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Effects of Pressure on the Flow and Fracture of Polycrystalline NiAl

Published online by Cambridge University Press:  01 January 1992

R. W. Margevicius ,
J. J. Lewandowski ,
I. E. Locci  and
G. M. Michal
R. W. Margevicius
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106
J. J. Lewandowski
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106
I. E. Locci
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106
G. M. Michal
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106
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Abstract

The effects of testing NiAl in tension under a superimposed pressure are described. The flow stress decreases when subjected to pressure due to the generation of mobile dislocations. These dislocations can become pinned when subjected to aging at moderate temperatures and times. The ductility increases substantially when tested under a superimposed hydrostatic pressure. A new method for performing fracture toughness tests under superimposed pressure is also described.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 555
Copyright
Copyright © Materials Research Society 1995

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References

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