About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
|
| Presentation Title |
4D Observations of Microstructural Evolution in Textured and Untextured Alumina |
| Author(s) |
Hailey E. Hall, Miles Haraldsson, Michael Kesler, Amanda Krause |
| On-Site Speaker (Planned) |
Hailey E. Hall |
| Abstract Scope |
Mechanisms behind grain growth behavior in polycrystals remain poorly understood. Here, laboratory diffraction contrast tomography is used to characterize textured and untextured alumina microstructures in 3D to determine which factors influence grain growth. Features such as grain morphology, grain boundary (GB) plane distribution, and GB curvature are measured over multiple heat treatment timesteps to determine how these factors influence GB velocity and growth behavior. In undoped alumina, grains in textured and untextured microstructures share similar morphologies with modest grain elongation. Grain growth rates in undoped, textured alumina are lower than those observed in undoped, untextured alumina. These results contrast sharply with evolution seen in Ca-doped alumina, which exhibits severe grain elongation and a faster grain growth rate in the textured microstructure as compared to the untextured case. We hypothesize that the differences in growth behavior between the undoped and Ca-doped alumina can be attributed to variations in GB stiffness. |