退火温度对Ti-50.8Ni-0.1Zr形状记忆合金丝记忆行为和力学性能的影响

doi:10.11896/cldb.19100010

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Abstract The effect of annealing temperature (T_a) on the shape memory effect, superelasticity, mechanical properties and fracture morphology of Ti-50.8Ni-0.1Zr alloy wire were investigated by tensile test, differential scanning calorimetry, optical microscope and scanning electron microscopy. The results are as follows. The alloy wires annealed at 350—400 ℃ and 600—700 ℃ present superelasticity (SE), the maximum value (483 MPa) of the platform stress and the minimum value (0.1%) of the residual strain are all obtained in the alloy wires annealed at 600 ℃, and the stability of SE in the alloy wires annealed at 350—400 ℃ is the best. The alloy wires annealed at 450—550 ℃ present shape memory effect (SME), the minimum value (190 MPa) of the platform stress is obtained in the alloy wire annealed at 500 ℃, and the maximum value (4.9%) of the residual strain is obtained in the alloy wire annealed at 450 ℃, and the stability of SME in the alloy wire annealed at 450 ℃ is the best. The plasticity of the alloy wires annealed at 600—700 ℃ is superior to the alloy wires annealed at 350—550 ℃, but the strength is less than that of the latter. The maximum value (1 489 MPa) of the tensile strength is obtained in the alloy wire annealed at 400 ℃, and the maximum value (35.1%) of the percentage elongation is obtained in the alloy wire annealed at 650 ℃. The fracture morphology of the alloy wire presents dimple, and su-bordinates to ductile fracture of the microporous aggregation. T_a has little effect on fracture morphology.

Key words： Ti-50.8Ni-0.1Zr alloy wire shape memory alloy annealing temperature shape memory effect superelasticity

Published: 23 February 2021

CLC number:

TG113.25

Fund:This work was financially supported by the National Program on Key Basic Research Project (2016YFE0111400).

Corresponding Authors: hezhirong01@163.com

About author:: Junjie Ye, male, master student, studying at Shaanxi University of Technology from 2019. His main research direction is shape memory alloys.
Zhirong He, received his B.S., M.S.,and Ph.D. degrees from Xi'an Jiaotong University in 1982, 1986, and 2004, respectively. He became a visiting scholar at University of Tsukuba, Tohoku University, University of Tsukuba in 1994, 2000, and 2006, respectively. Now he is a professor in School of Materials Science and Engineering, Shaanxi University of Technology. His research interests include heat treatment of metals, and shape memory alloys.

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Cite this article:

YE Junjie,HE Zhirong,ZHANG Kungang, et al. Effect of Annealing Temperature on Memory Behaviors and Mechanical Properties of Ti-50.8Ni-0.1Zr Shape Memory Alloy Wire[J]. Materials Reports, 2021, 35(4): 4118-4123.

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http://www.mater-rep.com/EN/10.11896/cldb.19100010 OR http://www.mater-rep.com/EN/Y2021/V35/I4/4118

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