We are conducting deformation experiments on Quartz using the D-DIA apparatus. Below are lattice spacings for the quartz (100), (101), and (112) reflections as a function of time during the deformation experiment. The calculated “hydrostatic” d-spacing is shown as a dashed line. The position of each reflection is measured as a function of time during the deformation experiment. D-spacings for the vertical pair of detectors (1 & 2) shrink more than for the horizontal pair (3 & 4), reflecting increasing differential stress.
We use Elastic-Plastic Self-Consistent (EPSC) Models to interpret our diffraction data. EPSC Models assume that ductile deformation is controlled by the motion of dislocations and/or by twinning. We were able to simulate our diffraction data collected at 800°C with an EPSC Model that used only basal and prismatic slip. This is consistent with the slip systems that are thought to operate at this temperature.