Nb-Ti-Fe渗氢合金成分优化设计和氢传输性能研究

doi:10.11896/cldb.21060218

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Abstract Currently, the development of alloy membrane materials with cheap and excellent hydrogen permeability around ⅤB group metals (Nb, V and Ta) and their alloys has become a hot research topic. Hence, the Nb-Ti-Fe hydrogen permeation alloy system was studied in detail in this work, especially Nb₁₀Ti_50+xFe_40-x and Nb₁₅Ti_45+xFe_40-x(x=0, 5, 10) alloys. Firstly, the microstructure characteristics were analyzed by SEM, EDS and XRD. Based on this, the hydrogen transport property of these alloys, such as hydrogen permeability, hydrogen diffusivity and hydrogen solubility, were measured using the hydrogen permeability tester and the Devanathan-Stachurski electrolytic cell. Finally, the intrinsic relationship among alloy composition, microstructure and hydrogen transport property was clarified. The results show that the six Nb-Ti-Fe ternary alloys all exhibit the characteristics of dual-phase structure, consisting of TiFe phase and α-Nb phase, although the individual component contains a small amount of NbFe phase. Furthermore, as the Ti/Fe ratio increases (i.e., x value↑), the volume fraction of the eutectic phase increases. On the contrary, the content of the primary TiFe phase decreases. With the above changes, the hydrogen permeability gradually increases, but the hydrogen embrittlement resistance becomes poor. The above results further confirm that the primary TiFe phase and the eutectic phase in the microstructure play the role of hydrogen embrittlement resistance, while the α-Nb phase mainly contributes to hydrogen permeability. The Nb₁₀Ti₅₅-Fe₃₅ alloy exhibits the optimal hydrogen permeability at 673 K, i.e., its hydrogen permeability coefficient is 3.28×10^-8 mol H₂ m^-1·s^-1·Pa^-1/2, which is 2.1 times than that of pure Pd, and also far better than that of the Nb₁₂Ti₅₂Fe₃₆ (2.9×10^-8 mol H₂ m^-1·s^-1·Pa^-1/2) reported in the literature. This work proves that the microstructure of alloys can be adjusted through the composition optimization design, so as to obtain Nb-Ti-Fe hydrogen permeation alloy with good comprehensive properties.

Key words： Nb-Ti-Fe alloys microstructure hydrogen permeability hydrogen diffusion property

Received: 25 September 2022 Published: 25 September 2022 Online: 2022-09-26

CLC number:

TG139

Fund:The National Natural Science Foundation of China (52161034, 51761009, U20A20237, 51863005, 51462006, 51102230, 52101245, 51871065, 51971068), Guangxi Natural Science Foundation (2020GXNSFAA159163, 2021GXNSFBA075057), Guangxi Bagui Scholar Foundation，ChinesischDeutsche Kooperationsgruppe (GZ1528), the Scientific Research and Technology Development Program of Guangxi (AA19182014, AD17195073, AA17202030-1, AB21220027), the Innovation Project of Guet Graduate Education (2019YCXS109) and the Guangxi Key Laboratory of Information Materials (211012-Z).

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	Articles by authors
	GE Xiaoyu
	YAN Erhu
	CHEN Yuncan
	HUANG Renjun
	CHENG Jian
	WANG Hao
	LIU Wei
	CHU Hailiang
	ZOU Yongjin
	XU Fen
	SUN Lixian

Cite this article:

GE Xiaoyu,YAN Erhu,CHEN Yuncan, et al. Composition Optimization Design and Hydrogen Transport Property of Nb-Ti-Fe Hydrogen Permeation Alloys[J]. Materials Reports, 2022, 36(18): 21060218-6.

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http://www.mater-rep.com/EN/10.11896/cldb.21060218 OR http://www.mater-rep.com/EN/Y2022/V36/I18/21060218

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