A kind of high thermal conductivity and high ductility aluminum alloy material and preparation method thereof

Abstract

The invention relates to a high thermal conductivity and high ductility aluminum alloy material and a preparation method thereof, belonging to the technical field of aluminum alloy materials. The aluminum alloy material comprises the following components by mass percentage: Si: 8.50-10.50wt%; Cu: 0.02-0.05wt%; Mn: 0.35-0.60wt%; Mg: 0.01-0.06wt%; Ti: 0.05-0.15wt%; Sr: 0.015-0.025wt%; B: 0.03-0.1wt%; Y: 0.5-1.0wt%; the balance is Al; the content of inevitable impurities is less than 0.05wt%. The invention adds aluminum-copper alloy and aluminum-magnesium alloy, and refines the grain structure of the system with aluminum-titanium alloy, strengthens the grain boundary in the system with aluminum-titanium-boron rod, and enhances the ductility of the finished product; in addition, yttrium, strontium and boron are used for composite modification to synergistically increase the thermal conductivity of the finished product.

Description

Technical Field

[0001] The present invention belongs to the technical field of aluminum alloy materials, and in particular, relates to a high thermal conductivity and high ductility aluminum alloy material and a preparation method thereof. Background Art

[0002] Aluminum is a light metal with high strength-to-weight ratio, low melting point, good thermal and electrical conductivity. Compared with other metals, aluminum has a relatively low density, so it is relatively light and suitable for manufacturing various industrial products. The characteristics of aluminum alloys include good thermal conductivity and ductility, that is, it can quickly transfer heat and is easy to stretch and form, and its shape can be changed at will during the manufacturing process. Because of the above advantages, aluminum alloys have important application value in the industrial field and can be widely used in electronic equipment, automobile manufacturing, aerospace and other fields.

[0003] There are many manufacturers developing high-performance aluminum alloy materials on the market, but the ductility and thermal conductivity of the developed aluminum alloy materials are relatively poor, which limits the use of the products made and makes it difficult to play a greater role. Therefore, providing a high thermal conductivity and high ductility aluminum alloy material can not only meet industrial needs, but also promote the development of the alloy material field. Summary of the invention

[0004] The purpose of the present invention is to provide a high thermal conductivity and high ductility aluminum alloy material and a preparation method thereof, so as to solve the problem that the aluminum alloy material in the prior art has poor ductility and thermal conductivity.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A high thermal conductivity and high ductility aluminum alloy material, the aluminum alloy material comprises the following components by mass percentage:

[0007] Si: 8.50-10.50wt%; Cu: 0.02-0.05wt%; Mn: 0.35-0.60wt%; Mg: 0.01-0.06wt%; Ti: 0.05-0.15wt%; Sr: 0.015-0.025wt%; B: 0.03-0.1wt%; Y: 0.5-1.0wt%; the balance is Al; the content of inevitable impurities is less than 0.05wt%.

[0008] A method for preparing a high thermal conductivity and high ductility aluminum alloy material, the preparation method comprising the following steps:

[0009] S1. According to the composition and proportion of the above-mentioned high thermal conductivity and high ductility aluminum alloy material, industrial aluminum ingots, aluminum-silicon alloys, aluminum-copper alloys, aluminum-manganese alloys, magnesium ingots, aluminum-titanium alloys, aluminum-strontium alloys, aluminum-boron alloys, aluminum-yttrium alloys and aluminum-titanium-boron rods are weighed and polished to remove oxide layers, dried and preheated respectively;

[0010] S2, temperature control: melt the preheated industrial aluminum ingot, add aluminum-silicon alloy, aluminum-copper alloy, aluminum-manganese alloy, aluminum-titanium alloy and aluminum-titanium-boron rod, and then add magnesium ingot, melt, and obtain melt A, stir the melt A evenly and let it stand to keep the temperature, control the temperature and add aluminum-strontium alloy, aluminum-boron alloy and aluminum-yttrium alloy to melt, obtain melt B, stir the melt B evenly and let it stand to keep the temperature, and obtain melt C;

[0011] S3. Add refining agent and slag removal agent to melt C, mix them, and add them into melt C by nitrogen blowing method to control temperature, refine and remove slag, let it stand, remove the slag, take it out of the furnace for casting and naturally cool it to obtain a finished product of high thermal conductivity and high ductility aluminum alloy material.

