高温退火对V30Ti33Cr27Fe10贮氢合金性能与结构的影响

研究了高温退火处理对V30Ti33Cr27Fe10贮氢合金性能与结构的影响。结果表明高温退火使放氢平台变平，平台压降低，减小了合金吸放氢后的体胀，改变了合金晶粒的形态，改善了合金基体的组织均匀性。随保温时间延长，合金晶粒长大，晶胞体积减小，吸放氢量降低，BCC主相中析出越来越多的富Ti相，富Ti相中Fe含量随保温时间延长而减少。1523K保温30min的合金具有最大的室温吸放氢量，分别为3．679，5和2．14%（质量分数）；保温3h的合金具有最好的室温吸氢动力学性能，5min内就能达到其饱和吸氢量的80％。

Effects of annealing treatment on the properties and structures of V30Ti33Cr27Fe10 hydrogen storage alloys

Annealing treatment on the properties and structures of V30 Ti33 Cr27 Fe10 hydrogen storage alloys were investigated. After annealing treatment, the desorption plateau is flattened and the plateau pressure is decreased. Annealing treatment decreases the volume inflation and changes the shape of crystal grains, at the same time ,the composition homogeneity was enhanced. With increasing annealing time the grains grow up while the cell volume decreases and the hydrogen absorption and desorption capacities decrease. More and more second phases with much Ti appear in bcc phase and the content of Fe in the second phases decreases with increasing annealing time. The alloy annealed at 1523K for 30min has the largest hydrogen absorption and desorption capacities which are 3.67wt% and 2.14wt% respectively. The alloy annealed at 1523K for 3h has the best hydrogen absorption kinetics property at ambient temperature which could attain 80wt% of its largest hydrogen absorption capacity.