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<p>Mo-Co-B alloys of 14 compositions (4 for boundary binary systems and 10 for the ternary one) were prepared by arc melting in the Mo-MoB-Mo<sub>2</sub>CoB<sub>2</sub>-MoCoB-µ-Mo<sub>6</sub>Co<sub>7</sub> region. X-ray diffraction analysis (XRD), electron probe microanalysis (SEM/EPMA), differential thermal analysis (DTA) and pyrometric measurements after Pirani and Altertum were used to determine structure and phase transformation temperatures. Based on the obtained results, a projection of the solidus surface for Mo-rich alloys of the Mo-Co-B system was constructed for the first time. It consists of five wide and one narrow isothermal planes of three-phase equilibria, separated by narrow two-phase surfaces. It was found that the incipient melting temperatures of alloys decrease with increasing Co-content from 2268&#xa0;°C (the temperature of the peritectic reaction L<sub>p</sub> + β-MoB ↔ Mo<sub>2</sub>B in the binary Mo-B system) to 1249&#xa0;°C (the melting temperature of alloys of the three-phase region µ-Mo<sub>6</sub>Co<sub>7</sub> + Mo<sub>2</sub>CoB<sub>2</sub> + MoCoB), passing through five isothermal plateaus at temperatures of 2005, 1422, 1408, 1388 and 1249&#xa0;°C.</p>

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Phase Equilibria in Mo-Rich Alloys of the Mo-Co-B System at Subsolidus Temperatures

  • 期刊论文

  • 发表日期：

    2026年7月8日

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  • V. Z. Kublii,
  • Anatolii A. Bondar,
  • S. V. Utkin,
  • A. I. Ahapov

摘要

Mo-Co-B alloys of 14 compositions (4 for boundary binary systems and 10 for the ternary one) were prepared by arc melting in the Mo-MoB-Mo2CoB2-MoCoB-µ-Mo6Co7 region. X-ray diffraction analysis (XRD), electron probe microanalysis (SEM/EPMA), differential thermal analysis (DTA) and pyrometric measurements after Pirani and Altertum were used to determine structure and phase transformation temperatures. Based on the obtained results, a projection of the solidus surface for Mo-rich alloys of the Mo-Co-B system was constructed for the first time. It consists of five wide and one narrow isothermal planes of three-phase equilibria, separated by narrow two-phase surfaces. It was found that the incipient melting temperatures of alloys decrease with increasing Co-content from 2268 °C (the temperature of the peritectic reaction Lp + β-MoB ↔ Mo2B in the binary Mo-B system) to 1249 °C (the melting temperature of alloys of the three-phase region µ-Mo6Co7 + Mo2CoB2 + MoCoB), passing through five isothermal plateaus at temperatures of 2005, 1422, 1408, 1388 and 1249 °C.