CN109207811B - Preparation method and application of aluminum alloy profile - Google Patents
Preparation method and application of aluminum alloy profile Download PDFInfo
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- CN109207811B CN109207811B CN201811390495.8A CN201811390495A CN109207811B CN 109207811 B CN109207811 B CN 109207811B CN 201811390495 A CN201811390495 A CN 201811390495A CN 109207811 B CN109207811 B CN 109207811B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
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Abstract
The invention provides a preparation method and application of an aluminum alloy section, wherein the production process comprises the following steps: (1) preparing an aluminum alloy ingot; (2) heating the aluminum alloy cast ingot; (3) extruding treatment; (4) quenching treatment; (5) and (3) aging treatment, wherein the aging treatment temperature is 175 +/-5 ℃, and the time is 5.5 +/-0.2 h. The aluminum alloy ingot used in the invention has excellent performance, can be used for producing aluminum alloy products for automobiles, aluminum alloy products for the power industry, aluminum alloy products for rail transit, aluminum alloy products for communication equipment and aluminum alloy products for machining mechanical parts, has good mechanical property and long service life, is aged at 175 +/-5 ℃ for 5.5 +/-0.2 h after being parked for 6 months, still has qualified mechanical property, has better storage aging, and has simple process, economy and high efficiency.
Description
Technical Field
The invention relates to the technical field of aluminum alloy processing, in particular to a preparation method and application of an aluminum alloy profile.
Technical Field
The aluminum alloy is an alloy material prepared by adding some alloy elements into pure aluminum, such as Al-Mn alloy developed by adding manganese elements into pure aluminum, Al-Cu alloy developed by adding copper elements into pure aluminum, Al-Cu-Mg series duralumin alloy developed by simultaneously adding copper and magnesium elements into pure aluminum, and the like. Compared with other materials, the aluminum alloy has excellent comprehensive properties, such as small density, excellent corrosion resistance, good plasticity and processability, strong electric and thermal conductivity, low-temperature brittleness resistance, radiation resistance and the like, and is widely applied to the fields of aviation, aerospace, mechanical manufacturing, ships, automobiles and the like.
With the development of light weight of automobiles, the market puts forward the requirements of lighter weight and higher performance on automobile parts. At present, the domestic steamThe structural products of the vehicle, such as the anti-collision beams and the cross beams, are mostly made of 6061, 6082 and 6A01 series aluminum alloy, but the mechanical properties of the structural products can only barely meet the requirements of the national standard GB/T6892-2015 (namely the specification of 6082T6 products with the wall thickness less than or equal to 5.00 mm: tensile strength RmNot less than 290MPa, non-proportional elongation strength Rp0.2Greater than or equal to 250MPa and elongation percentage A after fracture50mm is more than or equal to 6 percent), and the fatigue resistance and the parking effect of the aluminum profile are not considered, so that the part has great limitation on the overall strength, the service life and the storage.
Disclosure of Invention
The invention aims to provide a preparation method and application of an aluminum alloy section, the aluminum alloy ingot used in the preparation method has excellent performance, can be used for producing aluminum alloy products for automobiles, aluminum alloy products for the power industry, aluminum alloy products for rail transit, aluminum alloy products for communication equipment and aluminum alloy products for machining mechanical parts, has good mechanical property and long service life, is aged at 175 +/-5 ℃ for 5.5 +/-0.2 h after being parked for 6 months, is still qualified in mechanical property, has better storage aging, and is simple in process, economic and efficient.
The invention is realized by the following technical scheme:
in fact, the present invention relates to a method for the preparation of an aluminium alloy profile, comprising the steps of:
(1) preparing an aluminum alloy ingot;
(2) heating the aluminum alloy ingot casting in the step (1);
(3) extruding the heated aluminum alloy;
(4) carrying out online quenching treatment on the extruded aluminum alloy;
(5) stretching and sizing saw cutting treatment is carried out on the aluminum alloy subjected to the on-line quenching treatment;
(6) aging the aluminum alloy subjected to the sizing and sawing treatment at 175 +/-5 ℃ for 5.5 +/-0.2 h;
the aluminum alloy cast ingot comprises the following chemical components in percentage by mass: si: 1.00% -1.20%, Fe: less than or equal to 0.25 percent, Cu: 0.12-0.15%, Mn: 0.50-0.55%, Mg: 0.80-0.95%, Cr: less than or equal to 0.12 percent, Ni: less than or equal to 0.01 percent, Zn: less than or equal to 0.01 percent, Ti: less than or equal to 0.01 percent, and the balance of Al and impurities.
