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 language | English |
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Pages (from-to) | 230-235 |
Number of pages | 6 |
Journal | Journal of Alloys and Compounds |
Volume | 339 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 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