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Strain distribution during tensile deformation of nanostructured aluminum samples

  • Ultrafine Grained Materials
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Abstract

To optimize the mechanical properties, especially formability, post-process deformation by cold rolling in the range 5–50 % reduction was applied to aluminum sheets produced by accumulative roll bonding to an equivalent strain of 4.8. During tensile testing high resolution maps of the strain distribution over the tensile sample gage length were obtained in situ using a commercial ARAMIS system. Significant improvements in total elongation from 6 to 13.3 % and in post-UTS uniform elongation from zero to 4.4 % were observed when introducing a post-process deformation step and the observations were underpinned by the in situ observations of the evolution of strain distribution in the sample during tensile straining. The mechanisms responsible for the enhancement were discussed based on strain rate sensitivity measurements and microstructural observations.

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Acknowledgements

The authors gratefully acknowledge the 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. JK and LL gratefully acknowledge Yang Le and Jinglong Wen for their technical help with the ARAMIS experiments at Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences.

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Authors and Affiliations

  1. Danish-Chinese Center for Nanometals, Material Science and Advance Characterization Section, Department of Wind Energy, Technical University of Denmark, Risø Campus, 4000, Roskilde, Denmark

    J. Kidmose, N. Hansen & X. Huang

  2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, People’s Republic of China

    L. Lu

  3. Department of Mechanical Engineering, Technical University of Denmark, 2800, Kgs. Lyngby, Denmark

    G. Winther

Authors
  1. J. Kidmose
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  2. L. Lu
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  3. G. Winther
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  4. N. Hansen
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  5. X. Huang
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Corresponding author

Correspondence to J. Kidmose.

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Kidmose, J., Lu, L., Winther, G. et al. Strain distribution during tensile deformation of nanostructured aluminum samples. J Mater Sci 47, 7901–7907 (2012). https://doi.org/10.1007/s10853-012-6718-2

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  • DOI: https://doi.org/10.1007/s10853-012-6718-2

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