Combined Physical Modeling and Monte Carlo Simulation of Recrystallization of Hot Deformed AA7020 Aluminum Alloy

Abstract:

In this research, recrystallization of AA7020 aluminum alloy after hot compression testing was predicted using a framework being a combination of physical modeling and Monte Carlo simulation. Stored energy was calculated as a function of subgrain size related to the Zener Hollomon parameter. The as-deformed grain structure was mapped into the Monte Carlo simulation from experimental results. Calculated stored energy was assigned to the mapped structure, considering the length scale of the simulation. Results were validated by comparing the microstructures obtained from the model predictions with those from experimental results and a reasonable agreement was reached. The predicted grain size was found to be 15 % smaller than the experimental values. Predicted fractions recrystallized showed a similar trend to the experimental results. However, a discrepancy between the model predictions and experimental results in terms of recrystallization kinetics was found, which was attributed to neglecting the effect of subgrain growth and resulting reduction of the stored energy during recovery on the recrystallization kinetics in the present simulation.

• Periodical: Materials Science Forum (Volumes 715-716)
• Pages: 480-485
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.715-716.480
• Online since: April 2012
• Authors: Ali Reza Eivani, Jie Zhou, Jurek Duczczyk
• Keywords: Hot Deformation, Monte-Carlo Simulation, Recrystallization

References

[1] D.J. Srolovitz, G.S. Grest and M.P. Anderson: Acta Metall. Vol. 34 (1986), p.1833.

[2] D.J. Srolovitz, G.S. Grest, M.P. Anderson and A.D. Rollett: Acta Metall. Vol. 36 (1988), p.2115.

[3] M. Rettenmayr and X. Song: Mater. Sci. Technol. Vol. 19 (2003), p.173.

[4] X. Song, M. Rettenmayr, C. Muller and H.E. Exner: Metall. Mater. Trans. A Vol. 32 (2001), p.2199.

[5] X. Song and M. Rettenmayr: Mater. Sci. Eng. A Vol. 332 (2002), p.153.

[6] E. Cerri, E. Evangelista, A. Forcellese and H.J. McQueen: Mater. Sci. Eng. A Vol. 197 (1995), p.181.

[7] H.E. Vatne, T. Furu, R. Orsund and E. Nes: Acta Mater. Vol. 44 (1996) p.4463.

[8] C.M. Sellars and Q. Zhu: Mater. Sci. Eng. A Vol. 280 (2000), p.1.

[9] A.R. Eivani, PhD Thesis, Summer 2010, Delft, The Netherlands.

[10] Y. Saito and M. Enomoto: ISIJ Int. Vol. 32 (1992), p.267.

[11] Y. Saito: Mater Sci. Eng. A Vol. 223 (1997), p.114.

[12] Y. Saito: ISIJ Int. Vol. 38 (1998), p.559.

[13] A.R. Eivani, J. Zhou, J. Duszczyk: Accepted for publication in Mater. Sci. Eng. A, (2010).

[14] F.J. Humphreys and M. Hatherly: Recrystallization and Related Annealing Phenomena (Elsevier Science Inc, UK 1995).