Atomistic simulations of intersection cross-slip nucleation in L1(2) Ni3Al

SI Rao and DM Dimiduk and TA Parthasarathy and MD Uchic and C Woodward, SCRIPTA MATERIALIA, 66, 410-413 (2012).

DOI: 10.1016/j.scriptamat.2011.12.002

Using atomistic simulations, the authors evaluate the activation barrier for a screw superdislocation to form the Paidar-Pope-Vitek (PPV) locked configuration when intersecting a forest dislocation in L1(2) Ni3Al, as a function of the superpartial core width. It is shown that the PPV lock is stable at the intersection, unlike when formed along an isolated dislocation line, and that the activation energy for cross slip at the forest dislocation intersection is significantly lower than that for cross slip along an isolated dislocation. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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