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中文摘要：
用快淬技术制备了Mg2Ni型贮氢合金,合金的名义成分为Mg20-xLaxNi10（x=0,2,4,6）。用XRD、SEM、HRTEM分析了合金的微观结构。发现不含La的快淬合金中没有非晶相,但含La快淬合金中显示以非晶相为主。当La含量x≤2时,铸态合金的主相为Mg2Ni相,但随着La含量的进一步增加,铸态合金的主相改变为（La,Mg）Ni3＋LaMg3相。应用Sieverts设备研究了铸态及快淬态合金的吸放氢量及动力学,结果表明,x=2的合金吸放氢量及动力学随淬速的增加而增加,但对于x=6的合金,结果是相反的。电化学测试结果表明,x=2合金的放电容量随淬速的增加而增加,而对于x=6合金,结果也是相反的。快淬显著地提高了x=2,6合金的循环稳定性。
英文摘要：
Mg2Ni-type hydrogen storage alloys with nominal composition Mg20-xLaxNi10（x = 0,2,4,6） were prepared by melt spinning.The microstructures of the alloys were studied by XRD,SEM and HRTEM.It is found that no amorphous phase formed in the as-spun La-free alloy,but the as-spun alloys containing La mainly held a major amorphous phase.When La content x≤2,the major phase in the as-cast alloys is Mg2Ni phase,but with the further increase of La content,the major phase of the as-cast alloys changes into（La,Mg）Ni3＋LaMg3 phases.The hydrogen absorption and desorption kinetics of the as-cast and spun alloys were measured using an automatically controlled Sieverts apparatus,indicating that the hydrogen absorption and desorption capacity and the kinetics of the x = 2 alloy clearly increase with rising of spinning rate,but a contrary result is obtained for x = 6 alloy.The electrochemical measurement shows that the discharge capacity of the x = 2 alloy grows with rising of spinning rate,but it is a completely contrary result for x = 6 alloy.The melt spinning significantly improves the cycle stability of the x = 2 and 6 alloys.
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