Nanocrystalline strain glass TiNiPt and its superelastic behavior
- China University of Petroleum, Beijing (China)
- Univ. of Western Australia, Perth, WA (Australia)
- Xi'an Jiaotong University, Xi'an (China); National Institute for Materials Science, Tsukuba (Japan)
- Argonne National Lab. (ANL), Argonne, IL (United States)
TiNi-based shape-memory alloys are known to exhibit a strain glass state under certain conditions, generally in the presence of high-density defects such as excess solute atoms or alloying elements, dislocations, and nanoprecipitates. In this paper, we report a strain glass transition in a nanocrystalline Ti50 Ni35 Pt15 alloy. The nanocrystalline strain glass state is achieved by a combined effect of high-density grain boundaries and high concentration doping of Pt atoms in the B2 matrix. The nanocrystalline Ti50 Ni35 Pt15 strain glass alloy showed a large near-complete progressive superelasticity with a recovery strain of about 6% and a low apparent Young's modulus of about 30 GPa in a wide temperature range of over 200 °C. In situ synchrotron x-ray diffraction measurement showed that the strain glass B2 [B2(SG)] phase experienced B2(SG)→R→B19 transformation upon loading and B19→B2(SG) upon unloading. The findings of this study provide insight for the development of nanocrystalline strain glass shape-memory alloys.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Natural Science Foundation of China (NSFC); Australian Research Council (ARC); USDOE Office of Science (SC)
- Grant/Contract Number:
- AC02-06CH11357; 51731010; 51831006; 5197124; DP180101955; DP190102990
- OSTI ID:
- 1813021
- Journal Information:
- Physical Review B, Vol. 104, Issue 2; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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