Phase transformation of metastable discontinuous precipitation products to equilibrium phases in U10Mo alloys

Journal Article · Fri Jul 20 00:00:00 EDT 2018 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2018.07.010· OSTI ID:1464644

Devaraj, Arun  ^[1]; Kautz, Elizabeth J. ^[1]; Kovarik, Libor ^[1]; Jana, Saumyadeep ^[1]; Overman, Nicole ^[1]; Lavender, Curt A. ^[1]; Joshi, Vineet V.  ^[1]

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1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

In this study, the discontinuous precipitation (DP) mechanism is prevalent in over 80 alloy systems. We report a new type of DP occurring along prior -UMo grain boundaries of an alloy of uranium with 10 wt% molybdenum (U10Mo) during annealing at 500°C, forming alternate lamellae of Mo-enriched -UMo and -U. During prolonged annealing, the metastable Mo-enriched -UMo lamellae gradually transform into a composite mixture of equilibrium -U₂Mo embedded in Mo-depleted -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.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1464644
• Report Number(s): PNNL-SA-134393
• Journal Information: Scripta Materialia, Vol. 156, Issue C; ISSN 1359-6462
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE