Dataset
HR-EBSD Measurements near Twins in Zicaloy-2
- Documentation:
- HR-EBSD measurements made on a Zircaloy-2 sample deformed to 2.7% in tension to generate multiple deformation twins. HR-EBSD measurements were made using A Bruker HReFlash detector mounted on a Zeiss Merlin SEM. Sample preparation used Ar ion beam milling on a Gatan PECS II system as a final step. The strain, stress and dislocation density variations available here were then calculated using in-house Matlab code (XEBSD) described in the following publications: High resolution electron backscatter diffraction measurements of elastic strain variations in the presence of larger lattice rotations TB Britton and AJ Wilkinson Ultramicroscopy, (2012), vol. 114, 82-95 doi:10.1016/j.ultramic.2012.01.004 Measurement of residual elastic strain and lattice rotations with high resolution electron backscatter diffraction TB Britton and AJ Wilkinson Ultramicroscopy, (2011) vol. 111, 1395-1404 doi:10.1016/j.ultramic.2011.05.007 Determination of elastic strain fields and geometrically necessary dislocation distributions near nanoindents using electron back scatter diffraction AJ Wilkinson and D Randman Philosophical Magazine, (2010), vol. 90, 1159-1177 doi:10.1080/14786430903304145 Crystal Plasticity Analysis of Micro-Deformation, Lattice Rotation and Geometrically Necessary Dislocation Density FPE Dunne, R Kiwanuka, AJ Wilkinson Proc. Royal Society A, (2012), vol. 468, 2509-2531 doi:10.1098/rspa.2012.0050 Stress fields close to twin tips and the associated local neighbourhoods of a hexagonal close-packed (HCP) polycrystal were studied in details. For this purpose, a coarse grain textured Zircaloy-2 sample was firstly strained uniaxially in a macroscopic direction that favours tensile twin formation. The sample was then unloaded and residual elastic strains and lattice rotations measured using the high-resolution electron backscatter diffraction (HR-EBSD) technique. Measured elastic strain maps of various clusters of grains including parent and twin pairs were then analysed. Stress, dislocation density, and their associated concentrations close to twin tips, within twins, in the immediate neighbouring grain, at the intersection of two twins, and within parent grains were investigated. It is shown that the stress field at the twin tips varies as a function of local neighbourhood. High stress, lattice rotation, and dislocation density concentrations were generally observed close to twin tips both within twins and within the immediate neighbouring grains. It is shown dislocation density concentration is maximum at the intersection of two twins which can potentially provide susceptible site for crack nucleation.
- Version:
- 1
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Authors
Contributors
+ Wilkinson, A
- Department:
- University of Oxford
- Role:
- Principal Investigator (PI)
+ Abdolvand, H
- Department:
- University of Oxford
- Role:
- Researcher
- Publisher:
- University of Oxford
- Publication date:
- 2015
- Version number:
- 1
- DOI:
- Data collected:
- 2014 - 2015
- Language:
-
English
- Keywords:
- Subjects:
- Pubs id:
-
1480211
- UUID:
-
uuid:3db02108-5fef-4823-b366-9c0161994a93
- Local pid:
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pubs:1480211
- Deposit date:
-
2015-11-28
- ARK identifier:
Terms of use
- Copyright date:
- 2015
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