摘要
The effect of solution heat treatment as well as primary and secondary aging treatment conditions on the microstructural evolution of a high-entropy superalloy was investigated. The as-cast sample shows coarsened γ ′ precipitates and other extra phases at interdendrite region due to microsegregation. This microsegregation makes γ ′ solvus unclear and decreases the solidus. After conducting the solution treatment determined in this study, primary aging conditions showing an aligned cubic γ ′ phase at 1050 ◦ C for 4 h and random spherical γ ′ precipitates at 950 ◦ C for 20 h in similar size were found. By using both samples, secondary aging conditions showing coarsened secondary γ ′ precipitates and γ particles inside the γ ′ precipitates at 800 ◦ C for 20 h and fine secondary γ ′ precipitates at 850 and 870 ◦ C for 20 h were found.