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Title: Mesoscale Plastic Deformation in the Shock Recovered Metals from White Beam Diffraction

Abstract

Copper has been the object of numerous shock experiments. Recently developed in-situ time resolved x-ray diffraction relates in-situ pseudo Kossel line broadening with dislocation density during the shock experiments [Loveridge-Smith 2001, Kalantar 2003,]. After shock structure in the Cu single crystal studied by TEM reveals severe deformation and twinning in the (200) shock compressed Cu single crystals [Meyers 2003]. We complement these results with white (polychromatic) X-ray microbeam study of the after shock dislocation microstructure in the (200) Cu single crystal. During uniaxial compression by strong shock waves, metals undergo a transition from elastic compression to plastic compression. The nature of this plastic compression has been of considerable interest since the time of C.S. Smith. However, a detailed understanding has been inhibited by the need to examine soft recovered samples. White microbeam X-ray diffraction offers the prospect of quantifying the shock induced anisotropic plastic state in materials. The disorder created at the shock front leads to significant scattering surrounding the Bragg peaks. Analysis of these scattering results gives a measure of dislocation density and local lattice rotation. We have measured polychromatic X-ray microdiffraction from shock recovered samples of Cu single crystals at the Advanced Photon Source. The density and organizationmore » of dislocations will be presented as well as comparison to SEM and OIM on the same samples.« less

Authors:
 [1];  [1];  [2];  [2];  [2];  [2];  [3];  [4]
  1. ORNL
  2. Lawrence Livermore National Laboratory (LLNL)
  3. University of Bremen, Bremen, Germany
  4. Clarendon Laboratory, United Kingdom
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1003524
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: Proceedings of Plasticity '06 The Twelvth International Symposium on Plasticity and Its Current Applications, Halifax, Canada, 20060717, 20060722
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ADVANCED PHOTON SOURCE; BRAGG CURVE; COMPRESSION; COPPER; DEFORMATION; DIFFRACTION; DISLOCATIONS; LINE BROADENING; MICROSTRUCTURE; MONOCRYSTALS; PLASTICITY; PLASTICS; ROTATION; SCATTERING; SHOCK WAVES; TWINNING; X-RAY DIFFRACTION

Citation Formats

Barabash, Rozaliya, Ice, Gene E, Belak, J., Campbell, G., Kumar, M., Lorenzana, H., Figge, S., and Wark, J. Mesoscale Plastic Deformation in the Shock Recovered Metals from White Beam Diffraction. United States: N. p., 2006. Web.
Barabash, Rozaliya, Ice, Gene E, Belak, J., Campbell, G., Kumar, M., Lorenzana, H., Figge, S., & Wark, J. Mesoscale Plastic Deformation in the Shock Recovered Metals from White Beam Diffraction. United States.
Barabash, Rozaliya, Ice, Gene E, Belak, J., Campbell, G., Kumar, M., Lorenzana, H., Figge, S., and Wark, J. Sun . "Mesoscale Plastic Deformation in the Shock Recovered Metals from White Beam Diffraction". United States. doi:.
@article{osti_1003524,
title = {Mesoscale Plastic Deformation in the Shock Recovered Metals from White Beam Diffraction},
author = {Barabash, Rozaliya and Ice, Gene E and Belak, J. and Campbell, G. and Kumar, M. and Lorenzana, H. and Figge, S. and Wark, J.},
abstractNote = {Copper has been the object of numerous shock experiments. Recently developed in-situ time resolved x-ray diffraction relates in-situ pseudo Kossel line broadening with dislocation density during the shock experiments [Loveridge-Smith 2001, Kalantar 2003,]. After shock structure in the Cu single crystal studied by TEM reveals severe deformation and twinning in the (200) shock compressed Cu single crystals [Meyers 2003]. We complement these results with white (polychromatic) X-ray microbeam study of the after shock dislocation microstructure in the (200) Cu single crystal. During uniaxial compression by strong shock waves, metals undergo a transition from elastic compression to plastic compression. The nature of this plastic compression has been of considerable interest since the time of C.S. Smith. However, a detailed understanding has been inhibited by the need to examine soft recovered samples. White microbeam X-ray diffraction offers the prospect of quantifying the shock induced anisotropic plastic state in materials. The disorder created at the shock front leads to significant scattering surrounding the Bragg peaks. Analysis of these scattering results gives a measure of dislocation density and local lattice rotation. We have measured polychromatic X-ray microdiffraction from shock recovered samples of Cu single crystals at the Advanced Photon Source. The density and organization of dislocations will be presented as well as comparison to SEM and OIM on the same samples.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}

