Effect of chemical composition and microstructure on the thermal conductivity of Mg-Al-Ca alloys

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  • Kirimoto Yuichi
    Department of Nano and Functional Material Science Graduate School of Science and Engineering for Education, University of Toyama
  • Kondo Natsuki
    School of Sustainable Design Materials and Engineering, University of Toyama
  • Ito Mizuki
    Program of Materials Science and Engineering Studies in Science and Engineering Graduate School of Science and Engineering, University of Toyama
  • Tsukeda Tadayoshi
    Faculty of Sustainable Design Academic Assembly, University of Toyama
  • Aida Tetsuo
    Faculty of Sustainable Design Academic Assembly, University of Toyama
  • Tabata Hironobu
    CHUETSU METAL WORKS CO., LTD.
  • Kurihara Hideki
    Saitama Industrial Technology Center
  • Suzuki Mayumi
    Department of Mechanical Systems Engineering Faculty of Engineering, Toyama Prefectural University

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Other Title
  • Mg-Al-Ca系合金の熱伝導率に及ぼす化学組成とミクロ組織の影響

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<p>In recent years, the increasing demand for electric vehicles, digital devices such as PCs and smartphones, and renewable energy storage systems has created a need for higher-performance batteries. Accordingly, the thermal conductivity of the case that houses the battery is becoming increasingly important. In this study, compositions with high thermal conductivity and good castability were investigated, focusing on Mg-Al-Ca alloys, and the relationship between the two was examined through thermal conductivity measurements and microstructural observations. As a result, the Mg-6%Al-4%Ca alloy was optimal in terms of castability and thermal conductivity. It was confirmed that a lower Al solid solution capacity and a higher purity of the matrix phase are important to improve the thermal conductivity. It is also suggested that the second phase, platelet Al2Ca, is likely to be recognized and enriched in the matrix, contributing to the improvement of thermal conductivity. The amount of Ca solid solution in the matrix was suggested to be reduced by the enrichment of Al in the matrix. The Ca solid solution in the matrix was found to be less effective in reducing thermal conductivity than the Al solid solution.</p>

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