A weak compatibility condition for precipitation with application to the microstructure of PbTe-Sb2Te3 thermoelectrics

Xian Chen, Shanshan Cao, Teruyuki Ikeda, Vijay Srivastava, G. Jeffrey Snyder, Dominique Schryvers, Richard D. James

Research output: Contribution to journalArticle

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Abstract

We propose a weak condition of compatibility between phases applicable to cases exhibiting full or partial coherence and Widmanstätten microstructure. The condition is applied to the study of Sb2Te 3 precipitates in a PbTe matrix in a thermoelectric alloy. The weak condition of compatibility predicts elongated precipitates lying on a cone determined by a transformation stretch tensor. Comparison of this cone with the long directions of precipitates determined by a slice-and-view method of scanning electron microscopy combined with focused ion beam sectioning shows good agreement between theory and experiment. A further study of the morphology of precipitates by the Eshelby method suggests that interfacial energy also plays a role and gives an approximate value of interfacial energy per unit area of 250 dyn cm-1.

Original languageEnglish (US)
Pages (from-to)6124-6132
Number of pages9
JournalActa Materialia
Volume59
Issue number15
DOIs
StatePublished - Sep 1 2011

Keywords

  • Compatibility
  • Precipitation
  • Thermoelectric materials
  • Widmanstätten microstructure

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