Viscous flow workability of Ni-Cr-P-B metallic glasses produced by melt-spinning in air

Masanori Yokoyama, Shin Ichi Yamaura, Hisamichi Kimura, Akihisa Inoue

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    Abstract

    We prepared the Ni80-xCrxP16B4 (x = 3, 6, 9, 12, 15,18, 21, 24, 27 and 30 at%) alloy ingots in an Ar flow atmosphere and then produced the alloy ribbons by melt-spinning. The thermal stability was examined and the alloy composition was optimized. A supercooled liquid state was observed in the alloys with Cr contents above 9 at% and the Tg and Tx increased with increasing Cr content. There is a tendency for ΔTx to increase with increasing Cr content up to 18 at%. The largest ΔTx is about 45 K and remains almost unchanged in the Cr content range above 15 at%. The groove-forming tests were performed for the alloy with optimized compositions. The Ni65Cr 15P16B4 glassy alloy was heated up to T g and was deformed by hot-pressing with dies in the supercooled liquid state. The alloy possessed a single glassy phase and the thermal stability parameters. Tg, Tx and ΔTx, of the alloy did not change even after the hot-pressing. Thus, the Ni-based glassy alloy was not thermally affected by the hot-pressing treatment in the present experimental condition. Finally, we successfully produced the metallic glassy separator for Proton Exchange Membrane Fuel Cell (PEMFC) by hot-pressing in the supercooled liquid state.

    Original languageEnglish
    Pages (from-to)3176-3180
    Number of pages5
    JournalMaterials Transactions
    Volume48
    Issue number12
    DOIs
    Publication statusPublished - 2007 Dec 1

    Keywords

    • Fuel cell
    • Hot-pressing
    • Nickel-based metallic glass
    • Proton exchange membrane fuel cell (PEMFC)
    • Separator

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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