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Liquidus projection surface and isothermal section at 1000 °C of the Co-Pr-B (Co-rich) ternary phase diagram*

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Journal of Phase Equilibria

Abstract

The liquidus projection surface and the isothermal section at 1000 °C of the Co-Pr-B (Co-rich) ternary phase diagram have been determined. The binary and ternary intermetallics (Pr2Co17, PrCo5, Pr5Co19, Pr2Co7, PrCo3, PrCo2, C03B, C02B, CoB, P2Co14B, PrCo4B, PrCo12B, Pr3Co11B4, and Pr2Co7B3) that were examined in the Co-rich portion of the Co-Pr-B ternary phase diagram were found to be true line compounds (no detectable solid solubility). The primary solidification phase field of the Pr2Co14B intermetallic compound shares boundaries with the primary solidification phase fields of αCo, Pr2Co17, PrCo5, P1-C04B, and PrCo12B6 intermetallics. There are eight reactions associated with the Pr2Co14B intermetallic compound: two ternary eutectic reactions (E1 = Liquid ↔ Pr2Co14B + PrCo12B6 + PrCo4B and E2 = Liquid ↔ Pr2Co14B + PrCo12B6 + αCo), two pseudobinary eutectic reactions (e3 = Liquid ↔ Pr2Co14B + PrCo4B and e4 = Liquid ↔ Pr2Co14B + PrCo12B6), three ternary quasi-peritectic reactions (P1 = Pr2Co17 + Liquid ↔ Pr2Co14B + αCo, P2 = Pr2Co17 + Liquid ↔ PrCo5 + Pr2Co14B, and P3 = Pr2Co14B + Liquid ↔ PrCo4B + PrCo5), and one pseudobinary peritectic reaction (p8 = Pr2Co17 + Liquid ↔ Pr2Co14B). The composition of the magnetically important Pr2Co14B intermetallic falls inside the primary solidification phase field of the Pr2Co17 intermetallic. The reaction through which the Pr2Co14B is produced is therefore the pseudobinary peritectic reaction Pr2Co17 + Liquid ↔ P2Co14B. The PrCo12B6 and PrCo4B compounds are found to form congruently from the melt At the temperature of 1000 °C and depending on the alloy composition, the P2Co14B intermetallic can be found in solid-state thermodynamic equilibrium with one or two of the following phases: αCo, Pr2Co17, PrCo5, PrCo4B, and PrCo12B6. The obtained information about the Co-Pr-B phase diagram can be used to explain correctly all the phases present in the P2Co14B-based permanent magnets. The present work also emphasizes the extreme importance and usefulness of thermomagnetic measurements as an aid in the determination of phase diagrams that involve ferromagnetic phases.

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Authors and Affiliations

  1. Department of Materials Science & Engineering, Carnegie Mellon University, 15213, Pittsburgh, PA

    T. B. Massalski

Authors
  1. C. N. Christodoulou
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  2. T. B. Massalski
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  3. W. E. Wallace
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Additional information

*This research has been submitted by C.N. Christodoulou in partial fulfillment of the requirement for the degree of doctor of philosophy at Carnegie Mellon University.

**Present address: Mitsubishi Materials Corporation, Central Research Institute, 1-297 Kitabukuro-cho, Omiya, Saitama 330, Japan.

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Christodoulou, C.N., Massalski, T.B. & Wallace, W.E. Liquidus projection surface and isothermal section at 1000 °C of the Co-Pr-B (Co-rich) ternary phase diagram*. JPE 14, 31–47 (1993). https://doi.org/10.1007/BF02652159

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