Investigating the Influence of Cold Rolling on Precipitation in Industrial AA2024 using Advanced Microscopy Techniques - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2023

Investigating the Influence of Cold Rolling on Precipitation in Industrial AA2024 using Advanced Microscopy Techniques

Mohamed Sennour
Lisa T. Belkacemi
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Vladimir A. Esin

Résumé

Precipitation hardened aluminium alloys are widely used for various applications due to their properties, such as low density to strength ratio and high corrosion resistance. AA2024 is a commonly used aluminium alloy in the aerospace industry with a quite simple precipitation sequence including co-cluster and Guinier-Preston-Baragyatski (GPB) zone formation during natural ageing and precipitation of the equilibrium S-phase (Al2CuMg) during artificial ageing [1]. This study aims to investigate the influence of pre-deformation by cold rolling (CR) on subsequent precipitation during artificial ageing in industrial AA2024. Electron backscatter diffraction (EBSD) was used to analyse the deformation microstructure focusing on the arrangement of dislocation substructures. Atom probe tomography (APT) and differential scanning calorimetry (DSC) were used to characterize co-clusters in naturally aged AA2024-T3, showing that they are destroyed during cold rolling and not reconstituted during subsequent natural ageing. Precipitates evolution during artificial ageing of cold-rolled (CR) samples was investigated by transmission electron microscopy (TEM). Hence, although heteregenous nucleation on dislocation was observed, the precipitates appear with a spacially homogeneous distribution at peak hardness (Fig. 1). Dark-field imaging and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) tomography were performed to study the size distribution and three-dimensional arrangement of the S-phase precipitates. A refinement of precipitates in the preveously cold-rolled samples was observed, connected to changes in the aspect ratio of precipiates. The study demonstrates how advanced microscopy techniques contribute to understanding of microstructural changes and precipitation behaviour in aluminium alloys and therefore contribute to the development of novel production processes.

Domaines

Matériaux
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Dates et versions

hal-04354409 , version 1 (19-12-2023)

Identifiants

  • HAL Id : hal-04354409 , version 1

Citer

Daniel Irmer, Mohamed Sennour, Lisa T. Belkacemi, Vladimir A. Esin, Charbel Moussa. Investigating the Influence of Cold Rolling on Precipitation in Industrial AA2024 using Advanced Microscopy Techniques. XVIIIème colloque de la Société Française des Microscopies, Jul 2023, Rouen, France. ⟨hal-04354409⟩
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