About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
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Symposium
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Integration between Modeling and Experiments for Crystalline Metals: From Atomistic to Macroscopic Scales III
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Presentation Title |
Phase-field Simulations of Translation of Grains in Strain-energy-driven Grain Growth |
Author(s) |
Guanglong Huang, David Montiel, Matthew J. Higgins, Jiwoong Kang, Ning Lu, Ashwin J. Shahani, Katsuyo Thornton |
On-Site Speaker (Planned) |
Guanglong Huang |
Abstract Scope |
Recent experiments have identified unexpectedly large grain translations during non-isothermal annealing. Through phase-field simulations, we show that this phenomenon can be induced by dislocation density gradients between grains. For these simulations, we extended a phase-field model for grain growth that accounts for the contribution of stored strain energy due to dislocations. We approximate the initial dislocation density field as a weighted average of the dislocation density in each grain and simultaneously solve for the evolution of the grains and the dislocation density. Our results show that net grain translation is observed in grains with a medium dislocation density that grow, on one end, at the expense of adjacent grains of high dislocation density and are consumed, on the opposite end, by adjacent grains of low dislocation density. This effect reveals a complexity in the dynamics of microstructure evolution that cannot be described by conventional models of capillary-driven grain growth. |