Direct Observation of the Deformation Mechanism of Twin-Structured Ni NWs under Bending Strain

In situ atomic-scale bending tests of twin-structured Ni nanowires were realised using a homemade deformation device. The results showed that the plastic mechanism in depended on stage. At early stages deformation, plasticity was controlled by dislocations interacting with twin boundaries or parallel to them. With increasing strain, both dislocation and face-centred cubic–body-centred tetragonal phase transition occurred. very high grain resulting from lattice distortion/collapse formed. This study details mechanisms under which advances basic understanding metals.