Γ′ precipitates with a twin orientation relationship to their hosting grain in a γ-γ′ nickel-based superalloy. (August 2018)

• Record Type: Journal Article
• Authors: Vernier, Suzanne; Franchet, Jean-Michel; Dumont, Christian; Vennéguès, Philippe; Bozzolo, Nathalie
• Is Part Of: Scripta materialia. Number 153(2018)
• Page Start: 10
• Page End: 13
• Publication Date: 2018-08
• Subjects: Gamma – gamma prime nickel-based superalloy -- Interphase boundary -- Twin boundary -- Recrystallization; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.04.037
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: In a polycrystalline γ-γ′ nickel-based superalloy, γ′ precipitates with a close-to-twin orientation relationship to their surrounding matrix (named T-type precipitates) are found in recrystallized grains located near specific unrecrystallized grains (named recovered grains). This type of γ/γ′ interface has not been reported in literature before. Inherited from the ingot conversion process, recovered grains are characterized by a high density of micrometric and close-to-coherent γ′ precipitates. Resulting from the interaction of the recrystallization front with the latter precipitates, the T-type precipitates appear to form onto the recrystallization front. The present paper details the crystallographic characteristics of the T-type precipitates. Graphical abstract: Unlabelled Image