Effect of Ageing on Microsturcture, Tensile Properties, and Shape Memory Behaviors of Ti-50.8Ni-0.1Zr Shape Memory Alloy

doi:10.11900/0412.1961.2020.00276

Acta Metall Sin

2021, Vol. 57

Issue (6): 717-724 DOI: 10.11900/0412.1961.2020.00276

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Effect of Ageing on Microsturcture, Tensile Properties, and Shape Memory Behaviors of Ti-50.8Ni-0.1Zr Shape Memory Alloy

YE Junjie, HE Zhirong(

), ZHANG Kungang, DU Yuqing

School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723001, China

Cite this article:

YE Junjie, HE Zhirong, ZHANG Kungang, DU Yuqing. Effect of Ageing on Microsturcture, Tensile Properties, and Shape Memory Behaviors of Ti-50.8Ni-0.1Zr Shape Memory Alloy. Acta Metall Sin, 2021, 57(6): 717-724.

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Abstract

To improve the properties of Ti-Ni shape memory alloys (SMAs), a third element can be added to them and assisted by a heat treatment process. After the Ni-rich Ti-Ni SMAs are doped with a small amount of Zr, the parent phase of the alloy is observed to exhibit enhanced stability; further, the alloys exhibit improved yield strength, elongation, and memory performance. The effects of the composition and annealing processes on the phase transformation behaviors and mechanical properties of the Ti-Ni-Zr SMAs have been studied; however, the microstructure, tensile properties, and shape memory behaviors of the aged Ti-Ni-Zr SMAs remain to be investigated. In this work, a Ni-rich Ti-50.8Ni-0.1Zr alloy could be obtained by doping the Ti-Ni alloys with 0.1%Zr (atomic fraction). The effects of the ageing processes on the microstructure, tensile properties, and shape memory behaviors of the alloy were investigated through TEM and tensile tests. The Ti₃Ni₄ precipitates in the Ti-50.8Ni-0.1Zr alloy samples aged at 300, 400, and 500^oC exhibit morphologies of fine particles, lenticular particles, and long strips, respectively. The effect of ageing temperature on the morphology, size, and dispersion of precipitates is greater than that of the ageing time. The alloy exhibited enhanced strength but reduced ductility after the ageing treatment. With the increasing ageing time (t_ag), the tensile strength (R_m) increased and the percentage elongation (A) decreased when considering the alloy sample aged at 300^oC. In case of the alloy sample aged at 400^oC, R_m initially increased and subsequently decreased, whereas A initially decreased and subsequently increased. The alloy sample aged at 500^oC exhibited a reduced R_m but an enhanced A. The alloy samples aged at 300^oC for 1-50 h or at 400^oC for 1 h exhibited superelasticity, whereas those aged at 400^oC for 5-50 h or 500^oC for 1-50 h exhibited the shape memory effect. In the alloy samples aged at 300^oC, higher t_ag values resulted in enhanced energy dissipation and lower critical stress values for stress-induced martensite transformation. Alloy ageing at 400^oC or 500^oC resulted in lower critical stress values for martensite reorientation and lower energy dissipation.

Key words: Ti-50.8Ni-0.1Zr alloy shape memory alloy ageing microstructure shape memory behavior

Received: 23 July 2020

ZTFLH:

TG113.25

Fund: National Key Research and Development Program of China(2016YFE0111400)

About author: HE Zhirong, professor, Tel: 13892611307, E-mail: hezhirong01@163.com

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	Junjie YE
	Zhirong HE
	Kungang ZHANG
	Yuqing DU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00276 OR https://www.ams.org.cn/EN/Y2021/V57/I6/717

Fig.1 TEM images of Ti-50.8Ni-0.1Zr shape memory alloys aged at 300^oC for 10 h (a); at 400^oC for 1 h (b), 5 h (c), 10 h (d), 20 h (e), and 50 h (f); and at 500^oC for 10 h (g)

Fig.2 Tensile curves of Ti-50.8Ni-0.1Zr alloys aged at 300^oC (a), 400^oC (b), and 500^oC (c) for 1-50 h, respectively (800^oC, 0.5 h solid-solution treated sample is also shown in Fig.2c)

Fig.3 Effects of ageing temperature and ageing time (t_ag) on tensile strength (R_m) (a) and elongation (A) (b) of Ti-50.8Ni-0.1Zr alloys

Fig.4 Effects of ageing temperature and ageing time on shape memory behaviors of Ti-50.8Ni-0.1Zr alloys aged at 300^oC (a), 400^oC (b), and 500^oC (c) for 1-50 h, respectively (Insets show the zigzag stress fluctuations caused by twinning)

Fig.5 Effects of ageing temperature and ageing time on platform stress (σ_M) (a), residual strain (ε_R) (b), and energy dissipation (ΔW) (c) in stress-strain curves of Ti-50.8Ni-0.1Zr alloys

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