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CN-122012999-A - High-heat-conductivity high-compactness aluminum alloy material, preparation method and application thereof

CN122012999ACN 122012999 ACN122012999 ACN 122012999ACN-122012999-A

Abstract

The invention discloses a high-heat-conductivity high-compactness aluminum alloy material, a preparation method and application thereof, wherein the high-heat-conductivity high-compactness aluminum alloy material comprises the following chemical components in percentage by mass, and the specific composition comprises ：Si：0.3～0.6%,Mg：0.5～0.8%,Fe：≤ 0.08%,Cu：≤ 0.08%,Mn：≤ 0.005%,Cr：0.001～0.02%,Zn：≤ 0.008%,Ti：≤ 0.008%,La：0.001～0.03%, of Al and unavoidable impurities. According to the invention, the purity of components is ensured by smelting, casting and homogenizing treatment, the grain refinement and tissue densification are realized by combining large deformation cold forging and forming, and then the strengthening phase is finely and uniformly separated out by the cooperation of solid solution and two-stage aging, so that the high-heat-conductivity high-compactness aluminum alloy material with the tensile strength of more than or equal to 200 MPa, the heat conductivity coefficient of more than or equal to 200W/(m.K) and excellent surface compactness is finally prepared.

Inventors

  • WU JIAWEI
  • DUAN ZHICHAO
  • WU JIN

Assignees

  • 深圳智圣热管理科技有限公司

Dates

Publication Date
20260512
Application Date
20260401

Claims (10)

  1. 1. The high-heat-conductivity high-compactness aluminum alloy material is characterized by comprising the following chemical components in percentage by mass: Si:0.3~0.6%, Mg:0.5~0.8%, Fe:≤ 0.08%, Cu:≤ 0.08%, Mn:≤ 0.005%, Cr:0.001~0.02%, Zn:≤ 0.008%, Ti:≤ 0.008%, La:0.001~0.03%, The balance being Al and unavoidable impurities.
  2. 2. The high heat conductivity and high density aluminum alloy material as claimed in claim 1, wherein the Fe content is not more than 0.05%, and the unavoidable impurities are individually contained in an amount of not more than 0.008% and the total content is not more than 0.01%.
  3. 3. A method for preparing a high-heat-conductivity high-compactness aluminum alloy material, which is used for preparing the high-heat-conductivity high-compactness aluminum alloy material as claimed in claim 1 or 2, and is characterized in that the method for preparing the high-heat-conductivity high-compactness aluminum alloy material comprises the following steps: smelting and casting, namely accurately blending according to the chemical components of the high-heat-conductivity high-compactness aluminum alloy material, smelting and refining the blended raw materials, and casting to form an alloy cast ingot; Homogenizing treatment, namely homogenizing heat treatment is carried out on the alloy ingot so as to eliminate component segregation in the alloy ingot; Cold forging and forming, namely placing the blank subjected to homogenization treatment in a room temperature environment for cold forging and plastic deformation, wherein the forging ratio is not less than 3:1, and lubricant is required to be applied in the deformation process so as to reduce deformation resistance; Solution treatment, namely heating a workpiece subjected to cold forging and pressing to a solution temperature for heat preservation treatment, and then quenching; aging treatment, namely performing two-stage aging treatment on the workpiece subjected to solution quenching to precipitate a strengthening phase.
  4. 4. The method for producing a high heat conduction and high density aluminum alloy material according to claim 3, wherein said subjecting the work piece after solution hardening to two-stage aging treatment to precipitate a strengthening phase comprises; The first-stage aging is to keep the temperature for 2 hours in the environment of 120 ℃ plus or minus 3 ℃; after the first-stage aging is completed, performing second-stage aging; preserving heat for 6 hours under the environment of 175 ℃ plus or minus 3 ℃ so as to improve the mechanical and heat conducting properties of the material.
  5. 5. The method for preparing a high heat conductivity and high density aluminum alloy material according to claim 3, wherein the cold forging plastic deformation is performed in a room temperature environment, wherein the forging ratio is not less than 3:1, and the preheating process is performed before a lubricant is applied to reduce the deformation resistance during the deformation process, and the preheating process comprises: Placing the blank in an environment with 415 ℃ plus or minus 5 ℃ for 2 to 3 hours; furnace cooling at a rate of no more than 30 ℃ per hour; discharging after the temperature of the blank is reduced to below 260 ℃, and carrying out cold forging operation.
  6. 6. The method for producing a high heat conductive and high density aluminum alloy material according to claim 3, wherein the cold forging plastic deformation is performed in a room temperature environment of the homogenized billet, wherein the forging ratio is not less than 3:1, and a lubricant is applied during the deformation process to reduce the deformation resistance, comprising; The lubricant used is a composite system of phosphate saponified film and high molecular lubricant.
  7. 7. The method for producing a high heat conductive and high density aluminum alloy material according to claim 3, wherein the step of heating the cold-forged workpiece to a solid solution temperature for heat preservation and then quenching comprises; the cooling rate of forced water spray quenching is not lower than 50 ℃ per second.
  8. 8. The method for producing a high heat conduction and high density aluminum alloy material according to claim 3, wherein the step of performing a two-stage aging treatment on the solution quenched workpiece to precipitate a strengthening phase comprises; The two-stage aging treatment is started within 4 hours after solution quenching is completed, so that abnormal transformation of internal tissues of the workpiece is prevented.
  9. 9. An aluminum alloy article, characterized in that the aluminum alloy article is produced by the production method according to any one of claims 3 to 8, and the aluminum alloy article has a thermal conductivity of not less than 200W/(m-K) at 25 ℃ and a tensile strength of not less than 200 MPa and an elongation after break of not less than 10%.
  10. 10. The aluminum alloy article as recited in claim 9, wherein the aluminum alloy article is a precision structural member formed by a cold forging process.