[0012] As a preferred technical solution of the present invention, the industrial aluminum ingot in step S1 has a purity of 99.95wt.%, the purity of aluminum-silicon alloy is Al-20wt.%Si, the purity of aluminum-copper alloy is Al-50wt.%Cu, the purity of aluminum-manganese alloy is Al-10wt.%Mn, the purity of magnesium ingot is 99.95wt.%, the purity of aluminum-titanium alloy is Al-10wt.%Ti, the purity of aluminum-strontium alloy is Al-10wt.%Sr, the purity of aluminum-boron alloy is Al-3wt.%B, the purity of aluminum-yttrium alloy is Al-10wt.%Y, and the aluminum-titanium-boron rod is purchased from Shanghai Youfeng Alloy Materials Co., Ltd. with the brand name ALTi5B1.

[0013] As a preferred technical solution of the present invention, the preheating in step S1 is preheating to 180-200°C.

[0014] As a preferred technical solution of the present invention, the aluminum-silicon alloy is added in step S2 when the aluminum ingot is partially melted; the aluminum-copper alloy is added when the aluminum-silicon alloy begins to melt; the aluminum-manganese alloy, aluminum-titanium alloy and aluminum-titanium-boron rod are added when the aluminum-copper alloy begins to melt; the magnesium ingot is added when the aluminum-manganese alloy, aluminum-titanium alloy and aluminum-titanium-boron rod are all melted, high-purity argon gas is introduced for protection, the magnesium ingot is added under temperature control, and it is slowly stirred for melting.

[0015] Furthermore, the temperature control of melting the preheated industrial aluminum ingot in step S2 is specifically as follows: the preheated industrial aluminum ingot is added into the graphite crucible at a temperature of 710-730°C for melting; the temperature of adding the magnesium ingot is controlled to be 680-690°C; the melt A is stirred evenly and kept warm for 10-15 minutes; the temperature of adding the aluminum-strontium alloy, aluminum-boron alloy and aluminum-yttrium alloy for melting is controlled to be 710-720°C; the melt B is stirred evenly and kept warm for 10-15 minutes.

[0016] Furthermore, the magnesium ingot is a magnesium ingot wrapped in aluminum foil.

[0017] As a preferred technical solution of the present invention, the refining agent grade in step S3 is YT-J-1, and the slag remover grade is YT-D-4; the mass ratio of the refining agent to the slag remover is 2-3:1.

[0018] Furthermore, the total amount of the refining agent and the slag removal agent added in step S3 is 0.8-1% of the mass of the melt C.

[0019] As a preferred technical solution of the present invention, the temperature of the temperature-controlled refining and slag removal in step S3 is 700-710°C; and the standing time is 5-6 minutes.

[0020] Beneficial effects of the present invention:

[0021] (1) The present invention adds aluminum-copper alloy and aluminum-magnesium alloy with excellent ductility and plasticity, and uses aluminum-titanium alloy as an external crystal nucleus to refine the grain structure of the system, and uses aluminum-titanium-boron rods to strengthen the grain boundaries in the system, thereby enhancing the ductility of the final product.

[0022] (2) The present invention uses yttrium, strontium and boron elements to perform composite modification to synergistically increase the thermal conductivity of the finished product. Specifically, yttrium promotes the precipitation of impurity components dissolved in the aluminum matrix to reduce the solid solubility of the elements in the aluminum matrix; boron combines with the precipitated impurity elements to change the impurity elements from a solid solution state to a precipitated state, purifies the melt, and eliminates the influence of the impurity elements on the thermal conductivity of the finished product; strontium improves the distribution morphology of the eutectic silicon phase in the system and increases the contact area between the eutectic silicon structure and aluminum. That is, the three elements synergistically increase the thermal conductivity of the finished product from different aspects. DETAILED DESCRIPTION

[0023] The following will be combined with the 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.

[0024] The purity of the industrial aluminum ingots used in the present invention is 99.95wt.%, the purity of the aluminum-silicon alloy is Al-20wt.%Si, the purity of the aluminum-copper alloy is Al-50wt.%Cu, the purity of the aluminum-manganese alloy is Al-10wt.%Mn, the purity of the magnesium ingot is 99.95wt.%, the purity of the aluminum-titanium alloy is Al-10wt.%Ti, the purity of the aluminum-strontium alloy is Al-10wt.%Sr, the purity of the aluminum-boron alloy is Al-3wt.%B, the purity of the aluminum-yttrium alloy is Al-10wt.%Y, and the aluminum-titanium-boron rod is purchased from Shanghai Youfeng Alloy Materials Co., Ltd. with the brand ALTi5B1, which will not be described later.

