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Elucidating the Kinetics of Twin Boundaries from Thermal Fluctuations

Dengke Chen (University of Houston), YASHASHREE KULKARNI (UNIVERSITY OF HOUSTON)

From Atomistics to Reality: Spanning Scales in Simulations and Experiments Symposium B

Mon 4:20 - 5:40

CIT 227

There is compelling evidence for the critical role of twin boundaries in imparting an extraordinary combination of strength, and ductility to nanotwinned metals. In this talk, we will present our recent investigation of the thermal fluctuations of twin boundaries in fcc metals to elucidate the deformation mechanisms governing their kinetic properties, by way of molecular dynamics simulations. Our results reveal that the twin boundary motion is strongly coupled to shear deformation up to 0.95 homologous temperature. A rather unexpected observation is that coherent twin boundaries do not exhibit any capillarity-induced fluctuations even at high temperatures, in sharp contrast to other high angle grain boundaries.