The technical scheme refines the components of the alloy by adjusting the contents of main alloying elements Si, Cu, Mn and Mg, enables the alloying elements to be recombined, promotes the distribution homogenization of aluminum alloy tissues, and further increases the reinforcing phase Mg2Si, the mechanical property of the aluminum alloy is obviously improved.
As another specific embodiment, the aluminum alloy ingot contains the following chemical components in percentage by mass: si: 1.10%, Fe: less than or equal to 0.25 percent, Cu: 0.13%, Mn: 0.52%, Mg: 0.85%, Cr: less than or equal to 0.12 percent, Ni: less than or equal to 0.01 percent, Zn: less than or equal to 0.01 percent, Ti: less than or equal to 0.01 percent, and the balance of Al and impurities.
As another specific embodiment, the aluminum alloy ingot contains the following chemical components in percentage by mass: si: 1.10%, Fe: less than or equal to 0.25 percent, Cu: 0.13%, Mn: 0.53%, Mg: 0.85%, Cr: less than or equal to 0.12 percent, Ni: less than or equal to 0.01 percent, Zn: less than or equal to 0.01 percent, Ti: less than or equal to 0.01 percent, and the balance of Al and impurities.
As another specific embodiment, the aluminum alloy ingot contains the following chemical components in percentage by mass: si: 1.15%, Fe: less than or equal to 0.25 percent, Cu: 0.13%, Mn: 0.53%, Mg: 0.90%, Cr: less than or equal to 0.12 percent, Ni: less than or equal to 0.01 percent, Zn: less than or equal to 0.01 percent, Ti: less than or equal to 0.01 percent, and the balance of Al and impurities.
In another specific embodiment, in the step (2), the heating temperature is 480 to 500 ℃.
In another specific embodiment, in the step (3), the extrusion ratio λ is 30-60, and the extrusion speed is 4-10 m/min; more preferably, the extrusion ratio λ is 33.96 and the extrusion speed is 3m/min to 8 m/min.
As another specific embodiment, in the step (3), the material temperature in the extrusion treatment is 530 ℃ to 550 ℃; further preferably, the temperature of the discharge port is 535-545 ℃.
As another specific embodiment, the quenchingThe temperature of the product is less than or equal to 50 ℃; by controlling the quenching temperature, the solution heat treatment effect of the aluminum alloy product can be improved, the solution heat treatment effect is sufficient in the temperature range, and the phase Mg in the aluminum alloy product can be further strengthened2Si is precipitated, so that the tensile strength and hardness of the aluminum alloy are further increased, and the toughness of the product is promoted.
Meanwhile, the invention also provides application of the aluminum alloy section obtained by the preparation method in an automobile structural member.
As one of the specific applications, is an aluminum alloy product prepared by the following process:
(1) preparing an aluminum alloy ingot, wherein the aluminum alloy ingot comprises the following components in percentage by mass:
si: 1.10% -1.15%, Fe: less than or equal to 0.25 percent, Cu: 0.13-0.14%, Mn: 0.52-0.53%, Mg: 0.85% -0.90%, Cr: less than or equal to 0.12 percent, Ni: less than or equal to 0.01 percent, Zn: less than or equal to 0.01 percent, Ti: less than or equal to 0.01 percent, and the balance of Al and impurities;
(2) heating the aluminum alloy ingot casting in the step (1) at 480-500 ℃, heating the mold to 460-480 ℃, and heating the ingot holding barrel to 420-460 ℃;
(3) adding the aluminum alloy cast ingot heated in the step (2) into a heated ingot containing barrel for extrusion treatment, wherein the extrusion ratio lambda is 33.96, the extrusion speed is 3-8 m/min, and the temperature of a discharge port is 535-555 ℃;
(4) quenching the extruded aluminum alloy, wherein the quenching mode adopts water cooling quenching, and the temperature of the quenched product is controlled to be less than or equal to 50 ℃;
(5) stretching and sizing saw cutting treatment is carried out on the aluminum alloy subjected to the on-line quenching treatment;
(6) and (3) carrying out aging treatment on the aluminum alloy subjected to the sizing saw cutting treatment at the temperature of 175 +/-5 ℃ for 5.5 +/-0.2 h to obtain an aluminum alloy product.
