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Deformation of Ni3Al Polycrystals at Extremely High Pressures

Published online by Cambridge University Press:  21 March 2011

John K. Vassiliou ,
J.W. Otto ,
G. Frommeyer ,
A. J. Viescas ,
K. Bulusu  and
H. Bellumkonda
John K. Vassiliou
Affiliation:
Dept. Physics, Villanova University, Villanova, PA 19085, USA
J.W. Otto
Affiliation:
Joint Research Center of the European Commission, Brussels, Belgium
G. Frommeyer
Affiliation:
MPI Eisenforschung, 40237 Dusseldorf, Germany Corresponding author: John.Vassiliou@Villanova.Edu
A. J. Viescas
Affiliation:
Dept. Physics, Villanova University, Villanova, PA 19085, USA
K. Bulusu
Affiliation:
Dept. Physics, Villanova University, Villanova, PA 19085, USA
H. Bellumkonda
Affiliation:
Dept. Physics, Villanova University, Villanova, PA 19085, USA
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Abstract

The compression behavior in a multi-anvil apparatus of a foil of Ni3Al embedded in a pressure medium of NaCl has been studied by energy-dispersive X-ray diffraction (EDX). At ambient temperature, the pressure and stresses, determined from line positions of NaCl, were constant throughout the sample chamber. Line positions and line widths of NaCl reflections were reversible on pressure release. Ni3Al polycrystals, in contrast, undergo extensive (ductile) plastic deformation above 4 GPa due to the onset of high non-hydrostatic stresses and the introduction of stacking faults and dislocations. Plastic deformation due to stacking faults leads to a volume incompressibility followed by elastic compression of a fully plastically deformed state. The compression of a fully plastically deformed material is elastic and isotropic, independent of the presence and type of pressure medium. A discontinuity in the compressibility at the transition back from plastic to elastic compression is due to the yield strength of the plastically deformed material and corresponds to the Hugoniot elastic limit.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N5.47.1
Copyright
Copyright © Materials Research Society 2001

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References

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