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Coarsening of a multimodal nickel-base superalloy

Coakley, James and Basoalto, Hector and Dye, David (2010) Coarsening of a multimodal nickel-base superalloy. Acta Materialia, 58 (11). 4019–4028. ISSN 1359-6454

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The coarsening of γ′-Ni3Al precipitates in the nickel superalloy Ni115 has been examined and compared to the results of a numerical model based on LSW coarsening theory. Ni115 has a γ′ fraction of around 60%, and at the coarsening temperatures of interest the γ′ distribution is bimodal, with two populations 5 nm and 90 nm in radius. It is found that during the initial transient (around 2000 h at 800 °C), the fine γ′ dissolve, leading to a rapid increase in the mean radius followed by a plateau. At long times, the expected steady-state unimodal t1/3 coarsening is observed. The model reproduces these features in form and approximately in magnitude, a first for LSW model-experiment comparisons in nickel superalloys