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- Title
Basis for the Bauschinger effect in copper single crystals: changes in the long-range internal stress with reverse deformation.
- Authors
Levine, L. E.; Stoudt, M. R.; Creuziger, A.; Phan, T. Q.; Xu, Ruqing; Kassner, M. E.
- Abstract
The long-range internal stresses (LRIS) associated with the Bauschinger effect were investigated using synchrotron X-ray microbeam diffraction and reversed deformation experiments. [100]-oriented Cu single crystals were deformed in compression to approximately − 0.3 true strain, followed by tension to a strain of approximately + 0.02. Two conclusions are arrived at from this work: First, the LRIS are confirmed in this work to be small relative to the applied stress both before and after reversal. Second, the LRIS persist after 2% reversed strain despite a significant drop in the overall dislocation density by dynamic recovery. This appears to satisfy the necessary condition for LRIS to significantly contribute to a Bauschinger effect in materials. The pronounced Bauschinger effect in Cu is probably best rationalized by a combination of both the LRIS and the Orowan-Sleeswyk model that relies on a non-uniform distribution of dislocation obstacles without a substantial LRIS.
- Subjects
BAUSCHINGER effect; STRESS-strain curves; RESIDUAL stresses; SYNCHROTRONS; X-ray diffraction; DEFORMATIONS (Mechanics)
- Publication
Journal of Materials Science, 2019, Vol 54, Issue 8, p6579
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-018-03295-6