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.

中文翻译：

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热处理对单晶高熵高温合金组织演变的影响

研究了固溶热处理以及一次和二次时效处理条件对高熵高温合金组织演变的影响。铸态样品显示由于微偏析，在枝晶间区域出现了粗化的γ'沉淀和其他多余的相。这种微偏析使γ'固溶体不清楚，并降低了固相线。在进行了这项研究中确定的固溶处理后，发现了一次时效条件，该条件在1050°C下连续排列了4小时，呈立方立方γ'相，在950°C下连续20 h出现了球形γ'随机沉淀，其尺寸相似。通过使用这两个样品，发现了二次时效条件，这些条件在800°C下20 h出现了粗大的γ'二次沉淀和γ'内的γ颗粒，以及在850和870°C的20 h细小的γ'二次沉淀。