Abstract
The effects of process parameters and aging treatment on the microstructure and mechanical properties of selective laser melting (SLM) fabricated high Mg-content Al-Mg-Sc-Zr aluminum alloy were systematically studied. Our experiment results show that the samples exhibit good processability with porosity less than 1%. The increase of Mg content in Al-Mg-Sc-Zr is beneficial to reduce the texture of the alloy. The laser scanning speed has a large influence on the Vickers hardness of as-fabricated samples. The maximum microhardness of as-fabricated sample reaches 148 ± 2 HV with a compression yield strength of 342 ± 7 MPa. After aging treatment, the distinction in microhardness of the samples obtained under different laser scanning speed is obviously reduced, and the mechanical properties of the samples are further improved with a maximum microhardness of 175 ± 5 HV and a maximum compressive yield strength of 476 ± 10 MPa, which are superior to the known Al-Mg-Sc-Zr alloy with same Sc and Zr content fabricated by SLM. In this study, a novel high Mg-content Al-Mg-Sc-Zr aluminum alloy specifically for SLM with good processability and mechanical properties was reported.
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Acknowledgements
This work was supported by the National Key R&D Program of China (No. 2016YFB1100103), the Natural Science Foundation of China (No. 52001140), the Natural Science Foundation for Young Scientists of Jiangsu, China (No. BK20180985), the Natural Science Foundation in Higher Education of Jiangsu (No. 18KJB430011) and the Open Foundation of Zhenjiang Key Laboratory for high technology research on marine functional films (No. ZHZ2019001).
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Tang, H., Geng, Y., Luo, J. et al. Mechanical Properties of High Mg-Content Al-Mg-Sc-Zr Alloy Fabricated by Selective Laser Melting. Met. Mater. Int. 27, 2592–2599 (2021). https://doi.org/10.1007/s12540-020-00907-2
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DOI: https://doi.org/10.1007/s12540-020-00907-2