Optimization of the Chemical Composition and Homogenization Treatment of AA7020 Aluminum Alloy


Article Preview

Four variants of AA7020 aluminum alloy having different Zr and Cr contents were investigated aiming at reaching high recrystallization resistance during and after hot deformation. Isothermal homogenization treatments were performed at temperatures of 390-550 °C for 2 to 48 hours. The uni-axial hot compression tests were conducted at 450 °C and strain rate of 10 s-1 at a strain of 0.6. Thereafter, the samples were annealed at 550 °C for 10 min. It was found that the samples with the highest Zr and Cr contents showed the lowest volume fraction of recrystallized grains which was attributed to the highest volume fraction of Zr- and Cr-containing dispersoids formed during homogenization. The optimum homogenization treatment to achieve highest recrystallization resistance for these samples was 470 °C for 24 hours.



Advanced Materials Research (Volumes 89-91)

Edited by:

T. Chandra, N. Wanderka, W. Reimers , M. Ionescu




A. R. Eivani et al., "Optimization of the Chemical Composition and Homogenization Treatment of AA7020 Aluminum Alloy", Advanced Materials Research, Vols. 89-91, pp. 177-183, 2010

Online since:

January 2010




[1] T. Sheppard: Extrusion of Aluminum Alloys, Kluwer Academic Publishers, Dordrecht, the Netherlands, 1999, 227-252. 2.

[2] J.D. Robson and P.B. Prangnell: Acta Mater., Vol. 49 (2001) pp.599-613.

[3] J.D. Robson: Mater. Mater. Sci. Eng. A. Vol. 338 (2002) pp.219-229.

[4] B. Morere, R. Shahani, C. Maurice and J. Driver: Metal. Mater. Trans. A. Vol. 32(3) (2001) pp.625-632.

[5] O. Daaland and E. Nes: Acta Mater. Vol. 44(4) (1996) pp.1389-1411.

[6] Y.J. Li and L. Arnberg: Acta Mater. Vol. 51(12) (2003) pp.3415-3428.

[7] L. Lodgaard and N. Ryum: Mater. Sci. Eng. A. Vol. 283 (2000) pp.144-152.

[8] L. Lodgaard and N. Ryum: Mater. Sci. Tech. Vol. 16 (6) (2000) pp.599-604.

[9] ASTM E 112-96, Standard Test Methods for Determining Average Grain Size, (American Society for Testing and Materials) pp.1-26.

[10] ASTM E562-02, Standard Test Methods for Determining Volume Fraction by Systematic Manual Point Count, (American Society for Testing and Materials).

[11] A.R. Eivani, H. Ahmed, J. Zhou and J. Duszczyk: Submitted to Scripta Mater.

[12] F.J. Humphreys, M. Hatherly, Recrystallization and Related Annealing Phenomena (Oxford, U. K, Elsevier Science Inc., 1995).

Fetching data from Crossref.
This may take some time to load.