Fig. 6: Microstructural evolution and phase-transformation characteristics of the CSU-S1 single-crystal superalloy. | npj Computational Materials

Fig. 6: Microstructural evolution and phase-transformation characteristics of the CSU-S1 single-crystal superalloy.

From: Alloy design integrating natural language processing and machine learning: breakthrough development of low-cost, high-performance Ni-based single-crystal superalloys

Fig. 6

a As-cast: typical dendritic structure with pronounced inter-dendritic segregation. b After homogenization: multi-step solution treatment (1300 °C/2 h + 1310 °C/4 h + 1313 °C/12 h) completely eliminates dendrites and yields a uniform γ matrix. c After two-step aging: regular arrays of cuboidal γ′ precipitates within the γ matrix. d DSC heating trace: endothermic peak at 1298.2 °C corresponds to the γ′ solvus; the second peak at 1353.3 °C marks the solidus. The measured solvus agrees within 3 °C with the SVR.rbf prediction (1301.3 °C). e γ′ size distribution. f Atomic-resolution HAADF-STEM image. g EDS elemental map. h FFT pattern.

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