用铸造及快淬工艺制备了Mg2Ni型Mg20-xLaxNi10(x=0、2、4、6)贮氢合金.用XRD、SEM、HRTEM分析了铸态及快淬态合金的微观结构,结果发现,在快淬无La合金中没有出现非晶相,但快淬含La合金显示了以非晶相为主的结构.用DSC研究了快淬合金的热稳定性,表明La含量及快淬对非晶相的晶化温度影响很小.应用Sieverts装置研究了铸态及快淬态合金的吸放氢动力学,发现铸态合金的吸放氢量及动力学随La含量的增加显著改善,且快淬显著地改善了(x=2)合金的吸放氢动力学.电化学测试的结果表明,铸态合金的放电容量随La含量的增加而增加,(x=2)合金的放电容量随淬速的增加而增加.La替代Mg显著地提高了铸态及快淬态合金的循环稳定性.
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