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

Ghosh, M and Husain, M M and Kumar, K and Kailas, S V (2013) Friction Stir-Welded Dissimilar Aluminum Alloys: Microstructure, Mechanical Properties, and Physical State. Journal of Materials Engineering and Performance , 22(12) (IF-0.915). pp. 3890-3901.

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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:Article
Official URL/DOI:http://apps.webofknowledge.com/full_record.do?prod...
Uncontrolled Keywords:aluminum alloys; friction stir welding; light microscopy; mechanical characterization
Divisions:Material Science and Technology
ID Code:6801
Deposited By:Sahu A K
Deposited On:03 Jan 2014 12:53
Last Modified:27 Feb 2014 13:14
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