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Annealing Behavior of Nanostructured Aluminum Produced by Cold Rolling to Ultrahigh Strains

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Abstract

The isochronal annealing behavior of nanostructured commercial purity aluminum (AA1100 and AA1200) produced by either cold rolling (CR) or accumulative roll bonding (ARB) up to ultrahigh strains of about 99.5 pct reduction in thickness has been studied in the temperature range from 200 °C to 420 °C. Microstructural and texture measurements were made using data from electron backscatter diffraction (EBSD) investigations, and the change in mechanical strength was followed using hardness measurements. A large effect of the rolling strain is observed on recovery at temperatures below 200 °C to 220 °C. This effect is exemplified by samples deformed to the largest strain, where a rapid decrease in the stored energy from approximately 2 MJ/m3 in the deformed state to less than 0.5 MJ/m3 is seen, accompanied by a large decrease in the hardness. A new method for analyzing the uniformity of the structural coarsening, based on analysis of the crystallite size distribution with respect to the mode, is described. The analysis demonstrates that annealing leads to locally nonuniform changes in the microstructure, and to a description of the annealing process at temperatures greater than 220 °C as one of conventional recrystallization.

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Acknowledgments

The authors acknowledge financial support from the Danish National Research Foundation to the Center for Fundamental Research: Metal Structures in Four Dimensions and from the National Natural Science Foundation of China (Contract No. 50351041). W. Pantleon is thanked for the initial suggestion of using the mode to analyze the crystallite size distribution. The authors also acknowledge valuable discussions with J.R. Bowen, R.D. Doherty, D. Juul Jensen, B. Ralph, and R.A. Vandermeer. The authors thank D. Lloyd for supplying the cold-rolled aluminum used in this study, N. Tsuji (Osaka University) for supplying the ARB samples, and Ms. Eva Nielsen for assistance with preparation of the manuscript.

Author information

Author notes

  1. W.Q. Cao (Postdoctoral Student, Postdoctoral Researcher)

    Present address: Department of Materials Engineering, Monash University, Clayton, 3800, Victoria, Australia

  2. Q. Liu (Professor)

    Present address: School of Materials Science and Engineering, Chongqing University, 400030, Chongqing, People’s Republic of China

Authors and Affiliations

  1. Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, Peoples Republic of China

    W.Q. Cao (Postdoctoral Student, Postdoctoral Researcher) & Q. Liu (Professor)

  2. Center for Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, Peoples Republic of China

    A. Godfrey (Professor)

  3. Center for Fundamental Research: Metal Structures in Four Dimensions, Risø DTU National Laboratory for Sustainable Energy, Roskilde, Denmark

    N. Hansen (Senior Scientist)

Authors
  1. W.Q. Cao
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  2. A. Godfrey
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  3. N. Hansen
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  4. Q. Liu
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Corresponding author

Correspondence to A. Godfrey.

Additional information

Manuscript submitted November 28, 2007.

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Cao, W., Godfrey, A., Hansen, N. et al. Annealing Behavior of Nanostructured Aluminum Produced by Cold Rolling to Ultrahigh Strains. Metall Mater Trans A 40, 204–214 (2009). https://doi.org/10.1007/s11661-008-9678-z

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  • DOI: https://doi.org/10.1007/s11661-008-9678-z

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