Microstructure and Solidification Sequence of the Interdendritic Region in a Third Generation Single-Crystal Nickel-Base Superalloy
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An analysis of the microstructure of the interdendritic regions in an as-cast third generation single-crystal nickel-base superalloy CMSX-10K has been carried out using automated serial sectioning with sequential focused ion beam (FIB) milling and image capture of the secondary electron image in a combined FIB–scanning electron microscope (SEM). Two interdendritic morphologies with vastly different γ/γ′ spacing were identified; these are (1) fine γ/γ′ morphology and (2) coarse cellular γ′ separated by narrow γ channels. The FIB results indicate that following primary solidification (L → γ), solidification of the interdendritic region commences in areas that show the fine γ/γ′ morphology, (1) on the γ dendrite lobe. This is followed by a gradual transition to growth of the coarse cellular γ/γ′ channel structure, (2) which occur up to the termination of the solidification process.
KeywordsEutectic Reaction Interdendritic Region Section View SCHEIL Model Milled Depth
The authors acknowledge the funding support for Dual-beam facilities by the EPSRC (EP/E012477). H.B. Dong acknowledges the Royal Society and EPSRC for offering a Royal Society Industry Fellowship and Rolls-Royce plc for hosting him.
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