Abstract
Data obtained by microstructural, x-ray phase, and microprobe analysis have been used together with measurements of the temperature for the start of melting by the Pirani - Alterthum method to obtain a projection of the solidus surface in the partial Ru-ScRu-ScRh-Rh system on the concentration triangle. It is found that ternary compounds are not formed. The solidus surface is made up of five surfaces for the primary crystallization of solid solutions based on ruthenium and rhodium together with phases based on the compounds ScRu2, ScRh3, and the 6 phase (a continuous series of solid solutions between isostructural phases of CsCl type based on ScRu and ScRh), together with seven lineated surfaces, which enclose two phase volumes, and three isothermal areas, which relate to nonvariant four-phase equilibria involving the liquid: L — + + 6 (1650°C), L + ⇌ + (1640°C) and L ⇌ + ⇌ + (1520°C).
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