Abstract
The annealing kinetics of cold-rolled AA5182 and AA5657 aluminum alloy sheets have been investigated and compared. The microstructures of a series of partially recrystallized samples are characterized by electron back scattered diffraction and key stereological parameters including volume fraction recrystallized, interfacial areas and contiguity are determined. The overall recrystallization kinetics as well as the nucleation and growth rates are thereby quantified. The results reveal that the nuclei develop in clusters. This matches well with the observation of a low kinetics exponent n = 2 in AA5182. Much more surprising is that n is 2.8 in AA5657, even though the nucleation is clustered. Also, it is higher than almost all recrystallization kinetics investigations which generally find values significantly below 3. Effects of nucleation rate, spatial distribution of nuclei and growth rate are discussed and used in a quantitative analysis of recrystallization kinetics in the two alloys.
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26 November 2021
A Correction to this paper has been published: https://doi.org/10.1007/s11661-021-06537-6
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Acknowledgments
This research is funded by the National Natural Science Foundation of China (Grant Nos. 51421001, 51571046), and the Project No. 2020CDJDCL001 supported by the Fundamental Research Funds for the Central Universities. Furthermore, we appreciate the support from the 111 Project (B16007) by the Ministry of Education and the State Administration of Foreign Experts Affairs of China. FXL and DJJ acknowledge the funding from the European Research Council (ERC Grant Agreement No. 788567 M4D) which had covered our part of this work. RES acknowledges the materials supported from Novelis and XCL acknowledges the help of TEM samples preparation from YCQ.
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Backscatter electron (BSE) images of ex situ AA5182 with (a) and (c) as-rolled state and (b) and (d) annealing for 300 minutes at 245 °C, and AA5657 with (e) as-recovered state and (f) annealed for 80 min at 300 °C. Some tiny precipitated dispersoids are marked in yellow dotted box in (b) and (d). TEM micrograph of (g) AA5182 with annealing for 360 min at 245 °C, EDS map**s of the particles marked in (g) are shown in (h) and some tiny precipitated dispersoids along RD are mainly Mn-containing (Color figure online)
1.2 Comparison of Nuclei Density and Extended Nuclei Density
The extended nuclei density \({N}_{\text{Vex}}\) is the imaginary nuclei density found when nucleation is assumed to occur both in unrecrystallized and in already recrystallized regions. It can be calculated as the integral of the nucleation rate \(\dot{N}\) over time. The real nuclei density NV includes only nucleation in the unrecrystallized regions and thus there is a need to exclude any nucleation within the recrystallized regions. If the nuclei are randomly distributed, the possibility that a nucleus is located in unrecrystallized regions is proportional to the volume fraction of the unrecrystallized material, 1 − VV. Thus, the real nucleation rate, \({\text{d}}{N}_{V}/{\text{d}}t\), equals to \(\dot{N}(1-{V}_{V})\).
If \(\dot{N}\) and VV are expressed as follows:
\({N}_{\text{Vex}}\) and NV can be written as:
The second integral is not straight forward to solve analytically, but can be calculated numerically. The values of N1, δ, B and n determined from the slopes and intercepts of the fitted lines in Figures 10(c) and (d) and Figures 5(a) and (b) are used in Eqs. [A3] and [A4] to find the differences between \({N}_{Vex}\) and NV for the two alloys studied in this work. As shown in Figure A2, it is seen that the differences between the calculated \({N}_{V{\text{ex}}}\) (dashed red lines) and NV (solid blue curves) are not significant before 600 minutes for AA5182 and 120 minutes for AA5657, which correspond to recrystallization fraction of around 70 pct for both alloys.
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Lei, X., Sanders, R.E., Yang, X. et al. Quantitative Comparison of the Recrystallization Kinetics of Two Industrially Processed 5xxx Aluminum Alloys. Metall Mater Trans A 52, 4827–4840 (2021). https://doi.org/10.1007/s11661-021-06427-x
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DOI: https://doi.org/10.1007/s11661-021-06427-x