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Title: Large elastic strains and ductile necking of W nanowires embedded in TiNi matrix

Journal Article · · Journal of Materials Science and Technology
 [1];  [1];  [2];  [2];  [1];  [3];  [4];  [1]
  1. China Univ. of Petroleum-Beijing, Changping (China)
  2. Univ. of Western Australia, Perth, WA (Australia)
  3. China Univ. of Petroleum-Beijing, Changping (China); China Univ. of Petroleum Beijing (China)
  4. 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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