About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
|
| Presentation Title |
4D Observations of Grain Growth in Polycrystalline Alumina |
| Author(s) |
Hailey E. Hall, Daniel P. DeLellis, Michael S. Kesler, Amanda R. Krause |
| On-Site Speaker (Planned) |
Hailey E. Hall |
| Abstract Scope |
Classical models for grain growth rely upon topological features such as curvature to predict growth behavior. Despite advances in modeling anisotropic grain boundary (GB) energy and mobility, simulations still fail to accurately capture growth behavior seen experimentally in polycrystals. A better mechanistic understanding of GB motion is required to develop models that correctly predict microstructure evolution. Here, polycrystalline alumina is used to assess the viability of classical models and study the role of GB energy and mobility anisotropy on growth. Texture and dopants are used to change GB character to learn how mobility and energy anisotropy influence microstructural evolution. Alumina microstructures are characterized in 3D as a function of heat treatment time using laboratory diffraction contrast tomography. Individual grains are tracked over time to determine curvature, migration distance, and GB character. These 4D studies reveal that topological features including curvature and number of neighbors are poor predictors for growth behavior. |