Study on a NiTiHfTa shape memory alloy with high-pressure torsion and subsequent annealing

Zhang, Jintao, Wang, Shibo, Zhang, Yu, Huang, Yi and university, northeastern (2023) Study on a NiTiHfTa shape memory alloy with high-pressure torsion and subsequent annealing. MMEAT 2023: 9th International Conference on Mechanical Engineering, Materials, and Automation Technology 9-11 June 2023 Dalian, China.. 6 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

An alloy with the composition of 49.6Ni-35.4Ti-9Hf-6Ta (at%) was processed by high-pressure torsion (HPT) and postHPT annealing treatment. The microhardness of HPT-processed samples increased obviously, and amorphous feature
appeared in 2 turns sample. The microhardness further increased and amorhozation was enhanced in 16 turns sample. After annealing at 750 ℃ for 3h, almost full crystallization occurs in 16 turns sample. In-situ high temperature X-ray diffraction experiment reveals that martensite to austenite transformation took place, indicating the alloy would exhibit SMA effect.

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MMEAT（2023-05-22)_YH - Accepted Manuscript

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Published date: June 2023

Venue - Dates: MMEAT 2023: 9th International Conference on Mechanical Engineering, Materials, and Automation Technology 9-11 June 2023 Dalian, China., 2023-06-09

Keywords: NiTiHfTa, shape memory alloy, high-pressure torsion, annealing