SGS test is carried out on the obtained aluminum alloy automobile anti-collision beam, and the tensile strength R of the product ism367 to 383MPa, and the non-proportional elongation strength Rp0.2327 to 348MPa, elongation after fracture A50mm is 16.5-19.0%
Meanwhile, the invention also provides application of the aluminum alloy section obtained by the preparation method in processing of aluminum for the power industry, aluminum for rail transit, aluminum for communication equipment and mechanical parts.
Compared with the prior art, the scheme of the invention has the beneficial effects that:
(1) the invention provides a preparation method of an aluminum alloy section, a product produced by the process has excellent mechanical properties, and the product has tensile strength R through SGS testmNot less than 360MPa, non-proportional elongation strength Rp0.2Not less than 320MPa, elongation after break A50mm is more than or equal to 16 percent, and the mm far exceeds the specified requirements of national standard GB/T6892-2015;
(2) the production process has better storage aging, and the mechanical property of the product is still qualified after the product is placed for 6 months and then aged at 175 +/-5 ℃ for 5.5 +/-0.2 h, thereby prolonging the service life of the product and providing guarantee for later use of the product;
(3) the invention has simple production process and economic cost, and is easy to realize large-scale industrial production;
(4) the aluminum alloy section produced by the invention has wide application, can be used for manufacturing aluminum alloy products for automobiles, aluminum alloy products for the power industry, aluminum alloy products for rail transit, aluminum alloy products for communication equipment, machining mechanical parts and the like, has excellent performance, can completely meet the actual requirements on the market, and improves the international competitiveness of domestic special aluminum profiles.
Detailed Description
The present invention is described in further detail below by way of specific examples and comparative examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
It should be noted that "comprising" in this technical solution means that it may include other components in addition to the components, and the "comprising" may be replaced by "being" or "consisting of … …" in a closed manner.
The balance of Al in the technical scheme is Al except Si, Fe, Cu, Mn, Mg, Cr, Ni, Zn, Ti and other elements in the components of the aluminum alloy ingot, and the sum of the weight percentages of Al, Si, Fe, Cu, Mn, Mg, Cr, Ni, Zn, Ti and other elements is 100%.
The aging treatment in the technical scheme refers to a heat treatment process that a metal or alloy workpiece is quenched at high temperature or subjected to certain cold working deformation and then is placed at higher temperature or room temperature, so that the performance of the metal or alloy workpiece changes along with time, wherein the aging treatment temperature is 175 +/-5 ℃, such as 170 ℃, 172 ℃, 174 ℃, 175 ℃, 176 ℃, 178 ℃ or 180 ℃; the time is 5.5 +/-0.2 h, such as 5.3h, 5.4h, 5.5h, 5.6h and 5.7 h.
Wherein the heating is heating an aluminum alloy ingot.
The extrusion treatment is to stretch the aluminum alloy ingot under the action of the die by using an extrusion device to improve the mechanical property of the material and also to perform the compression molding, wherein the extrusion device can be a spindle containing barrel extruder or similar equipment.
Wherein, the online quenching treatment is to carry out online quenching through a quenching box in a water cooling mode.
