Effect of Minor Amounts of Scandium on Recrystallization Behavior of 7000 series Aluminium

Beigei Kheradmand, A.; Mirdamadi, S.; Nategh, S.

doi:10.22068/ijmse.17.3.70

Volume 17, Issue 3 (September 2020) IJMSE 2020, 17(3): 70-79 | Back to browse issues page

‎ 10.22068/ijmse.17.3.70

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Beigei Kheradmand A, Mirdamadi S, Nategh S. Effect of Minor Amounts of Scandium on Recrystallization Behavior of 7000 series Aluminium. IJMSE 2020; 17 (3) :70-79
URL: http://ijmse.iust.ac.ir/article-1-1234-en.html

Effect of Minor Amounts of Scandium on Recrystallization Behavior of 7000 series Aluminium

A. Beigei Kheradmand

, S. Mirdamadi

, S. Nategh

Abstract: (14117 Views)

In the present study, the effect of adding minor amounts of scandium and zirconium elements to the 7075 alloyon the re-crystallization behaviour of one aluminium alloy (7000 series) was investigated. For this purpose, two kinds of Al-Zn-Mg-Cu-Sc-Zr alloys with the same amount of Zr and different amount of Sc were prepared. Homogenization durations and temperatures of alloys after alloying were obtained by DSC analysis and optical microstructure observations. The results showed that the optimum homogenization temperatures for Al-Zn-Mg-Cu-0.05Sc-0.1Zr and Al-Zn-Mg-Cu-0.1Sc-0.1Zr alloys were 500⁰C and 490⁰C respectively, and the optimum duration for both alloys was 12hours. After homogenization of alloys, the re-crystallization behaviour of the alloys was investigated by Brinell hardness test. Obtained results showed that although the starting re-crystallization temperature for both alloys was similar in 2 hours, but it was 130°C for alloys with 30% forming, and 120°C for alloys with 50%forming and recrystallization temperature for Al-Zn-Mg-Cu-0.1Sc-0.1Zr alloy was 350

in 2 hours. Despite what was expected, the hardness of Al-Zn-Mg-Cu-0.05Sc-0.1