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Irreversible transformation in as-cast FeAl B2-ordered alloy obtained by melt spinning

Published online by Cambridge University Press:  31 January 2011

E. Bonetti ,
R. Montanari ,
C. Testani  and
G. Valdrè
E. Bonetti
Affiliation:
INFM-Dipartimento di Fisica, Universita’ di Bologna, viale Berti Pichat 6/2, I-40127 Bologna, Italy
R. Montanari
Affiliation:
INFM-Dipartimento di Ingegneria Meccanica, Universita’ di Roma “Tor Vergata,”via di Tor Vergata 110, I-00133 Roma, Italy
C. Testani
Affiliation:
Centro Sviluppo Materiali, via di Castel Romano 100–102. I-00129-Roma, Italy
G. Valdrè
Affiliation:
INFM-Dipartimento di Fisica, Universita’ di Bologna, viale Berti Pichat 6/2, I-40127 Bologna, Italyand INFM-Dipartimento di Scienze della Terra e Geo-Ambientali, P.P. San Donato 1, Universita‘di Bologna, I-40126 Italy
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Abstract

The aim of the work described in the present paper was to investigate the microstructural stability during annealing treatments of a Fe–Al alloy obtained by melt spinning. To this purpose internal friction (IF) and dynamic modulus (Md) measurements were employed, and the results correlated with x-ray diffraction, optical microscopy, and scanning and transmission electron microscopy observations. In particular, the B2-ordered Fe–38A1–2Cr–0.015C–0.003B (in at.%) alloy was studied during repeated heating runs from room temperature to 823 K by IF and Md. The modulus exhibited a broad maximum (in the range of 600–800 K) only in the first run. On the basis of transmission electron microscopy and x-ray diffraction analysis, the irreversible transformation was explained by considering a two-stage process that occurs when vacancies in supersaturation move toward dislocations. The first stage is connected to dislocation locking; the second one is due to annihilation of some vacancies by dislocation climb.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 3 , March 2000 , pp. 659 - 664
Copyright
Copyright © Materials Research Society 2000

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References

REFERENCES

1.McKamey, C.G., De Van, J.H., Tortorelli, P.F., and Sikka, V.K., J. Mater. Res. 6, 1779 (1991).CrossRefGoogle Scholar
2.Liu, C.T., Sikka, V.K., and McKamey, C.G., Alloy Development of Fe–Al Aluminides Alloys for Structural Use in Corrosive Environments, Oak Ridge National Laboratory Report, Martin Marietta Energy Systems, Oak Ridge, TN.Google Scholar
3.Baker, I. and Gaydosh, D.J., Mat. Sci. Eng. 96, 147 (1987).CrossRefGoogle Scholar
4.Gaydosh, D.J., Draper, S.L., and Nathal, M.V., Metall. Trans. A 20, 1701 (1989).CrossRefGoogle Scholar
5.Liu, C.T. and McKamey, C.G., Scripta Metall. 23, 875 (1989).CrossRefGoogle Scholar
6.Liu, C.T., McKamey, C.G., and Lee, E.H., Scripta Metall. Mater. 24, 385 (1990).CrossRefGoogle Scholar
7.Morgand, P., Mouturat, P., and Sanford, G., Acta Metall. 6, 867 (1968).CrossRefGoogle Scholar
8.Prakash, U., Buckley, R.A., and Jones, H., Phil. Mag. A 64, 797 (1991).CrossRefGoogle Scholar
9.Prakash, U., Buckley, R.A., and Jones, H., High Temperature Ordered Intermetallic Alloys IV, edited by Johnson, L.A., Pope, D.L., and Stiegler, J.O. (Mater. Res. Soc. Symp. Proc. 213, Pittsburgh, PA, 1991), p. 691.Google Scholar
10.Christman, T. and Jain, M., Scripta Metall. Mater. 25, 767 (1991).CrossRefGoogle Scholar
11.Bonetti, E., Scipione, G., Valdré, G., Cocco, G., Frattini, R., and Macrì, P.P., J. Appl. Phys. 74, 2053 (1993).CrossRefGoogle Scholar
12.Baker, I., Schulson, E.M., and Stoloff, N.S., Mechanical Behaviour of Rapidly Solidified Materials, edited by Sastri, S.M.L, and MacDonald, B.A. (TMS, Warrendale, PA, 1986), p. 257.Google Scholar
13.Prakash, U., Buckley, R.A., and Jones, H., Acta Metall. Mater. 7, 1677 (1991).CrossRefGoogle Scholar
14.Xiao, H. and Baker, I., Acta Metall. Mater. 43, 391 (1995).Google Scholar
15.Warren, B.E., X-ray diffraction, (Addison-Wesley, Reading, MA, 1969), p. 208.Google Scholar
16.Williamson, G.K. and Smallman, R.A., Phil. Mag. 1, 34 (1956).CrossRefGoogle Scholar
17.Jones, F.W. and Sykes, C., Proc. R. Soc. A166, 316 (1938).Google Scholar
18.Nowick, A.S. and Berry, B.S., Anelastic Relaxation in Crystalline Solids (Academic Press, New York and London, 1972), p. 359.Google Scholar