We describe the use of a third generation synchrotron facility to obtain in situ, real-time, x-ray diffraction measurements in plate impact experiments. Subnanosecond duration x-ray pulses were utilized to record diffraction data from pure and magnesium-doped LiF single crystals shocked along the [111] and [100] orientations. The peak stresses were 3.0 GPa for the [111] oriented LiF and between 3.0 and 5.0 GPa for the [100] oriented LiF. For these stresses, shock compression along [111] results in elastic deformation and shock compression along [100] results in elastic-plastic deformation. Because of the quality of the synchrotron x-ray pulses, both shifting and broadening of the diffraction data were obtained simultaneously. As expected, shifts for elastic compression and elastic-plastic compression in shocked LiF were consistent with uniaxial and isotropic lattice compression, respectively. More importantly, diffraction patterns from crystals shocked along [100] exhibited substantial broadening due to elastic-plastic deformation. The broadening indicates that the shocked LiF(100) crystals developed substructure with a characteristic size for coherently diffracting domains and a distribution of (100) microlattice-plane rotations ( wide). In contrast to the LiF(100) results, broadening of the diffraction pattern did not occur for elastically deformed LiF(111). Another important finding was that the amount of lattice disorder for shocked LiF(100) depends on the loading history; the broadening was larger for the magnesium-doped LiF(100) (large elastic precursor) than for ultrapure LiF(100) (small elastic precursor) shocked to the same peak stress. The data are simulated by calculating the diffraction pattern from LiF(100) with a model microstructure consisting of coherently diffracting domains. The lattice orientation and longitudinal strain is assumed uniform within domains, but they vary from domain to domain with Gaussian distributions. Simulations using such a model are in good agreement with the measured diffraction patterns. The principal finding from the present work is that synchrotron x-rays can provide real-time data regarding microstructure changes accompanying shock-induced deformation and structural changes.
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1 March 2009
Research Article|
March 12 2009
Real-time microstructure of shocked LiF crystals: Use of synchrotron x-rays
Stefan J. Turneaure;
Stefan J. Turneaure
a)
1Institute for Shock Physics and Department of Physics,
Washington State University
, Pullman, Washington 99164, USA
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Y. M. Gupta;
Y. M. Gupta
1Institute for Shock Physics and Department of Physics,
Washington State University
, Pullman, Washington 99164, USA
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K. Zimmerman;
K. Zimmerman
1Institute for Shock Physics and Department of Physics,
Washington State University
, Pullman, Washington 99164, USA
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K. Perkins;
K. Perkins
1Institute for Shock Physics and Department of Physics,
Washington State University
, Pullman, Washington 99164, USA
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C. S. Yoo;
C. S. Yoo
2Institute for Shock Physics and Department of Chemistry,
Washington State University
, Pullman, Washington 99164, USA
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G. Shen
G. Shen
3HPCAT and HPSynC, Geophysical Laboratory,
Carnegie Institution of Washington
, Argonne, Illinois 60437, USA
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Stefan J. Turneaure
1,a)
Y. M. Gupta
1
K. Zimmerman
1
K. Perkins
1
C. S. Yoo
2
G. Shen
3
1Institute for Shock Physics and Department of Physics,
Washington State University
, Pullman, Washington 99164, USA
2Institute for Shock Physics and Department of Chemistry,
Washington State University
, Pullman, Washington 99164, USA
3HPCAT and HPSynC, Geophysical Laboratory,
Carnegie Institution of Washington
, Argonne, Illinois 60437, USA
a)
Electronic mail: [email protected].
J. Appl. Phys. 105, 053520 (2009)
Article history
Received:
November 03 2008
Accepted:
January 09 2009
Citation
Stefan J. Turneaure, Y. M. Gupta, K. Zimmerman, K. Perkins, C. S. Yoo, G. Shen; Real-time microstructure of shocked LiF crystals: Use of synchrotron x-rays. J. Appl. Phys. 1 March 2009; 105 (5): 053520. https://doi.org/10.1063/1.3080176
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