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Some Effects of Composition and Microstructure on the B2↔DO3 Ordered Phase Transition in Fe3Al Alloys

Published online by Cambridge University Press:  01 January 1992

P.J. Maziasz ,
C.G. McKamey ,
O.B. Cavin ,
C.R. Hubbard  and
T. Zacharia
P.J. Maziasz
Affiliation:
Oak Ridge National Laboratory, P.O. Box 2008 Oak Ridge, TN 37831 -6114
C.G. McKamey
Affiliation:
Oak Ridge National Laboratory, P.O. Box 2008 Oak Ridge, TN 37831 -6114
O.B. Cavin
Affiliation:
Oak Ridge National Laboratory, P.O. Box 2008 Oak Ridge, TN 37831 -6114
C.R. Hubbard
Affiliation:
Oak Ridge National Laboratory, P.O. Box 2008 Oak Ridge, TN 37831 -6114
T. Zacharia
Affiliation:
Oak Ridge National Laboratory, P.O. Box 2008 Oak Ridge, TN 37831 -6114
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Abstract

Binary Fe-28 at.% Al alloys (Fe3Al-type) transform from B2→DO3 ordered phases at 550°C upon cooling. More complex Fe-28Al alloys can have B2↔DO3 transition temperatures that range from 530 to 670°C. The kinetics of the B2→DO3 ordered phase transition also appear to be affected by alloy composition and by matrix dislocation microstructure. The binary and Nb-containing ternary alloys have rapid B2→DO3 transition kinetics during cooling. However, the ternary or more complex alloys that contain Cr have relatively slower phase transition kinetics during similar cooling. Deformation of a complex Fe-28Al-5Cr alloy in the B2 phase regime creates a very high matrix dislocation concentration, which coincides with complete suppression of the B2→DO3 phase transition during cooling.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 209
Copyright
Copyright © Materials Research Society 1995

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References

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