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Dauphiné twinning and texture memory in polycrystalline quartz

Part 2: In situ neutron diffraction compression experiments

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Mechanical twinning in polycrystalline quartz was investigated in situ with time-of-flight neutron diffraction and a strain diffractometer. Dauphiné twinning is highly temperature sensitive. It initiates at a macroscopic differential stress of 50–100 MPa and, at 500°C, saturates at 400 MPa. From normalized diffraction intensities the patterns of preferred orientation (or texture) can be inferred. They indicate a partial reversal of twinning during unloading. The remaining twins impose residual stresses corresponding to elastic strains of 300–400 microstrain. Progressive twinning on loading and reversal during unloading, as well as the temperature dependence, can be reproduced with finite element model simulations.

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We are appreciative to Erik Rybacki for providing novaculite samples. In situ deformation measurements were performed with neutron diffraction at LANSCE (SMARTS) and ISIS (ENGIN-X). Comments from C. McCammon, J. Tullis and an anonymous reviewer were very helpful. Research was supported by NSF (EAR 0337006), DOE (DE-FG02-05ER15637) and IGPP-LLNL. The work of NB was performed under the auspices of the U.S. Department of Energy by University of California, Lawrence Livermore National Laboratory under Contract W-7405-Eng-48 (UCRL-JRNL-227703).

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Wenk, HR., Bortolotti, M., Barton, N. et al. Dauphiné twinning and texture memory in polycrystalline quartz. Phys Chem Minerals 34, 599–607 (2007).

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