Microstructures and Mechanical Properties of Ti-Nb-Zr Alloys with Low Electron-to-Atom Ratio

doi:10.11901/1005.3093.2018.436

Chinese Journal of Materials Research

2019, Vol. 33

Issue (1): 27-33 DOI: 10.11901/1005.3093.2018.436

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Microstructures and Mechanical Properties of Ti-Nb-Zr Alloys with Low Electron-to-Atom Ratio

Honglei ZHOU¹,Fengqi HOU^2,³,Yulin HAO³(

)

1. College of Physics, Jilin University, Changchun 130012, China
2. Western Superconducting Technologies Co., Ltd., Xi'an 710021, China
3. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

Honglei ZHOU,Fengqi HOU,Yulin HAO. Microstructures and Mechanical Properties of Ti-Nb-Zr Alloys with Low Electron-to-Atom Ratio. Chinese Journal of Materials Research, 2019, 33(1): 27-33.

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Abstract

The microstructure and mechanical property were investigated for Ti-Nb-Zr Ti-alloys with varying contents of (24~30)Nb and (8~12 mass fraction%)Zr. The results show that the increase of Nb- and Zr-content is favorable for suppressing α" martensite- and ω phase- formation, while the alloys composed of single β phase can be obtained as their electron-to-atom ratio higher than about 4.19, which is much less than the ratio 4.24 for Ti-Nb binary alloys. The Ti-30Nb-(8~12)Zr alloys of single β phase exhibit low Young's modulus of about 62 GPa and high strength-to-modulus of about 0.9%, which imply that these alloys possess superior biomechanical compatibility rather than Ti-Nb binary alloys.

Key words: metallic materials Ti-Nb-Zr alloy microstructure phase transformation elastic modulus strength

Received: 05 July 2018

ZTFLH:

TG146.2

Fund: National Natural Science Foundation of China(51071152)

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	Yulin HAO

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.436 OR https://www.cjmr.org/EN/Y2019/V33/I1/27

Table 1 The nominal compositions and their e/a ratios of Ti-Nb-Zr alloys

Fig.1 Optical microstructures of the solution treated Ti-xNb-10Zr alloys: x=24 (a), 26 (b), 28 (c), 30 (d)

Fig.2 XRD profiles of the solution treated Ti-xNb-12Zr alloys: (1) x=24, (2) x=26, (3) x=28, (4) x=30

Fig.3 X-ray diffraction profiles of the solution treated Ti-28Nb-xZr alloys: (1) x=8, (2) x=10, (3) x=12

Fig.4 TEM morphology of the solution-treated Ti-26Nb-8Zr (a, b) and Ti-26Nb-12Zr (c, d) alloys

Fig.5 TEM morphology and diffraction patterns of the solution-treated Ti-28Nb-8Zr (a) and Ti-28Nb-10Zr (b) alloys

Table 2 Phase constitutions of the solution-treated Ti-Nb-Zr alloys

Fig.6 Stress displacement curves of the solution-treated Ti-(24-30)Nb-(8-12)Zr alloys: (a) Ti-24Nb-xZr; (b) Ti-26Nb-xZr; (c) Ti-28Nb-xZr; (d) Ti-30Nb-xZr

Fig.7 Tensile strength (a) , Young's modulus (b) and strength-modulus ratio (c) of the solution-treated Ti-Nb-Zr alloys: (1) Ti-24Nb-xZr；(2) Ti-26Nb-xZr；(3) Ti-28Nb-xZr；(4) Ti-30Nb-xZr

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