Abstract
Nanoscale twin boundaries (TBs) were recently reported to be capable of enhancingthe fracture toughness of nanocrystalline (nc) metals. The present study aims toinvestigate the toughening effects of nanoscale TBs in nc Ni by using moleculardynamics (MD) simulation. It is shown that the presence of embedded nanoscaleTBs facilitates the accommodation of dislocations through partial dislocationmotion along TBs, resulting in improved fracture toughness. Moreover, crackpropagation is observed to be intragranular in a nanotwinned sample, concurrent withnucleation of nanovoids in the intersections of TBs and grain boundaries (GBs).
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