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Journal of Materials Science

, Volume 43, Issue 23–24, pp 7397–7402 | Cite as

Property optimization of nanostructured ARB-processed Al by post-process deformation

  • X. HuangEmail author
  • N. Kamikawa
  • N. Hansen
Ultrafine-Grained Materials

Abstract

The effect of post-process deformation on the mechanical properties of nanostructured aluminum (99.2% purity) has been investigated by cold rolling of samples which have been processed by accumulative roll bonding (ARB) to a strain of εvM = 4.8. Samples have been cold rolled to 10, 15, and 50% reductions and ultimate tensile strength (UTS), yield stress and elongation have been determined by tensile testing at room temperature. The mechanical testing shows that cold rolling to low strains (10% and 15%) leads to softening and increase in elongation compared to the as-processed ARB material. In contrary, cold rolling to large strain (50%) results in significant strengthening. This leads to the suggestion of a transition strain within the range of 25–35% reduction by rolling. The microstructural evolution during post-process deformation has been followed by transmission electron microscopy showing a significant change in the dislocation structure when the strain is increased. Based on the experimental observations the mechanical behavior is related to the structural changes focusing on the characteristics of the dislocation structure present between the narrowly spaced lamellar boundaries in the deformed structure.

Keywords

Dislocation Density Cold Rolling Accumulative Roll Bonding High Angle Boundary Nanostructured Metal 

Notes

Acknowledgement

We acknowledge the Danish National Research Foundation for supporting the Center for Fundamental Research: Metal Structures in Four Dimensions, within which this work was performed.

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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 DenmarkRoskildeDenmark

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