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Effect of Al content on microstructure, thermal conductivity, and mechanical properties of Mg–La–Al–Mn alloys

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Abstract

In this study, the microstructure, thermal conductivity, and mechanical properties of Mg–4La–xAl–0.5Mn (x = 0, 0.5, 1, 1.5, 2, and 2.5 wt%) alloys were investigated. As the Al content of the alloys increases, the continuous network Mg12La phase is gradually replaced by non-network Al–La phases. The types of Al–La phases depend on the Al content. When the Al content is relatively low, the alloy tends to form Al2La or Al53La22 phases; otherwise, it tends to form an Al11La3 phase. The concentration of the Al solute atoms in the α-Mg matrix increases gradually as the Al content increases. The thermal conductivity is very sensitive to the concentration of Al solute atoms. The thermal conductivity of high-pressure die cast Mg–4La–2.5Al–0.5Mn alloy is 106.5 W/(m·k) and its yield stress, tensile strength, and elongation are 149 MPa, 253 MPa, and 11.5%, respectively.

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Acknowledgments

This study was supported by the collaboration research project between Hitachi (China) Research & Development Corporation and Shanghai Jiao Tong University. This work was also financially supported by Shanghai Science and Technology Committee (No. 18511109302) and the National Natural Science Foundation of China (No. 51825101).

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Authors and Affiliations

  1. Hitachi (China) Research & Development Corporation, Rui Jin Building, No. 205 Maoming Road(S), Shanghai, 200020, China

    Xingfeng Zhao, Wenke Zhou & Ming Qin

  2. National Engineering Research Center of Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China

    Zixin Li, Dejiang Li & Xiaoqin Zeng

  3. The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China

    Xiaoqin Zeng

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  1. Xingfeng Zhao
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Zhao, X., Li, Z., Zhou, W. et al. Effect of Al content on microstructure, thermal conductivity, and mechanical properties of Mg–La–Al–Mn alloys. Journal of Materials Research 36, 3145–3154 (2021). https://doi.org/10.1557/s43578-021-00319-x

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