Aluminum partitioning during phase separation in Fe-20%Cr-6%Al ODS alloy C. Capdevila*, M.K. Miller**, K.F. Russell** * Centro Nacional de Investigaciones Metalúrgicas (CENIM), Consejo Superior de Investigaciones científicas (CSIC), Avda. Gregorio del Amo, 8; Madrid, E-28040, Spain ** Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6136, USA Keywords: phase separation, solute partitioning, PM 2000 oxide dispersion strengthened steel Abstract Phase separation in a commercial Fe-20 wt% Cr-6% Al oxide dispersion-strengthened PM 2000 steel has been characterized with a local-electrode atom probe after isothermal ageing at 708 and 748 K for times up to 3600 h. A progressing decrease in the Al content of the Cr-rich  phase was observed with time at both ageing temperatures. The Al partitioning trend was consistent with theoretical calculations. However, the experimentally observed Al partitioning factor was significantly lower than the predicted equilibrium value. A ~10 nm diameter, roughly spherical, Al- and Ti-enriched  Fe(AlTi) phase was also observed.