Modelling the Precipitation of Al3X Dispersoids in Aluminium Alloys and their Effect on Recrystallization


Article Preview

A combined model is presented that predicts the non-uniform distribution of Al3X dispersoid particles in commercial aluminium alloys containing zirconium and scandium and uses these predictions as inputs to a simple recrystallization model. The recrystallization model relies on knowledge of the stored energy in the sub-structure after deformation and this has been measured using electron backscattered diffraction (EBSD) techniques. The recrystallization model is based on the concept that partial recrystallization results from the non-uniform distribution of dispersoid particles due to their precipitation from a segregated cast structure. The model has been used to devise an improved homogenization treatment for AA7050, which uses an isothermal hold during heat up to maximize dispersoid nucleation. It has also been applied to predict the effect of scandium additions on recrystallization, investigate the factors that control the through thickness variation in recrystallized fraction, and interpret the results of experiments where the effect of strain rate have been studied.



Edited by:

P. B. Prangnell and P. S. Bate




J. D. Robson et al., "Modelling the Precipitation of Al3X Dispersoids in Aluminium Alloys and their Effect on Recrystallization", Materials Science Forum, Vol. 550, pp. 45-54, 2007

Online since:

July 2007




[1] J. T. Staley, Properties Related to Fracture Toughness, ASTM STP 605, American Society for Testing and Materials, (1976).

[2] O. Engler, E. Sachot, J. C. Ehstrom, A. Reeves, R. Shahani, Mater. Sci. Tech. Vol. 12 (1996), p.717.

[3] J. D. Robson, P. B. Prangnell, Acta Mater. Vol. 49 (2001), p.599.

[4] J. D. Robson, Mater. Sci. Eng. A Vol. A338 (2002), p.219.

[5] F. A. Costello, J. D. Robson, P. B. Prangnell, Mater. Sci. Forum Vol. 396-492 (2002), p.757.

[6] H. Hallem. W. Lefebvre, B. Forbord, F. Danoix, K. Marthinsen, Mater. Sci. Eng. A Vol. A421 (2006), p.154.

[7] J. D. Robson, Acta Mater. Vol. 52 (2004), p.1409.

[8] R. Kampmann, R. Wagner, Materials Science and Technology Vol. 5, (VCH Weinheim, Germany 1991).

[9] F. J. Humphreys, M. Hatherly, Recrystallization and Related Annealing Phenomena (Pergamon Press, UK 1996).

[10] F. J. Humphreys, Orientation Mapping and Quantitative Metallography by EBSD (Manchester Materials Science Centre, 2000).

[11] B. Forbord, W. Lefebvre, F. Danoix, H. Hallem, K. Marthinsen, Scripta Mater Vol. 51 (2004), p.333.


[12] J.D. Robson, B.J. McKay, C. P. Heason:, Proc. ICAA-9 (Institute of Materials Engineering Australasia 2004), p.913.