|About this Abstract
||Materials Science & Technology 2011
||Phase Stability, Diffusion, Kinetics and their Applications (PSDK-VI)
||Phase Field Simulations of Two Type 4 Boundaries in Quaternary Diffusion Couples
||Xiaoqin Ke, Yunzhi Wang, John Morral
|On-Site Speaker (Planned)
The interdiffusion zone of complex diffusion couples can be divided into regions containing a fixed number of phases. Boundaries between regions can then be classified by the number of phases that change on crossing a boundary. Accordingly a Type 4 boundary is one in which 4 phases change. Such boundaries can form in a quaternary or higher order system, but the diffusion path must pass through special phase diagram features. For a quaternary system, one Type 4 boundary can form only if the diffusion path jumps from a tie-tetrahedron face to a corner, while another requires the path to jump from one tie-tetrahedron edge to another. In the present work, phase field methods were employed to simulate Type 4 boundaries in a model A-B-C-D quaternary system. Both kinds of Type 4 boundaries were successfully simulated suggesting no restrictions beyond the phase rule on the types of boundaries that can form.
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