[0025] Example 1

[0026] A high thermal conductivity and high ductility aluminum alloy material, the aluminum alloy material comprises the following components by mass percentage:

[0027] Si: 9.50wt%; Cu: 0.02wt%; Mn: 0.35wt%; Mg: 0.04wt%; Ti: 0.05wt%; Sr: 0.015wt%; B: 0.03wt%; Y: 0.7wt%; the balance is Al; the content of inevitable impurities is less than 0.05wt%.

[0028] A method for preparing a high thermal conductivity and high ductility aluminum alloy material, the preparation method comprising the following steps:

[0029] S1. According to the composition and proportion of the above-mentioned high thermal conductivity and high ductility aluminum alloy material, industrial aluminum ingots, aluminum-silicon alloys, aluminum-copper alloys, aluminum-manganese alloys, magnesium ingots, aluminum-titanium alloys, aluminum-strontium alloys, aluminum-boron alloys, aluminum-yttrium alloys and aluminum-titanium-boron rods are weighed and polished to remove the oxide layer, dried and preheated to 190° C.

[0030] S2, add the preheated industrial aluminum ingot to the graphite crucible at a temperature of 710°C to melt it, add aluminum-silicon alloy when the aluminum ingot is partially melted, add aluminum-copper alloy when the aluminum-silicon alloy begins to melt, add aluminum-manganese alloy, aluminum-titanium alloy and aluminum-titanium-boron rod when the aluminum-copper alloy begins to melt, and introduce high-purity argon gas protection when the aluminum-manganese alloy, aluminum-titanium alloy and aluminum-titanium-boron rod are all melted, add magnesium ingot wrapped in aluminum foil at a temperature of 680°C, slowly stir and melt to obtain melt A, stir melt A evenly and let it stand for 15 minutes, control the temperature to 710°C, add aluminum-strontium alloy, aluminum-boron alloy and aluminum-yttrium alloy to melt to obtain melt B, stir melt B evenly and let it stand for 10 minutes to obtain melt C;

[0031] S3, add YT-J-1 refining agent and YT-D-4 slag removal agent to melt C, mix them, and add them to melt C by nitrogen blowing method, control the temperature to 705℃ for refining and slag removal, let it stand for 5 minutes, remove the slag from the furnace and cast it into shape, and cool it naturally to obtain a finished product of high thermal conductivity and high ductility aluminum alloy material;

[0032] The mass ratio of the refining agent to the deslagging agent is 3:1; the total addition amount of the YT-J-1 refining agent and the YT-D-4 deslagging agent is 0.8% of the mass of the melt C.

[0033] Example 2

[0034] A high thermal conductivity and high ductility aluminum alloy material, the aluminum alloy material comprises the following components by mass percentage:

[0035] Si: 8.50wt%; Cu: 0.05wt%; Mn: 0.60wt%; Mg: 0.06wt%; Ti: 0.15wt%; Sr: 0.025wt%; B: 0.07wt%; Y: 1.0wt%; the balance is Al; the content of inevitable impurities is less than 0.05wt%.

[0036] A method for preparing a high thermal conductivity and high ductility aluminum alloy material, the preparation method comprising the following steps:

[0037] S1. According to the composition and proportion of the above-mentioned high thermal conductivity and high ductility aluminum alloy material, industrial aluminum ingots, aluminum-silicon alloys, aluminum-copper alloys, aluminum-manganese alloys, magnesium ingots, aluminum-titanium alloys, aluminum-strontium alloys, aluminum-boron alloys, aluminum-yttrium alloys and aluminum-titanium-boron rods are weighed and polished to remove the oxide layer, dried and preheated to 180° C.

[0038] S2, add the preheated industrial aluminum ingot to the graphite crucible at 730°C for melting, add aluminum-silicon alloy when the aluminum ingot is partially melted, add aluminum-copper alloy when the aluminum-silicon alloy begins to melt, add aluminum-manganese alloy, aluminum-titanium alloy and aluminum-titanium-boron rod when the aluminum-copper alloy begins to melt, and introduce high-purity argon gas protection when the aluminum-manganese alloy, aluminum-titanium alloy and aluminum-titanium-boron rod are all melted, add magnesium ingot wrapped in aluminum foil at 685°C, slowly stir and melt to obtain melt A, stir melt A evenly and let it stand for 10 minutes, control the temperature to 715°C, add aluminum-strontium alloy, aluminum-boron alloy and aluminum-yttrium alloy to melt to obtain melt B, stir melt B evenly and let it stand for 15 minutes to obtain melt C;

[0039] S3, add YT-J-1 refining agent and YT-D-4 slag removal agent to melt C, mix them, and add them to melt C by nitrogen blowing method, control the temperature to 710℃ for refining and slag removal, let it stand for 6 minutes, remove the slag from the furnace and cast it into shape, and cool it naturally to obtain a finished product of high thermal conductivity and high ductility aluminum alloy material;

[0040] The mass ratio of the refining agent to the deslagging agent is 2:1; the total addition amount of the YT-J-1 refining agent and the YT-D-4 deslagging agent is 0.9% of the mass of the melt C.

