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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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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.

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Acknowledgements

This work was financially supported by the the National Natural Science Foundation of China (Nos. 51801079 and 52001140), the Natural Science Foundation for Young Scientists of Jiangsu, China (Nos. BK20180985 and BK20180987), and the Open Foundation of Zhenjiang Key Laboratory for High Technology Research on Marine Functional Films (No. ZHZ2019001).

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  1. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China

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

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  1. Yaoxiang Geng
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  2. Hao Tang
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  3. Junhua Xu
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  4. Yu Hou
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Geng, Y., Tang, H., Xu, J. et al. 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, 1770–1779 (2022). https://doi.org/10.1007/s12613-021-2287-1

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