High-conductivity super-heat-resistant aluminum alloy material and preparation method thereof

Abstract

The application belongs to the field of materials for aluminum alloy wires, and particularly relates to a high-conductivity super-heat-resistant aluminum alloy material and a preparation method thereof. The high-conductivity super-heat-resistant aluminum alloy material is composed of the following components in terms of weight fraction: Si: ≤0.05wt%, Fe: 0.08-0.18wt%, Zr: 0.2-0.4wt%, Y: 1.0-1.5wt%, Er: 0.5-1.0wt%, the sum of Cr, Mn, V and Ti being less than 0.003wt%, and the rest being Al and unavoidable impurities. The super-heat-resistant aluminum alloy material has excellent high-temperature mechanical properties, so that the super-heat-resistant aluminum alloy wire prepared therefrom can be normally operated at 210 DEG C for a long time, and the short-term temperature can reach 240 DEG C. The application provides a high-conductivity super-heat-resistant aluminum alloy material with a conductivity of ≥61.8% IACS, a heat resistance of ≥95%, and a tensile strength of 170-200 MPa.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of materials for aluminum alloy conductors, and particularly relates to a high-conductivity super-heat-resistant aluminum alloy material and a preparation method thereof. BACKGROUND

[0002] Aluminum alloy is an alloy with aluminum as the base and a certain amount of other alloying elements added. It is one of light metal materials. Its main alloying elements are copper, silicon, magnesium, zinc or manganese, followed by nickel, iron, titanium or chromium, etc. There are many varieties, most of which can be hardened by heat treatment. Because the specific gravity of aluminum is small, the strength per unit weight of aluminum alloy is close to that of high-quality steel.

[0003] Aluminum alloy is a kind of non-ferrous structural material widely used in industry, and has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industry. The rapid development of industrial economy has increased the demand for aluminum alloy welded structural parts, and the research on the weldability of aluminum alloy has also been deepened.

[0004] The early research and development of aluminum alloy is mainly related to the aviation industry, and has only a history of nearly a hundred years, but it has developed very quickly, and its application range has been continuously expanded. In metal materials, its output ranks second after steel, and in non-ferrous metal materials, it ranks first. Aluminum alloy will have great development: adopting new process methods, improving existing alloys, developing new alloys, giving new and more perfect use performance, expanding the use range, and increasing the use amount.

[0005] Heat-resistant conductors, i.e. appropriately increasing the allowable temperature of the conductor, can increase the system accident stability load flow, thereby improving the normal transmission capacity of the line. Through research, it is found that the addition of a proper amount of zirconium (Zr) element in aluminum material can improve the heat resistance of aluminum material. This discovery directly affects and leads to the development of steel-cored heat-resistant aluminum alloy stranded wire. The conductor has the technical characteristics of high temperature resistance and large transmission capacity. However, it also has the disadvantages of increased line loss and increased sag at high temperature, and high cost of the conductor, thereby affecting its application in long-distance transmission lines.

[0006] Super-heat-resistant aluminum alloy material has excellent high-temperature mechanical properties, so the super-heat-resistant aluminum alloy conductor prepared therefrom can be normally operated at 210℃ for a long time and at 240℃ for a short time. By virtue of this property, the operating rated voltage can be greatly increased, and the transmission loss can be reduced. However, most of the super-heat-resistant aluminum alloy conductors currently available can only achieve a single-wire conductivity of 60.1-61.5% IACS and a tensile strength of 160-180 MPa under the premise of ensuring heat resistance. The present application provides a high-conductivity super-heat-resistant aluminum alloy conductor material with a conductivity of ≥61.8% IACS, a heat resistance of ≥95%, and a tensile strength of 170-200 MPa. SUMMARY

[0007] The technical problem existing in the prior art is that the general super-heat-resistant performance is poor, the electrical conductivity is between 60.0-61.5 %IACS, the tensile strength is between 160-180 MPa, and the heat resistance is between 91 %-95 %. The specific problems are as follows:

[0008] 1. Low strength, large cross-sectional area of overhead conductor, large sag, limited conductor span distance, poor electrical performance, high energy consumption and large loss; 2. Zr element is easy to segregate and segregate unevenly; 3. The heat resistance is general; 4. After heat treatment, the grains are coarse, and the grains are different in size due to the different growth rates of the Zr element, the poor grain size consistency in the casting cooling process, and the uneven size of the second grains.

