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Friction Stir-Welded Dissimilar Aluminum Alloys: Microstructure, Mechanical Properties, and Physical State

Ghosh, M and Husain, Md M and Kumar, K and Kailas, SV (2013) Friction Stir-Welded Dissimilar Aluminum Alloys: Microstructure, Mechanical Properties, and Physical State. In: JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, 22 (12). pp. 3890-3901.

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Official URL: http://dx.doi.org/10.1007/s11665-013-0663-3

Abstract

A356 and 6061 aluminum alloys were joined by friction stir welding at constant tool rotational rate with different tool-traversing speeds. Thermomechanical data of welding showed that increment in tool speed reduced the pseudo heat index and temperature at weld nugget (WN). On the other hand, volume of material within extrusion zone, strain rate, and Zenner Hollomon parameter were reduced with decrease in tool speed. Optical microstructure of WN exhibited nearly uniform dispersion of Si-rich particles, fine grain size of 6061 Al alloy, and disappearance of second phase within 6061 Al alloy. With enhancement in welding speed, matrix grain size became finer, yet size of Si-rich particles did not reduce incessantly. Size of Si-rich particles was governed by interaction time between tool and substrate. Mechanical property of WN was evaluated. It has been found that the maximum joint efficiency of 116% with respect to that of 6061 alloy was obtained at an intermediate tool-traversing speed, where matrix grain size was significantly fine and those of Si-rich particles were substantially small.

Item Type: Journal Article
Additional Information: copyright for this article belongs to SPRINGER,USA
Keywords: aluminum alloys; friction stir welding; light microscopy; mechanical characterization
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 07 Jan 2014 05:42
Last Modified: 07 Jan 2014 05:46
URI: http://eprints.iisc.ac.in/id/eprint/48147

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