Integrated Modeling of Strength Evolution in Al-Mg-Si Alloys during Hot Deformation

Abstract:

In the present work we develop a physically based model of strength evolution during hot deformation of Al-Mg-Si alloys. The goal is to predict a change of material strength taking into account the impact of microchemistry, i.e. the influence of solutes and precipitates on strengthening and softening mechanisms. The material strengthening is considered in the present work in terms of solid solution strengthening (the Labusch-Naborro model), work hardening (the advanced one-parameter Kocks model), as well as precipitation strengthening due to the stress contribution of non-deformable particles, i.e. dispersoids (the Orowan by-pass). The material softening is described by dynamic recovery through thermal activation of dislocation climb. For the precipitation kinetics the computational thermodynamics code MatCalc (Materials Calculator) was used. The model was validated by comparison with experimental data of compression tests of the 6xxx series aluminium alloys and a reasonable agreement of the simulated and measured flow stress curves was found.

• Periodical: Materials Science Forum (Volume 765)
• Pages: 429-433
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.765.429
• Online since: July 2013
• Authors: Evgeniya Kabliman, Pavel Sherstnev
• Keywords: Al-Mg-Si Alloy, Dynamic Recovery, Hot Deformation, Strength, Thermo-Kinetic Simulations

References

[1] O.R. Myhr, Ø. Grog, S.J. Andersen, Modelling of the age hardening behaviour of Al-Mg-Si alloys, Acta Mater. 49 (2001) 65-75.

DOI: 10.1016/s1359-6454(00)00301-3

[2] U.F. Kocks, Laws for work-hardening and low-temperature creep, ASME J. Eng. Mat. Techn. 98 (1976) 76-85.

DOI: 10.1115/1.3443340

[3] P. Sherstnev, P. Lang, E. Kozeschnik, in: Proc. European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2012), Vienna, Austria (2012)

[4] E. Jannot, V. Mohles, G. Gottstein, B. Thijsse, Atomistic Simulation of Pipe Diffusion in AlCu alloys, Defect and Diffusion Forum 249 (2006) 47-54.

DOI: 10.4028/www.scientific.net/ddf.249.47

[5] J. Hirsch, Virtual Fabrication of Aluminium Products. Microstructural Modelling in Industrial Aluminium Production, edited by Jürgen Hirsch, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2006.

[6] R. Labusch, Statistische theorien der mischkristallhärtung, Acta Metall. 20 (1972) 917-927.

DOI: 10.1016/0001-6160(72)90085-5

[7] F.R.N. Nabarro, The theory of solution hardening, Philos. Mag. 35 (1977) 613-622.

[8] M.F. Ashby, Results and consequences of a recalculation of the frank-read and the orowan stress, Acta. Metall. 14 (1966) 679-681.

DOI: 10.1016/0001-6160(66)90074-5

[9] J. Zander, R. Sandström, L. Vitos, Modelling mechanical properties for non-hardenable aluminium alloys, Comp. Mater. Sci. 41 (2007) 86-95.

DOI: 10.1016/j.commatsci.2007.03.013

[10] Information on http://matcalc.tuwien.ac.at.

[11] E. Nes, K. Marthinsen, B. Rønning, Modelling the evolution in microstructure and properties during processing of aluminium alloys, J. Mat. Proc. Techn. 117 (2001) 333-340.

DOI: 10.1016/s0924-0136(01)00791-9