Large elastic strains and ductile necking of W nanowires embedded in TiNi matrix
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第1期
论文作者：Daqiang Jiang Zhenghao Jia Hong Yang Yinong Liu Fangfeng Liu Xiaohua Jiang Yang Ren Lishan Cui
文章页码：56 - 60
摘 要：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 transfo rmation 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.
Daqiang Jiang1，Zhenghao Jia1，Hong Yang2，Yinong Liu2，Fangfeng Liu1，Xiaohua Jiang1,3，Yang Ren4，Lishan Cui1
1. Department of Materials Science and Engineering, China University of Petroleum-Beijing2. Department of Mechanical Engineering, The University of Western Australia3. Beijing Key Laboratory of Failure, Corrosion, and Protection of Oil/Gas Facilities, China University of Petroleum Beijing4. X-ray Science Division, Argonne National Laboratory
摘 要：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 transfo rmation 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.
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