通过溶体快淬成功制备了(Mg65Cu25)100-xNdx(x=2,5,7,10)非晶/纳米晶贮氢合金,利用透射电镜、X射线衍射仪和差热分析仪研究了合金的微观组织结构及其热性能,采用ARBINBTW-2000型电池测试仪研究了合金的贮氢性能.结果表明:随着钕含量的增高,合金的贮氢量呈现上升趋势.非晶(Mg65Cu25)93Nd7合金具有最好的贮氢动力学性能和贮氢容量,最高贮氢量达到3.0%(质量分数),而纳米晶(Mg65Cu25)98Nd2具有最低的贮氢动力学性能和贮氢容量.研究还表明,随着钕含量的增高,合金的非晶形成能力增强,非晶的这种独特的短程有序结构是提高贮氢性能的主要因素.
Amorphous and nanocrystalline Mg-based alloys (Mg6sCu25)100- xNdx(x=2,5,7,10) were prepared by melt-spinning.The microstructure of the as-quenched ribbons was characterized and the hydriding properties of these alloys were measured.The experiment results show that the as-quenched amorphous (Mg6sCu2s)93Nd7 alloy display the best hydriding properties(hydriding kinetics and hydrogen absorption capacity), its maximum hydrogen capacity is 3.0 wt%H. The nanocrystalline(Mg6sCu25)98Nd2 alloy shows slower hydriding kinetics and lower hydrogen absorption capacity compared to the other Mg-Cu-Nd amorphous alloys. It is conformed that the glass-forming ability becomes strong with the increase of neodymium for the as-quenched (Mg65Cu25)100-xNdxalloys, which leads to the high H-capacity.
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