Example 1
A preparation method of an aluminum alloy profile comprises the following steps:
(1) preparing an aluminum alloy ingot, wherein the aluminum alloy ingot comprises the following components in percentage by mass:
si: 1.00%%, Fe: 0.25%, Cu: 0.15%, Mn: 0.50%, Mg: 0.80%, Cr: 0.12%, Ni: 0.01%, Zn: 0.01%, Ti: 0.01 percent, and the balance of Al and impurities;
(2) heating the aluminum alloy ingot casting in the step (1) by adopting a multi-rod hot shearing furnace at 480 ℃, heating the mold to 460 ℃, and heating the ingot holding barrel to 420 ℃;
(3) adding the aluminum alloy cast ingot heated in the step (2) into a heated ingot containing barrel for extrusion treatment, wherein the extrusion ratio lambda is 30, the extrusion speed is 4m/min, and the temperature of a discharge port is 530 ℃;
(4) carrying out on-line quenching treatment on the extruded aluminum alloy, and controlling the temperature of a quenched product to be less than or equal to 50 ℃;
(5) stretching and sizing the aluminum alloy product after quenching treatment;
(5) stretching and sizing saw cutting the quenched aluminum alloy;
(6) and (3) carrying out aging treatment on the aluminum alloy subjected to the sizing saw cutting treatment, wherein the aging treatment temperature is 175 ℃, and the time is 5.5h, and carrying out sampling and mechanical property testing on the prepared product.
Example 2
A preparation method of an aluminum alloy profile comprises the following steps:
(1) preparing an aluminum alloy ingot, wherein the aluminum alloy ingot comprises the following components in percentage by mass:
si: 1.20%, Fe: 0.15%, Cu: 0.12%, Mn: 0.55%, Mg: 0.95%, Cr: 0.08%, Ni: 0.005%, Zn: 0.006%, Ti: 0.006 percent, and the balance of Al and impurities;
(2) heating the aluminum alloy ingot casting in the step (1) by adopting a multi-rod hot shearing furnace at the temperature of 500 ℃, heating the mold to 480 ℃, and heating the ingot holding barrel to 460 ℃;
(3) adding the aluminum alloy cast ingot heated in the step (2) into a heated ingot containing barrel for extrusion treatment, wherein the extrusion ratio lambda is 60, the extrusion speed is 10m/min, and the temperature of a discharge hole is 550 ℃;
(4) carrying out online quenching treatment on the extruded aluminum alloy, and controlling the temperature of a quenched product to be less than or equal to 50 ℃;
(5) stretching and sizing saw cutting the quenched aluminum alloy;
(6) and (3) carrying out aging treatment on the aluminum alloy subjected to the sizing saw cutting treatment, wherein the aging treatment temperature is 170 ℃, and the time is 5.7h, and carrying out sampling and mechanical property testing on the prepared product.
Example 3
A preparation method of an aluminum alloy profile comprises the following steps:
(1) preparing an aluminum alloy ingot, wherein the aluminum alloy ingot comprises the following components in percentage by mass:
si: 1.10%, Fe: 0.22%, Cu: 0.13%, Mn: 0.52%, Mg: 0.85%, Cr: 0.05%, Ni: 0.008%, Zn: 0.005%, Ti: 0.008% and the balance of Al and impurities;
(2) heating the aluminum alloy ingot casting in the step (1) by adopting a multi-rod hot shearing furnace at the temperature of 485 ℃, heating the mold to 465 ℃, and heating the ingot holding barrel to 430 ℃;
(3) adding the aluminum alloy cast ingot heated in the step (2) into a heated ingot containing barrel for extrusion treatment, wherein the extrusion ratio lambda is 33.96, the extrusion speed is 3m/min, and the temperature of a discharge hole is 535 ℃;
(4) carrying out online quenching treatment on the extruded aluminum alloy, and controlling the temperature of a quenched product to be less than or equal to 50 ℃;
(5) stretching and sizing saw cutting the quenched aluminum alloy;
(6) and (3) carrying out aging treatment on the aluminum alloy subjected to the sizing saw cutting treatment, wherein the aging treatment temperature is 180 ℃, and the time is 5.3h, and carrying out sampling and mechanical property testing on the prepared product.
