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Insights into the ternary eutectic microstructure formed in intercolony regions in Al 2 O 3 –ZrO 2 (Y 2 O 3 ) system
Author(s) -
Fu Liansheng,
Chen Guoqing,
Fu Xuesong,
Zhou Wenlong
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15941
Subject(s) - eutectic system , ternary operation , materials science , microstructure , volume fraction , thermodynamics , ternary numeral system , crystallography , metallurgy , chemistry , composite material , physics , computer science , programming language
Al 2 O 3 /ZrO 2 (Y 2 O 3 ) pseudo‐binary eutectic melt may solidify in the dendritic form at the low G / v ratio (thermal gradient G divided by growth rate v ) associated with the Y 2 O 3 microsegregation along the monovariant line. Especially, in the system with high Y 2 O 3 content (≥4.5 mol%), an Al 2 O 3 /ZrO 2 / YAG ternary eutectic in situ microstructure growing with a “plane front” will appear at the boundaries of dendritic structures. The volume fraction of the ternary eutectic increases with the increase in Y 2 O 3 content. It was found that the amount of ternary eutectic can be well predicted by the Scheil equation (or nonequilibrium lever rule).