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Title: Anomalous expansion of Nb nanowires in a NiTi matrix under high pressure

Under high pressure, materials usually shrink during compression as described by an equation of state. Here, we present the anomalous volume expansion behavior of a one-dimensional Nb nanowire embedded in a NiTi transforming matrix, while the matrix undergoes a pressure-induced martensitic transformation. The Nb volume expansion depends on the NiTi transition pressure range from the matrix, which is controlled by the shear strain induced by different pressure transmitting media. The transformation-induced interfacial stresses between Nb and NiTi may play a major role in this anomaly. In conclusion, our discovery sheds new light on the nano-interfacial effect on mechanical anomalies in heterogeneous systems during a pressure-induced phase transition.
ORCiD logo [1] ;  [2] ;  [3] ;  [3] ;  [4]
  1. China Univ. of Petroleum-Beijing, Beijing (China); Chinese Academy of Sciences (CAS), Shanghai (China)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. China Univ. of Petroleum-Beijing, Beijing (China)
  4. Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (People's Republic of China); Carnegie Inst. of Washington, Argonne, IL (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357; FG02-94ER14466; FG02-99ER45775; NA0001974; EAR-1128799
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 109; Journal Issue: 16; Journal ID: ISSN 0003-6951
American Institute of Physics (AIP)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
National Natural Science Foundation of China (NNSFC); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Scientific User Facilities Division
Country of Publication:
United States
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1420536