采用真空感应熔炼方法制备了La0.83Mg0.17Ni3.1Co0.3 Al0.1和La0.63Gd0.2Mg0.17Ni3.2-xCo0.3Alx(x=0～0.4)贮氢合金,并在氩气气氛900℃进行退火处理.通过X射线衍射(XRD)、显微电子探针(EPMA)分析方法和电化学测试分析研究了Gd和Al元素对合金微观组织和电化学性能的影响.研究结果表明,该系列合金退火组织主要由Ce2Ni7/Gd2Co7型、Pr5Co19型、PuNi3型和CaCu5型相组成;Gd元素的加入使合金中CaCu5型相明显减少,Ce2Ni7型/Gd2Co7型相显著增加,x=0.1时其相丰度达到81.2%;随Al含量x不断增加,合金中CaCu5型相丰度逐渐增多,当x=0.1～0.2时,CaCu5型相丰度为4%～5%,x=0.4时,其相丰度达到66.65%.电化学测试分析表明,Gd和Al元素对合金电极活化性能影响不大,当x=0.1时,含Gd合金电极放电容量达到最大值391mAh·g-1,随Al含量x进一步增加,合金电极放电容量降低.含Gd和加入适量的Al元素可使合金电极循环稳定性得到明显提高,当Al含晕x=0.1,0.2时,经100次充放电循环后其电极容量保持率S100分别为93.7%和90.1%,其中La0.63Gd0.2Mg0.17Ni3.1Co0.3Al0.1合金具有最好的综合电化学性能.
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