| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces in Functional Materials: Fundamental Structure-Property-Performance Relationships
|
| Presentation Title |
Equilibrium and Kinetic Shapes of Grains in Polycrystals |
| Author(s) |
Wolfgang Rheinheimer, John E. Blendell, Carol A. Handwerker |
| On-Site Speaker (Planned) |
Wolfgang Rheinheimer |
| Abstract Scope |
We present a suite of measurements and combined analyses of grain growth of large, oriented single crystals into polycrystals. The growth distance, its standard deviation and the microstructure evolution along the single crystal-matrix interface are used to characterize the migration behavior as a function of temperature, time, and interface orientation. The relative grain boundary mobility was determined between 1250 °C and 1600 °C for the four most important orientations {100}, {110}, {111} and {310}. The conclusions are that the kinetic shapes observed in the microstructures are dominated by the growing side of the interface and not by the dissolving side. The implications for grain growth underscore the applicability of crystal growth models to grain growth in polycrystals. In particular, in strontium titanate, the anisotropy of the grain boundary mobility is reduced from five macroscopic parameters to two easing the incorporation of growth rate anisotropy in simulations of microstructure evolution. |