Growth accidents induced by primary γ′ precipitates in a polycrystalline nickel-based superalloy

[Display omitted] The development of overgrown grains during sub-solvus annealing of a polycrystalline γ−γ′ nickel-base alloy is investigated, with special emphasis on the primary γ′ precipitates. Quantitative analysis conducted on a large three-dimensional electron back-scattered diffraction datase...

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Bibliographic Details
Published inScripta materialia Vol. 186; pp. 109 - 113
Main Authors Charpagne, M.A., Polonsky, A.T., Echlin, M.P., Jacomet, S., Jaeger, J. de, De Graef, M., Bozzolo, N., Pollock, T.M.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.09.2020
Elsevier
Subjects
3D EBSD
Annealing twin boundaries
Chemical Sciences
Condensed Matter
Critical recrystallization
Engineering Sciences
Material chemistry
Materials Science
Nickel-base superalloy
Physics
Recrystallization
Nickel-base superalloy
Critical recrystallization
Annealing twin boundaries
3D EBSD
Recrystallization
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Summary:[Display omitted] The development of overgrown grains during sub-solvus annealing of a polycrystalline γ−γ′ nickel-base alloy is investigated, with special emphasis on the primary γ′ precipitates. Quantitative analysis conducted on a large three-dimensional electron back-scattered diffraction dataset reveals a high fraction of γ′ precipitates on the annealing twin boundaries in the large grains. When observed in-situ in a scanning electron microscope, the formation of annealing twins is correlated to the crossing of γ′ precipitates by moving grain boundaries. The role of precipitates in the occurrence of growth accidents is discussed.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2020.05.020