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Plastic Deformation and the Role of Fault Formation in the Equation of State of Micron Size Intermetallic Alloys Under Non-Hydrostatic Pressure

Published online by Cambridge University Press:  01 February 2011

John K. Vassiliou ,
J. W. Otto ,
G. Frommeyer ,
J. J. Davis  and
P. Pinto
John K. Vassiliou
Affiliation:
Department of Physics, Villanova University, Villanova, PA 19085
J. W. Otto
Affiliation:
Joint Research Center for the European Commission, Brussels, Belgium
G. Frommeyer
Affiliation:
MPI Eisenforschung, 40237 Dusseldorf, Germany
J. J. Davis
Affiliation:
Department of Physics, Villanova University, Villanova, PA 19085
P. Pinto
Affiliation:
Department of Physics, Villanova University, Villanova, PA 19085
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Abstract

The elastic and plastic deformation of micron size anisotropic polycrystals of Ni3Al and Cu3Au intermetallic alloys have been studied under non-hydrostatic conditions by energy-dispersive X-ray diffraction (EDX) in a diamond-anvil cell. Compression was achieved by confining the samples in a viscous fluid or directly between the diamond anvils. Deviatoric forces are introduced in the samples as a result of the increasing viscosity with pressure and the eventual glassification of the pressurizing medium or by the contact forces of the diamond anvils. Line shifts and line profiles were used to analyze elastic and plastic strains. Plastic deformation is due to the onset of non-hydrostatic stresses and the introduction of stacking faults and dislocations. A volume incompressibility due to plastic deformation and the saturation of the stacking fault probability is followed by an elastic compression of a fully plastically deformed state. The compression of this state is isotropic and independent of the presence and type of the pressurizing medium. From the measured strains at different crystallographic orientations, the uniaxial stress and the stacking fault probability as a function of the confining pressure are derived and their role in the equation of state is examined. Using finite elasticity, the equation of state is derived in the presence of uniaxial stresses causing stacking faults, defects and dislocations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 791: Symposium Q – Mechanical Properties of Nanostructured Materials and Nanocomposites , 2003 , Q5.25
Copyright
Copyright © Materials Research Society 2004

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References

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