[0041] Example 3

[0042] A high thermal conductivity and high ductility aluminum alloy material, the aluminum alloy material comprises the following components by mass percentage:

[0043] Si: 10.50wt%; Cu: 0.04wt%; Mn: 0.50wt%; Mg: 0.01wt%; Ti: 0.10wt%; Sr: 0.020wt%; B: 0.1wt%; Y: 0.5wt%; the balance is Al; the content of inevitable impurities is less than 0.05wt%.

[0044] A method for preparing a high thermal conductivity and high ductility aluminum alloy material, the preparation method comprising the following steps:

[0045] S1. According to the composition and proportion of the above-mentioned high thermal conductivity and high ductility aluminum alloy material, industrial aluminum ingots, aluminum-silicon alloys, aluminum-copper alloys, aluminum-manganese alloys, magnesium ingots, aluminum-titanium alloys, aluminum-strontium alloys, aluminum-boron alloys, aluminum-yttrium alloys and aluminum-titanium-boron rods are weighed and polished to remove oxide layers, dried and preheated to 200° C.

[0046] S2, add the preheated industrial aluminum ingot to the graphite crucible at a temperature of 720°C to melt it, add aluminum-silicon alloy when the aluminum ingot is partially melted, add aluminum-copper alloy when the aluminum-silicon alloy begins to melt, add aluminum-manganese alloy, aluminum-titanium alloy and aluminum-titanium-boron rod when the aluminum-copper alloy begins to melt, and introduce high-purity argon gas protection when the aluminum-manganese alloy, aluminum-titanium alloy and aluminum-titanium-boron rod are all melted, add magnesium ingot wrapped in aluminum foil at a temperature of 690°C, slowly stir and melt to obtain melt A, stir melt A evenly and let it stand for 13 minutes, control the temperature at 720°C, add aluminum-strontium alloy, aluminum-boron alloy and aluminum-yttrium alloy to melt to obtain melt B, stir melt B evenly and let it stand for 13 minutes to obtain melt C;

[0047] S3, add YT-J-1 refining agent and YT-D-4 slag removal agent to melt C, mix them, and add them to melt C by nitrogen blowing method, control the temperature at 700℃ for refining and slag removal, let it stand for 6 minutes, remove the slag from the furnace and cast it into shape, and cool it naturally to obtain a finished product of high thermal conductivity and high ductility aluminum alloy material;

[0048] The mass ratio of the refining agent to the deslagging agent is 2.5:1; the total addition amount of the YT-J-1 refining agent and the YT-D-4 deslagging agent is 1% of the mass of the melt C.

[0049] Comparative Example 1

[0050] Compared with Example 2, the difference is that no aluminum-copper alloy is added in Comparative Example 1, and a high thermal conductivity and high ductility aluminum alloy material includes the following components by mass percentage:

[0051] Si: 8.50wt%; Mn: 0.60wt%; Mg: 0.06; Ti: 0.15wt%; Sr: 0.025wt%; B: 0.07wt%; Y: 1.0wt%; the balance is Al; the inevitable impurity content is less than 0.05wt%;

[0052] The preparation steps are the same as in Example 2.

[0053] Comparative Example 2

[0054] Compared with Example 2, the difference is that no aluminum-magnesium alloy is added in Comparative Example 2, and a high thermal conductivity and high ductility aluminum alloy material includes the following components by mass percentage:

[0055] Si: 8.50wt%; Cu: 0.05wt%; Mn: 0.60wt%; Ti: 0.15wt%; Sr: 0.025wt%; B: 0.07wt%; Y: 1.0wt%; the balance is Al; the inevitable impurity content is less than 0.05wt%;

[0056] The preparation steps are the same as in Example 2.