[0009] In order to solve the above technical problems, the application provides the following technical scheme:

[0010] The application provides a preparation method of a high-conductivity super-heat-resistant aluminum alloy material, comprising the following steps:

[0011] S1: melt the aluminum ingot, add AlB8 boron at 780-800 DEG C, and perform primary refining to obtain a first aluminum liquid; the mass ratio of AlB8 to aluminum alloy is 2-4:1000.

[0012] S2: after discarding the lower layer of the first aluminum liquid, adding an intermediate alloy at 740-780 DEG C, mixing, and obtaining a second aluminum liquid; the intermediate alloy is AlFe20, AlZr10, AlY10, AlEr10;

[0013] S3: performing secondary refining on the second aluminum liquid at 740-780 DEG C to obtain a third aluminum liquid;

[0014] S4: degassing and filtering the third aluminum liquid to obtain a fourth aluminum liquid;

[0015] S5: continuously casting the fourth aluminum liquid at 700-715 DEG C, and rolling to obtain an aluminum rod;

[0016] S6: after the aluminum rod is lowered to room temperature, heat treatment is performed, extrusion is performed at 510-530 DEG C, and cold drawing is performed to obtain the high-conductivity super-heat-resistant aluminum alloy material; the nominal diameter of the high-conductivity super-heat-resistant aluminum alloy material is 2.7-2.9 mm;

[0017] The high-conductivity super-heat-resistant aluminum alloy material is composed of the following components in terms of weight fraction: Si≤0.05wt%, Fe: 0.08-0.18wt%, Zr: 0.2-0.4wt%, Y: 1.0-1.5wt%, Er: 0.5-1.0wt%, the sum of Cr, Mn, V and Ti is less than 0.003wt%, and the rest is Al and unavoidable impurities;

[0018] The method of the heat treatment is: heating the aluminum rod to 420-460 DEG C within 3-4h, and then holding for 30-40h, and cooling to room temperature in the furnace.

[0019] Preferably, in the step S1, the method of the primary refining is: blowing nitrogen into the granular refining agent for primary refining, and then removing the surface dross of the aluminum liquid after standing for 10-20min.

[0020] Preferably, in the step S2, the method of the mixing is stirring for 40-50min.

[0021] Preferably, in the step S3, the method of the secondary refining is blowing argon into the sodium-removing refining agent, and then removing the dross after standing for 10-20min, and then standing for 30-40min to obtain the third aluminum liquid.

[0022] Preferably, in the step S5, when continuously casting, the speed of the casting is 6.5-7.5t / h, the temperature of the cooling water is 20-40 DEG C, and the ejection temperature is 500-540 DEG C.

[0023] Preferably, in the step S5, the rolling condition is: the rolling-in temperature is 480-520 DEG C, the final rolling temperature is 150-250 DEG C, and the rod collecting temperature is 90-120 DEG C.

[0024] Preferably, in the step S5, the nominal diameter of the aluminum rod is 14-16mm.

[0025] Preferably, in the step S6, the nominal diameter of the aluminum rod after the extrusion is 6-8mm.

[0026] Preferably, in the step S6, the deformation amount of the cold drawing is 24-26% each time, and the number of the cold drawing is 7-9 times.

[0027] The application also provides a high-conductivity super-heat-resistant aluminum alloy material prepared by the above preparation method.

[0028] The application adjusts the component proportion and improves the production process, adjusts the heat treatment process according to the component and performance, and achieves the performance of the high-conductivity super-heat-resistant aluminum alloy.

[0029] Compared with the prior art, the technical scheme of the application has the following advantages:

[0030] 1. The aluminum-boron particles are used for boronization treatment, the element B and the impurity elements such as Cr, Mn, V and Ti react more completely and thoroughly, the content of the impurity elements in the aluminum melt is reduced, and the conductivity is improved.

[0031] 2. When transferring the aluminum melt from the smelting furnace, only the upper and middle layers of the aluminum melt are transferred, avoiding the entry of high-density impurity compounds generated during boronization and refining into the next step, preventing such compounds from reacting again and entering the aluminum melt during alloying and refining treatment in the holding furnace, thereby affecting the electrical conductivity;

[0032] 3. Different refining agents are used at different stages to remove different impurities in steps and save material costs. In S1, granular refining agents are used. The granular refining agents have a long reaction time with the aluminum melt, and can fully react with the aluminum melt during the furnace standing period, removing alkali metal and non-metal oxide inclusions in the aluminum melt. The second aluminum liquid obtained in S2 has good purity, so sodium-removing refining agents are used in S3 to remove sodium elements, which are prone to form eutectic compounds with low melting points and melt during annealing and extrusion, causing organizational defects. Argon is used for refining to enhance the hydrogen removal effect. Hydrogen ions in the aluminum melt aggregate to form hollows during casting, affecting the extrusion performance.

