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研究了铸态及经加热温度为 12 73～ 13 73K、保温时间 8h和水冷处理后AB5型MlNi3 .60Co 0 .85Mn0 .4 0Al0 .15贮氢电极合金的微结构和电化学性能。结果表明 :铸态合金的显微组织为典型的树枝晶结构 ,经 12 73K处理后合金的显微组织仍为树枝晶 ,但树枝结构不明显 ,经 13 73K处理后合金的显微组织为柱状晶 ;与铸态合金相比 ,经 12 73K处理后合金的活化性能降低 ,电化学容量和高倍率放电性能基本保持不变 ,循环寿命改善 ;经 13 73K处理的合金活化性能降低 ,电化学容量明显减小 ,高倍率放电性能降低 ,循环寿命显著改善。热处理引起合金电化学性能的变化与合金的微结构的改变有关
The microstructures and electrochemical properties of the hydrogen storage electrode alloy AB5-type MlNi3 .60Co0.85Mn0.400Al0.15 were studied after as-cast and heated at 1273 ~ 1373K, holding time 8h and water cooling treatment. The results show that the microstructure of as-cast alloy is typical dendritic structure. The microstructure of as-cast alloy is still dendritic after 1273K treatment, but the dendrite structure is not obvious. The microstructure of as-cast alloy after 1373K treatment is columnar Compared with the as-cast alloy, the activation energy of the alloy after 1273K treatment decreases, the electrochemical capacity and high-rate discharge performance remain basically unchanged, and the cycle life is improved. The activation performance of the alloy after 1373K treatment decreases. The electrochemical capacity Significantly reduced, high-rate discharge performance decreased, significantly improved cycle life. The change of the electrochemical properties caused by the heat treatment is related to the change of the microstructure of the alloy