Effect of Rolling on Superplastic Behavior of an Al-Mg-Sc Alloy with Ultrafine-Grained Structure

Abstract:

The superplastic behavior of a commercial aluminum alloy denoted as 1570 Al with a chemical composition of Al-6%Mg-0.5%Mn-0.2%Sc-0.07%Zr (in wt. %) and ultrafine-grained (UFG) structure produced by equal channel angular pressing at 300°C to a true strain ~12 was studied after final cold or warm rolling. The tensile specimens were machined along rolling direction and pulled up to failure in the temperature range of 250 to 500°C at strain rates ranging from 10^-4 s^-1 to 10^-1 s^-1. The specimens produced by warm or cold rolling exhibit different superplastic behavior. The material subjected to warm rolling exhibits excellent superplastic properties; the highest elongation-to-failure of ~1970% was recorded at a temperature of ~450°C and an initial strain rate of 1.4×10^-1 s^-1. On the other hand, the material subjected to cold rolling demonstrates moderate superplastic properties; the highest elongation-to-failure of ~755% appears at a temperature of ~300°C and an initial strain rate of 1.4×10^-2 s^-1.

• Periodical: Materials Science Forum (Volumes 838-839)
• Pages: 416-421
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.838-839.416
• Online since: January 2016
• Authors: Andrii Dubyna*, Sergey Malopheyev, Rustam Kaibyshev
• Keywords: Rolling , Aluminium Alloy, Equal-Channel Angular Pressing, Superplasticity, Ultrafine-Grained Structure

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