About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
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Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
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Presentation Title |
Suppression of Abnormal Grain Growth in Alumina by Grain Boundary Engineering |
Author(s) |
Bryan M. Conry, Joel B Harley, Michael R Tonks, Michael S Kesler, Amanda R Krause |
On-Site Speaker (Planned) |
Bryan M. Conry |
Abstract Scope |
Contemporary grain growth models have yet to account for the true relationship between grain boundary character and mobility/energy anisotropy. As a result, unique grain growth phenomena in many material systems remain poorly understood – one example being anisomorphic abnormal grain growth. One method to explore this problem is grain boundary engineering (GBE) of a material system known to exhibit these phenomena. Here, we employ thermomagnetic processing to strongly texture the microstructure of asymmetric Ca-doped Al2O3 by slip casting under a 9T magnetic field. The textured alumina, along with an untextured analog, was heat treated at 1600°C for 64 hours to investigate differences in grain growth behavior. Atomic force microscopy and electron microscopy techniques are used to identify the energy and character, respectively, of normal and abnormal grain boundaries in the two systems. Implications of texture and resulting grain boundary character on abnormal grain growth behavior will be discussed. |