Effect of Homogenization Treatment on Superplastic Properties of Aluminum Based Alloy with Minor Zr and Sc Additions

Abstract:

Effect of one-step and two-step homogenization treatment on precipitation of Al₃(Sc,Zr) dispersoids, grain structure after annealing of cold rolled sheets and superplastic behaviour of a novel Al-Mg based alloy were studied. Heterogeneous nucleation of Al₃(Sc,Zr) phase on dislocations and subboundaries dominated at one-step annealing and both homogeneous and heterogeneous nucleation of Al₃(Sc,Zr) were observed at two-step annealing modes. It was shown that two-step treatment mode provides high density of Al₃(Sc,Zr) precipitates and 650 % of elongation at the constant strain rate of 10^-2 s^-1 in the studied alloy.

• Periodical: Defect and Diffusion Forum (Volume 385)
• Pages: 84-90
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.385.84
• Online since: July 2018
• Authors: Anna Kishchik, Anastasia V. Mikhaylovskaya*, Anton D. Kotov, Vladimir K. Portnoy
• Keywords: Aluminium Alloy, Dispersoids, Homogenization, L1₂ Phase, Superplasticity

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