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Blocking effect of twin boundaries on partial dislocation emission from void surfaces

Lifeng Zhang1, Haofei Zhou1 and Shaoxing Qu12*

Author Affiliations

1 Department of Engineering Mechanics, Zhejiang University, Hangzhou, 310027, China

2 Soft Matter Research Center (SMRC), Zhejiang University, Hangzhou, 310027, China

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Nanoscale Research Letters 2012, 7:164  doi:10.1186/1556-276X-7-164

Published: 2 March 2012


Recent discovery that nanoscale twin boundaries can be introduced in ultrafine-grained metals to improve strength and ductility has renewed interest in the mechanical behavior and deformation mechanisms of these nanostructured materials. By controlling twin boundary spacing, the effect of twin boundaries on void growth is investigated by using atomistic simulation method. The strength is significantly enhanced due to the discontinuous slip system associated with these coherent interfaces. Atomic-scale mechanisms underlying void growth, as well as the interaction between twin boundaries and the void, are revealed in details.

twin boundaries; void; dislocations; strength; molecular dynamics simulations