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In Situ EBSD Investigation of Recrystallization in a Partially Annealed and Cold-Rolled Aluminum Alloy of Commercial Purity

Authors

  • Anne-Laure Helbert,

    Corresponding author
    1. Université Paris-Sud, UMR8182, ICMMO Laboratoire de Physico-Chimie de l'Etat Solide, Orsay F-91405, (France)
    2. CNRS, Orsay F-91405, (France)
    • Université Paris-Sud, UMR8182, ICMMO Laboratoire de Physico-Chimie de l'Etat Solide, Orsay F-91405, (France)
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  • Wei Wang,

    1. Université Paris-Sud, UMR8182, ICMMO Laboratoire de Physico-Chimie de l'Etat Solide, Orsay F-91405, (France)
    2. CNRS, Orsay F-91405, (France)
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  • François Brisset,

    1. Université Paris-Sud, UMR8182, ICMMO Laboratoire de Physico-Chimie de l'Etat Solide, Orsay F-91405, (France)
    2. CNRS, Orsay F-91405, (France)
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  • Thierry Baudin,

    1. Université Paris-Sud, UMR8182, ICMMO Laboratoire de Physico-Chimie de l'Etat Solide, Orsay F-91405, (France)
    2. CNRS, Orsay F-91405, (France)
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  • Richard Penelle

    1. Université Paris-Sud, UMR8182, ICMMO Laboratoire de Physico-Chimie de l'Etat Solide, Orsay F-91405, (France)
    2. CNRS, Orsay F-91405, (France)
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  • The authors would like to thank F. R. Boutin (previously Research Director in Alcan society) for providing samples and also for the fruitful discussions.

Abstract

The microstructure of partially annealed and additionally rolled 1050 aluminum alloy of commercial purity was monitored using FEG/EBSD in situ heating experiments in order to understand the preferential growth of Cube-oriented grains. A fast reorganization of the deformation sub-structure of Cube and S1{214} <-1-21> grains has been observed by sub-grain growth that consists in a continuous recrystallization mechanism. This occurs as the main recrystallization mechanism at the beginning of the annealing but soon competes with a preferential Cube growth by Strain Induced Boundary Migration (SIBM). An EBSD pattern Image Quality (IQ) analysis attested that Cube grains store less energy than non-Cube oriented grains. TEM observations allowed studying the effect of the additional rolling on the deformation sub-structures depending on the crystallographic orientation. It appears that Cube grains close to the exact orientation contain isolated dislocations and that rotated Cube grains (with 15° spread to the exact orientation) are composed of dislocation cells with thin walls. At the opposite, non-Cube grains are organized in sub-grains with thicker walls and rich in dislocations. Finally, this difference of sub-structure associated to an energy difference between Cube and non-Cube grains explains the preferential Cube growth by SIBM evidenced by the sequence of in situ scans during heating.

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