Abstract
To clarify and comprehend the co-growing mechanism of γ/γ′ eutectic on MC-type carbide in a single crystal CM247LC superalloy, the interface and the elements' segregation between MC-type carbide and γ/γ′ eutectic was investigated in this paper. The results show that a semi-coherent boundary was observed having an orientation relationship of {1¯1¯1}MC‖{1¯1¯1}γ/γ′ with <011>MC || <011>γ/γ′. This interface structure resulted in a high interface energy, and a reduced preference of γ/γ′ eutectic's nucleation on MC-type carbide. However, this unfavorable interfacial feature was offset by the elements' segregation profile during the MC-type carbide's solidification, which is characterized by Al, Ni, Co and Cr enrichment and a co-growing mode.
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