γ′ precipitates with a twin orientation relationship to their hosting grain in a γ-γ′ nickel-based superalloy

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
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Suzanne Vernier, Jean-Michel Franchet, Christian Dumont, Philippe Vennegues, Nathalie Bozzolo. γ′ precipitates with a twin orientation relationship to their hosting grain in a γ-γ′ nickel-based superalloy. Scripta Materialia, Elsevier, 2018, 153, pp.10-13. ⟨10.1016/j.scriptamat.2018.04.037⟩. ⟨hal-01797496⟩

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