Abstracts and Available Papers Presented at the 2002 International RERTR Meeting
ATOMISTIC MODELLING OF THE INTERDIFFUSION OF Al IN THE UMo BASED FUEL
Jorge E. Garcés a,b, Armando C.
Marino a and Guillermo Bozzolo b,c
Centro Atómico Bariloche, Comisión
Nacional de Energía Atómica, 8400 Bariloche, Argentina
b Ohio Aerospace Institute, 22800 Cedar Point Rd.,
Cleveland, OH 44142, USA
c NASA Glenn Research Center, Cleveland, OH 44135, USA
analysis of the initial stages and trends in the process of interdiffusion of
Al in the UMo solid solution as a function of Mo concentration is made using
the BFS method for alloys. The approach presented in this work helps to
understand the exchange mechanism between adatoms and substrate atoms in the
binary systems, leading to the behavior observed in the ternary Al-U-Mo system.
While in Al/U Al atoms show a noticeable tendency to interdiffusion in the
bulk, in Al/Mo the same atoms show a tendency to layer-by-layer growth and the
formation of structures in the overlayer. In the case of Al/U‑Mo, the two
competing behaviors observed for Al/Mo and Al/U, translate into the role of
regions rich in Mo acting as interdiffusion barriers, in excellent agreement
with experimental evidence.