| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
ACerS-ECerS Joint Symposium: Emerging Leaders in Glass and Ceramics
|
| Presentation Title |
The Role of Anisotropic Grain Boundary Energy in Grain Growth of Textured Alumina |
| Author(s) |
Amanda Krause, Bryan Conry, Lin Yang, Michael Kesler, Michael Tonks |
| On-Site Speaker (Planned) |
Amanda Krause |
| Abstract Scope |
Modeling grain growth is critical to improving processing control of microstructures and, thus, properties of ceramics. The accuracy of such models is limited by poor understanding of how anisotropic grain boundary energy affects local migration. This work compares the grain growth of untextured and textured Ca-doped alumina to elucidate the effects of such grain boundary anisotropy. We find that the textured microstructures exhibit a faster growth rate and aligned grains elongating within the basal plane. To explore the grain boundary migration mechanism responsible for this growth behavior, we used Monte Carlo Potts simulations that incorporate anisotropic grain boundary energy and mobility as a function of plane inclination. The simulations suggest that a grain boundary replacement mechanism, in which low energy boundaries replace those of high energy, is responsible for the anisomorphic grain shape observed experimentally. The implications of these results on predicting grain growth in ceramics will be discussed. |