[0057] Comparative Example 3

[0058] Compared with Example 2, the difference is that in Comparative Example 3, no aluminum-titanium alloy is added, and a high thermal conductivity and high ductility aluminum alloy material includes the following components by mass percentage:

[0059] Si: 8.50wt%; Cu: 0.05wt%; Mn: 0.60wt%; Mg: 0.06wt%; Ti: 0.15wt%; Sr: 0.025wt%; B: 0.07wt%; Y: 1.0wt%; the balance is Al; the inevitable impurity content is less than 0.05wt%;

[0060] The preparation steps are the same as in Example 2.

[0061] Comparative Example 4

[0062] Compared with Example 2, the difference is that in Comparative Example 4, no aluminum-titanium-boron rod is added, and a high thermal conductivity and high ductility aluminum alloy material includes the following components by mass percentage:

[0063] Si: 8.50wt%; Cu: 0.05wt%; Mn: 0.60wt%; Mg: 0.06wt%; Ti: 0.15wt%; Sr: 0.025wt%; B: 0.07wt%; Y: 1.0wt%; the balance is Al; the inevitable impurity content is less than 0.05wt%;

[0064] The preparation steps are the same as in Example 2.

[0065] Comparative Example 5

[0066] Compared with Example 2, the difference is that in Comparative Example 5, no aluminum-yttrium alloy is added, and a high thermal conductivity and high ductility aluminum alloy material includes the following components by mass percentage:

[0067] Si: 8.50wt%; Cu: 0.05wt%; Mn: 0.60wt%; Mg: 0.06wt%; Ti: 0.15wt%; Sr: 0.025wt%; B: 0.07wt%; the balance is Al; the inevitable impurity content is less than 0.05wt%;

[0068] The preparation steps are the same as in Example 2.

[0069] Comparative Example 6

[0070] Compared with Example 2, the difference is that in Comparative Example 6, no aluminum-strontium alloy is added, and a high thermal conductivity and high ductility aluminum alloy material includes the following components by mass percentage:

[0071] Si: 8.50wt%; Cu: 0.05wt%; Mn: 0.60wt%; Mg: 0.06wt%; Ti: 0.15wt%; B: 0.07wt%; Y: 1.0wt%; the balance is Al; the inevitable impurity content is less than 0.05wt%;

[0072] The preparation steps are the same as in Example 2.

[0073] Comparative Example 7

[0074] Compared with Example 2, the difference is that in Comparative Example 7, no aluminum-boron alloy is added, and a high thermal conductivity and high ductility aluminum alloy material includes the following components by mass percentage:

[0075] Si: 8.50wt%; Cu: 0.05wt%; Mn: 0.60wt%; Mg: 0.06wt%; Ti: 0.15wt%; Sr: 0.025wt%; B: 0.07wt%; Y: 1.0wt%; the balance is Al; the inevitable impurity content is less than 0.05wt%;

[0076] The preparation steps are the same as in Example 2.

[0077] Test Case

[0078] (1) According to GB / T228.1-2021, the elongation test was performed on the finished products of high thermal conductivity and high ductility aluminum alloy materials prepared in Examples 1-3 and Comparative Examples 1-4. The results are shown in Table 1.

[0079] (2) According to GB / T 22588-2008, the thermal conductivity of the finished products of high thermal conductivity and high ductility aluminum alloy materials prepared in Examples 1-3 and Comparative Examples 5-7 was tested. The results are shown in Table 1.

[0080] Table 1

[0081] Thermal conductivity / (W / (m*K)) Elongation(%) Example 1 167.4 12.9 Example 2 168.3 13.7 Example 3 166.9 12.1 Comparative Example 1 —— 8.5 Comparative Example 2 —— 9.3 Comparative Example 3 —— 10.6 Comparative Example 4 —— 10.0 Comparative Example 5 120.0 —— Comparative Example 6 128.4 —— Comparative Example 7 114.6 ——

[0082] It can be seen from Table 1 that the high thermal conductivity and high ductility aluminum alloy material product prepared by the present invention has excellent ductility and thermal conductivity. Specifically, it can be seen from Examples 1-3 and Comparative Examples 1-4 that whether the copper element or the magnesium element is missing, and whether the aluminum-titanium alloy or the aluminum-titanium-boron rod is not added, the ductility of the finished product will eventually be affected. And it can be seen from Examples 1-3 and Comparative Examples 5-7 that the aluminum-yttrium alloy, aluminum-strontium alloy and aluminum-boron alloy added by the present invention can synergistically increase the thermal conductivity of the finished product.

