Isothermal section of garucu ternary phase diagram at 1073K: Formation of new ternary phase, Ga4Ru3Cu, and its structural relation with the garu ¢-phase

Takanobu Hiroto, Kazuya Honda, Kazue Nishimoto, Koichi Kitahara, Kaoru Kimura

    研究成果: Article査読

    抄録

    We have investigated the isothermal phase diagram of the GaRuCu ternary system at 1073 K by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and transmission electron microscopy to determine whether the stable icosahedral quasicrystal (i-phase) forms, as it does in the similar AlRuCu system, and new intermetallic phases exist. This is the first systematic investigation of the GaRuCu system. No stable i-phase is identified in the GaRuCu alloy system. However, we found a new ternary (¸) phase in the GaRuCu system, which is characterized as a C-centered orthorhombic lattice with a¸ = 11.80 ¡, b¸ = 6.04 ¡, and c¸ = 3.07 ¡. The (ideal) chemical composition of the ¸-phase is Ga50Ru37.5Cu12.5 (Ga4Ru3Cu). This new phase is stable up to 1073 K. Above 1173 K, the ¸-phase transforms to the cubic GaRu (¢) phase without any secondary phases. Thus, there is an orderdisorder transition between the low-temperature ¸-phase and the high-temperature cubic ¢-phase in this temperature range.

    本文言語English
    ページ(範囲)575-579
    ページ数5
    ジャーナルMaterials Transactions
    59
    4
    DOI
    出版ステータスPublished - 2018

    ASJC Scopus subject areas

    • 材料科学(全般)
    • 凝縮系物理学
    • 材料力学
    • 機械工学

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