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

Ali Reza Eivani; H. Ahmed; Jie Zhou; Jurek Duczczyk

doi:10.4028/www.scientific.net/AMR.89-91.177

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 89-91Optimization of the Chemical Composition and...

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

Abstract:

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.

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Periodical:

Advanced Materials Research (Volumes 89-91)

Pages:

177-183

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.89-91.177

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Online since:

January 2010

Authors:

Ali Reza Eivani, H. Ahmed, Jie Zhou, Jurek Duczczyk

Keywords:

AA7020 Aluminum Alloy, Cr, Homogenization, Recrystallization, Zr

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References

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

Google Scholar

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

Google Scholar

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

Google Scholar

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

Google Scholar

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

Google Scholar

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

Google Scholar

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

Google Scholar

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

Google Scholar

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

Google Scholar

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

Google Scholar

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

Google Scholar

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

Google Scholar