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<p>This work developed the hypoeutectic, eutectic and hypereutectic NiTiHf-Sn alloys comprising NiTiHf matrix and intermetallic Ti<sub>3</sub>Sn phase. Martensitic transformation, shape memory effect (SME) and superelastic behavior of these alloys are investigated. It is found that all the samples undergo two-stage B2 ↔ B19′ transformation. The compressive strength and recoverable strain are both enhanced as a result of the formation of eutectic structure. The obtained maximum SME strain is 2.47% obtained for 6 at.% Sn content. Meanwhile, the maximum recoverable strains reach 7.21% (6 at.% Sn) at 25&#xa0;°C and 4.76% (8 at.% Sn) at 250&#xa0;°C.</p> Graphical abstract <p></p>

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Microstructure, thermal and mechanical properties of novel NiTiHf-Sn eutectic high-temperature shape memory alloys

  • 期刊论文

  • 发表日期：

    2025年11月24日

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  • Xiangguang Kong,
  • Jiaqi Zhang,
  • Shaokun Liu,
  • Haimin Ding,
  • Qing Liu,
  • Jiyu Zhou,
  • Fugong Qi,
  • Pengjie Wang

摘要

This work developed the hypoeutectic, eutectic and hypereutectic NiTiHf-Sn alloys comprising NiTiHf matrix and intermetallic Ti3Sn phase. Martensitic transformation, shape memory effect (SME) and superelastic behavior of these alloys are investigated. It is found that all the samples undergo two-stage B2 ↔ B19′ transformation. The compressive strength and recoverable strain are both enhanced as a result of the formation of eutectic structure. The obtained maximum SME strain is 2.47% obtained for 6 at.% Sn content. Meanwhile, the maximum recoverable strains reach 7.21% (6 at.% Sn) at 25 °C and 4.76% (8 at.% Sn) at 250 °C.

Graphical abstract