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.
Revised: February 9, 2021 |
Published: November 1, 2018
Citation
Devaraj A., E.J. Kautz, L. Kovarik, S. Jana, N.R. Overman, C.A. Lavender, and V.V. Joshi. 2018.Phase transformation of metastable discontinuous precipitation products to equilibrium phases in U10Mo alloys.Scripta Materialia 156.PNNL-SA-134393.doi:10.1016/j.scriptamat.2018.07.010