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.
- 4.Blackburn MJ, Nutting J (1964) J Iron Steel Inst 202:610Google Scholar
- 5.Lagneborg R (1967) ASM Trans Quart 60:67Google Scholar
- 6.Plumtree A, Gullberg R (1976) Metall Trans A 7A:1451Google Scholar
- 9.Miller MK (2000) Atom Probe Tomography. Kluwer Academic/Plenum Press, New YorkGoogle Scholar
- 10.Kuwano H (1985) Trans Jpn Inst Met 26:721Google Scholar
- 11.Kuwano H (1985) Trans Jpn Inst Met 26:730Google Scholar
- 12.Dubiel SM, Inden G (1987) Z MetaIlkd 78:544Google Scholar
- 13.Miller MK, Hetherington MG, Weertman JR, Calderon HA (1991) In: Stocks GM, Pope DP, Giamei AF (eds) Alloy phase stability and design. MRS, Pittsburgh, p 219Google Scholar
- 14.Hellman OC, Vandenbroucke JA, Rüsing J, Isheim D, Seidman DN (2000) Microsc Microanal 6:437Google Scholar