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Phase Equilibria and Ternary Intermetallic Compound with L12 Structure in Co-W-Ga System

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Abstract

Phase equilibria and stabilities of intermetallic phases appearing in the Co-rich portion of the Co-W-Ga ternary alloys were investigated and isothermal section diagrams at 1200, 1100, 1000, and 900 °C were determined. A fine cuboidal phase with an L12 structure was observed at 900 and 800 °C, where the composition of the new ternary compound obtained by aging at 900 °C for the Co-7.4W-12.0Ga alloy was Co-11.2W-11.4Ga (at.%). It was confirmed that this compound is metastable at 900 °C but is more stable at 800 °C. These results mean that the thermodynamic stability of the metastable Co3W L12 phase, especially in the low temperature region, increases by the addition of Ga.

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Acknowledgments

This work was supported by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of the Science and by the Global COE Program “Materials Integration (International Center of Education and Research), Tohoku University”, MEXT, Japan. Support from CREST, Japan Science and Technology Agency is also acknowledged.

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Authors and Affiliations

  1. Department of Materials Science, Graduate School of Engineering, Tohoku University, 6-6-02 Aoba-yama, Sendai, 980-8579, Japan

    Hibiki Chinen, Toshihiro Omori, Katsunari Oikawa, Ikuo Ohnuma & Kiyohito Ishida

  2. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Sendai, 980-8577, Japan

    Ryosuke Kainuma

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  1. Hibiki Chinen
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  2. Toshihiro Omori
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  3. Katsunari Oikawa
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  4. Ikuo Ohnuma
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  5. Ryosuke Kainuma
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  6. Kiyohito Ishida
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Correspondence to Toshihiro Omori.

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Chinen, H., Omori, T., Oikawa, K. et al. Phase Equilibria and Ternary Intermetallic Compound with L12 Structure in Co-W-Ga System. J. Phase Equilib. Diffus. 30, 587–594 (2009). https://doi.org/10.1007/s11669-009-9580-4

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