Diffusive-to-ballistic transition in grain boundary motion studied by atomistic simulations
Author(s)
Deng, Chuang; Schuh, Christopher A.
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An adapted simulation method is used to systematically study grain boundary motion at velocities and driving forces across more than five orders of magnitude. This analysis reveals that grain boundary migration can occur in two modes, depending upon the temperature (T) and applied driving force (P). At low P and T, grain boundary motion is diffusional, exhibiting the kinetics of a thermally activated system controlled by grain boundary self-diffusion. At high P and T, grain boundary migration exhibits the characteristic kinetic scaling behavior of a ballistic process. A rather broad transition range in both P and T lies between the regimes of diffusive and ballistic grain boundary motion, and is charted here in detail. The recognition and delineation of these two distinct modes of grain boundary migration also leads to the suggestion that many prior atomistic simulations might have probed a different kinetic regime of grain boundary motion (ballistic) as compared to that revealed in most experimental studies (diffusional).
Date issued
2011-12Department
Massachusetts Institute of Technology. Department of Materials Science and EngineeringJournal
Physical Review B
Publisher
American Physical Society
Citation
Deng, Chuang, and Christopher Schuh. “Diffusive-to-ballistic Transition in Grain Boundary Motion Studied by Atomistic Simulations.” Physical Review B 84.21 (2011): [10 pages] ©2011 American Physical Society.
Version: Final published version
ISSN
1098-0121
1550-235X