Negative temperature-dependence of stress-induced R→B19′ transformation in nanocrystalline NiTi alloy

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

3 Scopus Citations
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Author(s)

  • Taotao Wang
  • Xiangxiang Rao
  • Qiang Zhang
  • Daqiang Jiang
  • Lishan Cui
  • Kaiyuan Yu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)250-258
Journal / PublicationMaterials Research Letters
Volume11
Issue number4
Online published11 Nov 2022
Publication statusPublished - 2023

Link(s)

Abstract

The temperature dependence of the critical stress of R→B19’ transformation in NiTi shape memory alloys remains unclear due to the difficulties in precisely identifying the phase constitution and acquiring sole R phase. Here we investigate the thermally- and stress-induced martensitic transformation in a near-equiatomic nanocrystalline NiTi alloy. In situ synchrotron X-ray diffraction is used to identify the phase evolution such that the temperature window for sole R phase is firmly determined. We find that the temperature dependence of R→B19’ is negative (−0.2 MPa/K) in our alloy, in sharp contrast to 3–5 MPa/K reported. Possible reasons for the discrepancies are discussed.

Research Area(s)

  • martensitic transformation, NiTi, R phase, synchrotron XRD, temperature dependence

Citation Format(s)

Negative temperature-dependence of stress-induced R→B19′ transformation in nanocrystalline NiTi alloy. / Wang, Taotao; Rao, Xiangxiang; Zhang, Qiang et al.
In: Materials Research Letters, Vol. 11, No. 4, 2023, p. 250-258.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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