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Title: Modeling the Homogenization Kinetics of As-Cast U-10wt% Mo alloys

Abstract

Low-enriched U-22at% Mo (U-10Mo) alloy has been considered as an alternative material to replace the highly enriched fuels in research reactors. For the U-10Mo to work effectively and replace the existing fuel material, a thorough understanding of the microstructure development from as-cast to the final formed structure is required. The as-cast microstructure typically resembles an inhomogeneous microstructure with regions containing molybdenum-rich and -lean regions, which may affect the processing and possibly the in-reactor performance. This as-cast structure must be homogenized by thermal treatment to produce a uniform Mo distribution. The development of a modeling capability will improve the understanding of the effect of initial microstructures on the Mo homogenization kinetics. In the current work, we investigated the effect of as-cast microstructure on the homogenization kinetics. The kinetics of the homogenization was modeled based on a rigorous algorithm that relates the line scan data of Mo concentration to the gray scale in energy dispersive spectroscopy images, which was used to generate a reconstructed Mo concentration map. The map was then used as realistic microstructure input for physics-based homogenization models, where the entire homogenization kinetics can be simulated and validated against the available experiment data at different homogenization times and temperatures.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1332620
Report Number(s):
PNNL-SA-113656
Journal ID: ISSN 0022-3115; DN3001010
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 471; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
uranium; molybdenum; homogenization modeling; diffusion; microstructure characterization

Citation Formats

Xu, Zhijie, Joshi, Vineet, Hu, Shenyang Y., Paxton, Dean M., Lavender, Curt A., and Burkes, Douglas. Modeling the Homogenization Kinetics of As-Cast U-10wt% Mo alloys. United States: N. p., 2016. Web. doi:10.1016/j.jnucmat.2015.11.026.
Xu, Zhijie, Joshi, Vineet, Hu, Shenyang Y., Paxton, Dean M., Lavender, Curt A., & Burkes, Douglas. Modeling the Homogenization Kinetics of As-Cast U-10wt% Mo alloys. United States. doi:10.1016/j.jnucmat.2015.11.026.
Xu, Zhijie, Joshi, Vineet, Hu, Shenyang Y., Paxton, Dean M., Lavender, Curt A., and Burkes, Douglas. Fri . "Modeling the Homogenization Kinetics of As-Cast U-10wt% Mo alloys". United States. doi:10.1016/j.jnucmat.2015.11.026.
@article{osti_1332620,
title = {Modeling the Homogenization Kinetics of As-Cast U-10wt% Mo alloys},
author = {Xu, Zhijie and Joshi, Vineet and Hu, Shenyang Y. and Paxton, Dean M. and Lavender, Curt A. and Burkes, Douglas},
abstractNote = {Low-enriched U-22at% Mo (U-10Mo) alloy has been considered as an alternative material to replace the highly enriched fuels in research reactors. For the U-10Mo to work effectively and replace the existing fuel material, a thorough understanding of the microstructure development from as-cast to the final formed structure is required. The as-cast microstructure typically resembles an inhomogeneous microstructure with regions containing molybdenum-rich and -lean regions, which may affect the processing and possibly the in-reactor performance. This as-cast structure must be homogenized by thermal treatment to produce a uniform Mo distribution. The development of a modeling capability will improve the understanding of the effect of initial microstructures on the Mo homogenization kinetics. In the current work, we investigated the effect of as-cast microstructure on the homogenization kinetics. The kinetics of the homogenization was modeled based on a rigorous algorithm that relates the line scan data of Mo concentration to the gray scale in energy dispersive spectroscopy images, which was used to generate a reconstructed Mo concentration map. The map was then used as realistic microstructure input for physics-based homogenization models, where the entire homogenization kinetics can be simulated and validated against the available experiment data at different homogenization times and temperatures.},
doi = {10.1016/j.jnucmat.2015.11.026},
journal = {Journal of Nuclear Materials},
issn = {0022-3115},
number = ,
volume = 471,
place = {United States},
year = {2016},
month = {1}
}