Migration of inclusions in a matrix due to a spatially varying interface energy. (1st January 2022)

• Record Type: Journal Article
• Authors: Zhang, Qian; Barnett, Scott; Voorhees, Peter
• Is Part Of: Scripta materialia. Number 206(2022)
• Publication Date: 2022-01-01
• Subjects: Particle migration -- Interface energy depends on a field varying with location -- Interface diffusion -- Bulk diffusion; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2021.114235
• Languages: English
• ISSNs: 1359-6462

Abstract

Graphical abstract: Abstract: 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.