Resolving the geometrically necessary dislocation content in severely deformed aluminum by transmission Kikuchi diffraction
- Author
- Soroosh Naghdy (UGent) , Patricia Verleysen (UGent) , Roumen Petrov (UGent) and Leo Kestens (UGent)
- Organization
- Abstract
- In this paper, severe plastic deformation (SPD) is applied to commercially pure aluminum. Monotonic high pressure torsion (HPT) processing is employed at room temperature, and the microstructure of samples deformed up to an equivalent strain of 50 is investigated by electron backscatter diffraction (EBSD). The distribution pattern and the density of geometrically necessary dislocations (GNDs) are evaluated by examination of transmission Kikuchi diffraction (TKD) maps. Three different methodologies are utilized for assessment of the GND density. It was observed that two distinct stages of grain fragmentation and steady-state occur during processing. During the first stage, a severe grain refinement was observed as the average grain size decreased from similar to 85 mu m to similar to 1 mu m at an equivalent strain of 10. Quantification of the density of dislocations in both deformation regimes showed that, independent of the choice of model, the GND density is greater in the fragmentation stage than in the steady-state stage. This observation was linked with the prevalence of the continuous dynamic re crystallization (CDRX) phenomenon in each stage. Furthermore, a significant presence of GNDs in the steady-state stage was characterized. Formation of microstructure, grain refinement and saturation of grain size are discussed in the light of statistics of GNDs.
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Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-8559011
- MLA
- Naghdy, Soroosh, et al. “Resolving the Geometrically Necessary Dislocation Content in Severely Deformed Aluminum by Transmission Kikuchi Diffraction.” MATERIALS CHARACTERIZATION, vol. 140, 2018, pp. 225–32, doi:10.1016/j.matchar.2018.04.013.
- APA
- Naghdy, S., Verleysen, P., Petrov, R., & Kestens, L. (2018). Resolving the geometrically necessary dislocation content in severely deformed aluminum by transmission Kikuchi diffraction. MATERIALS CHARACTERIZATION, 140, 225–232. https://doi.org/10.1016/j.matchar.2018.04.013
- Chicago author-date
- Naghdy, Soroosh, Patricia Verleysen, Roumen Petrov, and Leo Kestens. 2018. “Resolving the Geometrically Necessary Dislocation Content in Severely Deformed Aluminum by Transmission Kikuchi Diffraction.” MATERIALS CHARACTERIZATION 140: 225–32. https://doi.org/10.1016/j.matchar.2018.04.013.
- Chicago author-date (all authors)
- Naghdy, Soroosh, Patricia Verleysen, Roumen Petrov, and Leo Kestens. 2018. “Resolving the Geometrically Necessary Dislocation Content in Severely Deformed Aluminum by Transmission Kikuchi Diffraction.” MATERIALS CHARACTERIZATION 140: 225–232. doi:10.1016/j.matchar.2018.04.013.
- Vancouver
- 1.Naghdy S, Verleysen P, Petrov R, Kestens L. Resolving the geometrically necessary dislocation content in severely deformed aluminum by transmission Kikuchi diffraction. MATERIALS CHARACTERIZATION. 2018;140:225–32.
- IEEE
- [1]S. Naghdy, P. Verleysen, R. Petrov, and L. Kestens, “Resolving the geometrically necessary dislocation content in severely deformed aluminum by transmission Kikuchi diffraction,” MATERIALS CHARACTERIZATION, vol. 140, pp. 225–232, 2018.
@article{8559011,
abstract = {{In this paper, severe plastic deformation (SPD) is applied to commercially pure aluminum. Monotonic high pressure torsion (HPT) processing is employed at room temperature, and the microstructure of samples deformed up to an equivalent strain of 50 is investigated by electron backscatter diffraction (EBSD). The distribution pattern and the density of geometrically necessary dislocations (GNDs) are evaluated by examination of transmission Kikuchi diffraction (TKD) maps. Three different methodologies are utilized for assessment of the GND density. It was observed that two distinct stages of grain fragmentation and steady-state occur during processing. During the first stage, a severe grain refinement was observed as the average grain size decreased from similar to 85 mu m to similar to 1 mu m at an equivalent strain of 10. Quantification of the density of dislocations in both deformation regimes showed that, independent of the choice of model, the GND density is greater in the fragmentation stage than in the steady-state stage. This observation was linked with the prevalence of the continuous dynamic re crystallization (CDRX) phenomenon in each stage. Furthermore, a significant presence of GNDs in the steady-state stage was characterized. Formation of microstructure, grain refinement and saturation of grain size are discussed in the light of statistics of GNDs.}},
author = {{Naghdy, Soroosh and Verleysen, Patricia and Petrov, Roumen and Kestens, Leo}},
issn = {{1044-5803}},
journal = {{MATERIALS CHARACTERIZATION}},
language = {{eng}},
pages = {{225--232}},
title = {{Resolving the geometrically necessary dislocation content in severely deformed aluminum by transmission Kikuchi diffraction}},
url = {{http://doi.org/10.1016/j.matchar.2018.04.013}},
volume = {{140}},
year = {{2018}},
}
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