Characterization of nanoscale NiAl-type precipitates in a ferritic steel by electron microscopy and atom probe tomography

Journal Article · Fri Jan 01 00:00:00 EST 2010 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2010.03.013· OSTI ID:1048732

Teng, Zhenke ^[1]; Miller, Michael K ^[1]; Ghosh, Gautam ^[2]; Liu, Chain T ^[3]; Huang, Shenyan ^[1]; Russell, Kaye F ^[1]; Fine, Morris E ^[2]; Liaw, Peter K ^[4]

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1. ORNL
2. Northwestern University, Evanston
3. Hong Kong Polytechnic University
4. University of Tennessee, Knoxville (UTK)

The microstructure of NiAl-type ({beta}{prime}) precipitates in an aged ferritic steel (Fe-12.7Al-9Ni-10.2Cr-1.9Mo, at.%) is characterized by transmission and analytical electron microscopy (AEM) and atom probe tomography (APT). The alloy shows a duplex precipitation of {beta}{prime} particles: primary with an average diameter of 130 nm and secondary with an average diameter of 3 nm. Based on APT, the primary and secondary {beta}{prime} have compositions of Ni{sub 41.2}Al{sub 43.6}Fe{sub 12.7}Cr{sub 0.8}Mo{sub 1.4} and Ni{sub 26.3}Al{sub 41.6}Fe{sub 26.9}Cr{sub 3.3}Mo{sub 1.7}, respectively.

• 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: 1048732
• Journal Information: Scripta Materialia, Vol. 63, Issue 1; ISSN 1359-6462
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
ATOMS
ELECTRON MICROSCOPY
FERRITIC STEELS
MICROSTRUCTURE
PRECIPITATION
PROBES
TOMOGRAPHY