Molecular dynamics simulations had recently shown that the presence of grown-in twin boundaries in nanocrystalline Al promoted slip activity in the form of twin boundary migration. The effect of grown-in twin boundaries on the plastic deformation mechanism in nanocrystalline Ni and Cu was investigated here, and it was shown that, for these particular face-centered cubic metals, twin-boundary migration was not the favored deformation mechanism. Also, the Schmid factors of the grown-in twin plane played a correspondingly important role. The results were explained in terms of the differing ratios of the extrema of the generalized planar fault curves.

Grown-In Twin Boundaries Affecting Deformation Mechanisms in nc-Metals. A.G.Frøseth, P.M.Derlet, H.Van Swygenhoven: Applied Physics Letters, 2004, 85[24], 5863-5