[0033] 4. Formula: Zr elements can inhibit the recrystallization and growth of crystal structure, thereby improving the heat resistance of the material. However, Zr elements dissolved in the aluminum matrix have a great impact on the electrical resistivity, so the Zr elements are converted into precipitated Al3Zr through heat treatment, thereby improving the electrical conductivity of the material. Y elements play a role in rare earth optimization, combining with Si, Fe and other elements to form precipitated compounds, thereby improving the electrical conductivity and tensile strength. Y elements also form compounds with Er, which are pinned at grain boundaries to hinder grain growth, thereby improving the tensile strength and heat resistance.

[0034] 5. Annealing: Through 30-40h of heat treatment, Zr, Er and Y in the matrix are precipitated to form phases such as Al3Zr, Al3Er and Al3Y, and the grains hardly grow, thereby improving the electrical conductivity and maintaining the strength of the material.

[0035] 6. Extrusion and drawing: The problem of inconsistent grain size naturally exists during casting, and even after annealing, the problem still exists. Through extruding the material, the grain orientation is optimized, and the grain distribution is uniform, thereby improving the electrical conductivity and reducing the adverse effects of drawing on the electrical conductivity.

[0036] 7. The performance of the finished product reaches: tensile strength: 170-200MPa; electrical conductivity: 61.8-62.1%, elongation: 6-8%, heat resistance: 96.8-98.1%.

[0037] 8. Heat resistance: after 400h of heat preservation at 240℃, the residual rate of tensile strength is more than 95%, and after 1h of heat preservation at 280℃, the residual rate of tensile strength is 96.8-98.1%. DETAILED DESCRIPTION

[0038] The application will be further described in connection with the following specific embodiments so that those skilled in the art can better understand the application and implement it, but the embodiments are not intended to limit the application.

[0039] Example 1

[0040] The present embodiment provides a preparation method of a high-conductivity super-heat-resistant aluminum alloy material, and the specific components of the aluminum alloy material are as follows:

[0041] Si: ≤0.05wt%, Fe: 0.10wt%, Zr: 0.4wt%, Y: 1.4wt%, Er: 0.9wt%; the sum of Cr, Mn, V, and Ti is less than 0.003wt%, and the rest is Al and unavoidable impurities.

[0042] (1) An aluminum ingot with a purity of not less than 99.85% is added to a smelting furnace for heating and melting, and is kept at 800℃. An AlB8 alloy particle of 3kg per ton of aluminum water is added to the smelting furnace for boronization, a particle refiner is used, and nitrogen gas is blown in for primary refining. After standing for 15min, the scum on the surface of the aluminum liquid is removed, and after standing for 35min, a first aluminum liquid is obtained;

[0043] (2) The first aluminum liquid obtained in step (1) is transferred to a holding furnace, only the middle and upper layers of the aluminum liquid are transferred, and the lower layer of the aluminum liquid is not used. An intermediate alloy is added to the first aluminum liquid in the holding furnace, and stirred for 45min to obtain a second aluminum liquid; wherein the temperature of the holding furnace is 770℃, and the intermediate alloy is AlFe20, ALZr10, AlY10, and AlEr10, which are added at 2kg / t, 30kg / t, 143kg / t, and 81kg / t, respectively;

[0044] (3) After the second aluminum liquid is detected to be qualified, argon gas is blown in to remove sodium refiner for secondary refining, and after standing, the slag is removed, and the third aluminum liquid is obtained after standing for 35min again; wherein the secondary refining temperature is 770℃, and the standing time is 20min;

[0045] (4) The third aluminum liquid in the holding furnace is poured into a flow channel, and the aluminum liquid is degassed and filtered through a degassing tank and a filtering tank to obtain a fourth aluminum liquid;

[0046] (5) After obtaining the fourth aluminum liquid, continuous casting is performed, wherein the casting temperature is 712℃, the casting speed is 7.2t / h, the cooling water temperature is 20-40℃, and the ejection temperature is 530℃;

