Phase equilibria in the Co-Ti portion of the Co-Al-Ti ternary system

Journal of Phase Equilibria volume 22, Article number: 219 (2001) Cite this article

Abstract

Phase equilibria of 900, 1000, and 1100 °C in the Co-Ti portion of the Co-Al-Ti system were mainly determined by energy dispersion x-ray spectroscopy. On the Ti-Al side, the β-Ti (A2) phase region is extended by the addition of Co and the β-Ti + AlTi3 (D019) two-phase region appears in the ternary equilibrium, while the AlTi (L10), AlTi3, and β-Ti phases show very low solubility of Co. It was found that the two ternary intermetallic compounds, Co2AlTi (L21) and CoAl2Ti (D8 a ), exist over a wide solubility range along the CoAl(B2)-CoTi (B2) and CoAl3-CoTi3 sections, respectively. The ordering transition and the phase separation due to ordering of the β-Ti, CoAl, or CoTi and Co2AlTi phases fundamentally possessing the bcc structure are also discussed.

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Affiliations

  1. Department of Materials Science, Kitami Institute of Technology, Kitami, 090-8507, Hokkaido, Japan

    K. Ishikawa & K. Aoki

  2. Department of Materials Science, Graduate School of Engineering, Tohoku University, 980-8579, Sendai, Japan

    Y. Himuro, I. Ohnuma, R. Kainuma & K. Ishida

Authors
  1. K. Ishikawa
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  2. K. Aoki
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  3. Y. Himuro
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  4. I. Ohnuma
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  5. R. Kainuma
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  6. K. Ishida
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Ishikawa, K., Aoki, K., Himuro, Y. et al. Phase equilibria in the Co-Ti portion of the Co-Al-Ti ternary system. JPE 22, 219 (2001). https://doi.org/10.1361/105497101770338680

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Keywords

  • Phase Equilibrium
  • Ternary System
  • Isothermal Section
  • 20Al 20Ti
  • Ternary Intermetallic Compound