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Effect of Heat Treatment on Microstructure and Properties of Selective Laser Melting AlSi10Mg Alloy

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Abstract

AlSi10Mg alloy was prepared by selective laser melting (SLM) using self-made AlSi10Mg powder as raw material. Optical microscope, scanning electron microscope, electron backscattering instrument, and x-ray diffractometer were used to compare and study the differences of microstructure and properties of AlSi10Mg alloy before and after heat treatment. The results show that the AlSi10Mg alloy formed by SLM is mainly composed of α-Al solid solution and network eutectic Si, and with a small amount of Mg2Si precipitates, the mechanical properties are better than those of traditional casting alloys. The molten pool is composed of fine grain zone, coarse grain zone and heat affected zone. The grain size of each zone is different. The center of the molten pool is mainly equiaxed grains randomly distributed, and the boundary of the molten pool is mainly columnar grains preferentially growing along <111> , forming weak brass texture. With the increase of heat treatment temperature, the reticulate eutectic Si gradually dissolves and breaks into particles, and is further coarsened and spheroidized. The strength and hardness of the alloy decrease and the elongation increases. Columnar grains gradually transform into equiaxed grains, the preferred orientation of grains weakens and the texture gradually disappears. Due to the continuous slip and climbing of dislocations, the small-angle grain boundaries gradually change to large-angle grain boundaries, the average grain orientation difference increases, the proportion of low coincidence site lattice grain boundaries increases, and the intergranular corrosion resistance of the alloy is enhanced.

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Acknowledgments

This work was financially supported by the Natural Science Foundation of Hunan Province (2023JJ50174), and the Project of Industry-University Cooperation and Collaborative Education of Chinese Ministry of Education (BINTECH-KJZX-20220831-37).

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Authors and Affiliations

  1. College of Materials and Advanced Manufacturing, Hunan University of Technology, Zhuzhou, 412007, Hunan, China

    Haigen Jian, Man Yang, Wu Fang & **aomei Yang

  2. Shandong Key Laboratory of Advanced Aluminum Materials and Technology, Binzhou, 262207, Shandong, China

    Haigen Jian & Junjun Pai

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Jian, H., Yang, M., Fang, W. et al. Effect of Heat Treatment on Microstructure and Properties of Selective Laser Melting AlSi10Mg Alloy. J. of Materi Eng and Perform (2024). https://doi.org/10.1007/s11665-024-09271-3

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  • DOI: https://doi.org/10.1007/s11665-024-09271-3

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