The effect of γ matrix channel width on the compositional evolution in a multi-component nickel-based superalloy. (October 2022)

• Record Type: Journal Article
• Authors: Saksena, Aparna; Kubacka, Dorota; Gault, Baptiste; Spiecker, Erdmann; Kontis, Paraskevas
• Is Part Of: Scripta materialia. Number 219(2022)
• Publication Date: 2022-10
• Subjects: High-temperature diffusion -- Atom probe tomography -- Superalloys -- Compositional evolution; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2022.114853
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: High-temperature diffusion affects the long-term stability of superalloys and hence their service life. Yet, details of the mechanisms remain elusive. Here, the γ-γʹ microstructure itself is used as a nanoscale diffusion couple to study the diffusion of alloying elements within narrow and wide γ channels during annealing for up to 100 h at 750 °C in a nickel-based superalloy. Predictions from thermodynamic and kinetic calculations are compared to near-atomic experimental measurements as a function of the γ channel width. An overlooked width-dependence of compositional evolution is revealed that may directly affect the microstructural and compositional predictions of service life of nickel-based superalloys. Graphical abstract: Image, graphical abstract