(西北工业大学 凝固技术国家重点实验室，西安 710072)
摘 要: 采用SEM、EDS及XRD等分析手段研究Zr0.7Ti0.3V2合金的微观组织及相结构，通过定容法于673~823 K测试合金的吸氢性能。结果表明：合金吸氢前主要由C15型ZrV2相、α-Zr及具有BCC结构的富V的固溶体相组成，吸氢后生成V16Zr8H36.29、ZrH1.801和VH2.01等3种氢化物；压力−组成−温度(PCT)曲线显示，合金吸氢曲线具有较宽且平坦的平台特征。BCC相改善了吸氢动力学性能，HCP相使吸氢PCT曲线平台宽化，合金的多相结构有助于改善其吸氢性能。
关键字: Zr0.7Ti0.3V2合金；AB2型；多相结构；吸氢动力学；PCT曲线
（State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China）
Abstract:The microstructure and phase composition of Zr0.7Ti0.3V2 alloy were investigated by SEM, EDS and XRD, respectively. Hydrogen absorption pressure-composition-temperature (PCT) property of the alloy was investigated by pressure reduction method at temperature ranging from 673 K to 823 K. The results indicate the dominant phases of the annealed alloy can be ascribed to ZrV2 (C15 type), α-Zr and abundant V solid solution phases. After hydrogenation, the dominant phases can be ascribed to V16Zr8H36.29, ZrH1.801, and VH2.01 phases. The wider and flatter plateau region can be found in the hydrogen absorption PCT curves. The BCC phase is beneficial to the hydrogen absorption kinetics and the HCP phase can improve the hydrogenation PCT characteristic. The multiphase structures make the Zr0.7Ti0.3V2 alloy preserve excellent hydrogen absorption properties.
Key words: Zr0.7Ti0.3V2 alloy; AB2 type; multiphase structure; hydrogen absorption kinetics; PCT curve