[0047] (6) The continuous billet obtained in step (5) is rolled to obtain an aluminum rod, wherein the aluminum rod has a nominal diameter of 15mm, the rolling-in temperature is 510℃, the final rolling temperature is 220℃, and the rod collecting temperature is 100℃;

[0048] (7) the aluminum rod obtained in step (6) is heat treated after being cooled to room temperature, heated to 460 DEG C in 4h, and kept for 30h, and then cooled to room temperature in the furnace after the heat preservation is over;

[0049] (8) the aluminum rod heat treated in step (7) is extruded to obtain an aluminum wire with a nominal diameter of 7.0mm; wherein the temperature of the extrusion die cavity is 525 DEG C;

[0050] (9) the aluminum wire obtained in step (8) is cold drawn with a deformation of 25% each time, and drawn to 2.8mm through 8 passes to obtain a high-conductivity super-heat-resistant aluminum alloy material.

[0051] Example 2

[0052] The embodiment provides a preparation method of a high-conductivity super-heat-resistant aluminum alloy material, and the specific components of the aluminum alloy material are as follows:

[0053] Si: ≤0.05wt%, Fe: 0.08wt%, Zr: 0.2wt%, Y: 1.0wt%, Er: 0.5wt%, the sum of Cr, Mn, V and Ti is less than 0.003wt%, and the rest is Al and unavoidable impurities.

[0054] (1) an aluminum ingot with a purity of not less than 99.85% is added into a smelting furnace to be heated and melted, boronization is performed by adding 2kg of AlB8 alloy particles per ton of aluminum water into the smelting furnace at 780 DEG C, granular refining agent is used, one-time refining is performed by blowing nitrogen, dross on the surface of the aluminum liquid is removed after 10min of standing, and the first aluminum liquid is obtained after 20-40min of standing;

[0055] (2) the first aluminum liquid obtained in step (1) is transferred to a holding furnace, only the middle and upper layers of the aluminum liquid are transferred, and the lower layer of the aluminum liquid is not used. Intermediate alloy is added into the first aluminum liquid in the holding furnace, and stirring is performed for 40min to obtain the second aluminum liquid; wherein the temperature of the holding furnace is 740 DEG C, and the intermediate alloy is AlFe20, AlZr10, AlY10 and AlEr10, which are added at 2kg / t, 30kg / t, 143kg / t and 81kg / t respectively;

[0056] (3) after the second aluminum liquid is detected to be qualified, second-time refining is performed by blowing argon, dross is removed after standing, and the third aluminum liquid is obtained after 30min of standing again; wherein the second-time refining temperature is 740 DEG C, and the standing time is 10min;

[0057] (4) the third aluminum liquid in the holding furnace is poured into a flow tank, and the aluminum liquid is degassed and filtered through a degassing tank and a filtering tank to obtain the fourth aluminum liquid;

[0058] (5) After the fourth molten aluminum is obtained, continuous casting is performed, wherein the casting temperature is 700℃, the casting speed is 6.5-7.5t / h, the cooling water temperature is 20℃, and the ejection temperature is 500℃;

[0059] (6) The continuous billet obtained in step (5) is rolled to obtain an aluminum rod, wherein the aluminum rod specification is a nominal diameter of 15mm, the rolling temperature is 480℃, the final rolling temperature is 150℃, and the rod collection temperature is 90℃;

[0060] (7) After the aluminum rod obtained in step (6) is cooled to room temperature, heat treatment is performed, the temperature is raised to 420℃ within 3h, and the temperature is maintained for 30h, and then the temperature is cooled to room temperature in the furnace after the temperature maintaining is completed;

[0061] (8) The aluminum rod after heat treatment in step (7) is extruded to obtain an aluminum wire with a nominal diameter of 7.0mm; wherein the extrusion die cavity temperature is 510℃;

[0062] (9) The aluminum wire obtained in step (8) is cold drawn, and the deformation amount is 25% each time, and after 8 passes of drawing to 2.8mm, a high-conductivity super-heat-resistant aluminum alloy material is obtained.

[0063] Example 3

[0064] The embodiment provides a preparation method of a high-conductivity super-heat-resistant aluminum alloy material, and the specific components of the aluminum alloy material are as follows:

[0065] Si: ≤0.05wt%, Fe: 0.18wt%, Zr: 0.4wt%, Y: 1.5wt%, Er: 1.0wt%, the sum of Cr, Mn, V and Ti is less than 0.003wt%, and the rest is Al and unavoidable impurities.

