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Microstructure and storage properties of low V-containing Ti–Cr–V hydrogen storage alloys prepared by arc melting and suction casting
基金项目:This project is financially supported by the National Natural Science Foundation of China (Nos. 51171035 and 11174044).
摘    要:The microstructure and hydrogen storage properties of low V content (Ti0.46Cr0.54)100-xVx (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-xVx (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-xVx (x =2.5, 5.0, and 7.1) alloys only contain single BCC phase. The suction-cast 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 [TiTCrs] have good hydrogen storage properties.

关 键 词:储氢合金  微观结构  电弧熔炼  存储性能  含钛  制备  TiCr2  V型
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