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Microstructure and Mechanical Properties of AlSi10Mg Alloy Manufactured by Laser Powder Bed Fusion Under Nitrogen and Argon Atmosphere

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

In order to study the effect of gas atmosphere on forming performance of laser powder bed fusion (LPBF), AlSi10Mg alloy was prepared by direct forming and in situ laser remelting under the shielding gas of argon and nitrogen in this study, and its microstructure and properties were characterized and tested, respectively. The results show that the forming performance of AlSi10Mg under nitrogen atmosphere is better than that of argon. Moreover, in situ laser remelting method can effectively enhance the relative density and mechanical properties of AlSi10Mg, in which the densification is increased to 99.5%. In terms of mechanical properties, after in situ remelting, ultimate tensile strength under argon protection increased from 444.85 ± 8.73 to 489.45 ± 3.20 MPa, and that under nitrogen protection increased from 459.21 ± 13.77 to 500.14 ± 5.15 MPa. In addition, the elongation is nearly doubled and the micro-Vickers hardness is increased by 20%. The research results provide a new regulation control method for the customization of AlSi10Mg properties fabricated by LPBF.

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Acknowledgements

This work was financially supported by the NSFC -Guangdong Joint Foundation Key Project (No. U2001218), the Key-Area Research and Development Program of Guangdong Province (No. 2020B090924002), the National Natural Science Foundation of China (Nos. 51875215, 81772428), the Ministry of Education Key Laboratory of High-Efficiency Near-Net-Shape Forming Technology and Equipment for Metal Materials Open Fund (No. 2019005)

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Authors and Affiliations

  1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640, China

    Yunmian Xiao, Yongqiang Yang, Shibiao Wu, Jie Chen, Di Wang & Changhui Song

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  1. Yunmian Xiao
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  2. Yongqiang Yang
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  3. Shibiao Wu
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  4. Jie Chen
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Correspondence to Changhui Song.

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Xiao, Y., Yang, Y., Wu, S. et al. Microstructure and Mechanical Properties of AlSi10Mg Alloy Manufactured by Laser Powder Bed Fusion Under Nitrogen and Argon Atmosphere. Acta Metall. Sin. (Engl. Lett.) 35, 486–500 (2022). https://doi.org/10.1007/s40195-021-01354-7

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  • DOI: https://doi.org/10.1007/s40195-021-01354-7

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