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By A Erman Tekkaya; Nooman Ben Khalifa

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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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Extra 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

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E. Vatne, T. Furu, R. Orsund, E. Nes, “Modelling recrystallization after hot deformation of aluminium”, Acta Materialia, vol. 44 (1996) pp. 4463-4473. M. Sellars, Q. Zhu, “Microstructural modelling of aluminium thermomechanical processing”, Mater. Sci. , vol. A280 (2000) pp. 1-7. alloys during [11] E. Kozeschnik, J. Svoboda, P. D. Fischer, “Modelling of kinetics in multi-component multi-phase systems with spherical precipitates: II: Numerical solution and application”, Materials Science and Engineering, vol.

Hence it is important to consider the influence of the process conditions on the evolution of structure, such as the homogenization treatment both to dissolve particles that are detrimental to the materials formability and to spheroidize plate like particles, respectively. [2,3]. Moreover, the initial microstructure of the billet and extrusion parameters like the extrusion speed, the initial temperature of the billet, container and die, the extrusion ratio, quality of tool surfaces and the die configuration control the materials hardening and softening as well as the substructure evolution during extrusion, which has a great effect on the final grain structure [4,5].

In Fig. 4 and Fig. 5 the evolution of the equivalent plastic strain, temperature and nondimensional subgrain size in die exit, DMZ and MDZ for two different contact conditions are shown. Comparing these two cases shows the different behavior of the microstructure evolution due to friction effect. Fig. 4 (a) demonstrates that the equivalent plastic strain is mainly developed in die exit area and in MDZ whereas in the dead material zone it remains almost zero. The evolution of equivalent plastic strain results in the evolution of temperature and state dependent variables such as subgrain size.

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