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When a material is subjected to an applied stress, the material willexperience recoverable elastic deformation followed by permanent plasticdeformation at the point when the applied stress exceeds the yield stress ofthe material. Microscopically, the onset of the plasticity usually indicatesthe activation of dislocation motion, which is considered to be the primarymechanism of plastic deformation. Once plastic deformation is initiated,further elastic deformation is negligible owing to the limited increase in theflow stress caused by work hardening. Here we present experimental evidence andquantitative analysis of simultaneous development of significant elasticdeformation and dislocation-based plastic deformation in single crystal GaAsnanowires (NWs) under bending deformation up to a total strain of ~ 6%. Theobservation is in sharp contrast to the previous notions regarding thedeformation modes. Most of the plastic deformation recovers spontaneously whenthe external stress is released, and therefore resembles an elastic deformationprocess.

Co-development of significant elastic and reversible plastic deformation in nanowires