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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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Abstract

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

Item type: Article
ID code: 30637
Keywords: nickel alloys, modelling , diffusion , coarsening, Engineering (General). Civil engineering (General), Polymers and Plastics, Metals and Alloys, Ceramics and Composites, Electronic, Optical and Magnetic Materials
Subjects: Technology > Engineering (General). Civil engineering (General)
Department: Faculty of Engineering > Design, Manufacture and Engineering Management
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Depositing user: Pure Administrator
Date Deposited: 09 May 2011 09:59
Last modified: 27 Mar 2014 09:19
URI: http://strathprints.strath.ac.uk/id/eprint/30637

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