(西北工業(yè)大學(xué) 凝固技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室，西安 710072)
摘 要: 采用SEM、EDS及XRD等分析手段研究Zr0.7Ti0.3V2合金的微觀組織及相結(jié)構(gòu)，通過(guò)定容法于673~823 K測(cè)試合金的吸氫性能。結(jié)果表明：合金吸氫前主要由C15型ZrV2相、α-Zr及具有BCC結(jié)構(gòu)的富V的固溶體相組成，吸氫后生成V16Zr8H36.29、ZrH1.801和VH2.01等3種氫化物；壓力−組成−溫度(PCT)曲線顯示，合金吸氫曲線具有較寬且平坦的平臺(tái)特征。BCC相改善了吸氫動(dòng)力學(xué)性能，HCP相使吸氫PCT曲線平臺(tái)寬化，合金的多相結(jié)構(gòu)有助于改善其吸氫性能。
關(guān)鍵字: Zr0.7Ti0.3V2合金；AB2型；多相結(jié)構(gòu)；吸氫動(dòng)力學(xué)；PCT曲線
（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
