V-Ti-Cr系储氢合金吸氢动力学机制研究  

Kinetic Mechanisms of Hydrogen Absorption in V-Ti-Cr Alloys

作　　者：裴沛[1] 宋西平[1] 惠希东[1] 陈国良[1] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《西安交通大学学报》2008年第4期501-504,共4页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(50571017);北京市自然科学基金资助项目(2042015)

摘　　要：通过试验测试及动力学方程计算,研究了(TiCr)1-xVx(x=0.05,0.10,0.35)V-Ti-Cr系合金吸氢动力学机制.结果显示,随着钒含量的增加,合金由莱维氏单相结构逐渐转变为莱维氏相和低钒含量的体心立方(BCC)固溶体两相结构,最终转变为高钒含量的BCC固溶体单相结构.相应地,其吸氢机制也由化学反应控制,逐渐转变为形核长大机制,最终转变为三维扩散机制.相结构的变化同吸氢机制的变化有一定的对应关系,吸氢动力学机制不同,表现出吸氢速率不同,化学反应控制的吸氢过程速度较快,三维扩散机制控制的吸氢过程速度较慢.The kinetic mechanisms of （TiCr） 1-xVx （x=0. 05,0. 10,0. 35） alloys were investigated based on the experiments and kinetic function calculations. The results show that with the increase of vanadium content, the microstructure transforms from primary single Laves phase into Laves phase and low V body center cubic（BCC） solid solution double phases, and high V BCC solid solution single phase finally. Correspondingly, the kinetic mechanisms of hydrogen absorption in these alloys are found to be controlled firstly by a chemical reaction mechanism, then by a nucleation and growth mechanism, and a 3-dimensional diffusion mechanism. An apparent correspondence between phase structure and hydrogen absorption mechanism is observed — the alterant kinetic mechanisms often obviously change the kinetic reaction rate especially, for the faster chemical reaction mechanism and slower 3-dimensional diffusion mechanism.

关 键 词：储氢合金 体心立方固溶体 动力学机制 

分 类 号：TQ051.5[化学工程]