The Microstructure of Near-Equiatomic B2/f.c.c. FeNiMnAl Alloys

Journal Article · Fri Dec 31 23:00:00 EST 2010 · Materials Characterization

DOI:https://doi.org/10.1016/j.matchar.2011.07.009· OSTI ID:1023299

Baker, Ian ^[1]; Wu, H ^[1]; Wu, Xiaolan ^[1]; Miller, Michael K ^[2]; Munroe, P R ^[3]

---

1. Dartmouth College
2. ORNL
3. University of New South Wales

A microstructural analysis of two FeNiMnAl alloys, Fe{sub 30}Ni{sub 20}Mn{sub 30}Al{sub 20} and Fe{sub 25}Ni{sub 25}Mn{sub 30}Al{sub 20}, was performed by a combination of atom probe tomography and transmission electron microscopy techniques. Although the microstructures of both alloys, which consist of alternating platelets aligned along <100> of the B2-ordered phase, are similar to B2/b.c.c. two-phase alloys previously observed in the FeNiMnAl system, the two phases present in the current alloys are B2-ordered and f.c.c., with the latter phase being heavily twinned. Very fine ({approx} 5 nm) precipitates, whose chemistry was similar to that of the f.c.c. (Fe, Mn)-rich phase, were found within the B2 (Ni, Al)-rich phase in both alloys.

• Research Organization: Oak Ridge National Laboratory (ORNL); Shared Research Equipment Collaborative Research Center
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1023299
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Journal Issue: 10 Vol. 62; ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
ATOMS
CHEMISTRY
MICROSTRUCTURE
PROBES
TOMOGRAPHY
TRANSMISSION ELECTRON MICROSCOPY