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Preparation method of high-Zn light-weight high-strength aluminum alloy

An aluminum alloy, lightweight technology used in the field of material processing engineering to achieve high mixing efficiency, avoid porosity defects, and increase temperature gradients

Active Publication Date: 2021-09-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Preparation method of high-Zn light-weight high-strength aluminum alloy
  • Preparation method of high-Zn light-weight high-strength aluminum alloy
  • 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-containing powder and Zr-containing powder respectively. The diameter is concentrated in the range of 80-100μm.

[0047] Step 2: use an electronic balance to weigh the powders of different elements according to the powder ratio of the above-mentioned Al-14Zn-2Mg-2Zr: promptly take 2g Zr powder, 2g Mg-containing powder and 14gZn powder and 82gAl powder, and mix the above powder Mix 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 rotating speed of 400 rpm, stop for 5 minutes after rotating for 5 minutes, and cool down for 6 hours .

[0049] The powder form after mixing is as fig...

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 a 0°C coolant 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 is 120...

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Abstract

The invention discloses a preparation method of a high-Zn light-weight high-strength aluminum alloy, relates to the field of material processing engineering, and relates to a high-strength aluminum alloy preparation method based on selective laser melting, which adapts to the processing characteristics of selective laser melting and realizes further strengthening of the performance of the aluminum alloy. The invention designs Al-Zn-Mg-Zr alloy powder suitable for the selective laser melting technology, and the burning loss of Zn is reduced to the maximum extent on the basis that effective connection is achieved by controlling the lap joint rate between adjacent melting channels to be -5 percent to 5 percent. Meanwhile, different from preheating of a base plate in other aluminum alloy forming processes, the base plate is further cooled, cooling liquid is introduced to the bottom and the side face of the base plate for cooling, and the temperature gradient is increased, so that the supersaturated solid solution capacity of Zn is further improved. The preparation method of the high-Zn light-weight high-strength aluminum alloy provided by the invention is applied to 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 Applications(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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