Large elastic strains and ductile necking of W nanowires embedded in TiNi matrix
- China Univ. of Petroleum-Beijing, Changping (China)
- Univ. of Western Australia, Perth, WA (Australia)
- China Univ. of Petroleum-Beijing, Changping (China); China Univ. of Petroleum Beijing (China)
- Argonne National Lab. (ANL), Lemont, IL (United States)
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. In conclusion, the ductile necking of W nanowire is attributed to the lack of protection from the stress-induced martensitic transformation of the TiNi matrix.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; Australian Research Council
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1784913
- Journal Information:
- Journal of Materials Science and Technology, Vol. 60; ISSN 1005-0302
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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