Abstract
A projection has been constructed for the solidus surface of the partial, Sc−ScRu−ScRh system on the concentration triangle from data obtained by microstructure analysis, x-ray diffraction, microprobe analysis, differential thermal analysis, and the measurement of temperatures for the start of melting by the Pirani-Alterthum method. It is found that ternary compounds are not formed in this system. The solidus surface has regions representing solid solutions based on β-scandium and phases based on the binary compounds Sc5Ru3, Sc2Ru, Sc11Ru4, Sc2Rh, and Sc3Rh, as well as ones for the δ and η phases (continous solid solution series formed between isostructural phases of CsCl type based on ScRu and ScRh as well as Sc57Rh13 based on Sc57Ru13 and Sc57Rh13). Other components of the solidus surface are twelve lineated surfaces, which bound two-phase volumes, and five isothermal surfaces, which correspond to nonvaiant four-phase equilibria involving the liquid, which occur at temperatures of 1150, 1055, 1045 (two equilibria), and 1000°C.
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