Temperature-dependence of superelastic stress in nanocrystalline NiTi with complete transformation capability
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Article number | 106970 |
Journal / Publication | Intermetallics |
Volume | 127 |
Online published | 1 Oct 2020 |
Publication status | Published - Dec 2020 |
Externally published | Yes |
Link(s)
DOI | DOI |
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Document Link | |
Link to Scopus | https://www.scopus.com/record/display.uri?eid=2-s2.0-85091996780&origin=recordpage |
Permanent Link | https://scholars.cityu.edu.hk/en/publications/publication(6672aba2-25d5-4807-a4d6-3038c055b601).html |
Abstract
Nanocrystalline (NC) NiTi were previously reported to obtain non-hysteretic superelasticity and nearly zero temperature-dependence of superelastic stresses. However, the influence of the non-transforming regions in the specimens was not ruled out. In this study, we fabricate NC NiTi specimens with grain size down to 15 nm by wire drawing and annealing. Our specimens have no detectable non-transforming regions and thus are of complete transformation capability. We demonstrate that the hysteretic superelasticity is observed in all specimens of different grain sizes and that the minimum temperature-dependence of superelastic stresses is 4.7 MPa/K. Possible reasons for the discrepancy have been discussed.
Research Area(s)
- Martensitic transformation, Nanocrystalline, NiTi, Shape memory alloys, Temperature-dependence
Citation Format(s)
Temperature-dependence of superelastic stress in nanocrystalline NiTi with complete transformation capability. / Wang, T.; Ma, Z.; Rao, X. et al.
In: Intermetallics, Vol. 127, 106970, 12.2020.
In: Intermetallics, Vol. 127, 106970, 12.2020.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review