### Superplastic Behavior of Al-4.5Mg-0.46Mn-0.44Sc Alloy Sheet Produced by a Conventional Rolling ProcessSuperplastic Behavior of Al-4.5Mg-0.46Mn-0.44Sc Alloy Sheet Produced by a Conventional Rolling Process

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 Author Smolej, A. ♦ Skaza, B. ♦ Dragojević, V. Source SpringerLink Content type Text Publisher Springer US File Format PDF Copyright Year ©2009 Language English
 Subject Domain (in DDC) Technology ♦ Engineering & allied operations Subject Keyword Al-4.5Mg-0.46Mn-0.44Sc alloy ♦ cavitation ♦ dynamic grain growth ♦ elongation to failure ♦ hardening characteristics ♦ strain-rate sensitivity index ♦ superplastic properties ♦ thermomechanical treatment ♦ Engineering Design ♦ Quality Control, Reliability, Safety and Risk ♦ Tribology, Corrosion and Coatings ♦ Materials Science ♦ Characterization and Evaluation of Materials Abstract This article describes the superplastic behavior of the Al-4.5Mg-0.46Mn-0.44Sc alloy. The investigated alloy was produced by casting and was conventionally processed to form a sheet with a thickness of 1.9 mm and an average grain size of 11 μm. The superplastic properties of the alloy were investigated using a uniaxial tensile testing with a constant cross-head speed and with a constant strain rate in the range 1 × 10$^{−4}$ to 5 × 10$^{−2}$ s$^{−1}$ at temperatures from 390 to 550 °C. The investigations included determinations of the true-stress, true-strain characteristics, the maximum elongations to failure, the strain-rate sensitivity index m, and the microstructure of the alloy. The m-values determined with the strain-rate jump test varied from 0.35 to 0.70 in the temperature interval from 390 to 550°C and strain rates up to 2 × 10$^{−2}$ s$^{−1}$. The m-values decreased with increased strain during pulling. The elongations to failure were in accordance with the m-values. They increased with the temperature and were over 1000%, up to 1 × 10$^{−3}$ s$^{−1}$ at 480 °C and up to 1 × 10$^{−2}$ s$^{−1}$ at 550 °C. A maximum elongation of 1969% was achieved at an initial strain rate of 5 × 10$^{−3}$ s$^{−1}$ and 550 °C. The results show that the addition of about 0.4 wt.% of Sc to the standard Al-Mg-Mn alloy, fabricated by a conventional manufacturing route, including hot and cold rolling with subsequent recrystallization annealing, results in good superplastic ductility. ISSN 10599495 Age Range 18 to 22 years ♦ above 22 year Educational Use Research Education Level UG and PG Learning Resource Type Article Publisher Date 2009-05-09 Publisher Place Boston e-ISSN 15441024 Journal Journal of Materials Engineering and Performance Volume Number 19 Issue Number 2 Page Count 10 Starting Page 221 Ending Page 230