Growth accidents induced by primary γ′ precipitates in a polycrystalline nickel-based superalloy. (September 2020)

• Record Type: Journal Article
• Authors: Charpagne, M.A.; Polonsky, A.T.; Echlin, M.P.; Jacomet, S.; Jaeger, J. de; De Graef, M.; Bozzolo, N.; Pollock, T.M.
• Is Part Of: Scripta materialia. Number 186(2020)
• Page Start: 109
• Page End: 113
• Publication Date: 2020-09
• Subjects: Nickel-base superalloy -- Critical recrystallization -- Annealing twin boundaries -- 3D EBSD -- Recrystallization; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.05.020
• Languages: English
• ISSNs: 1359-6462

Abstract

Graphical abstract: Abstract: 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.