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  • Strong shock waves result in the transition from elastic to plastic compression. Regions with voids and geometrically necessary dislocations are formed causing local lattice curvature. A spatially resolved diffraction method with a sub micrometer-diameter beam and 3D differential aperture technique is applied to understand the arrangements of voids, geometrically necessary dislocations and the elastic strain gradient distribution in samples of Al (123) single crystal shocked to incipient spallation fracture.
  • Strong shock waves result in the transition from elastic to plastic compression. As a result of dislocation motion and the strong interaction between dislocations and elastic waves, an initially random dislocation distribution becomes unstable and forms a correlated dislocation arrangement into dislocation walls. Some fraction of the dislocations may remain randomly distributed, and the rest form various correlated groupings and more organised disclination arrangements. Regions with geometrically necessary dislocations may form causing local lattice curvature. Aluminum has been the object of numerous shock experiments. Reshock and release of shock - compressed aluminum was studied previously by Lipkin and Asay1. Recentlymore » developed in-situ time resolved x-ray diffraction relates in-situ pseudo Kossel line broadening with dislocation density during the shock experiments2 - 4. Effect of stress triaxiality on void growth in dynamic fracture of metals was studied with molecular dynamic simulations5. We complement these results with white (polychromatic) X-ray microbeam study of the meso-scale geometrically necessary dislocation arrangement in the (123) Al single crystal. The single crystal Al samples were shocked to incipient spallation fracture on the LLNL light gas gun as was done by Stevens et.al. A spatially resolved diffraction method with a sub micrometer-diameter beam and 3D differential aperture technique together with MD simulations, SEM and OIM analysis are applied to understand the arrangements of voids, geometrically necessary dislocations and strain gradient distribution in samples of Al (123) single crystal shocked to incipient spallation fracture. We describe how geometrically necessary dislocations and effective strain gradient alter white beam Laue patterns of the shocked materials. We show how to quantitatively determine the orientation and density of geometrically necessary dislocations in the shock recovered Al samples being initially oriented for single slip.« less
  • A spatially resolved diffraction method with a sub micrometer-diameter beam and 3D differential aperture technique together with MD simulations, SEM and OIM analysis are applied to understand the arrangements of voids, geometrically necessary dislocations and strain gradient distribution in samples of Al (123) single crystal shocked to incipient spallation fracture. We describe how geometrically necessary dislocations and effective strain gradient alter white beam Laue patterns of the shocked materials. We show how to quantitatively determine the orientation and density of geometrically necessary dislocations in the shock recovered Al samples being initially oriented for single slip.
  • The magnitude and distribution of elastic strain for a nickel alloy 600 (A600) sample that had been subjected to uniaxial tensile stress were measured by micro Laue diffraction (MLD) and neutron diffraction techniques. For a sample that had been dimensionally strained by 1%, both MLD and neutron diffraction data indicated that the global residual elastic strain was on the order of 10{sup -4}, however the micro-diffraction data indicated considerable grain-to-grain variability amongst individual components of the residual strain tensor. A more precise comparison was done by finding those grains in the MLD map that had appropriate <hkl> oriented in themore » specific directions matching those used in the neutron measurements and the strains were found to agree within the uncertainty. Large variations in strain values across the grains were noted during the MLD measurements which are reflected in the uncertainties. This is a possible explanation for the large uncertainty in the average strains measured from multiple grains during neutron diffraction.« less
  • Niobium films of thickness 1, 2.5, 5, and 10 {mu}m were subjected to shock pressures of 0.72 and 0.97 Mbar. The recovery technique and the results of microstructural investigations of the recovered films are described. 2 refs., 1 fig.