Phase transformation of metastable discontinuous precipitation products to equilibrium phases in U10Mo alloys. (November 2018)

• Record Type: Journal Article
• Authors: Devaraj, Arun; Kautz, Elizabeth; Kovarik, Libor; Jana, Saumyadeep; Overman, Nicole; Lavender, Curt; Joshi, Vineet V.
• Is Part Of: Scripta materialia. Number 156(2018)
• Page Start: 70
• Page End: 74
• Publication Date: 2018-11
• Subjects: Phase transformation -- Discontinuous precipitation -- Microstructural evolution -- Characterization; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.07.010
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The discontinuous precipitation (DP) mechanism is prevalent in over 80 alloy systems. We report a new type of DP occurring along prior γ-UMo grain boundaries of an alloy of uranium with 10 wt% molybdenum (U10Mo) during annealing at 500 °C, forming alternate lamellae of Mo-enriched γ-UMo and α-U. During prolonged annealing, the metastable Mo-enriched γ-UMo lamellae gradually transform into a composite mixture of equilibrium γ′-U2 Mo embedded in Mo-depleted γ-UMo. Using high resolution scanning transmission electron microscopy and atom probe tomography, a comprehensive description of the structural and compositional changes of the metastable lamellar DP product to near-equilibrium phases is provided. Graphical abstract: Unlabelled Image