[0083] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0084] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A high thermal conductivity and high ductility aluminum alloy material, characterized in that: The aluminum alloy material comprises the following components by mass percentage: Si: 8.50-10.50wt%; Cu: 0.02-0.05wt%; Mn: 0.35-0.60wt%; Mg: 0.01-0.06wt%; Ti : 0.05-0.15wt%; Sr :0.015-0.025wt%; B: 0.03-0.1wt%; Y: 0.5-1.0wt%; the balance is Al; the content of inevitable impurities is less than 0.05wt%; The method for preparing the high thermal conductivity and high ductility aluminum alloy material adopts the composition and proportion of the high thermal conductivity and high ductility aluminum alloy material, and the method comprises the following steps: S1. Weigh industrial aluminum ingots, aluminum-silicon alloys, aluminum-copper alloys, aluminum-manganese alloys, magnesium ingots, aluminum-titanium alloys, aluminum-strontium alloys, aluminum-boron alloys, aluminum-yttrium alloys and aluminum-titanium-boron rods, grind them to remove oxide layers, dry them, and preheat them; The purity of the industrial aluminum ingot in step S1 is 99.95wt.%, the purity of the aluminum-silicon alloy is Al-20wt.%Si, the purity of the aluminum-copper alloy is Al-50wt.%Cu, the purity of the aluminum-manganese alloy is Al-10wt.%Mn, the purity of the magnesium ingot is 99.95wt.%, the purity of the aluminum-titanium alloy is Al-10wt.%Ti, the purity of the aluminum-strontium alloy is Al-10wt.%Sr, the purity of the aluminum-boron alloy is Al-3wt.%B, and the purity of the aluminum-yttrium alloy is Al-10wt.%Y; S2, temperature control: melt the preheated industrial aluminum ingot, add aluminum-silicon alloy, aluminum-copper alloy, aluminum-manganese alloy, aluminum-titanium alloy and aluminum-titanium-boron rod, and then add magnesium ingot, melt, and obtain melt A, stir the melt A evenly and let it stand to keep the temperature, control the temperature and add aluminum-strontium alloy, aluminum-boron alloy and aluminum-yttrium alloy to melt, obtain melt B, stir the melt B evenly and let it stand to keep the temperature, and obtain melt C; The aluminum-silicon alloy is added when the aluminum ingot is partially melted; the aluminum-copper alloy is added when the aluminum-silicon alloy begins to melt; the aluminum-manganese alloy, aluminum-titanium alloy and aluminum-titanium-boron rod are added when the aluminum-copper alloy begins to melt; the magnesium ingot is added when the aluminum-manganese alloy, aluminum-titanium alloy and aluminum-titanium-boron rod are all melted, high-purity argon gas is introduced for protection, the magnesium ingot is added under temperature control, and slowly stirred to melt; S3. Add refining agent and slag removal agent to melt C, mix them, and add them into melt C by nitrogen blowing method to control temperature, refine and remove slag, let it stand, remove the slag, take it out of the furnace for casting and naturally cool it to obtain a finished product of high thermal conductivity and high ductility aluminum alloy material.

2. The high thermal conductivity and high ductility aluminum alloy material according to claim 1, characterized in that: The preheating in step S1 is preheating to 180-200°C.

3. The high thermal conductivity and high ductility aluminum alloy material according to claim 1, characterized in that: The temperature control of step S2 to melt the preheated industrial aluminum ingot is specifically as follows: the preheated industrial aluminum ingot is added to the graphite crucible at a temperature of 710-730°C for melting; the temperature of the magnesium ingot is controlled to be 680-690°C; the melt A is stirred evenly and kept warm for 10-15min; the temperature of the aluminum-strontium alloy, aluminum-boron alloy and aluminum-yttrium alloy is added at a temperature of 710-720°C for melting; the melt B is stirred evenly and kept warm for 10-15min.

4. The high thermal conductivity and high ductility aluminum alloy material according to claim 1, characterized in that: The magnesium ingot is a magnesium ingot wrapped in aluminum foil.

5. The high thermal conductivity and high ductility aluminum alloy material according to claim 1, characterized in that: The mass ratio of the refining agent to the deslagging agent in step S3 is 2-3:

1.

6. The high thermal conductivity and high ductility aluminum alloy material according to claim 1, characterized in that: The total amount of the refining agent and the slag removal agent added in step S3 is 0.8-1% of the mass of the melt C.

7. The high thermal conductivity and high ductility aluminum alloy material according to claim 1, characterized in that: The temperature of the temperature-controlled refining and slag removal in step S3 is 700-710°C; the standing time is 5-6 minutes.