Abstract
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.
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