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A C15 Laves phase Ir 2 Y that forms in the Ir-Y binary system develops off-stoichiometry toward the Ir-rich composition at high temperatures, and its range of homogeneity becomes narrow with decreasing temperatures. One consequence of this solubility behavior is the formation of Ir 3 Y precipitates within the Ir 2 Y matrix of an Ir-30mol%Y alloy. The orientation relationship between Ir 3 Y and Ir 2 Y has been identified as: (0001) Ir3Y // (111) Ir2Y and [2110] Ir3Y // [110] Ir2Y . The similarity in the crystal structures of the two phases yields a plate-like Ir 3 Y precipitate showing a typical Widmanstatten structure. The growth of the precipitates has been suggested to follow the ledge mechanism. The interfacial character between the two phases has been identified in this study.

Growth Behavior and Interfacial Character of Ir<SUB>3</SUB>Y Precipitates in the Ir<SUB>2</SUB>Y Lave Phase Matrix