Journal of Phase Equilibria and Diffusion

, Volume 27, Issue 6, pp 651–658 | Cite as

Diffusion reaction behaviors of U-Mo/Al dispersion fuel

  • Ho Jin Ryu
  • Jong Man Park
  • Chang Kyu Kim
  • Yeon Soo Kim
  • Gerard L. Hofman
Section I: Basic And Applied Research


The uranium (U)-molybdenum (Mo)/aluminum (Al) dispersion fuel that is currently under development for high-performance research reactors has shown complicated diffusion reaction behavior between the U-Mo particles and the Al matrix. Diffusion reactions in U-Mo/Al dispersion fuels were characterized by out-of-pile annealing tests and in-pile irradiation tests in the HANARO research reactor. The effect of the addition of a third element such as silicon (Si), Al, or zirconium (Zr) to U-Mo fuel, and the addition of Si to the Al matrix on the diffusion reaction were also investigated. The growth rate and activation energy for the reaction phases of U-Mo/Al dispersion fuels were obtained. The effect of alloying a small amount of a third element in U-Mo and of Si in the Al matrix on diffusion reaction kinetics was negligible in annealing tests conducted at ∼550 °C. γ phase stability in the U-Mo alloy was enhanced by the addition of 0.1 to 0.2 wt.% Si. The Si accumulated in the interdiffusion layer of U-Mo/Al-Si dispersion fuel annealed at ∼550 °C, whereas Zr migration to the interdiffusion layer of U-Mo-Zr/Al was negligible.


annealing tests diffusion reaction dispersion fuel irradiation tests reaction kinetics reaction layer 


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Copyright information

© ASM International 2006

Authors and Affiliations

  • Ho Jin Ryu
    • 1
  • Jong Man Park
    • 1
  • Chang Kyu Kim
    • 1
  • Yeon Soo Kim
    • 2
  • Gerard L. Hofman
    • 2
  1. 1.Nuclear Fuel Fabrication LabKorea Atomic Energy Research InstituteDaejeonSouth Korea
  2. 2.Nuclear Engineering DivisionArgonne National LaboratoryArgonne

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