Rev.Adv.Mater.Sci. (RAMS)
No 3, Vol. 25, 2010, pages 249-255

THE EFFECT OF ALLOYING ELEMENTS ON SUPERPLASTICITY
IN AN ULTRAFINE-GRAINED ALUMINUM ALLOY

R.K. Islamgaliev, N.F. Yunusova, M.A. Nikitina and K.M. Nesterov

Abstract

The effect of the Mg and Zr alloying elements additions on microstructure and superplasticity of the ultrafine-grained Al-Mg-Si aluminium alloy processed by high pressure torsion (HPT) has been studied in the paper. Microstructure of the HPT samples was investigated by transmission electron microscopy and electron back scattering diffraction. Special attention was paid to thermal stability of the grain structure after tensile tests at elevated temperatures. It was shown that stabilization of the ultrafine-grained structure by alloying elements provides the increase of elongation to failure from 120% to 600% at strain rate 10-2 and temperature 300 °C.

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