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Coarsening of a multimodal nickel-base superalloy / James Coakley in Acta materialia, Vol. 58 N° 11 (Juin 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 11 (Juin 2010) . - pp. 4019–4028 Titre : Coarsening of a multimodal nickel-base superalloy Type de document : texte imprimé Auteurs : James Coakley, Auteur ; Hector Basoalto, Auteur ; David Dye, Auteur Année de publication : 2011 Article en page(s) : pp. 4019–4028 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Nickel  alloys  Coarsening  Diffusion  Modelling Résumé : 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. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S135964541000162X [article] Coarsening of a multimodal nickel-base superalloy [texte imprimé] / James Coakley, Auteur ; Hector Basoalto, Auteur ; David Dye, Auteur . - 2011 . - pp. 4019–4028. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 11 (Juin 2010) . - pp. 4019–4028 Mots-clés : Nickel  alloys  Coarsening  Diffusion  Modelling Résumé : 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. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S135964541000162X