Influence of process parameters and aging treatment on the microstructure and mechanical properties of AlSi8Mg3 alloy fabricated by selective laser melting

Yaoxiang Geng; Hao Tang; Junhua Xu; Yu Hou; Yuxin Wang; Zhen He; Zhijie Zhang; Hongbo Ju; Lihua Yu

doi:10.1007/s12613-021-2287-1

Volume 29 Issue 9

Sep. 2022

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2022 > 29(9): 1770-1779

Yaoxiang Geng, Hao Tang, Junhua Xu, Yu Hou, Yuxin Wang, Zhen He, Zhijie Zhang, Hongbo Ju, and Lihua Yu, Influence of process parameters and aging treatment on the microstructure and mechanical properties of AlSi8Mg3 alloy fabricated by selective laser melting, Int. J. Miner. Metall. Mater., 29(2022), No. 9, pp. 1770-1779. https://doi.org/10.1007/s12613-021-2287-1

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Yaoxiang Geng, Hao Tang, Junhua Xu, Yu Hou, Yuxin Wang, Zhen He, Zhijie Zhang, Hongbo Ju, and Lihua Yu, Influence of process parameters and aging treatment on the microstructure and mechanical properties of AlSi8Mg3 alloy fabricated by selective laser melting, Int. J. Miner. Metall. Mater., 29(2022), No. 9, pp. 1770-1779. https://doi.org/10.1007/s12613-021-2287-1

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Research Article

Influence of process parameters and aging treatment on the microstructure and mechanical properties of AlSi8Mg3 alloy fabricated by selective laser melting

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Corresponding authors:
Yaoxiang Geng E-mail: yaoxianggeng@163.com

Yuxin Wang E-mail: ywan943@163.com
Received: 13 February 2021; Revised: 29 March 2021; Accepted: 30 March 2021; Available online: 31 March 2021

Abstract

Abstract

Many studies have investigated the selective laser melting (SLM) of AlSi10Mg and AlSi7Mg alloys, but there are still lack of researches focused on Al–Si–Mg alloys specifically tailored for SLM. In this work, a novel high Mg-content AlSi8Mg3 alloy was specifically designed for SLM. The results showed that this new alloy exhibited excellent SLM processability with a lowest porosity of 0.07%. Massive lattice distortion led to a high Vickers hardness in samples fabricated at a high laser power due to the precipitation of Mg₂Si nanoparticles from the α-Al matrix induced by high-intensity intrinsic heat treatment during SLM. The maximum microhardness and compressive yield strength of the alloy reached HV (211 ± 4) and (526 ± 12) MPa, respectively. After aging treatment at 150°C, the maximum microhardness and compressive yield strength of the samples were further improved to HV (221 ± 4) and (577 ± 5) MPa, respectively. These values are higher than those of most known aluminum alloys fabricated by SLM. This paper provides a new idea for optimizing the mechanical properties of Al–Si–Mg alloys fabricated using SLM.
- AlSi8Mg3 alloy;
- selective laser melting;
- process parameters;
- microstructure;
- aging treatment;
- mechanical properties

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