| Titre : | Coarsening of a multimodal nickel-base superalloy (2011) |
| Auteurs : | James Coakley, Auteur ; Hector Basoalto, Auteur ; David Dye, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Acta materialia (Vol. 58 N° 11, Juin 2010) |
| Article en page(s) : | pp. 4019–4028 |
| Note générale : | Métallurgie |
| Langues : | Anglais |
| Tags : | 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 |
