A phase-field model for elastically anisotropic polycrystalline binary solid solutions

Tae Wook Heo, Saswata Bhattacharyya, Long Qing Chen

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Abstract

A phase-field model for modeling the diffusional processes in an elastically anisotropic polycrystalline binary solid solution is described. The elastic interactions due to coherency elastic strain are incorporated by solving the mechanical equilibrium equation using an iterative-perturbation scheme taking into account elastic modulus inhomogeneity stemming from different grain orientations. We studied the precipitate interactions among precipitates across a grain boundary and grain boundary segregation-precipitate interactions. It was shown that the local pressure field from one coherent precipitate influences the shape of precipitates in other grains. The local pressure distribution due to primary coherent precipitates near the grain boundary leads to inhomogeneous solute distribution along the grain boundary, resulting in non-uniform distribution of secondary nuclei at the grain boundary.

Original languageEnglish (US)
Pages (from-to)1468-1489
Number of pages22
JournalPhilosophical Magazine
Volume93
Issue number13
DOIs
StatePublished - May 1 2013

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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