钕含量对Mg-Cu-Nd非晶合金贮氢性能的影响(英文)

Effects of Neodymium Content on Hydrogen-Storage Properties of Mg-Cu-Nd Amorphous Alloys

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 （Mg65Cu25）loo-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 （Mg65Cu25）93Nd7 alloy display the best hydriding properties （hydriding kinetics and hydrogen absorption capacity）, its maximum hydrogen capacity is 3.0 wt%H. The nanocrystalline （Mg65Cu25）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）loo-xNdx alloys, which leads to the high H-capacity.