Abstract

Twinning in body-centered cubic metals is typically attributed to glide of 1/6<111> dislocations originated from material defects. Here we report an alternative mechanism for twin formation in body-centered cubic nanowires using molecular dynamics simulations. In this mechanism, twinning is triggered by dissociation of the 1/6<111> dislocation into two 1/12<111> partials gliding on adjacent {211} planes. By comparing the generalized stacking fault energies of the two competing twin boundary configurations in five different BCC crystals, the propensity of a particular mechanism to occur is evaluated. The fundamental insight gained from this study will help engineer nanoscale materials with novel mechanical properties.

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