Structure of alloys and the phase equilibrium diagram of the system Hf-Mo-C
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It is shown that the minimum initial melting temperature of alloys of the partial system Mo-HfC-C, 2120±2120°C, is linked with a four-phase invariant equilibrium of the congruent type, L=δ+β1+γ.
The curve of simultaneous crystallization of solid solutions of the cubic carbides (Hf, Mo) C1−x and graphite descends from 3150°C for the system Hf-C to 2560°C for the system Mo-C. The characteristic eutectic (δ+C) structure is not observed near the Mo-C side.
To determine conclusively the paths of crystallization in the region of compositions with more than 36 at.% of carbon and less than 6 at.% of hafnium, further high-temperature investigation by direct methods will be needed.
KeywordsCrystallization Graphite Carbide Solid Solution Melting Temperature
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