Example 4
A preparation method of an aluminum alloy profile comprises the following steps:
(1) preparing an aluminum alloy ingot, wherein the aluminum alloy ingot comprises the following components in percentage by mass:
si: 1.05%, Fe: 0.18%, Cu: 0.14%, Mn: 0.54%, Mg: 0.90%, Cr: 0.07%, Ni: 0.005%, Zn: 0.006%, Ti: 0.008% and the balance of Al and impurities;
(2) heating the aluminum alloy ingot casting in the step (1) by adopting a multi-rod hot shearing furnace at the temperature of 490 ℃, heating the mold to 470 ℃, and heating the ingot holding cylinder to 440 ℃;
(3) adding the aluminum alloy cast ingot heated in the step (2) into a heated ingot containing barrel for extrusion treatment, wherein the extrusion ratio lambda is 26, the extrusion speed is 8m/min, and the temperature of a discharge hole is 545 ℃;
(4) carrying out online quenching treatment on the extruded aluminum alloy, and controlling the temperature of a quenched product to be less than or equal to 50 ℃;
(5) stretching and sizing saw cutting the quenched aluminum alloy;
(6) and (3) carrying out aging treatment on the aluminum alloy subjected to the sizing sawing treatment at the temperature of 174 ℃ for 5.4h, and carrying out sampling and mechanical property testing on the prepared product.
Example 5
A preparation method of an aluminum alloy profile comprises the following steps:
(1) preparing an aluminum alloy ingot, wherein the aluminum alloy ingot comprises the following components in percentage by mass:
si: 1.15%, Fe: 0.16%, Cu: 0.13%, Mn: 0.53%, Mg: 0.88%, Cr: 0.09%, Ni: 0.009%, Zn: 0.007%, Ti: 0.007% and the balance of Al and impurities;
(2) heating the aluminum alloy ingot casting in the step (1) by adopting a multi-rod hot shearing furnace under the condition that the temperature is 495 ℃, heating the mold to 475 ℃, and heating the ingot holding barrel to 450 ℃;
(3) adding the aluminum alloy cast ingot heated in the step (2) into a heated ingot containing barrel for extrusion treatment, wherein the extrusion ratio lambda is 33.96, the extrusion speed is 7m/min, and the temperature of a discharge hole is 540 ℃;
(4) carrying out online quenching treatment on the extruded aluminum alloy, and controlling the temperature of a quenched product to be less than or equal to 50 ℃;
(5) stretching and sizing saw cutting the quenched aluminum alloy;
(6) and (3) carrying out aging treatment on the aluminum alloy subjected to the sizing saw cutting treatment, wherein the aging treatment temperature is 177 ℃, the time is 5.6h, and the prepared product is subjected to sampling and mechanical property testing.
Comparative example 1
A preparation method of an aluminum alloy profile comprises the following steps:
(1) preparing an aluminum alloy ingot, wherein the aluminum alloy ingot comprises the following components in percentage by mass:
si: 1.00%%, Fe: 0.25%, Cu: 0.15%, Mn: 0.50%, Mg: 0.80%, Cr: 0.12%, Ni: 0.01%, Zn: 0.01%, Ti: 0.01 percent, and the balance of Al and impurities;
(2) heating the aluminum alloy ingot casting in the step (1) by adopting a multi-rod hot shearing furnace at 480 ℃, heating the mold to 460 ℃, and heating the ingot holding barrel to 420 ℃;
(3) adding the aluminum alloy cast ingot heated in the step (2) into a heated ingot containing barrel for extrusion treatment, wherein the extrusion ratio lambda is 30, and the temperature of a discharge port is 535 ℃;
(4) carrying out online quenching treatment on the extruded aluminum alloy, and controlling the temperature of a quenched product to be less than or equal to 50 ℃;
(5) stretching and sizing saw cutting the quenched aluminum alloy;
(6) and (3) carrying out aging treatment on the aluminum alloy subjected to the sizing saw cutting treatment, wherein the aging treatment temperature is 145 ℃, and the aging treatment time is 10 hours, and carrying out sampling and mechanical property testing on the prepared product.
Comparative example 2:
different from the concrete comparative example 1, the aging treatment temperature of the comparative example is 145 ℃, the time is 10 hours, and the prepared product is subjected to sampling and mechanical property testing.
Comparative example 3
Different from the specific comparative example 1, the aging treatment temperature of the comparative example is 175 ℃, the time is 8 hours, and the prepared product is subjected to sampling and mechanical property testing.
