Microstructure and storage properties of low V-containing Ti–Cr–V hydrogen storage alloys prepared by arc melting and suction casting

Hai-Bin Wang¹，Qing Wang¹，Chuang Dong¹，Fen Xu²，Li-Xian Sun²，Chong-Lin Chen³

1. Key Laboratory of Materials Modification, Ministry of Education, Dalian University of Technology2. Materials and Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences3. Department of Physics and Astronomy, University of Texas at San Antonio

摘 要：The microstructure and hydrogen storage properties of low V content（Ti0.46Cr0.54） 100-x V x（x = 2.5–7.1, at%） and（TiyCr1-y）95V5（y = 0.38–0.54） alloys were investigated. These alloys were prepared by arc melting and copper mould suction casting. The structures of as-cast（Ti0.46Cr0.54） 100-x V x（x = 2.5, 5.0, and 7.1） alloy ingots evolve with V contents from pure Laves-（x = 2.5） to dual-phase TiCr2-BCC structures（5.0 and 7.1）, whereas the suction-cast（Ti0.46Cr0.54） 100-x V x（x = 2.5, 5.0, and 7.1） alloys only contain single BCC phase. The suctioncast alloy rod（Ti0.46Cr0.54）95V5, containing only 5.0 at% V is shown to possess the optimum hydrogen absorption capacity, with the maximum hydrogen content of 3.14 wt%. Furthermore, the hydrogen storage properties of the suction-cast low V alloys（TiyCr1-y）95V5（y = 0.38–0.54） are sensitive to Ti/Cr ratios and only those alloys with Ti/Cr ratios close to the CN14 cluster [Ti7Cr8 ] have good hydrogen storage properties.

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