Phase Separation kinetics in an Fe-Cr-Al alloy

Journal Article · Sun Jan 01 00:00:00 EST 2012 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2012.05.022· OSTI ID:1045219

Capdevila, C. ^[1]; Miller, Michael K ^[2]; Chao, J. ^[1]

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1. CENIM-CSIC, Madrid, Spain
2. ORNL

The {alpha}-{alpha}{prime} phase separation kinetics in a commercial Fe-20 wt.% Cr-6 wt.% Al oxide dispersion-strengthened PM 2000{trademark} steel have been characterized with the complementary techniques atom probe tomography and thermoelectric power measurements during isothermal aging at 673, 708, and 748 K for times up to 3600 h. A progressive decrease in the Al content of the Cr-rich {alpha}{prime} phase was observed at 708 and 748 K with increasing time, but no partitioning was observed at 673 K. The variation in the volume fraction of the {alpha}{prime} phase well inside the coarsening regime, along with the Avrami exponent 1.2 and activation energy 264 kJ mol{sup -1}, obtained after fitting the experimental results to an Austin-Rickett type equation, indicates that phase separation in PM 2000{trademark} is a transient coarsening process with overlapping nucleation, growth, and coarsening stages.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Shared Research Equipment Collaborative Research Center
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1045219
• Journal Information: Acta Materialia, Vol. 60, Issue 12; ISSN 1359-6454
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
AGING
ALLOYS
ATOMS
KINETICS
NUCLEATION
OXIDES
PROBES
STEELS
TOMOGRAPHY
TRANSIENTS