Temperature-dependence of superelastic stress in nanocrystalline NiTi with complete transformation capability

T. Wang; Z. Ma; X. Rao; D. Jiang; Y. Ren; Y. Liu; K.Y. Yu; L. Cui

doi:10.1016/j.intermet.2020.106970

Author(s)

T. Wang
Z. Ma
X. Rao
D. Jiang
Y. Liu
K.Y. Yu
L. Cui

Detail(s)

Original language	English
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 https://doi.org/10.1016/j.intermet.2020.106970 Final Published version
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Document Link	Links https://www.sciencedirect.com/science/article/am/pii/S0966979520308748 Post-print
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)

[ RIS ] [ BibTeX ]

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.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review

Wang, T, Ma, Z, Rao, X, Jiang, D, Ren, Y, Liu, Y, Yu, KY & Cui, L 2020, 'Temperature-dependence of superelastic stress in nanocrystalline NiTi with complete transformation capability', Intermetallics, vol. 127, 106970. https://doi.org/10.1016/j.intermet.2020.106970

Wang, T., Ma, Z., Rao, X., Jiang, D., Ren, Y., Liu, Y., Yu, K. Y., & Cui, L. (2020). Temperature-dependence of superelastic stress in nanocrystalline NiTi with complete transformation capability. Intermetallics, 127, Article 106970. Advance online publication. https://doi.org/10.1016/j.intermet.2020.106970

Wang T, Ma Z, Rao X, Jiang D, Ren Y, Liu Y et al. Temperature-dependence of superelastic stress in nanocrystalline NiTi with complete transformation capability. Intermetallics. 2020 Dec;127:106970. Epub 2020 Oct 1. doi: 10.1016/j.intermet.2020.106970

Wang, T. ; Ma, Z. ; Rao, X. et al. / Temperature-dependence of superelastic stress in nanocrystalline NiTi with complete transformation capability. In: Intermetallics. 2020 ; Vol. 127.