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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
Published/Copyright: December 5, 2014
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 105 Issue 12

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.

Keywords: Al-Mg alloy; Scandium; Zirconium; Friction stir processing; Superplasticity
* 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

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https://doi.org/10.3139/146.111141
Keywords for this article
Al-Mg alloy; Scandium; Zirconium; Friction stir processing; Superplasticity

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. On the orientation dependence of grain boundary triple line energy in Cu
  5. Hydrogen storage kinetics of as-cast and spun (Mg24Ni10Cu2)100–xNdx (x = 0–20) alloys
  6. Segregation of phosphorus to ferrite grain boundaries during transformation in an Fe–P alloy
  7. A study on the pseudoelasticity of low temperature aged and thermomechanically treated Ti-51.5 at.% Ni shape memory alloy
  8. Experimental determination and thermodynamic calculation of the phase equilibria in the Co–Mn–Ta system
  9. 800°C isothermal section of the Co–Cr–Mo–Si quaternary system
  10. Phase fraction mapping in the as-cast microstructure of extrudable 6xxx aluminum alloys
  11. Effect of thixoforming on morphological changes in iron-bearing intermetallics and mechanical properties of Al–Si–Cu alloys
  12. The superplasticity of friction stir processed Al-5Mg alloy with additions of scandium and zirconium
  13. Short Communications
  14. Anti-corrosion behaviour of VE/GF coatings on mild steel
  15. Intermetallic phase stabilized Al/Pb metallic emulsion
  16. Synthesis of ultrafine powder (W,Ti)C by microwave heating in a stream of argon
  17. Fabrication and properties of porous silicon nitride ceramics via microwave sintering
  18. DGM News
  19. Personal
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