Phase diagram of the Al2O3-ZrO2-Sm2O3 system.: III.: Solidus surface and phase equilibria in alloy crystallization

A projection has been constructed for the solidus surface in the Al2O3 - ZrO2 - Sm2O3 phase diagram on the plane of the concentration triangle, which consists of seven isothennal three-phase fields corresponding to two nonvariant equilibria of eutectic type and five nonvariant equilibria of peritectic type, and also eight lineated surfaces for the end of crystallization of the binary eutectics. The highest temperature on the solidus surface is 2 710 degrees C, the melting point of pure ZrO2, while the lowest is 1680 degrees C, the temperature of the triple eutectic Al + F + SA. No ternary phases or appreciable regions of solid solutions based on the components and the binary compounds are observed. Data on the bounding binary systems, the liquidus and solidus surfaces have been used to construct the phase-equilibrium (melting) diagram together with a reaction scheme for the equilibrium crystallization of alloys in the Al2O3 - ZrO2 - Sm2O3 system.