Migration of inclusions in a matrix due to a spatially varying interface energy

SCRIPTA MATERIALIA

卷:206

Article

Zhang, Qian¹  Barnett, Scott¹  Voorhees, Peter¹ 

[1] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA

关键词: Particle migration;    Interface energy depends on a field varying;    with location;    Interface diffusion;    Bulk diffusion;   

DOI  :  10.1016/j.scriptamat.2021.114235

来源: Elsevier

【 摘 要 】

An interfacial energy can be a function of a bulk field such as temperature or electric field. We find that in a system with a gradient in temperature or electric potential, the resulting variation in interfacial energy can induce a particle to migrate by either surface or bulk diffusion. For a circular particle under a constant unidirectional gradient in the bulk field, the field dependence of the interfacial energy induces a circular particle to move as a circle at a constant velocity along the direction from higher to lower interfacial energy. A linear stability analysis of this steady state migration suggests that perturbations will damp out as time evolves, and thus under these conditions a migrating circular particle is morphologically stable. Other spatial distributions of interface energy can lead to the distortion of an initially circular shaped particle during migration. A phase field model is developed that captures these distortions and verifies the theoretical results mentioned above. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free