 60, respectively, to obtain a molten alloy to be used; (3) Casting: Cast the alloy liquid to be used into an aluminum rod, and then place it at 700°C for 1 hour to obtain a billet; (4) Homogenization treatment: placing the billet in a homogenization treatment device and keeping it at 550°C for 7 hours to obtain a homogenized aluminum alloy ingot; (5) Extrusion molding: After the aluminum alloy ingot is heated to 530°C at a temperature gradient of 7°C / min, it is extruded in an extruder, wherein the extrusion barrel temperature is 430°C, the extrusion die temperature is 480°C, and the extrusion speed is 5 m / min; (6) Heat treatment: subject the extruded product in step (5) to an online solution quenching treatment at 530° C. for 1.5 h; (7) Aging treatment: the product subjected to the heat treatment in step (6) is kept at 185°C for 180 min; (8) Stretching and straightening: The product heat treated in step (7) is stretched and straightened with a stretching amount of 3% to obtain a high-strength aluminum alloy profile for an anti-collision beam. Example

[0022] A high-strength aluminum alloy profile for an anti-collision beam, wherein the components of the aluminum alloy profile are Si: 0.57%; Fe: 0.16%; Cu: 0.30%; Mn: 0.10%; Mg: 0.98%; Cr: 0.16%; Zn: 0.08%; Ti: 0.12%; Ce: 0.08%; Ge: 0.03%; Sc: 0.010%; the remainder is Al and unavoidable impurities. The preparation method thereof is as follows: (1) Melting: Add an aluminum ingot into a melting furnace and set the temperature of the melting furnace to 750°C. When the temperature of the aluminum ingot rises to the set value and begins to melt, add powdered Mn and Cr into the melting furnace, then add aluminum-silicon master alloy, aluminum-iron master alloy, pure copper, magnesium ingot, aluminum-zinc master alloy, aluminum-titanium master alloy, aluminum-germanium master alloy and aluminum-scandium master alloy, and finally add cerium-aluminum master alloy and stir. Stir evenly at 750°C until the materials are completely melted to obtain aluminum alloy melt. (2) Filtration: The aluminum alloy melt is filtered using a double-stage ceramic filter plate with mesh sizes of 30 and 60, respectively, to obtain a molten alloy to be used; (3) Casting: Cast the alloy liquid to be used into an aluminum rod, and then place it at 700°C for 1 hour to obtain a billet; (4) Homogenization treatment: placing the billet in a homogenization treatment device and keeping it at 550°C for 7 hours to obtain a homogenized aluminum alloy ingot; (5) Extrusion molding: After the aluminum alloy ingot is heated to 530°C at a temperature gradient of 7°C / min, it is extruded in an extruder, wherein the extrusion barrel temperature is 430°C, the extrusion die temperature is 480°C, and the extrusion speed is 5 m / min; (6) Heat treatment: subject the extruded product in step (5) to an online solution quenching treatment at 530° C. for 1.5 h; (7) Aging treatment: the product subjected to the heat treatment in step (6) is kept at 185°C for 180 min; (8) Stretching and straightening: The product heat treated in step (7) is stretched and straightened with a stretching amount of 3% to obtain a high-strength aluminum alloy profile for an anti-collision beam. Example

[0023] A high-strength aluminum alloy profile for an anti-collision beam, wherein the components of the aluminum alloy profile are Si: 0.57%; Fe: 0.16%; Cu: 0.30%; Mn: 0.10%; Mg: 0.98%; Cr: 0.16%; Zn: 0.08%; Ti: 0.12%; Ce: 0.08%; Ge: 0.03%; Sc: 0.012%; the remainder is Al and unavoidable impurities. The preparation method thereof is as follows: (1) Melting: Add an aluminum ingot into a melting furnace and set the temperature of the melting furnace to 750°C. When the temperature of the aluminum ingot rises to the set value and begins to melt, add powdered Mn and Cr into the melting furnace, then add aluminum-silicon master alloy, aluminum-iron master alloy, pure copper, magnesium ingot, aluminum-zinc master alloy, aluminum-titanium master alloy, aluminum-germanium master alloy and aluminum-scandium master alloy, and finally add cerium-aluminum master alloy and stir. Stir evenly at 750°C until the materials are completely melted to obtain aluminum alloy melt. (2) Filtration: The aluminum alloy melt is filtered using a double-stage ceramic filter plate with mesh sizes of 30 and 60, respectively, to obtain a molten alloy to be used; (3) Casting: Cast the alloy liquid to be used into an aluminum rod, and then place it at 700°C for 1 hour to obtain a billet; (4) Homogenization treatment: placing the billet in a homogenization treatment device and keeping it at 550°C for 7 hours to obtain a homogenized aluminum alloy ingot; (5) Extrusion molding: After the aluminum alloy ingot is heated to 530°C at a temperature gradient of 7°C / min, it is extruded in an extruder, wherein the extrusion barrel temperature is 430°C, the extrusion die temperature is 480°C, and the extrusion speed is 5 m / min; (6) Heat treatment: subject the extruded product in step (5) to an online solution quenching treatment at 530° C. for 1.5 h; (7) Aging treatment: the product subjected to the heat treatment in step (6) is kept at 185°C for 180 min; (8) Stretching and straightening: The product heat treated in step (7) is stretched and straightened with a stretching amount of 3% to obtain a high-strength aluminum alloy profile for an anti-collision beam. Example

