V-Ti-Fe三元合金显微组织、氢传输行为及耐蚀性能研究

doi:10.11896/cldb.22110007

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Abstract Nb-Ti-Fe duplex alloys have been proven to have excellent hydrogen permeability, which are also expected to become a hydrogen permeable material to replace traditional Pd films. V and Nb belong to the same 5B group, with similar physical and chemical properties. However, the microstructure and hydrogen permeability changes of V-Ti-Fe have not been studied so far. Based on this, studying in detailed the microstructure and hydrogen transportation behavior of V-Ti-Fe ternary alloys, and the possibility of heat treatment and electrochemical corrosion for improving hydrogen permeability are explored. The results show that there is a quasiperitectic solidification reaction in the V-Ti-Fe ternary alloy system, determined as L+TiFe₂→V+TiFe (1 626 K). There are three phase regions in the liquid phase projection surface, containing of the TiFe phase region, the TiFe₂ phase region and the Bcc-(V, Ti) phase region. Among them, the room temperature structure of the TiFe phase alloy is composed of the primary TiFe phase and the {Bcc-(V, Ti)+TiFe} eutectic structure, the room temperature structure of the TiFe₂ phase alloy is composed of the primary TiFe phase, TiFe₂ phase and Bcc-(V, Ti) phase, and the room temperature structure of the Bcc-(V, Ti) phase alloy is composed of the primary Bcc-(V, Ti) phase and TiFe phase. Hydrogen permeability test confirmed that the alloy system has weak hydrogen embrittlement resistance. Specifically, the internal cast alloy in the above three regions has undergone different degrees of crushing during the hydrogen permeation experiment, and only the V_2.5Ti_62.5Fe₃₅ alloy can permeate hydrogen, but the alloy breaks during the hydrogen permeation process. Finally, the hydrogen permeability of the alloy system is improved by two methods, electrochemical corrosion and vacuum heat treatment. Of these alloys, V_2.5Ti_62.5Fe₃₅ alloy not only has high corrosion resistance, but also possesses excellent hydrogen permeability after heat treatment, and its hydrogen permeability is 1.03×10^-9 mol H₂ m^-1·s^-1·Pa^-0.5 at 623 K.

Key words： V-Ti-Fe alloy microstructure heat treatment corrosion resistance hydrogen permeability performance

Published: 25 April 2024 Online: 2024-04-28

CLC number:

TG139

Fund:National Natural Science Foundation of China (52161034, 51761009, U20A20237), Guangxi Natural Science Foundation (2020GXNSFAA159163, 2021GXNSFBA075057), Guangxi Bagui Scholars Young Top-notch Talent Fund, the Innovation Project of GUET Gra-duate Education (2023YCX155), and the Guangxi Key Laboratory of Information Materials (211012-Z).

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	Articles by authors
	MA Dongshuai
	YAN Erhu
	BAI Jinwang
	WANG Hao
	ZHANG Shuo
	WANG Yihao
	LI Tangwei
	GUO Zhijie
	ZHOU Zirui
	ZOU Yongjin
	SUN Lixian

Cite this article:

MA Dongshuai,YAN Erhu,BAI Jinwang, et al. Study on Microstructure, Hydrogen Transportation Behavior and Corrosion Resistance of V-Ti-Fe Alloy[J]. Materials Reports, 2024, 38(8): 22110007-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22110007 OR http://www.mater-rep.com/EN/Y2024/V38/I8/22110007

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