1. Large elastic strains and ductile necking of W nanowires embedded in TiNi matrix
- Author
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Yong Liu, Fangfeng Liu, Zhenghao Jia, Yang Ren, Lishan Cui, Daqiang Jiang, Hong Yang, and Xiaohua Jiang
- Subjects
Materials science ,Polymers and Plastics ,Mechanical Engineering ,Metals and Alloys ,Nanowire ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Microstructure ,01 natural sciences ,0104 chemical sciences ,Stress (mechanics) ,Mechanics of Materials ,Transmission electron microscopy ,Diffusionless transformation ,Ultimate tensile strength ,Materials Chemistry ,Ceramics and Composites ,Deformation (engineering) ,Composite material ,0210 nano-technology ,Necking - Abstract
The deformation behaviors of W nanowires embedded in a TiNi matrix were investigated by means of in-situ synchrotron high energy X-ray diffraction (HEXRD) and in-situ transmission electron microscopy (TEM) analysis during tensile deformation. The HEXRD measurement indicated that the W nanowires exhibited an average lattice strain of about 1.50 %, whereas the TEM examination revealed a local elastic strain of about 4.59 % in areas adjacent to the TiNi matrix where stress-induced martensitic transformation occurred. This strain corresponds to a stress of ∼15 GPa for the W nanowires. In addition, in areas adjacent to the TiNi matrix where plastic deformation and cracking were generated, the W nanowire showed significant ductile necking with ∼80 % reduction in cross-section area. The ductile necking of W nanowire is attributed to the lack of protection from the stress-induced martensitic transformation of the TiNi matrix.
- Published
- 2021