A grain boundary phase transition studied by molecular dynamics

P. Deymier, A. Taiwo, G. Kalonji

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

We have conducted a thorough investigation of the high temperature behaviour of crystalline interfaces in 2-dimensional close-packed and 3-dimensional f.c.c. Σ = 7 bicrystals using the atomistic computer simulation technique of molecular dynamics. Gibbs free energies of the bicrystals were computed using the determinant technique and a computer calorimetry technique which we describe. The thermodynamic properties of the boundary were monitored over a wide range of temperatures, up to the bulk melting point. We observed a first order phase transition of the grain boundary in the 2D and 3D bicrystals at temperatures well below the bulk melting temperature. At the transition temperature the crystalline grain boundaries are replaced by highly disordered liquid-like layers.

Original languageEnglish (US)
Pages (from-to)2719-2730
Number of pages12
JournalActa Metallurgica
Volume35
Issue number11
DOIs
StatePublished - Nov 1987
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)

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