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Relationship between microstructure evolution and thermal conductivity of Mg–Sn–Ca alloys

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Abstract

The relationship between microstructure evolution and thermal conductivity of the Mg–Sn–Ca alloys with various contents was investigated. The microstructures of Mg–2Sn–xCa alloys showed significant changes with different Ca contents. The addition of Ca can effectively improve the thermal conductivity of Mg–2Sn alloy. The thermal conductivity was remarkably improved to 147 W/(m·K) when the Sn/Ca atomic ratio was 1:1. The significant increase owes to the consumption of solute atoms and elimination of high-resistance Sn-rich regions. Mg–Sn–Ca alloys with Sn/Ca atomic ratio of 1 exhibited different solidification behaviors as the content increased. The thermal conductivity decreased linearly when the Sn content was below 3 wt% and then decreased rapidly at Sn content above 3 wt%. The former was dominated by the precipitated phase, while the latter was caused by Sn-enriched regions with high resistance.

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Authors and Affiliations

  1. Department of Metallic Materials, School of Materials Science and Engineering, South China University of Technology, 381 Wushan Rd, Guangzhou, 510640, Guangdong, China

    Xiong Zhou, Gan Luo, Liling Mo & Jun Du

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Zhou, X., Luo, G., Mo, L. et al. Relationship between microstructure evolution and thermal conductivity of Mg–Sn–Ca alloys. Journal of Materials Research 37, 3720–3730 (2022). https://doi.org/10.1557/s43578-022-00746-4

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