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Improvements in Strength and Ductility of Feal-ZrB2 By Rapid Solidification

Published online by Cambridge University Press:  26 February 2011

David G. Morris  and
Maria A. Morris
David G. Morris
Affiliation:
Institute of Structural Metallurgy, University of Neuchâtel, 2000 Neuchâtel Switzerland
Maria A. Morris
Affiliation:
Institute of Structural Metallurgy, University of Neuchâtel, 2000 Neuchâtel Switzerland
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Abstract

Fe-35Al alloys containing various amounts of ZrB2 have been prepared by melt spinning and the microstructure and its stability examined. The mechanical properties are evaluated both on as cast materials as well as after high temperature heat treatments. The ZrB2 additions lead to a dramatic increase in hardness and strength. In addition, small amounts of ZrB2 lead to significant increases in ductility. Because the microstructure is fairly stable, these improvements in properties are maintained even after high temperature exposures.

Alloys with up to about 1%ZrB2 have the dispersoid particles arranged in an imperfect cellular microstructure after rapid solidification. The cell walls contain many fine particles and are efficient barriers against dislocation propagation. Strain occurs as dislocations escape through gaps in the imperfect cell walls at a stress level that is controlled by the size of these gaps. Ductility is improved since the deformation that results from such controlled strain progression through the material is much more uniform and large stress and strain concentrations are avoided.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 847
Copyright
Copyright © Materials Research Society 1991

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References

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