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

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

Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

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.

Original language	English
Article number	106970
Journal	Intermetallics
Volume	127
DOIs	https://doi.org/10.1016/j.intermet.2020.106970
Publication status	Published - Dec 2020

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10.1016/j.intermet.2020.106970

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title = "Temperature-dependence of superelastic stress in nanocrystalline NiTi with complete transformation capability",

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.",

keywords = "Martensitic transformation, Nanocrystalline, NiTi, Shape memory alloys, Temperature-dependence",

author = "T. Wang and Z. Ma and X. Rao and D. Jiang and Y. Ren and Y. Liu and Yu, {K. Y.} and L. Cui",

year = "2020",

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language = "English",

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T1 - Temperature-dependence of superelastic stress in nanocrystalline NiTi with complete transformation capability

AU - Wang, T.

AU - Ma, Z.

AU - Rao, X.

AU - Jiang, D.

AU - Ren, Y.

AU - Liu, Y.

AU - Yu, K. Y.

AU - Cui, L.

PY - 2020/12

Y1 - 2020/12

N2 - 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.

AB - 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.

KW - Martensitic transformation

KW - Nanocrystalline

KW - NiTi

KW - Shape memory alloys

KW - Temperature-dependence

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U2 - 10.1016/j.intermet.2020.106970

DO - 10.1016/j.intermet.2020.106970

M3 - Article

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SN - 0966-9795

VL - 127

JO - Intermetallics

JF - Intermetallics

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

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Transformation Dual Phase Synergy for Unprecedented Superelasticity

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

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Transformation Dual Phase Synergy for Unprecedented Superelasticity

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