2007 International RERTR Meeting

Abstracts and Available Papers Presented at the Meeting

Phase Stability of U-Mo Ti Alloys and Interdiffusion Behaviours of U-Mo-Ti/Al-Si

Jong Man Park, Ho Jin Ryu, Jae Soon Park, Seok Jin Oh, Chang Kyu Kim
Korea Atomic Energy Research Institute
Daedeokdaero 1045, Yuseong, Daejeon, 305-353, Korea

and

Yeon Soo Kim, Gerard. L. Hofman
Argonne National Laboratory, 9700 S. Cass Ave, Argonne, IL 60439, USA

ABSTRACT

As a remedy for reducing reaction between U-Mo and Al in U-Mo/Al dispersion fuel, adding an alloying element such as Zr and Ti in U-Mo has been proposed at ANL. Although ANL's work showed the potential effectiveness of these elements based on thermodynamic and metallurgical analyses, the effect of a Ti addition in U-Mo remains unproven. The out-of-pile tests of U-Mo-Ti alloys, which focused on phase stability and interdiffusion behavior against Al, are meaningful to predict their efficacy during an irradiation. At the 2006 RERTR conference, we presented our work on the interdiffusion behaviors of U-Mo-Zr/Al-Si. In this paper, we will present the results for substituting U-Mo-Zr with U-Mo-Ti. Unlike U-Mo-Zr alloys, the gamma-heat-treated U-7Mo-xTi (x=1~3 wt%) exhibited a metastable γ-U phase, regardless of the Ti content. In these samples, however, a small amount of second-phase precipitates with a high Ti concentration was observed. The gamma phase stability of the U-Mo-Ti alloys at 500^oC was similar to that of the U-Mo-Zr alloys. Interdiffusion test results between U-Mo-Ti alloys and Al-Si alloys will also be presented and a comparison with the previous results with U-Mo-Zr/Al-Si will also be included.

 

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