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

Abstract

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 -U 2Mo 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.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1464644
Report Number(s):
PNNL-SA-134393
Journal ID: ISSN 1359-6462
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 156; Journal Issue: C; Journal ID: ISSN 1359-6462
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Devaraj, Arun, Kautz, Elizabeth J., Kovarik, Libor, Jana, Saumyadeep, Overman, Nicole, Lavender, Curt A., and Joshi, Vineet V. Phase transformation of metastable discontinuous precipitation products to equilibrium phases in U10Mo alloys. United States: N. p., 2018. Web. doi:10.1016/j.scriptamat.2018.07.010.
Devaraj, Arun, Kautz, Elizabeth J., Kovarik, Libor, Jana, Saumyadeep, Overman, Nicole, Lavender, Curt A., & Joshi, Vineet V. Phase transformation of metastable discontinuous precipitation products to equilibrium phases in U10Mo alloys. United States. https://doi.org/10.1016/j.scriptamat.2018.07.010
Devaraj, Arun, Kautz, Elizabeth J., Kovarik, Libor, Jana, Saumyadeep, Overman, Nicole, Lavender, Curt A., and Joshi, Vineet V. Fri . "Phase transformation of metastable discontinuous precipitation products to equilibrium phases in U10Mo alloys". United States. https://doi.org/10.1016/j.scriptamat.2018.07.010.
@article{osti_1464644,
title = {Phase transformation of metastable discontinuous precipitation products to equilibrium phases in U10Mo alloys},
author = {Devaraj, Arun and Kautz, Elizabeth J. and Kovarik, Libor and Jana, Saumyadeep and Overman, Nicole and Lavender, Curt A. and Joshi, Vineet V.},
abstractNote = {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.},
doi = {10.1016/j.scriptamat.2018.07.010},
url = {https://www.osti.gov/biblio/1464644}, journal = {Scripta Materialia},
issn = {1359-6462},
number = C,
volume = 156,
place = {United States},
year = {2018},
month = {7}
}