[0066] (1) An aluminum ingot with a purity of not less than 99.85% is added to a smelting furnace for heating and melting, and is maintained at 800℃, 4kg of AlB8 alloy particles per ton of aluminum water is added to the smelting furnace for boronization, a granular refining agent is used, and primary refining is performed by blowing nitrogen, the surface scum of the molten aluminum is removed after standing for 20min, and the first molten aluminum is obtained after standing for 40min;

[0067] (2) The first molten aluminum obtained in step (1) is transferred to a holding furnace, only the middle and upper layers of the molten aluminum are transferred, and the lower layer of the molten aluminum is not used. The intermediate alloy is added to the first molten aluminum in the holding furnace, and stirred for 50min to obtain the second molten aluminum; wherein the holding furnace temperature is 780℃, the intermediate alloy is AlFe20, AlZr10, AlY10 and AlEr10, and is added at 2kg / t, 30kg / t, 143kg / t and 81kg / t, respectively;

[0068] (3) After the second molten aluminum component is qualified, the second refining is performed using argon blowing sodium-removing refining agent, and after standing, slagging is performed, and the third molten aluminum is obtained after standing for 40 min; wherein the second refining temperature is 780℃, and the standing time is 20 min;

[0069] (4) The third molten aluminum in the holding furnace is poured into a flow channel, and the molten aluminum is degassed and filtered through a degassing tank and a filtering tank to obtain the fourth molten aluminum;

[0070] (5) After the fourth molten aluminum is obtained, continuous casting is performed, wherein the casting temperature is 715℃, the casting speed is 7.5 t / h, the cooling water temperature is 40℃, and the ejection temperature is 540℃;

[0071] (6) The continuous billet obtained in step (5) is rolled to obtain an aluminum rod, wherein the aluminum rod specification is a nominal diameter of 15 mm, the rolling temperature is 520℃, the final rolling temperature is 250℃, and the rod collection temperature is 120℃;

[0072] (7) The aluminum rod obtained in step (6) is cooled to room temperature and then heat treated, and the temperature is raised to 460℃ within 4 h, and the temperature is maintained for 40 h, and after the temperature maintaining is completed, the temperature is cooled to room temperature in the furnace;

[0073] (8) The aluminum rod after heat treatment in step (7) is extruded to obtain an aluminum wire with a nominal diameter of 7.0 mm; wherein the extrusion die cavity temperature is 530℃;

[0074] (9) The aluminum wire obtained in step (8) is cold drawn, and the deformation amount is 25% each time, and after 8 passes of drawing to 2.8 mm, a high-conductivity super-heat-resistant aluminum alloy material is obtained.

[0075] Comparative Example 1

[0076] The method steps are the same as those in Example 1, except that the high-conductivity super-heat-resistant aluminum alloy material does not contain Er element.

[0077] Comparative Example 2

[0078] The method steps are the same as those in Example 1, except that the high-conductivity super-heat-resistant aluminum alloy material does not contain Y element.

[0079] Comparative Example 3

[0080] The method steps are the same as those in Example 1, except that the high-conductivity super-heat-resistant aluminum alloy material does not contain Fe element.

[0081] Comparative Example 4

[0082] The method steps are the same as those in Example 1, except that the high-conductivity super-heat-resistant aluminum alloy material does not contain Zr element.

[0083] Comparative Example 5

[0084] The method steps are the same as in Example 1, except that the high-conductivity super-heat-resistant aluminum alloy material does not contain Er and Y elements.

[0085] Comparative Example 6

[0086] The method steps are the same as in Example 1, except that the high-conductivity super-heat-resistant aluminum alloy material does not contain Er and Y elements.

[0087] Comparative Example 7

[0088] The method steps are the same as in Example 1, except that the high-conductivity super-heat-resistant aluminum alloy material does not contain the high-temperature annealing (i.e., the heat treatment of step (7)) step.

[0089] Comparative Example 8

[0090] The method steps are the same as in Example 1, except that the high-conductivity super-heat-resistant aluminum alloy material does not contain the extrusion step.

[0091] Comparative Example 9

[0092] The method steps are the same as in Example 1, except that steps (7) and (8) are interchanged in the preparation process of the high-conductivity super-heat-resistant aluminum alloy material.

