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Effect of Nano Twin Boundaries on the Properties of Nanostructured Metals

S.X.Qu  H.F.Zhou  
【摘要】:正Nanoscale twins have attracted significant attention due to their unique roles in the strengthening of nanostructured metals.It has been shown that twin planes in the nano-twinned metals provide adequate barriers to dislocation transmission,leading to a Hall-Petch-type relationship between the strength and the decreasing twin boundary spacing,similar to the effect of traditional grain boundary strengthening in nanocrystalline metals.In this study,atomistic simulations and theoretical modeling have revealed twin boundary migration governed by thermal fluctuations on coherent twin planes.Dislocation sources such as free surface and grain boundaries are absent in our simulations.Detailed atomic analysis reveals that TB migration in single face-centered-cubic metals is a process consisting of nucleation,expansion and annihilation of dislocation loops on successive {111} planes.The strong temperature dependence of twin boundary migration is well captured by a simple model.

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