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Evolution of Microstructure and Texture during Annealing of Aluminum AA1050 Cold Rolled to High and Ultrahigh Strains

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Abstract

The microstructure and texture of commercial purity aluminum (AA1050) have been investigated after cold rolling to von Mises strains of 3.6 to 6.4 followed by recovery and recrystallization during annealing. The evolution of structural parameters of the deformed microstructure, such as boundary spacing and fraction of high-angle boundaries (HABs), did not reach saturation in the given strain range. Recovery was accompanied by structural coarsening and by a decrease in the fraction of HABs. The coarsening rate increased with increasing strain prior to annealing. Recrystallization nuclei were found to form both in deformation zones around coarse particles and in recovered lamellar structures. The process of recrystallization in the present material can thus be characterized as discontinuous recrystallization. In recrystallized conditions, the average grain size was related to the grain orientation: the mean size of grains having orientations of the rolling texture was smaller than the size of grains with other orientations. The orientation dependence of the recrystallized grain size was more pronounced in the samples rolled to ultrahigh strains.

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Acknowledgments

The authors gratefully acknowledge support from the Danish National Research Foundation and the National Natural Science Foundation of China (Grant No. 50911130230) for the Danish-Chinese Center for Nanometals, within which this work was performed. The authors are grateful to Professor A. Godfrey, Dr. J.R. Bowen, and Dr. H.-E. Ekström for useful discussions and comments on the manuscript. Dr. S. Van Boxel is acknowledged for providing the software for plotting ODFs from the EBSD data.

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Authors and Affiliations

  1. Danish-Chinese Center for Nanometals, Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, DK-4000, Roskilde, Denmark

    O.V. Mishin (Senior Scientist), D. Juul Jensen (Head of Division) & N. Hansen (Senior Scientist)

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  1. O.V. Mishin
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  2. D. Juul Jensen
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  3. N. Hansen
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Correspondence to O.V. Mishin.

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Manuscript submitted December 1, 2009.

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Mishin, O., Juul Jensen, D. & Hansen, N. Evolution of Microstructure and Texture during Annealing of Aluminum AA1050 Cold Rolled to High and Ultrahigh Strains. Metall Mater Trans A 41, 2936–2948 (2010). https://doi.org/10.1007/s11661-010-0291-6

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