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Intermetallic Compound Formation in Al/Mg Friction Stir Welded (FSW) Butt Joints

[+] Author Affiliations
Z. G. El Chlouk, R. F. Hamade

American University of Beirut, Beirut, Lebanon

G. Ayoub

Texas A&M University at Qatar, Doha, Qatar

G. T. Kridli

University of Michigan, Dearborn, MI

Paper No. IMECE2014-37213, pp. V014T11A010; 6 pages
doi:10.1115/IMECE2014-37213
From:
  • ASME 2014 International Mechanical Engineering Congress and Exposition
  • Volume 14: Emerging Technologies; Engineering Management, Safety, Ethics, Society, and Education; Materials: Genetics to Structures
  • Montreal, Quebec, Canada, November 14–20, 2014
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4963-7
  • Copyright © 2014 by ASME

abstract

In this work, friction stir welding (FSW) is used to produce butt joints of 3-mm-thick sheets of AZ31B magnesium alloy to two different aluminum alloys: AA1100 (minimum 99% aluminum) and AA6061 (97.9% Al). The paper reports on utilizing metallurgical techniques to determine the distribution profiles of elemental aluminum and magnesium within the joints were produced using energy dispersive x-ray spectroscopy (EDX). Furthermore, X-ray diffraction (XRD) was used to identify the intermetallic compounds that form in the joints as a result of the stirring action at processing temperatures. Measurements confirmed the presence of primary intermetallic compounds in the welded joints and were identified to be the α-phase (Al12Mg17) and the β-phase (Al3Mg2). Lastly, micro-hardness studies were conducted at the intermetallic-compounds-rich locations resulting in hardness profiles.

Copyright © 2014 by ASME

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