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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

REFERENCES

Wu, X., Baker, I., Wu, H., Miller, M.K. and Munroe, P.R., submitted to J. Mat. Sci. Google Scholar
Baker, I., Wu, H., Wu, X., Miller, M.K. and Munroe, P.R., Mat. Char. 62, 952 (2011).10.1016/j.matchar.2011.07.009CrossRefGoogle Scholar
Wittmann, M.W., Baker, I., Hanna, J.A. and Munroe PR, P.R., MRS Proc 842, S5.17, 35 (2005).Google Scholar
Wu, X., Baker, I., Miller, M.K., More, K.L., Bei, H. and Wu, H., Intermet. 32, 1 (2013).CrossRefGoogle Scholar
Loudis, J.A. and Baker, I., Philos. Mag. 87, 5639 (2007).CrossRefGoogle Scholar
Dahlgren, S.D., Met. Mater. Trans. A8, 347 (1977).CrossRefGoogle Scholar
Kato, M., Mori, T. and Schwartz, L.H., Acta Metall. 28, 285 (1980).CrossRefGoogle Scholar
Baker, I., Xiao, H., Klein, O., Nelson, C. and Whittenberger, J. D., Acta Metall. 43, 1723 (1995).10.1016/0956-7151(94)00369-SCrossRefGoogle Scholar
Baker, I., Mater. Sci. Eng. A 192, 1 (1995).10.1016/0921-5093(94)03200-9CrossRefGoogle Scholar