In-situ synchrotron high energy X-ray diffraction study of spontaneous reorientation of R phase upon cooling in nanocrystalline Ti50Ni45.5Fe4.5 alloy

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

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Author(s)

  • Zhi-Yuan Ma
  • Yu-Xuan Chen
  • Kai-Yuan Yu
  • Da-Qiang Jiang
  • Yi-Nong Liu
  • Li-Shan Cui

Detail(s)

Original languageEnglish
Pages (from-to)1948-1954
Journal / PublicationRare Metals
Volume41
Issue number6
Online published27 Mar 2022
Publication statusPublished - Jun 2022

Abstract

This study investigated a peculiar phenomenon of self-reorientation of thermally formed R phase in nanocrystalline Ti50Ni45.5Fe4.5 by means of in-situ synchrotron high energy X-ray diffraction (HE-XRD). Two samples with different average grain sizes of 40 and 90 nm were investigated. R phase in the 40-nm grain size sample was found to self-reorient gradually upon cooling, whereas the same phenomenon did not occur in the 90-nm grain size sample. This self-reorientation process is attributed to the development and evolution of an internal stress anisotropy caused by the second order continuous lattice distortion of R phase upon further cooling in the small nanograined matrix, which lacks the self-accommodation mechanism for internal stress cancellation. 

Research Area(s)

  • Martensitic transformation, Nanocrystalline material, R phase reorientation, Synchrotron diffraction, TiNiFe

Citation Format(s)

In-situ synchrotron high energy X-ray diffraction study of spontaneous reorientation of R phase upon cooling in nanocrystalline Ti50Ni45.5Fe4.5 alloy. / Ma, Zhi-Yuan; Chen, Yu-Xuan; Ren, Yang; Yu, Kai-Yuan; Jiang, Da-Qiang; Liu, Yi-Nong; Cui, Li-Shan.

In: Rare Metals, Vol. 41, No. 6, 06.2022, p. 1948-1954.

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