Deformation twin formed by self thickening, cross slip mechanism in nanocrystalline Ni
We report the observation of a deformation twin formed by a recently proposed self thickening, cross slip twinning mechanism. This observation verifies one more twinning mechanism, in addition to those reported before, in nanocrystalline face centered cubic metals. In this mechanism, once the first Shockley partial is emitted from a grain boundary, and cross slips onto another slip plane, a deformation twin could nucleate and grow in both the primary and cross slip planes without requiring the nucleation of additional Shockley partials from the grain boundary.