| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Deformation and Transitions at Grain Boundaries VII
|
| Presentation Title |
Pinning of a Grain Boundary Migration by Coherent Second Phase Particles |
| Author(s) |
Nan Wang, Youhai Wen, Long-Qing Chen |
| On-Site Speaker (Planned) |
Long-Qing Chen |
| Abstract Scope |
Pinning of grain boundary migration using second-phase particles is one of the most efficient ways to limit the grain growth of a polycrystalline grain structure. An interfacial-energy-based pinning theory proposed by Zener has long been used to explain the pinning mechanism of second phase particles on grain boundary migration. Coherent second-phase particles are often designed to strengthen alloys to block dislocation motion. However, they also interact with migrating grain boundaries by exerting pinning forces on them during their migration. Here we present a novel pinning mechanism originated from the lattice misfit strain between coherent second phase particles and matrix and validate it by performing phase-field-crystal simulations. It is found that, depending on the relative contribution of interfacial energy and elastic energy, coherent second particles exhibit two modes of pinning with the strongest pinning effect taking place at the crossover region of the two pinning modes. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |