Stress-driven migration of low-angle grain boundaries in nanocomposites with incoherent inclusions. / Konakov, Ya.V.; Ovid'ko, I.A.; Sheinerman, A.G.
In: Materials Physics and Mechanics, No. 2, 2015, p. 97-106.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Stress-driven migration of low-angle grain boundaries in nanocomposites with incoherent inclusions
AU - Konakov, Ya.V.
AU - Ovid'ko, I.A.
AU - Sheinerman, A.G.
PY - 2015
Y1 - 2015
N2 - © 2015, Institute of Problems of Mechanical Engineering.We consider migration of low-angle tilt boundaries in nanocrystalline and ultrafine-grained composites each consisting of a metallic matrix and nanoscale incoherent inclusions. Within the model, grain boundaries are considered as the walls of edge dislocations that slip in the metallic matrix but cannot penetrate nanoinclusions. Using the two-dimensional dislocation dynamics simulations, we revealed two principle modes of migration of low-angle grain boundaries. In the first mode, migrating grain boundaries are retarded by nanoinclusions, and grain boundary migration stops. In the second regime, some segments of the migrating grain boundaries are retarded by inclusions while others proceed to migrate by large distances. The transition from the first mode to the second one occurs when the resolved shear stress reaches some critical stress τc. The critical stress increases with increasing the volume fraction of inclusions, while an increase in the distance
AB - © 2015, Institute of Problems of Mechanical Engineering.We consider migration of low-angle tilt boundaries in nanocrystalline and ultrafine-grained composites each consisting of a metallic matrix and nanoscale incoherent inclusions. Within the model, grain boundaries are considered as the walls of edge dislocations that slip in the metallic matrix but cannot penetrate nanoinclusions. Using the two-dimensional dislocation dynamics simulations, we revealed two principle modes of migration of low-angle grain boundaries. In the first mode, migrating grain boundaries are retarded by nanoinclusions, and grain boundary migration stops. In the second regime, some segments of the migrating grain boundaries are retarded by inclusions while others proceed to migrate by large distances. The transition from the first mode to the second one occurs when the resolved shear stress reaches some critical stress τc. The critical stress increases with increasing the volume fraction of inclusions, while an increase in the distance
M3 - статья
SP - 97
EP - 106
JO - ФИЗИКА И МЕХАНИКА МАТЕРИАЛОВ
JF - ФИЗИКА И МЕХАНИКА МАТЕРИАЛОВ
SN - 1605-2730
IS - 2
ER -
ID: 4012245