The phase diagram of the Al2O3-ZrO2-Sm2O3 system.: IV.: Polythermal sections of the phase diagram

Three polythermal sections have been constructed to give a fuller description of the phase diagram structure for the Al2O3 - ZrO2 - Sm2O3 system over wide ranges in temperature and concentration, which indicate the interactions in the ternary system. The bisector of the angle Sm2O3 - (50 mole% Al2O3 - 50 mole% ZrO2) indicate the structure of the phase diagram in the region rich in Sm2O3, and also the mechanisms of the phase transformations of solid sohrtions based on Sm2O3: X double left right arrow H double left right arrow A double left right arrow B. The 20 mole% ZrO2 isoconcentrate (20Z) indicates the phase diagram structure in the region adjoining the binary bounding system Al2O3 - Sm2O3. The 40 mole% isoconcentrate (40Z) describes the phase diagram in regions rich in ZrO, as well as the mechanism for the solid-solution phase transformation F double left right arrow T based on ZrO2. These sections intersect three nominally quasibinary sections in the ternary system and indicate the dynamic of the width change in the two phase regions.