The electrode alloys La0.7,Mg0.3Co0.45Ni2.55-xFex (x = 0, 0.1, 0.2, 0.3, 0.4) were prepared by casting and rapid quenching. The influences of the substitution of Fe for Ni on their cycle stabilities as well as their structures were investigated in detail. The re-suits indicate that the substitution of Fe for Ni significantly improves the cycle stability of the alloys, and the positive impact of such a substitution on the cycle stability of the as-quenched alloy is much larger than that of the as-cast. All of the alloys have multiphase structures composed of two major phases, (La, Mg)Ni3 and LaNis, and a residual phase LaNi2. The substitution ofFe forNi helps the formation of a llke amorphous structure in the as-quenched alloy. With the increase of Fe content, the grains in the as-quenched ahoy are significantly refined, and the lattice constants and the cell volumes of the alloys are obviously enlarged.
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