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Journal of Materials Science

, Volume 43, Issue 23–24, pp 7313–7319 | Cite as

Tailoring structures through two-step annealing process in nanostructured aluminum produced by accumulative roll-bonding

  • Naoya Kamikawa
  • Xiaoxu HuangEmail author
  • Niels Hansen
Ultrafine-Grained Materials

Abstract

Due to structural and textural heterogeneities and a high content of stored energy, annealing of nanostructured metals is difficult to control in order to avoid non-uniform coarsening and recrystallization. The present research demonstrates a method to homogenize the structure by annealing at low temperature before annealing at high temperature. By this two-step process, the structure is homogenized and the stored energy is reduced significantly during the first annealing step. As an example, high-purity aluminum has been deformed to a total reduction of 98.4% (equivalent strain of 4.8) by accumulative roll-bonding at room temperature. Isochronal annealing for 0.5 h of the deformed samples shows the occurrence of recrystallization at 200 °C and above. However, when introducing an annealing step for 6 h at 175 °C, no significant recrystallization is observed and relatively homogeneous structures are obtained when the samples afterwards are annealed at higher temperatures up to 300 °C. To underpin these observations, the structural evolution has been characterized by transmission electron microscopy, showing that significant annihilation of high-angle boundaries, low-angle dislocation boundaries, and dislocations characterizes the low-temperature annealing step. In a discussion, the observed annealing behavior is related to these structural changes.

Keywords

Misorientation Angle Nanostructured Metal Boundary Spacing Structural Coarsening EBSD Measurement 

Notes

Acknowledgements

The authors gratefully acknowledge the Danish National Research Foundation for supporting the Center for Fundamental Research: Metal Structures in Four Dimension, within which this work was performed. The authors also thank Prof. B. Ralph for useful comments and language correction.

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Center for Fundamental Research: Metal Structures in Four Dimensions, Materials Research Department, Risø National Laboratory for Sustainable EnergyTechnical University of Denmark (Risø DTU)RoskildeDenmark

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