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用铸造及快淬工艺制备Mg2Ni型Mg2-xLaxNi(x=0,0.2,0.4,0.6)贮氢合金.用XRD、SEM、HRTEM分析铸态及快淬态合金的微观结构,合金的气态贮氢动力学性能用自动控制的Sieverts设备测试,并用程控电池测试仪测试合金的电化学贮氢动力学.结果发现,La替代Mg明显地改变Mg2Ni型合金的相组成.当x≤0.2时,La替代Mg不改变合金的主相Mg2Ni,但出现少量的LaMg3及La2Mg17相.当La替代量x≥0.4时,合金的主相改变为(La,Mg)Ni3+LaMg3.快淬含La合金显示了以非晶相为主的结构,表明La替代Mg提高了Mg2Ni型合金的非晶形成能力.合金的气态及电化学吸放氢动力学对La含量及快淬工艺敏感,适当的快淬处理可以提高合金的气态及电化学贮氢动力学,但获得最佳贮氢动力学的快淬工艺与合金的成分密切相关.

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