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| Naji, M. |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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Theissing, Moritz
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Publications (6/6 displayed)
- 2024Modeling the concurrent growth of inter- and intragranular Si precipitates during slow cooling of the alloy AA6016
- 2024How to properly investigate recrystallization in wrought aluminum alloys
- 2024Investigation of the texture development of rolled aluminum alloy sheets during constant heating using in situ EBSD
- 2024Recrystallization in Wrought Aluminum Alloys - A Critical Evaluation of Characterization Methods
- 2023Microstructural evolution in cold rolled aluminum alloys during recrystallization – an in situ electron backscatter diffraction study
- 2023Investigation of recrystallization processes in aluminum alloys - in situ electron backscatter diffraction optimized for annealing at constant heating rates
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document
Microstructural evolution in cold rolled aluminum alloys during recrystallization – an in situ electron backscatter diffraction study
Abstract
Understanding recrystallization processes is central to determining the properties of wrought alloys.<br/>To characterize this process in situ electron backscatter diffraction (EBSD) was used and optimized<br/>to measure the microstructural changes during heating at constant rates and isothermal annealing.<br/>The number of individual measurements during recrystallization is of central importance for a sufficient evaluation of its kinetics. To this end, the acquisition parameters and evaluation strategy of<br/>the EBSD scans have been optimized and improved, allowing heating rates of up to 10 K/min for continuous heating experiments and 90 K/min to reach the set isothermal temperature with the current<br/>equipment. The recrystallization behavior of cold-rolled aluminum alloys was studied by the method<br/>described. The so-called Avrami curves, the kinetic curves of recrystallization, are extracted from<br/>the EBSD data and their dependence on heating rate, annealing temperature, deformation state and<br/>alloy is presented. To account for potential concurrent precipitation, the precipitation state was investigated with scanning electron microscopy and energy dispersive X-ray spectroscopy before and<br/>after the annealing treatment. In addition, the Johnson-Mehl-Avrami-Kolmogorow (JMAK) model<br/>is used to evaluate recrystallization kinetics, and the limitations of the model are discussed. Further<br/>evaluation analyzed the evolution of texture with special attention to the cube component during<br/>the recrystallization process, which showed preferential nucleation at the beginning of recrystallization for one alloy. In order to compare the in situ results with more conventional methods for<br/>determining recrystallization, a series of isothermally annealed samples were prepared and analyzed<br/>with hardness measurements and ex situ EBSD.<br/>