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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 .
The existence behavior of helium in LaNi4 .75Al0.25 and Zr50 Co50 hydrogen storage alloys was studied by positron lifetime measurement and structural analysis. The results show that the helium infiltration increases with the increase of atmospheric pressure, , LaNi4 .75Al0.25 is more conducive to the infiltration of helium; the characteristic parameters of the positron lifetime of the ball-milled samples change, which indicates the existence of helium in the material differences in behavior; for the Zr50Co50 alloy, helium is first filled in ultra-fine With the increase of pressure in the atmosphere, a small part of helium is filled into the vacant free volume to form a vacancy helium complex. For LaNi4 .75Al0.25 alloy, helium first enters the vacancy In the size of the free volume, a vacancy helium complex is formed.