[0024] A high-strength aluminum alloy profile for a bumper beam. The components of this aluminum alloy profile by mass percentage are as follows: Si: 0.57%; Fe: 0.16%; Cu: 0.30%; Mn: 0.10%; Mg: 0.98%; Cr: 0.16%; Zn: 0.08%; Ti: 0.12%; Ce: 0.08%; Ge: 0.03%; Sc: 0.015%; the balance is Al and unavoidable impurities. The preparation method steps are as follows: (1) Melting: Add aluminum ingots into a melting furnace, set the temperature of the melting furnace to 750 °C. When the temperature of the aluminum ingots rises to the set value and starts to melt, add powdery Mn and Cr into the melting furnace, then add aluminum-silicon master alloy, aluminum-iron master alloy, pure copper, magnesium ingots, aluminum-zinc master alloy, aluminum-titanium master alloy, aluminum-germanium master alloy, and aluminum-scandium master alloy. Finally, add cerium-aluminum master alloy and stir. Stir evenly at 750 °C until the materials are completely melted to obtain an aluminum alloy melt; (2) Filtration: Filter the aluminum alloy melt with double-stage ceramic filter plates with mesh numbers of 30 and 60 respectively to obtain a ready-to-use alloy liquid; (3) Casting: Cast the ready-to-use alloy liquid into aluminum bars, and then let it stand at 700 °C for 1 h to obtain blanks; (4) Homogenization treatment: Place the blanks in a homogenization treatment equipment, keep them at 550 °C for 7 h to obtain homogenized aluminum alloy ingots; (5) Extrusion forming: Heat the aluminum alloy ingots to 530 °C at a temperature gradient of 7 °C / min, and then extrude them in an extruder. Among them, the temperature of the extrusion cylinder is 430 °C, the temperature of the extrusion die is 480 °C, and the extrusion speed is 5 m / min; (6) Heat treatment: Perform online solution quenching treatment on the product extruded in step (5) at 530 °C and keep it warm for 1.5 h; (7) Aging treatment: Keep the product heat-treated in step (6) at 185 °C for 180 min; (8) Stretch straightening: Perform stretch straightening on the product heat-treated in step (7) with a stretching amount of 3% to obtain a high-strength aluminum alloy profile for a bumper beam.

[0025] Comparative Example 1 The difference compared with Example 1 is that: the aluminum alloy profile does not contain Ge.

[0026] Comparative Example 2 The difference compared with Example 1 is that: the Ge content in the aluminum alloy profile is 0.015%.

[0027] Comparative Example 3 The difference compared with Example 1 is that: the Ge content in the aluminum alloy profile is 0.06%.

[0028] Comparative Example 4 The difference compared with Example 1 is that the aluminum alloy profile does not contain Ge but contains 0.05% of Sc.

[0029] Comparative Example 5 The difference compared with Example 1 is that the aluminum alloy profile does not contain Ge but contains 0.1% of Sc.

[0030] Comparative Example 6 The difference compared with Example 2 is that the Sc content in the aluminum alloy profile is 0.008%.

[0031] Comparative Example 7 The difference compared with Example 2 is that the Sc content in the aluminum alloy profile is 0.02%.

[0032] Test Example With reference to the standard GB / T228.1-2021 "Metallic materials - Tensile testing - Part 1: Method of test at room temperature", the tensile strength, yield strength and elongation of the aluminum alloy profiles of the examples and comparative examples were tested, and the results are shown in Table 1.

[0033] Table 1 Tensile property test results of aluminum alloy profiles

[0034] It can be seen from the test results in Table 1 that compared with Comparative Examples 1 to 3, Example 1 has higher tensile strength, yield strength and elongation. Comparative Example 1 did not add Ge, and the Ge contents in the aluminum alloy profiles of Comparative Example 2, Example 1 and Comparative Example 3 were 0.015%, 0.03% and 0.06% respectively. This is because Ge, as an element in the same group as Si, appropriate content of Ge can replace part of Si, forming a composite phase with higher density and better coherency with the matrix than Si, thus enhancing the strength of the aluminum alloy. The role of less Ge is not strong and the improvement is not obvious; while more Ge will form segregation phases, resulting in a decrease in the elongation of the aluminum alloy profile. Compared with Example 1, Examples 2 to 4 and Comparative Examples 5 to 7 have higher tensile strength, yield strength and elongation. This is because Sc and Al can form nano-scale Al3Sc precipitation phases, refining the strength of the alloy. The solubility of Sc is also relatively low, having the effects of solid solution strengthening and inhibiting recrystallization. Comparative Example 5 without Ge but with a Sc content of 0.1% also shows good performance, but it is inferior to Example 3; and the improvement of Comparative Example 4 without Ge but with a Sc content of 0.1% is not obvious, which indicates that adding Sc alone requires a certain content to have good effects. These results also illustrate that Ge and Sc have a certain synergistic effect. The composite phase formed by Ge replacing part of Si forms a more stable structure with the Al3Sc precipitation phase, and optimizing the contents of Ge and Sc can further optimize the structure.

