skip to main content


Title: Effect of stress evolution on microstructural behavior in U-Mo/Al dispersion fuel [Effect of stress on microstructural evolution in U-Mo/Al dispersion fuel]

U-Mo/Al dispersion fuel irradiated to high burnup at high power (high fission rate) exhibited microstructural changes such as deformation of the fuel particles, pore growth, and rupture of the Al matrix. The driving force for these microstructural changes was meat swelling caused by a combination of fuel particle swelling and interaction layer growth. Five miniplates with well-recorded fabrication data and irradiation conditions were selected, and their PIE data was analyzed. ABAQUS finite element analysis (FEA) was utilized to simulate the microstructural evolution of the plates. Using the simulation results shear stress, effective stress and hydrostatic stress exerted on both the fuel particles and the Al matrix were determined. The effects of fabrication and irradiation variables on stress-induced microstructural evolutions, such as pore growth in the interaction layers and Al matrix rupture, were investigated. The observed microstructural changes were consistent with the calculated stress distribution in the meat.
ORCiD logo [1] ;  [2] ; ORCiD logo [2] ;  [3] ;  [4] ;  [1]
  1. Ulsan National Institute of Science and Technology, Ulsan (Republic of Korea)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  4. Korea Atomic Energy Research Institute, Daejeon (Republic of Korea)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 487; Journal Issue: C; Journal ID: ISSN 0022-3115
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; FEA simulation; U-Mo dispersion fuel; meat swelling; mechanical analysis; microstructural evolution
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1396894