Thermal stabilities and discharge capacities of melt-spun Mg-Ni-based amorphous alloys

Shin Ichi Yamaura, Hyang Yeon Kim, Hisamichi Kimura, Akihisa Inoue, Yoshiaki Arata

    Research output: Contribution to journalArticle

    84 Citations (Scopus)

    Abstract

    Mg-Ni-M (M=Ca, La or Pd) ternary alloys were synthesized by the melt-spinning technique. All as-solidified alloys possessed an amorphous single phase by the additional effect of the third element, though it was difficult to obtain an amorphous Mg67Ni33 binary alloy by melt-spinning. We examined the thermal stability and electrochemical cyclic life property of the ternary amorphous alloys. The crystallization temperature of the amorphous alloys increases with increasing M content. All the alloys except Mg67Ni28Pd5 examined in the present study maintain the amorphous structure even after hydrogen absorption at 373 K for Mg-Ni-Ca and Mg-Ni-Pd and at 423 K for Mg-Ni-La. The crystallization temperature increases by absorbing hydrogen, indicating that the alloys are thermally stabilized by hydrogen absorption. In the electrochemical cyclic life measurements up to five cycles, the Mg-Ni-Pd amorphous alloys exhibit high discharge capacities ranging from 100 to 400 mA h/g as well as small cyclic life degradation tendency, though the Mg-Ni-Ca and Mg-Ni-La amorphous alloys possess small discharge capacities of 10-100 mA h/g with significant cyclic life degradation. It is thus concluded that the good cyclic life property of the amorphous hydrogen storage alloys can be obtained by application of the melt-spinning technique to Mg-based alloys with appropriate alloy compositions.

    Original languageEnglish
    Pages (from-to)230-235
    Number of pages6
    JournalJournal of Alloys and Compounds
    Volume339
    Issue number1-2
    DOIs
    Publication statusPublished - 2002 Jun 13

    Keywords

    • Amorphous materials
    • Cyclic life property
    • Electrode materials
    • Magnesium-nickel(Mg-Ni)-based alloy
    • Rapid quenching

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

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