Abstract The morphology and kinetics evolution of γ′ and γ phases in Ni-xAl-(20‒x)Cr at% (x = 7.5–13.7) alloys aged at 700 °C were studied by utilizing the phase-field simulation. The separated γ′ phases from γ matrix in low Al content (x 13) alloys, and long-time aging produced near cubic γ′ phase. The coarsening rate of γ′ phase declined firstly when the Al content x = 7.5–9.0, then increased sharply as x ranges from 9 to 12, while the coarsening rate of γ phase declined directly. Additionally, the average edge-to-edge distance of neighboring γ′ phases showed a three-stage variation when Al content x

中文翻译：

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Ni-xAl-(20-x)Cr at%合金中γ'和γ相的形貌和动力学演变

摘要 利用相场模拟研究了Ni-xAl-(20-x)Cr at% (x = 7.5-13.7)合金在700 °C时效时γ'和γ相的形貌和动力学演变。在低 Al 含量 (x 13) 合金中，从 γ 基体中分离出的 γ' 相和长时间时效产生接近立方 γ' 相。当Al含量x=7.5-9.0时，γ'相的粗化率先下降，然后随着x在9-12范围内急剧增加，而γ相的粗化率直接下降。此外，当 Al 含量 x