Nb-Ti-Fe合金的组织和耐腐蚀性能及置氢前后的显微硬度研究

doi:10.11896/cldb.21070095

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Abstract Nb-Ti-Fe hydrogen filtration alloy membrane has been widely paid attention because of its high hydrogen permeability and low price. However, up to now, there are few reports on the corrosion resistance of the alloy film, and the relationship between the microstructure and corrosion resistance of the alloy has not been established. Based on this, the microstructure, corrosion resistance and microhardness of Nb-Ti-Fe hydrogen separation alloy before and after hydrogen treatment were studied in this work. The results show that:in the two groups of Nb₁₀Ti_50+xFe_40-x and Nb₁₅Ti_45+xFe_40-x (x=0, 5, 10, 15) alloys, the microstructure of the alloy is composed of primary α-Nb phase and eutectic (α-Nb+TiFe) phase when x<10, while the primary phase is phase TiFe when x＞10. When x=10, a small amount of primary α-Nb phase exists in Nb₁₀Ti₆₀Fe₃₀, but this phase disappears in Nb₁₅Ti₅₅Fe₃₀ alloy and is replaced by eutectic (α-Nb+TiFe) phase. Secondly, an extremely thin oxide covering layer is formed on the surface of the alloy after electrochemical corrosion, which is divided into Nb₂O₅, TiO₂, Nb₂C and Fe₂O₃. The corrosion performance is closely related to the type and composition of the phase. The corrosion resistance of Nb₁₀Ti₆₅Fe₂₅alloy (4#) is strong. The Nb₁₅Ti₄₅Fe₄₀ alloy (5#) with more FeNb has the lowest corrosion resistance. In addition, the hydrogen-loading properties of the alloys are gradually improved with the increase of Ti/Fe atomic ratio. On the other hand, the Vickers hardness values decrease first and then increase. The average hardness values of the alloys are distributed between 520HV—570HV. The microhardness values of each phase in the structure are eutectic (α-Nb+TiFe), TiFe, α-Nb, FeNb from small to large. The reason for the decrease in hardness of the alloy after hydrogen implantation is that the introduction of hydrogen atoms promotes dislocation proliferation and promotes double kink nucleation, resulting in internal defects.

Key words： Nb-Ti-Fe alloy microstructure corrosion resistance hydrogen placement microhardness

Published: 10 April 2023 Online: 2023-04-07

CLC number:

TG139

Fund:National Natural Science Foundation of China (52161034), National Key Research and Development Program of China (2018YFB1502103),Guangxi Natural Science Foundation (2019JJA160006),Innovation Project of Guet Graduate Education Program (2021YCXS155, 2019YCXS109), Guangxi Bagui Scholar Foundation,Chinesisch-Deutsche Kooperationsgruppe (GZ1528), Guangxi Key Laboratory of Information Laboratory (211012-Z).

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

Cite this article:

HUANG Renjun,YAN Erhu,CHEN Yuncan, et al. Microstructure and Corrosion Resistance of Nb-Ti-Fe Alloy and Its Microhardness Before and After Hydrogen Treatment[J]. Materials Reports, 2023, 37(7): 21070095-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21070095 OR http://www.mater-rep.com/EN/Y2023/V37/I7/21070095

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