[0093] Effect Evaluation 1

[0094] Table 1 Product prepared in Example 1

[0095]

[0096] Table 2 Performance characterization of each comparative example

[0097]

[0098] Using granular refining agents and sodium-removing refining agents for step-by-step refining, non-metallic oxides and alkali metals, sodium elements are efficiently removed, avoiding the formation of organizational defects and affecting performance.

[0099] Aluminum boron alloy is added in granular form to improve boronization effect and ensure the purity of aluminum melt.

[0100] Zr, Y, and Er are mixed and added to improve the high-temperature mechanical properties of the material, and the 420-460℃, 30-40h heat treatment process is used to analyze and release Zr elements and improve the electrical conductivity.

[0101] Through extrusion adjustment of grain distribution, the adverse effects of direct wire drawing on resistivity are reduced.

[0102] Obviously, the above embodiments are merely example for clearly illustrating, and are not limitation to the embodiments. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments are not required to be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A method for preparing a high-conductivity, ultra-heat-resistant aluminum alloy material, characterized in that, Includes the following steps: S1: Melt aluminum ingots with a purity of not less than 99.85%, add AlB8 at 780-800℃ for boronizing, and then refine once to obtain the first aluminum liquid; the mass ratio of AlB8 to aluminum alloy is 2-4:1000; S2: After discarding the lower layer of the first aluminum liquid, add an intermediate alloy at 740-780℃ and mix to obtain the second aluminum liquid; the intermediate alloy is AlFe20, AlZr10, AlY10, or AlEr10. S3: The second aluminum liquid is refined at 740-780℃ to obtain the third aluminum liquid; S4: Degas and filter the third aluminum liquid to obtain the fourth aluminum liquid; S5: The fourth aluminum liquid is continuously cast and rolled at 700-715℃ to obtain an aluminum rod; S6: After cooling the aluminum rod to room temperature, it is heat-treated, extruded at 510-530℃, and cold-drawn to obtain the high conductivity ultra-heat resistant aluminum alloy material; the nominal diameter of the high conductivity ultra-heat resistant aluminum alloy material is 2.7-2.9mm; The high conductivity and ultra-heat resistant aluminum alloy material, by weight fraction, consists of the following components: Si: ≤0.05wt%, Fe: 0.08-0.18wt%, Zr: 0.2-0.4wt%, Y: 1.0-1.5wt%, Er: 0.5-1.0wt%; the sum of Cr, Mn, V, and Ti is less than 0.003wt%, and the remainder is Al and unavoidable impurities; The heat treatment method is as follows: the aluminum rod is heated to 420-460℃ within 3-4 hours and then held at that temperature for 30-40 hours, and then cooled to room temperature in the furnace.

2. The preparation method according to claim 1, characterized in that, In step S1, the refining method is as follows: nitrogen gas is blown into the granular refining agent for refining, and after standing for 10-20 minutes, the surface slag of the aluminum liquid is removed, and then it is left to stand for 20-40 minutes.

3. The preparation method according to claim 1, characterized in that, In step S2, the mixing method is to stir for 40-50 minutes.

4. The preparation method according to claim 1, characterized in that, In step S3, argon gas is blown into the sodium removal refining agent for secondary refining. After standing for 10-20 minutes, slag is removed, and the mixture is left to stand for another 30-40 minutes to obtain the third aluminum liquid.

5. The preparation method according to claim 1, characterized in that, In step S5, during continuous casting, the casting speed is 6.5-7.5 t / h, the cooling water temperature is 20-40℃, and the billet exit temperature is 500-540℃.

6. The preparation method according to claim 1, characterized in that, In step S5, the rolling conditions are as follows: the infeed temperature is 480-520℃, the final rolling temperature is 150-250℃, and the roll-out temperature is 90-120℃.

7. The preparation method according to claim 1, characterized in that, In step S5, the nominal diameter of the aluminum rod is 14-16mm.

8. The preparation method according to claim 1, characterized in that, In step S6, the nominal diameter of the extruded aluminum rod is 6-8 mm.

9. The preparation method according to claim 1, characterized in that, In step S6, the deformation amount during each cold drawing is 24-26%, and the number of cold drawing passes is 7-9.

10. A high-conductivity, ultra-heat-resistant aluminum alloy material prepared by the preparation method according to any one of claims 1-9.

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