The microstructure of near-equiatomic B2/f.c.c. FeNiMnAl alloys

Journal Article · Sat Oct 15 00:00:00 EDT 2011 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2011.07.009· OSTI ID:22066344

Baker, I ^[1]; Wu, H; Wu, X ^[1]; Miller, M K ^[2]; Munroe, P R ^[3]

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1. Thayer School of Engineering, Dartmouth College, Hanover, NH 03755 (United States)
2. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 (United States)
3. Electron Microscope Unit, University of New South Wales, Sydney, NSW 2052 (Australia)

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. - Highlights: {yields} The microstructures of the novel 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} were characterized. {yields} Atom probe tomography and transmission electron microscopy were used in the study. {yields} A < 100>-aligned B2-ordered phase and heavily-twinned f.c.c. phase were present. {yields} Very fine (Fe, Mn)-rich precipitates were found within the B2 (Ni, Al)-rich phase.

• OSTI ID: 22066344
• Journal Information: Materials Characterization, Vol. 62, Issue 10; Other Information: Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
FCC LATTICES
INTERMETALLIC COMPOUNDS
IRON ALLOYS
MANGANESE ALLOYS
MICROSTRUCTURE
MONOCLINIC LATTICES
NICKEL ALLOYS
PRECIPITATION
SCANNING ELECTRON MICROSCOPY
TOMOGRAPHY
TRANSMISSION ELECTRON MICROSCOPY