Direct Observation of the Deformation Mechanism of Twin-Structured Ni NWs under Bending Strain
Zihao Zhang,
Chengpeng Yang,
Yizhong Guo,
Xueqiao Li,
Deli Kong,
Yan Lu,
Changjiang Nie,
Lihua Wang
Affiliations
Zihao Zhang
Beijing Key Laboratory of Microstructure and Property of Advanced Material, Department of Beijing University of Technology Materials and Manufacturing, Institute of Microstructure and Properties of Advanced Materials, Beijing 100124, China
Chengpeng Yang
Beijing Key Laboratory of Microstructure and Property of Advanced Material, Department of Beijing University of Technology Materials and Manufacturing, Institute of Microstructure and Properties of Advanced Materials, Beijing 100124, China
Yizhong Guo
Beijing Key Laboratory of Microstructure and Property of Advanced Material, Department of Beijing University of Technology Materials and Manufacturing, Institute of Microstructure and Properties of Advanced Materials, Beijing 100124, China
Xueqiao Li
Beijing Key Laboratory of Microstructure and Property of Advanced Material, Department of Beijing University of Technology Materials and Manufacturing, Institute of Microstructure and Properties of Advanced Materials, Beijing 100124, China
Deli Kong
Beijing Key Laboratory of Microstructure and Property of Advanced Material, Department of Beijing University of Technology Materials and Manufacturing, Institute of Microstructure and Properties of Advanced Materials, Beijing 100124, China
Yan Lu
Beijing Key Laboratory of Microstructure and Property of Advanced Material, Department of Beijing University of Technology Materials and Manufacturing, Institute of Microstructure and Properties of Advanced Materials, Beijing 100124, China
Changjiang Nie
School of Physics and Electronic Information Engineering, Hubei Engineering University, Xiaogan 432000, China
Lihua Wang
Beijing Key Laboratory of Microstructure and Property of Advanced Material, Department of Beijing University of Technology Materials and Manufacturing, Institute of Microstructure and Properties of Advanced Materials, Beijing 100124, China
In situ atomic-scale bending tests of twin-structured Ni nanowires were realised using a homemade deformation device. The results showed that the plastic deformation mechanism in twin-structured Ni nanowires depended on the deformation stage. At the early stages of bending deformation, the plasticity of twin-structured Ni nanowires was controlled by dislocations interacting with the twin boundaries or parallel to them. With increasing bending strain, both dislocation and face-centred cubic–body-centred tetragonal phase transition occurred. At very high bending strain, grain boundaries resulting from the lattice distortion/collapse were formed. This study details the deformation mechanisms of the twin-structured Ni nanowires under bending deformation, which advances the basic understanding of the plasticity mechanisms in metals.