[0035] The yield strengths of the aluminum alloy profiles in the examples and comparative examples were also tested after heat preservation at 200 °C for 1 h, and the retention rates of the yield strengths before and after heat preservation were calculated. The results are shown in Table 2.

[0036] Table 2 Retention Rate of Yield Strength

[0037] It can also be seen from the results in Table 2 that Example 3 of the present invention has the best heat resistance.

[0038] The aluminum alloy profiles with the same cross-section in the examples and comparative examples were tested for the absorbed energy during the three-point bending test. The greater the absorbed energy of the material per unit wall thickness, the better the lightweight and impact resistance effects of the aluminum alloy profile. The results are shown in Table 3.

[0039] Table 3 Results of Absorbed Energy

[0040] It can also be seen from the results in Table 3 that the preferred examples of the present invention have the highest absorbed energy, indicating that the lightweight and impact resistance effects are better per unit volume.

[0041] In summary, the present invention optimizes the composition of the 6-series aluminum alloy, reduces the contents of Fe and Zn, and introduces a small amount of Ge. Ge can replace part of Si to form a composite phase with a higher density and better coherency with the matrix compared to Si, thereby improving the strength of the aluminum alloy. In addition, Sc is also introduced, and Sc and Ge play a good synergistic role with other elements, significantly improving the strength and toughness of the aluminum alloy.

[0042] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-strength aluminum alloy profile for a bumper beam, characterized in that, Comprising, by mass percentage, Si: 0.42% - 0.62%; Fe: 0.15% - 0.30%; Cu: 0.18% - 0.35%; Mn: ≤0.15%; Mg: 0.87% - 1.07%; Cr: 0.06% - 0.24%; Zn: ≤0.10%; Ti: 0.02% - 0.14%; rare earth of La series: 0.05% - 0.15%; Ge: 0.02% - 0.05%; the balance being Al and unavoidable impurities.

2. The high-strength aluminum alloy profile for a bumper beam according to claim 1, characterized in that, In addition to Al and unavoidable impurities, it also contains 0.01% - 0.03% of Sc.

3. The high-strength aluminum alloy profile for a bumper beam according to claim 2, characterized in that, The mass ratio of the Sc to the Ge is 1:2 - 3.

4. A preparation method of a high-strength aluminum alloy profile for a bumper beam as described in any one of claims 1 to 3, characterized in that, Comprising, After melting aluminum ingots, add Mn and Cr, then add other raw materials except rare earth, and finally add aluminum rare earth alloy for smelting to obtain an aluminum alloy melt; Filter the aluminum alloy melt to obtain a standby alloy liquid; Cast the standby alloy liquid into a blank; Perform homogenization, extrusion forming, heat treatment, aging treatment, and stretch leveling on the blank in sequence to obtain a high-strength aluminum alloy profile for a bumper beam.

5. The preparation method of the high-strength aluminum alloy profile for the anti-collision beam according to claim 4, characterized in that, The temperature of the smelting is 650 - 800 °C; The homogenization is carried out at 530 - 580 °C for 6 - 8 h; The temperature of the heat treatment is 500 - 560 °C.

6. The preparation method of the high-strength aluminum alloy profile for the anti-collision beam according to claim 4, characterized in that, The filtration is carried out using a two-stage ceramic filter plate, and the mesh numbers of the two-stage ceramic filter plate are 30 - 40 meshes and 50 - 60 meshes respectively.

7. The preparation method of the high-strength aluminum alloy profile for the anti-collision beam according to claim 4, characterized in that, During the extrusion forming, the blank after homogenization is heated to 500 - 560 °C at a temperature gradient of 6 - 8 °C / min, and then extruded and formed at an extrusion speed of 4 - 6 m / min using an extrusion die at 460 - 500 °C.

8. The preparation method of the high-strength aluminum alloy profile for the anti-collision beam according to claim 4, characterized in that, The aging treatment is carried out at 185 ± 5 °C for 120 - 240 min.

9. The preparation method of the high-strength aluminum alloy profile for the anti-collision beam according to claim 4, characterized in that, The stretching amount of the stretch leveling is 1% - 5%.

10. The preparation method of the high-strength aluminum alloy profile for the anti-collision beam according to any one of claims 4 to 9, characterized in that, Before the standby alloy liquid is cast into a blank, it is also left standing at 660 - 770 °C for 0.5 - 2 h.

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