Compositional dependence of hydrogenation performance of Ti-Zr-Hf-Mo-Nb high-entropy alloys for hydrogen/tritium storage  

作　　者：Huahai Shen Jutao Hu Pengcheng Li Gang Huang Jianwei Zhang Jinchao Zhang Yiwu Mao Haiyan Xiao Xiaosong Zhou Xiaotao Zu Xinggui Long Shuming Peng 

机构地区：[1]Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,China [2]School of Physics,University of Electronic Science and Technology of China,Chengdu 610054,China

出　　处：《Journal of Materials Science & Technology》2020年第20期116-125,共10页材料科学技术（英文版）

基　　金：The author, Huahai Shen is grateful for support from the President’s Foundation of the China Academy of Engineering Physics(No.YZJJLX2018003);the National Natural Science Foundation of China(No.21601168);support from the Joint Funds of the National Natural Science Foundation of China(No.U1930120)。

摘　　要：A series of Ti-Zr-Hf-Mo-Nb high-entropy alloys with different Mo concentrations were developed as candidate materials for hydrogen/tritium storage in solid phase.The crystal structures and hydrogenation properties of the Ti-Zr-Hf-Mo-Nb alloys were investigated by X-ray diffraction and differential scanning calorimetry techniques.All the alloys have a body-centred cubic single phase structure.The results demonstrate that the cell volume of the Ti-Zr-Hf-Mo-Nb hydride decreases with increasing Mo concentration,which reduces their thermal stability.The theoretical calculation proposes that the lower binding energy of the Ti-Zr-Hf-Mo-Nb hydride decreases the thermal stability of Ti-Zr-Hf-Mo-Nb alloys with higher Mo content.The great hydrogenation performance for all the Ti-Zr-Hf-Mo-Nb alloys is owing to their reversible single-phase transformation during the hydrogen absorption-desorption cycle,which would be bene ficial to improving the hydrogen recycling rate and preventing the disproportionation.The compositional dependence of the hydrogenation performance of the Ti-Zr-Hf-Mo-Nb alloys was established and will be useful in designing novel hydrogen/tritium storage materials to satisfy the requirements of diffe rent application fields in hydrogen,solar thermal and nuclear energy.

关 键 词：High-entropy alloy Hydrogen/tritium storage Crystal structure Phase transformation Binding energy 

分 类 号：TG139[一般工业技术—材料科学与工程]