Processability, Microstructure, and Mechanical Property of Al-Si-Mg-Zr-Cu Alloy Fabricated by Selective Laser Melting

GENG Yaoxiang; SHAN Zhifa; CHEN Yongkang; ZAI Chunfeng; WANG Xiao; GAO Xing; WANG Yuxin

Volume 39 Issue 1

Feb. 2024

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Development and Application of Materials > 2024 > 39(1): 23-29.

GENG Yaoxiang, SHAN Zhifa, CHEN Yongkang, ZAI Chunfeng, WANG Xiao, GAO Xing, WANG Yuxin. Processability, Microstructure, and Mechanical Property of Al-Si-Mg-Zr-Cu Alloy Fabricated by Selective Laser Melting[J]. Development and Application of Materials, 2024, 39(1): 23-29.

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Processability, Microstructure, and Mechanical Property of Al-Si-Mg-Zr-Cu Alloy Fabricated by Selective Laser Melting

School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China

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Received Date: October 09, 2023

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Abstract

In order to improve the strength of the laser selective melted (SLM) Al-Si-Mg aluminum alloy, a Cu-modified Al-Si-Mg-Zr alloy with high Mg content is fabricated. The processability, microstructure, and mechanical property of the SLM-fabricated Al-Si-Mg-Zr-Cu alloy are systematically studied. The results indicate that the sample exhibits good SLM processability at low laser power (250 W), with a maximum relative density of 99.8%. The microstructure of the alloy is mainly composed of equiaxed grains, with a small amount of columnar grains distributed in the melt pool. The grains contain reticular substructures, and there are nanoscale precipitates exising in the α-Al matrix. When the luse power is 250 W, and the scanning speed is 1 200 mm/s, the microhardness, tensile strength, yield strength, and elongation of the samples are (158 ± 4)HV, (461 ± 25) MPa, (397±32) MPa, and (2.4±0.7)%, respectively. The strength of the SLM-fabricated Al-Si-Mg-Zr-Cu alloy is higher than that of the SLM-fabricated Al-Si-Mg alloy.
- selective laser melting,
- Cu-modified Al-Si-Mg-Zr alloy,
- microstructure,
- mechanical property

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Processability, Microstructure, and Mechanical Property of Al-Si-Mg-Zr-Cu Alloy Fabricated by Selective Laser Melting

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