|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Alloys and Compounds for Thermoelectric and Solar Cell Applications IX
||Phase Interface Formation Induced by Phase Separation Process in Thermoelectric Mg2(Si, Sn) Alloys and (Zr, Ti)NiSn Alloys
||Yoshisato Kimura, Yaw Wang Chai, Manabu Watanabe, Yonghoon Lee
|On-Site Speaker (Planned)
Formation of solid solution of a compound phase is very effective to reduce the lattice thermal conductivity. In the case that a solid solution phase is formed having compositional difference (gradient) of solute atoms, phase separation with interface formation is induced in order to release the elastic energy due to a lattice misfit. As the objective of the present work, we focused on the formation mechanism of phase separation induced interfaces, and microstructure control based on phase separation process. We have observed and analyzed phase interfaces which are formed due to the phase separation in two alloy systems, one between Mg2Si–Mg2Sn phases during solidification process and the other between ZrNiSn–TiNiSn phases during heat treatments. We have determined the formation of sharp interfaces in the former alloys and quite diffuse interfaces in the latter alloys. The lattice thermal conduction can effectively be reduced in both alloys.
||Electronic Materials, Energy Conversion and Storage, Other