Journal
APPLIED PHYSICS LETTERS
Volume 95, Issue 3, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3187539
Keywords
deformation; dislocations; grain growth; grain size; nanostructured materials; twin boundaries
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Most deformation twins in nanocrystalline face-centered cubic (fcc) metals have been observed to form from grain boundaries. The growth of such twins requires the emission of Shockley partials from the grain boundary on successive slip planes. However, it is statistically improbable for a partial to exist on every slip plane. Here we propose a dislocation reaction and cross-slip mechanism on the grain boundary that would supply a partial on every successive slip plane for twin growth. This mechanism can also produce a twin with macrostrain smaller than that caused by a conventional twin.
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