|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Alloys and Compounds for Thermoelectric and Solar Cell Applications V
||L-14: Effect of Microstructure of the Thermoelectric Properties of Al-based Intermetallic Compounds Prepared by a Melt-spinning Method
||Akira Umeda, Ken Kurosaki, Masaya Kumagai, Yuji Ohishi, Hiroaki Muta, Shinsuke Yamanaka
|On-Site Speaker (Planned)
We have focused on Al-based thermoelectric (TE) materials, such as RuAl<SUB>2</SUB> and VAl<SUB>3</SUB>, which can be candidates of low-toxicity/cost-effective TE materials. Although Al-based TE materials show high power factor, the dimensionless figure of merit <I>zT</I> is low, due to their relatively high lattice thermal conductivity (<I>κ</I><SUB>lat</SUB>). Since <I>κ</I><SUB>lat</SUB> is dependent on the microstructure of bulk materials, the microstructure-control is an effective way to reduce the <I>κ</I><SUB>lat</SUB>. In the present study, we prepared the bulk samples of RuAl<SUB>2</SUB> and VAl<SUB>3</SUB> by melt-spinning followed by spark plasma sintering, where the microstructure was controlled by mainly changing the cooling rate. The effect of microstructure, in particular the grain size, on the <I>κ</I><SUB>lat</SUB> as well as other TE properties of RuAl<SUB>2</SUB> and VAl<SUB>3</SUB> will be discussed.
||Planned: Supplemental Proceedings volume