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Effect of Aluminum Addition on Ductility and Yield Strength of Fe3Al Alloys with 0.5 wt % TiB2*

Published online by Cambridge University Press:  28 February 2011

C. G. McKamey ,
J. A. Horton  and
C. T. Liu
C. G. McKamey
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory Oak Ridge, TN 37831
J. A. Horton
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory Oak Ridge, TN 37831
C. T. Liu
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory Oak Ridge, TN 37831
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Abstract

Studies have been conducted of the mechanical properties of Fe3Al alloys containing 24 to 30 at.% Al, to which 0.5 wt% TiB2 was added for grain refinement. In tensile tests conducted at room temperature, it has been found that, as the aluminum content is increased, the yield strength decreases sharply from 760 to 310 MPa. The decrease in yield strength is accompanied by a four-fold increase in room-temperature ductility. Ordered iron aluminides (containing no disordered α phase) showed a clear increase in yield strength with temperature above 300°C. Their strength reached a maximum around 600°C, above which it decreased sharply. All these results will be discussed and correlated with stability of superlattice dislocations as a function of aluminum content.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 81: Symposium H – High-Temperature Ordered Intermetallic Alloys II , 1986 , 321
Copyright
Copyright © Materials Research Society 1987

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Footnotes

*

supported by the U.S. Department of Energy, Morgantown Energy Technology Center, Surface Gasification Materials Program under contract DE-ACO5-840R21400 with Martin Marietta Energy Systems, Inc.

References

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