| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces in Ceramics: Fundamental Structure—Property—Performance Relationships
|
| Presentation Title |
Interface Migration: From Grain Boundary Structure to Microstructure Evolution |
| Author(s) |
David Joseph Srolovitz, Jian Han, Marco Salvalaglio |
| On-Site Speaker (Planned) |
David Joseph Srolovitz |
| Abstract Scope |
Most models of grain growth/microstructure evolution start from an ansatz about the underlying interface/grain boundary (GB) equations of motion. In most cases, these are deduced from thermodynamic models and the assumption that GB motion is overdamped; the GB parameters may be fit to experimental observations. Here, we present a derivation of the GB equation of motion that, unlike most models, respects the bicrystallography, the underlying mechanisms of how GBs move, and the intrinsic anisotropy. The GB migration mechanism is disconnection motion (disconnections are line defects with dislocation and step character). Our new equation of motion is directly applicable to arbitrary grain shapes, microstructure topology and anisotropy. We apply this equation of motion in a sharp interface formalism for simple geometries and in a diffuse interface simulation. We apply the diffuse interface method to nucleation of precipitates, followed by growth and impingement, and finally followed by grain growth. |