Differences in deformation processes in nanocrystalline nickel with low- and high-angle boundaries from atomistic simulations

Caturla, M.-J.; Nieh, T. G.; Stolken, J. S.
January 2004
Applied Physics Letters;1/26/2004, Vol. 84 Issue 4, p598
Academic Journal
Molecular dynamics simulations show significant differences in the deformation mechanisms of nanocrystalline nickel with low- and high-angle boundaries. For the case studied with average grain size of 12 nm, low-angle boundaries present enhanced dislocation activity and reduced strength with respect to high-angle boundaries for low strains. In the latter, most of the deformation is accommodated at the grain boundaries with limited dislocation activity, while in the case of low-angle boundaries, most of the displacements observed are associated with the motion of partial dislocations nucleated at the grain boundaries. © 2004 American Institute of Physics.


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