Coarsening of a multimodal nickel-base superalloy

James Coakley, Hector Basoalto, David Dye

Research output: Contribution to journalArticle

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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
LanguageEnglish
Pages4019–4028
Number of pages10
JournalActa Materialia
Volume58
Issue number11
DOIs
Publication statusPublished - Jun 2010

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Coarsening
Nickel
Superalloys
Precipitates
Numerical models
Experiments
Temperature

Keywords

  • nickel alloys
  • modelling
  • diffusion
  • coarsening

Cite this

Coakley, James ; Basoalto, Hector ; Dye, David. / Coarsening of a multimodal nickel-base superalloy. In: Acta Materialia. 2010 ; Vol. 58, No. 11. pp. 4019–4028.
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Coakley, J, Basoalto, H & Dye, D 2010, 'Coarsening of a multimodal nickel-base superalloy' Acta Materialia, vol. 58, no. 11, pp. 4019–4028. https://doi.org/10.1016/j.actamat.2010.03.017

Coarsening of a multimodal nickel-base superalloy. / Coakley, James; Basoalto, Hector; Dye, David.

In: Acta Materialia, Vol. 58, No. 11, 06.2010, p. 4019–4028.

Research output: Contribution to journalArticle

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