An. Nikitin et al., INVESTIGATIONS OF TEXTURE FORMATION IN GEOMATERIALS BY NEUTRON-DIFFRACTION WITH HIGH-PRESSURE CHAMBERS, High pressure research, 14(1-3), 1995, pp. 155-162
This paper suggests a classification of texture in quartzitic rocks. P
ossible mechanisms of texture formation and their relation to tectonic
processes are discussed. A scheme for the experimental varification o
f some methods describing the evolution of deformation structures in g
eological materials in dependence on various external conditions (high
pressures, temperatures, various loadings, etc.) acting on a sample i
s proposed. To investigate '' in situ '' the mechanisms of texture for
mation in rocks, high pressure devices are under construction. They wi
ll be built of a special T-i - Z(r) alloy, which has zero coherent sca
ttering length and therefore is well suited for neutron diffraction in
vestigations. Two different devices are proposed. The first one allows
neutron diffraction measurements of sample volumes up to 4 cm(3), a h
ydrostatic pressure of 1, 5 GPa, a temperature of 300 degrees C, and u
niaxial compression up to 50 kN. Pressure, temperature and axial load
are measured inside the chamber. Besides, during the experiment, diagr
ams, of load, elastic wave velocities and acoustic emission will be re
corded. The second chamber is designed to investigate the mechanisms o
f texture formation in polycrystal samples (rocks or their imitations)
at temperatures up to 800 degrees C and axial compression with a forc
e of up to 150 kN.