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A constitutional diagram of the system VC0.88−HfC0.98−(MoC)

  • Anorganische, Struktur- und Physikalische Chemie
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Monatshefte für Chemie - Chemical Monthly Aims and scope Submit manuscript

Abstract

The system VC0.88−HfC0.98−“MoC” was investigated by means of melting point, differential-thermoanalytical, X-ray diffraction and metallographic techniques on hot pressed and heat treated as well as melted alloy specimens and a constitutional diagram from 1500°C through the melting range established.

The small miscibility gap within the HfC−“MoC” system (T c=1630°C) interacts at lower temperatures with the solvus in a monotectoid-like reaction at ≈1575°C. Additions of VC to the HfC−“MoC” solid solution gradually increase its critical temperature.

Solid state phase behaviour and melting behaviour was established within the isopleths VC0.88−“MoC” as well as within (V0.5Hf0.5)C−“MoC” and (V0.75Hf0.25)C−(Hf0.75Mo0.25)C.

Phase equilibria within VC0.88−HfC−“MoC” are characterized by an extreme large miscibility gap at 1500°C connecting the VC−HfC and HfC−MoC systems.

Originating at the VC−HfC binary an eutectic trough proceeds into the VC−HfC−MoC ternary with rising temperatures, connecting the maximum critical point of the disappearing miscibility gap [(V0.31Hf0.49Mo0.20)C] by a limiting tie line (2750±20°C). Isothermal sections have been calculated assuming regular solutions.

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Authors and Affiliations

  1. Materials Science Department, Oregon Graduate Center for Study and Research, Beaverton, Oregon, USA

    Peter Rogl, Subhash K. Naik & Erwin Rudy

Authors
  1. Peter Rogl
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  2. Subhash K. Naik
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  3. Erwin Rudy
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Rogl, P., Naik, S.K. & Rudy, E. A constitutional diagram of the system VC0.88−HfC0.98−(MoC). Monatshefte für Chemie 108, 1339–1352 (1977). https://doi.org/10.1007/BF01046447

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  • DOI: https://doi.org/10.1007/BF01046447

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