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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
To predict recrystallization, the 3IVM is coupled with a model describing static recrystallization . If the stored deformation energy increases by generating dislocations and if the dislocation density gradient exceeds a critical value at preferential locations like grain boundaries, triple junctions or particles (>1µm), the material starts to recrystallize. Physical based microstructure model. For a realistic description of the microstructure evolution during the process and final state, physical based models are adequate that consider dislocations, subgrain boundaries, precipitations and their interactions.
Mitsche2, c, S. Randjelovic3, d and C. at Keywords: AA6082, hot extrusion, FEM, microstructure modelling, dislocation density evolution, nucleation Abstract. Process parameters in aluminium extrusion technology are key points that influence product properties. The precipitation hardening aluminium alloy 6082 is investigated according to different process conditions and the influence onto the final microstructure is simulated as well as experimentally verified. A physical microstructure model based on three dislocation types and three nucleation sites for recrystallization is implemented into the commercial Finite Element package FORGE 2008 to calculate both the microstructure evolution during the extrusion process as well as the recrystallized fraction after the process.
J. McQueen, W. J. McQueen: Deficiencies in Continuous DRX Hypothesis as a Substitute for DRX Theory, Materials Forum, Volume 28 (2004), pp. 351-356;  S. Gourdet, F. Montheillet: A model of continuous dynamic recrystallization, Acta Materialia, Volume 51 (2003), pp. 2685-2699;  W. Blum, Q. Zhu, R. J. 6Mn (AA5083), Materials Science and Engineering A, Volume 205 (1996), pp. 23-30;  M. Bakhshi-Jooybari: A theoretical and experimental study of friction in metal forming by the use of the forward extrusion process, Journal of Materials Processing Technology, Volume 125-126 (2002), pp.