Shock induced deformation substructures in a copper bicrystal
- Los Alamos National Laboratory
- NON LANL
Controlled shock recovery experiments have been conducted to assess the role of shock pressure and orientation dependence on the substructure evolution of a [100]/[01{ovr 1}] copper bicrystal. Electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) were utilized to characterize orientation variation and substructure evolution of the post-shock specimens. Well defined dislocation cell structures were displayed in both grains and the average cell size was observed to decrease with increasing shock pressure. Twinning was occasionally observed in the 5 GPa shocked [100] grain and became the dominant substructure at higher shock pressure. The stress and directional dependence of twinning in the bicrystal was analyzed with consideration of the energetically favorable dissociation of dislocations into Shockley partials and the stress-orientation effect on the partial width. Moreover, a critical 'tear apart' stress is proposed and a good agreement is obtained between the calculated value and the experimental observations.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC52-06NA25396
- OSTI ID:
- 960480
- Report Number(s):
- LA-UR-08-04977; LA-UR-08-4977; ACMAFD; TRN: US201006%%1148
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia; ISSN 1359-6454
- Country of Publication:
- United States
- Language:
- English
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Orientation dependence of shock-induced twinning and substructures in a copper bicrystal
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