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The Mechanical Properties of Near-equiatomic B2/f.c.c. FeNiMnAl Alloys

Published online by Cambridge University Press:  25 January 2013

Xiaolan Wu ,
Ian Baker ,
Hong Wu  and
Paul R. Munroe
Xiaolan Wu
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover NH 03755, U.S.A
Ian Baker
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover NH 03755, U.S.A
Hong Wu
Affiliation:
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, P.R.China
Paul R. Munroe
Affiliation:
Electron Microscope Unit, University of New South Wales, Sydney NSW 2052, Australia
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Abstract

Two types of as-cast microstructures have been observed in a series of near-equiatomic FeNiMnAl alloys: 1) an ultrafine microstructure in Fe30Ni20Mn20Al30 [1] and Fe25Ni25Mn20Al30, which consists of (Fe, Mn)-rich B2-ordered (ordered b.c.c.) and (Ni, Al)-rich L21-ordered (Heusler) phases aligned along <100>; and 2) a fine two-phase microstructure in Fe30Ni20Mn30Al20 and Fe25Ni25Mn30Al20, which consists of alternating (Fe, Mn)-rich f.c.c. and (Ni, Al)-rich B2-ordered platelets with an orientation relationship close to f.c.c (002) // B2 (002); f.c.c. [011] // B2 [001] [2]. The phases in Fe25Ni25Mn20Al30 coarsened upon annealing with no significant change in the chemical partitioning. The hardness behavior was studied as a function of the annealing time at 823 K. AnL21-to-B2 transition, which occurred at 573-623K, was observed using in-situ heating in a TEM. After annealing at 973 K for 100 h, needle-shaped clusters of (Fe, Mn)-rich precipitates were observed along the grain boundaries and in the matrix. The temperature dependence of the yield strength of as-cast Fe25Ni25Mn20Al30 was also studied.

Keywords

annealingtransmission electron microscopy (TEM)strength
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1516: Symposium JJ – Intermetallic-Based Alloys—Science, Technology and Applications , 2013 , pp. 249 - 254
Copyright
Copyright © Materials Research Society 2013 

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References

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