Mushy-zone microstructure and concentration variation of Co-93wt.%Sb hyperperitectic alloy under TGZM effect

Xuguang Li, Shuangming Li, Li Dou, Wang Hongqiang, Chang Xueqing

科研成果: 期刊稿件会议文章同行评审

摘要

Skutterudite thermoelectric material, CoSb3 is a peritectic compound, and the traditional preparation method needs several days to obtain single-phase CoSb3 by annealing treatment. In this work, we employed temperature gradient zone melting (TGZM) to investigate the microstructure evolution of Co-93wt.%Sb alloy in mushy zone under different thermal stabilization time. Due to the existence of temperature gradient, two mushy zones between complete liquid phase region and solid phase region were observed. There exists a solute gradient across the mushy zone and the solute diffuses from the cold side to the hot side, inducing that the liquid droplet migrates up the temperature gradient. As the thermal stabilization time increases, the volume fraction of the liquid in mushy zone decreases, and the initial solid/liquid interface moves downwards paralleling to the temperature gradient. After 4h thermal stabilization time, the solute concentration is higher in liquid zone than the nominal alloy concentration, and lower in the mushy zone measured by Energy Dispersive Spectroscopy (EDS). By means of TGZM effect, the preparation time for the CoSb3 thermoelectric materials was shortened remarkably.

源语言英语
页(从-至)24-29
页数6
期刊Procedia Manufacturing
37
DOI
出版状态已出版 - 2019
活动9th International Conference on Physical and Numerical Simulation of Materials Processing, ICPNS 2019 - Moscow, 俄罗斯联邦
期限: 10 10月 201915 10月 2019

指纹

探究 'Mushy-zone microstructure and concentration variation of Co-93wt.%Sb hyperperitectic alloy under TGZM effect' 的科研主题。它们共同构成独一无二的指纹。

引用此