((1. 表面物理與化學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室，綿陽(yáng) 621907；2. 大連理工大學(xué) 材料科學(xué)與工程學(xué)院，大連 116024；3. 中國(guó)工程物理研究院，綿陽(yáng) 621900))
摘 要: 研究鑄態(tài)Ti-Zr-Ni準(zhǔn)晶體的貯氫特性。Ti40Zr40Ni20合金在吸鑄條件下形成了近單一的二十面體準(zhǔn)晶相(IQC相)，其吸氫坪臺(tái)壓力在170 ℃時(shí)約20 kPa，160 ℃時(shí)只有0.6 kPa，吸氫量為0.8%(質(zhì)量分?jǐn)?shù))；而Ti45Zr38Ni17合金在同樣條件下則形成了IQC、MgZn2結(jié)構(gòu)的C14 Laves相與體心立方結(jié)構(gòu)的β-(Ti, Zr)固溶相，它可實(shí)現(xiàn)室溫貯氫，150 ℃時(shí)貯氫量達(dá)到4%，且具有較好的吸氫動(dòng)力學(xué)。結(jié)果表明，合金成分與制備方法對(duì)Ti-Zr-Ni準(zhǔn)晶的貯氫特性有較大影響。
關(guān)鍵字: Ti-Zr-Ni合金；準(zhǔn)晶；貯氫；吸鑄
（(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
