Aluminum partitioning during phase separation in Fe–20%Cr–6%Al ODS alloy
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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 aging at 708 K and 748 K for times up to 3,600 h. A progressing decrease in the Al content of the Cr-rich α′ phase was observed with time at both aging 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 β′ Fe(AlTi) phase was also observed.
KeywordsAtom Probe Creep Strength Isothermal Aging Oxide Dispersion Strengthened Atom Probe Tomography
The authors acknowledge financial support from the Spanish Ministerio de Educación y Ciencia in the form of a Coordinate Project in the Energy Area of Plan Nacional 2006 (ENE2006-15170-C02). Research at the Oak Ridge National Laboratory SHaRE User Facility was sponsored by Basic Energy Sciences, US Department of Energy. PM 2000™ is a trademark of Plansee SE.
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