Effect of Ti on β Structural Stability and Mechanical Properties of Zr-Nb Binary Alloys

doi:10.11900/0412.1961.2020.00125

Acta Metall Sin

2021, Vol. 57

Issue (1): 95-102 DOI: 10.11900/0412.1961.2020.00125

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Effect of Ti on β Structural Stability and Mechanical Properties of Zr-Nb Binary Alloys

WANG Mingkang¹, YUAN Junhao¹, LIU Yufeng², WANG Qing¹(

), DONG Chuang¹, ZHANG Zhongwei³

^1.Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
^2.Science and Technology of Advanced Functional Composites Laboratory, Aerospace Research Institute of Materials and Processing Technology, Beijing 100076, China
^3.Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China

Cite this article:

WANG Mingkang, YUAN Junhao, LIU Yufeng, WANG Qing, DONG Chuang, ZHANG Zhongwei. Effect of Ti on β Structural Stability and Mechanical Properties of Zr-Nb Binary Alloys. Acta Metall Sin, 2021, 57(1): 95-102.

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Abstract

Metastable bcc β-Zr alloys generally have low elastic modulus, magnetic susceptibility, good mechanical properties, corrosion resistance, and biocompatibility, which are ascribed to co-alloying of multiple elements to enhance the structural stability of the bcc-β phase. This work systematically investigated the effects of Nb and Ti elements on the structural stability of the bcc-β phase and mechanical properties of Zr-Nb-Ti alloys. Various binary [Zr-Zr₁₄](Zr, Nb)₃ alloy compositions were designed by the cluster formula approach, based on which Ti was substituted for the base Zr to form ternary alloys. Alloy rods were prepared by the copper-mold suction-cast method with vacuum protection. The microstructure and mechanical properties of the alloys were characterized using XRD, OM, and TEM etc. The results show that the crystal structures of the Zr-Nb binary alloys could change from hcp-α to bcc-β with increasing Nb content, whereas, the ω-phase always coexists with the β-phase. An appropriate amount of Ti addition can significantly inhibit the precipitation of ω, resulting in the further improvement of the stability of the β-phase. The single β-[Ti-Zr₁₄]Nb₃ (Zr-17.37Nb-2.98Ti, mass fraction, %) ternary alloy exhibited not only a low elastic modulus of E=57 GPa but also a good tensile property with a high yield strength of σ_YS=557 MPa and an elongation of δ=15.5%.

Key words: Zr-Nb-Ti alloy structural stability cluster formula approach elastic modulus mechanical property

Received: 20 April 2020

ZTFLH:

TG146.414

Fund: National Key Research and Development Program of China(2017YFB0702401);National Natural Science Foundation of China(91860108);Natural Science Foundation of Liaoning Province of China(2019-KF-05-01)

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	Mingkang WANG
	Junhao YUAN
	Yufeng LIU
	Qing WANG
	Chuang DONG
	Zhongwei ZHANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00125 OR https://www.ams.org.cn/EN/Y2021/V57/I1/95

Fig.1 XRD spectra (a) and OM images of typical alloys N1 (b) and N3 (c)

Fig.2 TEM bright-field (BF) (a1, b1) and dark-field (DF) (a2, b2, c, d) images and the corresponding SAED patterns (insets) of [Zr-Zr₁₄](Zr, Nb)₃ series of alloys N1 (a1, a2), N2 (b1, b2), N3 (c), and Zr-19.2Nb (d)

Fig.3 TEM BF and DF images and SAED patterns (insets) of [Ti-Zr₁₄](Ti, Nb)₃ series of alloys TN3 (a) and T1N2 (b)

Fig.4 Engineering tensile stress-strain curves of series of alloys

Table 1 Mechanical properties and phase constitution of the designed series of alloys

Fig.5 The variations of elastic modulus (a), and microhardness, strength, as well as elongation to fracture (b) with the Nb_eq and phase constitution of series of alloys

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