Table of Contents
Journal of Metallurgy
Volume 2012, Article ID 303756, 7 pages
http://dx.doi.org/10.1155/2012/303756
Research Article

Friction Stir Welding of Al 5052 with Al 6061 Alloys

1Materials Science Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
2Scientific Information Resource Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India

Received 29 November 2011; Accepted 19 February 2012

Academic Editor: Stan A. David

Copyright © 2012 N. T. Kumbhar and K. Bhanumurthy. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Friction stir welding (FSW), a solid-state joining technique, is being extensively used in similar as well as dissimilar joining of Al, Mg, Cu, Ti, and their alloys. In the present study, friction stir welding of two aluminium alloys—AA6061 and AA5052—was carried out at various combinations of tool rotation speeds and tool traverse speeds. The transverse cross-section of the weld was used for optical as well as electron microscopy observations. The microstructural studies were used to get an indication of the extent of material mixing both at the macro- and microscales. It was observed that, at the interface region, both materials exhibited similar texture despite the nonrigorous mixing of the materials in the nugget. The extent of interdiffusion of alloying elements at the interface was studied using electron probe microanalysis. The tensile testing evaluation of these specimens showed good mechanical properties. The interdiffusion of alloying elements and development of similar orientations in the nugget could have contributed to the better tensile properties of the friction-stir-welded AA5052-AA6061 specimens.