Description

High-heat-conductivity high-compactness aluminum alloy material, preparation method and application thereof Technical Field The invention relates to the technical field of metal materials, in particular to a high-heat-conductivity high-compactness aluminum alloy material, a preparation method and application thereof. Background With the rapid development of 5G communication, data centers and high-end electronic equipment, the power density of devices such as core optical modules is continuously improved, and higher requirements are put on precise structural members for bearing the devices, namely, the devices not only have enough mechanical strength and dimensional accuracy, but also have excellent thermal management capability, and can efficiently dissipate heat generated by a main body, so that the long-term reliable operation of the equipment is ensured. At present, the heat conductivity coefficient of commonly used structural aluminum alloys (such as 6063 aluminum alloy and zinc alloy) is generally lower than 180W/(m.K), and the high heat conductivity requirement of more than 200W/(m.K) is difficult to meet. Pure aluminum has a high heat conductivity coefficient, but has low strength, and the processability is difficult to meet the molding requirement of a complex precise structure. By adding the alloy element to improve the strength, more solid solution atoms and second phases are generally introduced, and remarkable scattering is generated on electrons and sound, so that the heat conduction performance is obviously reduced. In addition, the aluminum alloy part prepared by the traditional die casting or extrusion molding process is easy to generate defects such as shrinkage cavity, inclusion and the like, has insufficient surface compactness, is easy to generate problems such as pinholes, bubbles and the like in the subsequent electroplating treatment process with high requirements, and influences the appearance quality, corrosion resistance and long-term reliability of the product. Therefore, development of an aluminum alloy material having high strength (tensile strength is not less than 200 MPa), high thermal conductivity (is not less than 200W/(m.K)), excellent cold forging formability and good electroplating adaptability and a forming process thereof has become a technical problem to be solved in the art. Disclosure of Invention The application aims to provide a high-heat-conductivity high-compactness aluminum alloy material, a preparation method and application thereof, and in the scheme, the scattering of coarse intermetallic compounds and solid solution atoms on hot carriers is reduced by strictly limiting the content of harmful impurity elements such as Fe, cu, mn, zn and the like. Meanwhile, the application guarantees the purity of the components through smelting casting and homogenizing treatment, combines large deformation cold forging and pressing to realize grain refinement and tissue densification, and then cooperates with solid solution and double-stage aging to lead the strengthening phase to be finely and uniformly separated out, finally preparing the high-heat-conductivity high-compactness aluminum alloy material with the tensile strength of more than or equal to 200 MPa, the heat conductivity coefficient of more than or equal to 200W/(m.K) and excellent surface compactness. In order to solve the technical problems, the application provides a high-heat-conductivity high-compactness aluminum alloy material, which comprises the following chemical components in percentage by mass: Si:0.3~0.6%, Mg:0.5~0.8%, Fe:≤ 0.08%, Cu:≤ 0.08%, Mn:≤ 0.005%, Cr:0.001~0.02%, Zn:≤ 0.008%, Ti:≤ 0.008%, La:0.001~0.03%, The balance being Al and unavoidable impurities. Preferably, the Fe content is less than or equal to 0.05%, and the single content of the unavoidable impurities is less than or equal to 0.008%, and the total content is less than or equal to 0.01%. In order to solve the technical problems, the application provides a preparation method of a high-heat-conductivity high-compactness aluminum alloy material, which is used for preparing the high-heat-conductivity high-compactness aluminum alloy material, and comprises the following steps: smelting and casting, namely accurately blending according to the chemical components of the high-heat-conductivity high-compactness aluminum alloy material, smelting and refining the blended raw materials, and casting to form an alloy cast ingot; Homogenizing treatment, namely homogenizing heat treatment is carried out on the alloy ingot so as to eliminate component segregation in the alloy ingot; Cold forging and forming, namely placing the blank subjected to homogenization treatment in a room temperature environment for cold forging and plastic deformation, wherein the forging ratio is not less than 3:1, and lubricant is required to be applied in the deformation process so as to reduce deformation resistance; And (3) solution treatment, namely heating the workp