A kind of preparation method of high zn light weight high strength aluminum alloy

An aluminum alloy, lightweight technology, applied in the field of material processing engineering, to achieve the effects of avoiding pore defects, high energy utilization, and reducing costs

Active Publication Date: 2022-03-01
HARBIN INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the deficiencies in the existing alloy preparation technology. The present invention proposes a new method——a high-strength aluminum alloy preparation method based on selective laser melting, which adapts to the processing characteristics of selective laser melting and realizes the performance improvement of aluminum alloys. further strengthening

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  • A kind of preparation method of high zn light weight high strength aluminum alloy
  • A kind of preparation method of high zn light weight high strength aluminum alloy
  • A kind of preparation method of high zn light weight high strength aluminum alloy

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Embodiment 1

[0045] In this embodiment, Al-14Zn-2Mg-2Zr powder composition is taken as an example, and the alloy sample is tested by ball milling and selective laser melting. Adopt preparation method of the present invention as follows:

[0046] Step 1: Prepare Al powder, Zn powder, Mg powder and Zr powder respectively, the powder shapes are all spherical, the particle sizes of Al powder, Zn powder and Mg powder are all concentrated in the range of 60-80 μm, and the particle size of Zr powder is concentrated distribution In the range of 80-100μm.

[0047] Step 2: use electronic balance according to the powder ratio of above-mentioned Al-14Zn-2Mg-2Zr, the powder of different elements is weighed: promptly take by weighing 2g Zr powder, 2gMg powder and 14gZn powder and 82gAl powder, above-mentioned powder is mixed in Together.

[0048] Step 3: Use a planetary ball mill mixer to carry out mechanical mixing, feed inert gas Ar gas into the mixing tank to protect the powder from oxidation at a ...

Embodiment 7075

[0057] In this embodiment, 7075 aluminum alloy powder (Al-5.6Zn-2Mg) is taken as an example, and the aluminum alloy sample is formed by selective laser melting as follows:

[0058] Step 1: Draw the model through 3D drawing software, and draw the 3D model according to the pre-designed part structure and size.

[0059] Step 2: Set the thickness of powder coating in the test to 30 μm, and the software cuts the height of the planned forming component from the bottom plane into a plurality of continuous slices of equal thickness with a thickness of 30 μm.

[0060] Step 3: Pre-clamp the substrate on the forming platform, adjust the level of the substrate to ±0.025mm, fix the cooling cavity at the bottom of the substrate and near it, and inject 0°C cooling liquid with a flow rate of 5L / min.

[0061] Step 4: Set the process parameters. The laser spot diameter used in the scanning process is 0.1mm, the laser scanning distance is 0.1mm, the laser power is 360W, the laser scanning rate i...

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Abstract

A method for preparing a high-Zn light-weight high-strength aluminum alloy relates to the field of material processing engineering. The invention is based on a method for preparing a high-strength aluminum alloy by selective laser melting, adapts to the processing characteristics of selective laser melting, and realizes further strengthening of the performance of the aluminum alloy. The present invention designs an Al-Zn-Mg-Zr alloy powder suitable for selective laser melting technology, and proposes to control the overlap rate between adjacent melting channels at -5% to 5%, on the basis of realizing effective connection Minimize the burning loss of Zn. At the same time, different from the preheating of the substrate in the forming process of other aluminum alloys, the present invention proposes to further cool down the substrate, and increase the temperature gradient by passing cooling fluid through the bottom and side of the substrate, thereby further increasing the supersaturated solid solution of Zn. ability. The invention is applied in the field of material processing.

Description

technical field [0001] The invention belongs to the field of material processing engineering, and in particular relates to a method for preparing a high-Zn light-weight high-strength aluminum alloy. Background technique [0002] The characteristics of rich reserves, low density and high specific strength of aluminum alloys perfectly meet the needs of "lightweight" and have broad application prospects. Among them, Al-Zn-Mg alloys, as a kind of ultra-high-strength aluminum alloys that can be strengthened by heat treatment, have good fatigue properties. , high specific strength and other advantages are widely used in aerospace, rail transit and other fields. The traditional castings are prone to defects such as macrosegregation, cracking and grain coarsening due to slow cooling during the preparation process. Since Zn is a low melting and boiling point element, directly adding high content of Zn during the casting process will lead to forming failure There are a large number o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10B22F10/28C22C1/04B22F9/04B33Y70/00B33Y10/00
CPCC22C21/10B22F10/28C22C1/0416B22F9/04B33Y70/00B33Y10/00B22F2009/043Y02P10/25
Inventor 雷正龙秦熙琨黎炳蔚吴世博张新瑞陈彦宾
Owner HARBIN INST OF TECH
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