Comparative example 4
Different from the specific comparative example 1, the aging treatment temperature of the comparative example is 175 ℃, the time is 8 hours, and the prepared product is subjected to sampling and mechanical property testing.
Comparative example 5
Different from the specific comparative example 1, the aging treatment temperature of the comparative example is 195 ℃ and the time is 6h, and the prepared product is sampled and tested for mechanical properties.
Comparative example 6
Different from the specific comparative example 1, the aging treatment temperature of the comparative example is 195 ℃ and the time is 6h, and the prepared product is sampled and tested for mechanical properties.
After SGS testing of samples taken from the finished products obtained in the above examples and comparative examples, the relevant test results are shown in Table 1 below:
in conclusion, the product produced by the technical scheme of the invention has excellent mechanical property, and the product has tensile strength R through SGS testmNot less than 360MPa, non-proportional elongation strength Rp0.2Not less than 320MPa, elongation after break A50mm is more than or equal to 16 percent, which far exceeds the specified requirements of the national standard GB/T6892-2015, and the method can completely meet the actual requirements on the market.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The preparation method of the aluminum alloy profile is characterized by comprising the following steps of:
(1) preparing an aluminum alloy ingot;
(2) heating the aluminum alloy ingot casting in the step (1);
(3) extruding the heated aluminum alloy;
(4) quenching the extruded aluminum alloy;
(5) stretching and sizing saw cutting treatment is carried out on the aluminum alloy subjected to the on-line quenching treatment;
(6) aging the aluminum alloy subjected to the sizing and sawing treatment at 175 +/-5 ℃ for 5.5 +/-0.2 h;
the aluminum alloy cast ingot comprises the following components in percentage by mass: si: 1.00% -1.20%, Fe: less than or equal to 0.25 percent, Cu: 0.12-0.15%, Mn: 0.50-0.55%, Mg: 0.80-0.95%, Cr: less than or equal to 0.12 percent, Ni: less than or equal to 0.01 percent, Zn: less than or equal to 0.01 percent, Ti: less than or equal to 0.01 percent, and the balance of Al and impurities;
in the step (2), the heating temperature is 480-500 ℃; in the step (3), the extrusion ratio lambda of the extrusion treatment is 30-60, and the extrusion speed is 4-10 m/min; in the step (3), the material temperature of the extrusion treatment is 530-550 ℃; the quenching adopts water cooling quenching, and the temperature of the quenched product is less than or equal to 50 ℃.
2. The preparation method according to claim 1, wherein the aluminum alloy ingot comprises the following components in percentage by mass: si: 1.10%, Fe: less than or equal to 0.25 percent, Cu: 0.13%, Mn: 0.52%, Mg: 0.85%, Cr: less than or equal to 0.12 percent, Ni: less than or equal to 0.01 percent, Zn: less than or equal to 0.01 percent, Ti: less than or equal to 0.01 percent, and the balance of Al and impurities.
3. The preparation method according to claim 1, wherein the aluminum alloy ingot comprises the following components in percentage by mass: si: 1.10%, Fe: less than or equal to 0.25 percent, Cu: 0.13%, Mn: 0.53%, Mg: 0.85%, Cr: less than or equal to 0.12 percent, Ni: less than or equal to 0.01 percent, Zn: less than or equal to 0.01 percent, Ti: less than or equal to 0.01 percent, and the balance of Al and impurities.
4. The preparation method according to claim 1, wherein the aluminum alloy ingot comprises the following components in percentage by mass: si: 1.15%, Fe: less than or equal to 0.25 percent, Cu: 0.13%, Mn: 0.53%, Mg: 0.90%, Cr: less than or equal to 0.12 percent, Ni: less than or equal to 0.01 percent, Zn: less than or equal to 0.01 percent, Ti: less than or equal to 0.01 percent, and the balance of Al and impurities.
5. The application of the aluminum alloy section obtained by the preparation method of any one of claims 1 to 4 in automobile structural parts.
6. The application of the aluminum alloy section obtained by the preparation method of any one of claims 1 to 4 in processing of aluminum for power industry, aluminum for rail transit, aluminum for communication equipment and mechanical parts.
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