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<p>This study is a comparative investigation on the structures of temperature-induced and stress-induced R phase in a Ti<sub>50</sub>Ni<sub>48</sub>Fe<sub>2</sub> alloy by means of in situ X-ray. It is found that the thermally induced transformation proceeds in two distinct stages: an initial first-order transition, characterized by a sudden increase in both lattice distortion and atomic shuffle, followed by a second stage wherein these parameters increase continuously with lowering the temperature. In comparison, the structure of the stress-induced R phase remains unchanged with increasing stress. A direct comparison reveals that the structural parameters, i.e., lattice distortion and atomic shuffle, of the stress-induced R phase correspond closely to those of the thermally formed R phase at the testing temperature.</p>

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A Comparative Study of the Structure of Temperature-Induced and Stress-Induced R Phase in a Ti50Ni48Fe2 Alloy

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Yuxuan Chen,
  • Yingmin Gao,
  • Xinyan Wang,
  • Zikai Zhou,
  • Jianwen Wang,
  • Huimin Xu,
  • Xuan Liu,
  • Yipin Gao,
  • Lei Zhang,
  • Xiaobin Shi,
  • Junsong Zhang

摘要

This study is a comparative investigation on the structures of temperature-induced and stress-induced R phase in a Ti50Ni48Fe2 alloy by means of in situ X-ray. It is found that the thermally induced transformation proceeds in two distinct stages: an initial first-order transition, characterized by a sudden increase in both lattice distortion and atomic shuffle, followed by a second stage wherein these parameters increase continuously with lowering the temperature. In comparison, the structure of the stress-induced R phase remains unchanged with increasing stress. A direct comparison reveals that the structural parameters, i.e., lattice distortion and atomic shuffle, of the stress-induced R phase correspond closely to those of the thermally formed R phase at the testing temperature.