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Compression behaviour of elastically anisotropic polycrystals using energy-dispersive X-ray diffraction.
J W Otto1, J K Vassiliou, G Frommeyer
1Max-Planck-lnstitut for Eisenforschung, Max-Planck-Strasse 1, 40237 Dusseldorf,Germany.
Journal of Synchrotron Radiation
|May 1, 1997
Summary
This study reveals that copper-gold alloy (Cu3Au) foils undergo significant plastic deformation under non-hydrostatic pressure, deviating from standard equations of state due to shear stresses from the sodium chloride pressure medium.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Geophysics
Background:
- Understanding material behavior under extreme pressure is crucial for various scientific fields.
- Non-ideal powder compression deviates significantly from hydrostatic models.
- Shear stress transmission in pressure media influences material deformation.
Purpose of the Study:
- To investigate the compression behavior of a Cu3Au foil under non-hydrostatic pressure conditions.
- To analyze the impact of shear stresses from a sodium chloride (NaCl) pressure medium on material deformation.
- To explore deviations from hydrostatic equations of state in compressed non-ideal powders.
Main Methods:
- Utilizing energy-dispersive X-ray diffraction (EDXRD) within a diamond-anvil cell (DAC).
- Performing stress analysis and examining peak broadening of the Cu3Au foil.
- Conducting a complete pressure cycle, including re-pressurization after pressure release.
Main Results:
- Observed significant plastic deformation in the Cu3Au foil during compression and re-pressurization.
- Demonstrated substantial deviations from a hydrostatic equation of state.
- Identified shear stresses transmitted through the NaCl pressure medium as the origin of observed deformations.
Conclusions:
- Non-hydrostatic compression of non-ideal powders like Cu3Au foils leads to significant plastic deformation.
- The pressure medium (NaCl) plays a critical role in transmitting shear stresses, causing deviations from ideal compression behavior.
- Findings highlight the importance of considering non-hydrostatic effects in materials under pressure, particularly in geological and materials science applications.