By A Erman Tekkaya; Nooman Ben Khalifa
Read or Download Advances on hot extrusion and simulation of light alloys : selected, peer reviewed papers from the International Conference on Extrusion and Benchmark (ICEB), Dortmund 2009, Germany, September 16.-17. 2009 PDF
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Additional info for Advances on hot extrusion and simulation of light alloys : selected, peer reviewed papers from the International Conference on Extrusion and Benchmark (ICEB), Dortmund 2009, Germany, September 16.-17. 2009
For HSFE materials such as aluminum the evolution of microstructure is explained with continuous (cDRX) and geometric (gDRX) dynamic recrystallization and the dynamic recovery (DRV) theories in the literature. The DRV theory is described in [4, 5] by McQueen et al.. The subgrains have a constant size during forming, and the wall and internal dislocation densities are also constant. While the grains 36 Advances on Hot Extrusion and Simulation of Light Alloys are elongated, the subgrains are still equiaxed, this leads to an increasing length of high angle boundaries and that the subgrains are continually rearranged.
Key Engineering Materials Vol. 424 41 Acknowledgments This work was carried out with the financial support of the Researcher Group 922 (FOR 922), funded by the German Research Foundation (DFG). This support is greatly acknowledged. References  E. D. : Effects of Extrusion Parameters on Coarse Grain Surfache Layer in 6xxx Series Extrusions, ET 2004;  M. Schikorra, L. Donati, L. E. Tekkaya: Microstructure analysis of aluminum extrusion: Prediction of microstructure on AA6060 alloy, Journal of Materials Processing Technology, Volume 201 (2008), pp.
The quenched sample exhibits a distinct subgrain structure with high stored deformation energy, coarse elongated grains and small subgrains whereas the air cooled sample shows a coarsened subgrain structure and new formed high angle grain boundaries during static recrystallization. Key Engineering Materials Vol. 424 (a) 33 (b) Fig. 5: Grain structure EBSD image of the AA6082 according to different post treatments: (a) Water quenched and (b) air cooled sample after the extrusion process. The influene of static recrystallization can be clearly seen.
Advances on hot extrusion and simulation of light alloys : selected, peer reviewed papers from the International Conference on Extrusion and Benchmark (ICEB), Dortmund 2009, Germany, September 16.-17. 2009 by A Erman Tekkaya; Nooman Ben Khalifa