Abstract
In this work, Fe-containing Co-free Ml(NiMnAlFe) 5 alloy samples were prepared by both arc-melting and melt-spinning processes at different solidification rates, and tested for electrochemical performance. The electrochemical tests indicated that higher solidification rates led to a better cycling stability, but lower discharge capacity and high-rate dischargeability. The X-ray diffraction results indicated that the as-cast alloy and the melt-spun alloys were both of the CaCu 5 -type structure single phase, but the lattice constants of the alloys were varying. The scanning electron microscope and EPMA results indicated that the microstructure of melt-spun alloy formed at the relative lower solidification rate (5 m/ s) was of very fine dendritic structure and that for the alloy formed at a relative higher solidification rate (15 m/ s) was of cellular structure, and both had a more homogeneous composition than the as-cast alloy, which had a typical dendrite structure with noticeable composition segregation. The Co-free MlNi 4.1 Mn 0.35 Al 0.3 Fe 0.25 prepared by melt-spinning at 15 m/ s rate is a promising candidate for low-cost electrode alloy.
Published Version
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