铸态Ti-Zr-Ni准晶的贮氢特性

Hydrogen storage of as-cast Ti-Zr-Ni quasicrystals

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。

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.