Influence of rapid quenching on hydrogen storage characteristics of nanocrystalline Mg₂Ni-type alloys

来源期刊：中国有色金属学报(英文版)2010年第8期

论文作者：张羊换 赵栋梁 李保卫 郭世海 祁焱 王新林

文章页码：1439 - 1446

Key words：Mg₂Ni-type alloy; rapid quenching; hydrogen storage characteristic

Abstract: Nanocrystalline Mg₂Ni-type alloys with nominal compositions of Mg₂₀Ni_10–xCu_x (x = 0, 1, 2, 3, 4, mass fraction, %) were synthesized by rapid quenching technique. The microstructures of the as-cast and quenched alloys were characterized by XRD, SEM and HRTEM. The electrochemical hydrogen storage performances were tested by an automatic galvanostatic system. The hydriding and dehydriding kinetics of the alloys were measured using an automatically controlled Sieverts apparatus. The results show that all the as-quenched alloys hold the typical nanocrystalline structure and the rapid quenching does not change the major phase Mg₂Ni. The rapid quenching significantly improves the electrochemical hydrogen storage capacity of the alloys, whereas it slightly impairs the cycling stability of the alloys. Additionally, the hydrogen absorption and desorption capacities of the alloys significantly increase with rising quenching rate.

基金信息：the National Natural Science Foundation of China
the Natural Science Foundation of Inner Mongolia, China