Phase Stability of the L1<sub>2</sub> Compound and Microstructural Changes in Co-(W or Mo)-Ta Ternary Alloys

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<jats:title>Abstract</jats:title><jats:p>Microstructural investigations of Co-5W-2.5Ta (at.%) and Co-4Mo-4.5Ta (at.%) ternary alloys were conducted. Fine coherent precipitates were observed in these alloys annealed at 800°C, and the crystal structures of precipitates (γ’) and matrix (γ) phase were identified as the L1<jats:sub>2</jats:sub> and A1 structure, respectively, by transmission electron microscopy. Cellular precipitation with a γ+χ(D0<jats:sub>19</jats:sub>) lamellar structure also proceeded at grain boundaries, and the alloys aged for a longer time only showed the γ+χ two-phase microstructure instead of the γ’ phase. With aging at around 800°C, the peak hardness of these alloys with a γ+γ’ two phase structure was about 580 Hv.</jats:p>

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  • MRS Proceedings

    MRS Proceedings 1128 2008-01-01

    Springer Science and Business Media LLC

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