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研究了V含量由5at%升高到35at%时,Ti-V-Cr储氢合金组织、相结构及储氢性能的变化。SEM及XRD结果显示:V含量为5at%的Ti-V-Cr合金由Cr1.97Ti1.07相和Cr2Ti相及很少量的Ti相组成;V含量为10at%的Ti-V-Cr合金除了包含前述的3相外还出现了一定量的V基bcc固溶体相;而V含量为35at%的Ti-V-Cr合金转变为以V基bcc固溶体为主相的固溶体储氢合金。随着V含量的升高和组织结构的变化,Ti-V-Cr合金最大吸氢量升高,放氢率也增大,但是吸氢速率显著减小,活化性能变差。室温下,V含量为35at%的合金具有最大的吸氢量并且放氢率也最高,最大储氢量和放氢率分别是2.86%(质量分数)和61%。
The changes of microstructure, phase structure and hydrogen storage properties of Ti-V-Cr hydrogen storage alloys were studied when V content increased from 5 at% to 35 at%. The results of SEM and XRD show that Ti-V-Cr alloy with V content of 5at% consists of Cr1.97Ti1.07 phase and Cr2Ti phase and a small amount of Ti phase. Ti-V-Cr alloy with V content of 10at% A certain amount of V-based bcc solid solution phase also appeared in addition to the above-mentioned three-phase, while Ti-V-Cr alloy with 35at% V content was transformed into a solid solution hydrogen storage alloy with V-based bcc solid solution as the main phase. With the increase of V content and the change of microstructure, the maximum hydrogen uptake and the hydrogen release rate of Ti-V-Cr alloy increased, but the hydrogen absorption rate decreased significantly and the activation performance deteriorated. At room temperature, the alloy containing 35at% V has the highest hydrogen absorption capacity and the highest hydrogen releasing rate. The maximum hydrogen storage capacity and hydrogen releasing rate are 2.86% (mass fraction) and 61% respectively.