Mesoscale Plastic Deformation in the Shock Recovered Metals from White Beam Diffraction
- ORNL
- Lawrence Livermore National Laboratory (LLNL)
- University of Bremen, Bremen, Germany
- Clarendon Laboratory, United Kingdom
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.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 1003524
- 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
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