采用XRD、PCT和TG-DSC方法研究了VFe合金取代TiCr1.8合金中部分Cr对其结构与吸放氢性能的影响.结果表明:随VFe取代Cr的量的增加,合金的相组成逐步由Laves相转变为BCC相,而且BCC相的晶胞参数随合金中VFe含量的增加而增大;合金的最大储氢量随VFe含量的增加而升高,合金的最大储氢量可达到5.2/结构单元,质量比约3.4%;但合金的可逆储氢量却随合金中VFe含量的增加先升高后降低;氢在BCC相的TiCr1.2(VFe)0.6合金中有两种具有不同结合能的储存位置.
Influences of partial substitution of VFe alloys for Cr on structure and hydrogen storage performances of TiCr1.8 alloy were studied by XRD, PCT and TG-DSC methods. Results show that phase composition gradually changes from single Laves phase to BCC phase. Crystal cell parameters are enlarged by increasing of VFe content in alloys. The maximum hydrogen capacity increases also with the increase of VFe content in alloys, The maximum hydrogen storage capacity is up to 5.2/a. f. u. (the unit of a.f.u. means the ratio of the number of absorbed hydrogen atoms to alloys formula unit) corresponding to 3.4% in mass. The reversible hydrogen storage capacity increases first, then decrease with the increase of VFe content in alloys. There exist two kinds of positions with different combining energy for hyotrogen storeage in TiCr1.2(VFe)0.6 alloy with BCC phase.
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