Coarsening of a multimodal nickel-base superalloy

James Coakley, Hector Basoalto, David Dye

Research output: Contribution to journalArticle

39 Citations (Scopus)

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
Original languageEnglish
Pages (from-to)4019–4028
Number of pages10
JournalActa Materialia
Volume58
Issue number11
DOIs
Publication statusPublished - Jun 2010

Keywords

  • nickel alloys
  • modelling
  • diffusion
  • coarsening

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