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Chen, Jie; Zhang, Shengwang; Zhang, Yonghao; Zhang, Ji; Wen, Yuhua; Yang, Qin; Huang, Shuke; Wang, Xiebin
Intermetallics, December 2020, 2020-12-00, 20201201, Volume: 127Journal Article
In this work, we report a (Ni50.1Ti34.9Hf15)85Nb15 alloy that shows excellent cold workability and good high-temperature shape memory effect. The as-cast sample shows eutectic microstructure consisting of β-Nb and the NiTiHf(Nb) matrix. The homogenized (Ni50.1Ti34.9Hf15)85Nb15 alloy shows high compressive fracture strain of 40% and excellent cold-rolling reduction ratio of 80%. It is suggested that the formation of (semi-) coherent β-Nb is the main reason on improving the ductility of NiTiHf alloy. After solution treatment, the material shows a high martensitic transformation start temperature of 146 °C, and a maximum shape memory effect strain of 2.3%. This work demonstrates that (Ni50.1Ti34.9Hf15)85Nb15 alloy with good cold workability and high-temperature shape memory effect may provide new opportunities for applications. •Microstructure comprises (semi-) coherent β-Nb and NiTiHf(Nb) matrix is obtained.•Coherent β-Nb acts as nucleation and promotes martensitic transformation.•Compressive fracture strain 40% and cold-rolling reduction ratio 80% are obtained.•Martensitic transformation start temperature of 146 °C is obtained.•A maximum shape memory effect strain of 2.3% is achieved.
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