Open AccessCompression Behaviour of Elastically Anisotropic Polycrystals Using Energy‐Dispersive X‐ray Diffraction
Author(s) -
Otto J. W.,
Vassiliou J. K.,
Frommeyer G.
Publication year - 1997
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049597003294
Subject(s) - diffraction , materials science , diamond anvil cell , foil method , compression (physics) , hydrostatic equilibrium , equation of state , anisotropy , hydrostatic pressure , deformation (meteorology) , shear (geology) , composite material , optics , crystallography , thermodynamics , physics , chemistry , quantum mechanics
The compression behaviour of a foil of Cu 3 Au in a pressure medium of NaCl has been studied by energy‐dispersive X‐ray diffraction in a diamond‐anvil cell. Evidence from stress analysis and peak broadening of the foil (the most extreme example of a non‐ideal powder) throws light on the compression of powders under non‐hydrostatic conditions. A complete pressure cycle, including re‐pressurization after pressure release, shows that significant plastic deformation takes place which results in large deviations from a (hydrostatic) equation of state. The origin of the deformations is traced to shear stresses transmitted to the sample through the pressure medium.