Asymmetric deformation in fatigue of body-centered-cubic single crystals

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Abstract
Asymmetric deformation, the movement of material on single‐crystal surfaces in only one crystallographic direction under net zero strain cycle deformation, has been observed in single crystals of iron, niobium, and molybdenum. The effect leads to rapid local deformation and rapid fatigue failure. A dislocation mechanism involving asymmetric slip on {112} and {123} planes and repeated cross slip is proposed to explain the effect.