采用高频感应熔炼方法制备了PuNi3型La0.67Mg0.33Ni2.5Co0.5合金;用X射线衍射分析和电化学方法研究了添加不同Mg含量以补偿Mg元素烧损时合金的组织结构和电化学性能.X射线衍射分析(XRD)表明,铸态合金由PuNi3型主相和少量的CaCu5型第二相组成,铸态合金经1 223 K和10 h退火处理后,CaCu5型第二相可明显减少,其中Mg增加10%时得到纯度较高的PuNi3型组织.电化学测试表明,增加适当Mg含量和进行退火热处理能明显提高和改善合金电极容量、循环稳定性和大电流放电性能.与AB5型和AB2型Laves相贮氢合金比较,PuNi3型La0.67Mg0.33Ni2.5Co0.5贮氢合金具有电极容量高及优良的大电流放电性能.
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