((1. 表面物理与化学国家重点实验室，绵阳 621907；2. 大连理工大学 材料科学与工程学院，大连 116024；3. 中国工程物理研究院，绵阳 621900))
摘 要: 研究铸态Ti-Zr-Ni准晶体的贮氢特性。Ti40Zr40Ni20合金在吸铸条件下形成了近单一的二十面体准晶相(IQC相)，其吸氢坪台压力在170 ℃时约20 kPa，160 ℃时只有0.6 kPa，吸氢量为0.8%(质量分数)；而Ti45Zr38Ni17合金在同样条件下则形成了IQC、MgZn2结构的C14 Laves相与体心立方结构的β-(Ti, Zr)固溶相，它可实现室温贮氢，150 ℃时贮氢量达到4%，且具有较好的吸氢动力学。结果表明，合金成分与制备方法对Ti-Zr-Ni准晶的贮氢特性有较大影响。
关键字: Ti-Zr-Ni合金；准晶；贮氢；吸铸
（(1. National Key Laboratory for Surface Physics and Chemistry, Mianyang 621907, China;2. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China;3. China Academy of Engineering Physics, Mianyang 621900, China)）
Abstract:Hydrogen storage characteristics of quasicrystalline alloys Ti40Zr40Ni20 and Ti45Zr38Ni17 prepared by suction-casting method were investigated primarily. Ti40Zr40Ni20 alloy, in which a nearly pure icosahedral quasicrystal (IQC) phase can form, has a low H-absorbing capacity of 0.8% (mass fraction) and different plateau pressures at different temperatures, 20 kPa at 170 ℃ and 0.6 kPa at 160 ℃, respectively. However, a minor mixture of C14 Laves (MgZn2-type) and β-(Ti, Zr) solution (bcc structure) phases is coexisted with the IQC in Ti45Zr38Ni17 alloy that can load H at room temperature with a maximum storage of 4% at 150 ℃ and displayed good H-absorption dynamic behaviors, suggesting a promising future as new H-absorbing material. The results show that the alloy composition and preparation of Ti-Zr-Ni IQC have a significant effect on its H storage.
Key words: Ti-Zr-Ni alloy; quasicrystal; hydrogen storage; suction-casting
