Accessible Requires Authentication Published by De Gruyter December 5, 2014

The superplasticity of friction stir processed Al-5Mg alloy with additions of scandium and zirconium

Anton Smolej, Damjan Klobčar, Brane Skaza, Aleš Nagode, Edvard Slaček, Vukašin Dragojević and Samo Smolej

Abstract

The paper describes the effect of minor additions of scandium and zirconium on the superplastic behaviour of friction stir processed Al-5Mg based alloy. The measurements included the flow curves and tensile elongations of (in wt.%) Al-5Mg-0.1Zr, Al-5Mg-0.2Sc, and Al-5Mg-0.2Sc-0.15Zr alloys at initial strain rates ranging from 1 × 10−3 to 1 × 10−1 s−1, and at forming temperatures from 350 to 500°C. The inclusion of friction stir processing at tool rotation rates of 95 and 475 rpm considerably enhanced the superplastic behaviour of the Al-5Mg-0.2Sc-0.15Zr alloy, which was reflected in elongations without failure of over 1900%. Other friction stir processed alloys, treated at lower tool rotation rates, did not achieve superplasticity due to abnormal grain growth. The results yielded by the friction stir processed alloys are compared with the superplastic behaviour of the same alloys produced conventionally by cold rolling.


* Correspondence address, Prof. Dr. Anton Smolej, Faculty of Natural Science and Engineering, University of Ljubljana, Aškerčeva ul. 12, 1000 Ljubljana, Slovenia, Tel.: +38615072 059, Fax: +38614704 560, E-mail:

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Received: 2014-05-31
Accepted: 2014-07-25
Published Online: 2014-12-05
Published in Print: 2014-12-08

© 2014, Carl Hanser Verlag, München