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Kinetics of densification/phase transformation and transport properties of Mg-Sn cubic/trigonal composites
Materials Science and Engineering: B ( IF 3.6 ) Pub Date : 2020-07-02 , DOI: 10.1016/j.mseb.2020.114607
A.Y. Fong , Y. Kodera , M. Murata , T. Imai , H. Xu , M.R. Dirmyer , S.J. Obrey , J.E. Garay

The Mg-Sn materials are interesting because of useful semiconducting properties and particularly because of their earth abundant, environmentally friendly constituent elements. The cubic Mg2Sn phase appears in the equilibrium phase diagram and has been extensively studied, while the transport properties of the trigonal phase—that does not appear in the phase diagram—have not been reported. We produced dense composites composed of cubic (stable) and trigonal (metastable) phases using a combination of high energy ball milling and current activated pressure assisted densification (CAPAD). We present a kinetic study of the densification and cubic to trigonal phase transformation. In addition, we present transport property measurements of cubic/trigonal composites. We determine densification rates and observe distinct densification regimes, attributed to the cubic-to-tetragonal phase transformation as well as porosity removal. Transport property measurements reveal that altering the amount of metastable phase in the composites changes both the electrical and thermal properties. The electrical conductivity significantly increases with increasing trigonal phase fraction. The thermal conductivities are similar for all compositions, which is likely due to the nanocrystalline character of the composites.



中文翻译:

Mg-Sn立方/三角形复合材料的致密化/相变和传输性质的动力学

Mg-Sn材料之所以有趣,是因为它具有有用的半导体性能,尤其是因为它们富含地球,对环境友好。立方镁2Sn相出现在平衡相图中,并且已经进行了广泛的研究,而三角相的传输特性(未出现在相图中)尚未得到报道。我们结合高能球磨和电流活化压力辅助致密化(CAPAD)的组合,生产了由立方相(稳定)和三角相(易变)组成的致密复合材料。我们提出了致密化和立方到三角相变的动力学研究。此外,我们介绍了立方/三角形复合材料的传输性能测量。我们确定致密化速率并观察到不同的致密化机制,这归因于立方相到四方相的转化以及孔隙的去除。传输性质的测量表明,改变复合材料中的亚稳态相的量会同时改变电学性质和热学性质。电导率随着三角相分数的增加而显着增加。对于所有组合物,热导率都相似,这很可能是由于复合材料的纳米晶特征。

更新日期:2020-07-02
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