氦在球磨贮氢合金中的存在行为研究  

The occupying activities of helium in ball-milled hydrogen-storage alloys

作　　者：刘实[1] 郑华[1] 赵越[1] 熊良钺[1] 王隆保[1] 杨勋[2] 

机构地区：[1]中国科学院金属研究所,沈阳110016 [2]中国工程物理研究院,绵阳621900

出　　处：《物理学报》2003年第3期756-760,共5页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :5 0 13 10 5 0 )资助的课题~~

摘　　要：通过正电子寿命测量及结构分析 ,研究了氦气氛球磨LaNi4 .75Al0 .2 5和Zr50 Co50 贮氢合金中氦的存在行为 .研究结果表明 :随着气氛压力增加 ,氦的溶入量增加 ,相对而言 ,LaNi4 .75Al0 .2 5更有利于氦的溶入 ;球磨样品正电子寿命的特征参数发生变化 ,这表明氦在材料中存在行为的差异 ;对于Zr50 Co50 合金 ,氦首先填充在超细晶粒的三叉晶界或空位团处 ,随着气氛压力增加 ,有小部分氦填入单空位的自由体积处 ,形成空位 氦复合体 ;对于LaNi4 .75Al0 .2 5合金 ,氦首先进入单空位大小的自由体积中 ,形成空位 氦复合体 .Through the measurements of positron lifetime and analysis of structure, the properties of helium in the ball-milled LaNi4.75 Al-0.25 and Zr50Co50 alloys were investigated. It was found that the amount of the injected helium increases with increasing helium pressure. It is comparatively easier for helium to enter the LaNi4.75 Al-0.25 alloy. The difference of the positron lifetime parameters between the above two specimens shows that the properties of the injected helium are different. For Zr50Co50, helium occupies the intersection of two or three crystallite interfaces and/or cluster of vacancies at grain boundaries or groups of vacancies firstly. With increasing pressure of the helium atmosphere, a small amount of helium enters the free volume of single vacancies, and thus vacancy-helium compounds form. For LaNi4.75Al0.25 , helium enters the free volume of single; vacancies and vacancy-helium compounds form.

关 键 词：球磨 存在行为 正电子寿命 氦引入 贮氢合金 测量 粉末制造 

分 类 号：TG139.7[一般工业技术—材料科学与工程] TF123.111[金属学及工艺—合金]