Modification of BCC phase and the enhanced reversible hydrogen storage properties of Ti-V-Fe-Mn alloys with varied V/Fe ratios  

作　　者：Xiang-feng Ma Xin Ding En-lai Liu Rui-run Chen Xin-xiu Wang Yong Zhang Jing-jie Guo 

机构地区：[1]National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,Harbin 150001,China [2]School of Materials Science and Engineering,Shandong University of Science and Technology,Qingdao 266500,Shandong,China [3]AECC,Harbin Dongan Engine Co.,Ltd.,Harbin 150001,China

出　　处：《China Foundry》2024年第5期546-554,共9页中国铸造（英文版）

基　　金：supported by the National Key Research and Development Program of China(2023YFB4005401);the National Natural Science Foundation of China(52425401,52204386);the Natural Science Foundation of Heilongjiang Province(JQ2023E003).

摘　　要：Ti-V-based alloys are proved of huge potential in storing hydrogen,but the incomplete reversible hydrogen storage capacity caused by overstability of V hydride has limited the large-scale application.In this study,Ti_(32)V_(40+x)Fe_(23-x)Mn_(5)(x=0,4,8,12,at.%)alloys were designed,and the effects of V/Fe ratio on phase constitution and hydrogen storage properties were investigated.The main phase of the alloys is body-centered cubic(BCC)phase,and the lattice constants of the BCC phase decrease with the decrease of V/Fe ratio.Moreover,C14 Laves phase exists in alloys with a Fe content of 19at.%to 23at.%.For hydrogenation,the C14 Laves phase can accelerate the hydrogen absorption rate,but the hydrogen absorption capacity is reduced.With the decrease of V/Fe ratio,the hydride gradually destabilizes.Owing to its large lattice constant and high hydrogen absorption phase content,the Ti_(32)V_(52)Fe_(11)Mn_(5)alloy shows the most enhanced hydrogen storage properties with hydrogenation and dehydrogenation capacities of 3.588wt.%at 298 K and 1.688wt.%at 343 K,respectively.The hydrogen absorption capacity of this alloy can be reserved to 3.574wt.%after 20 cycles of hydrogen absorption and desorption.

关 键 词：hydrogen storage Ti-based alloy lattice constant BCC phase 

分 类 号：TG146.23[一般工业技术—材料科学与工程]