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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.48  No.9 (2007)  >  pp.2501-2505

MATERIALS TRANSACTIONS
<<Previous article Vol.48  No.9 (2007)   pp.2501 - 2505 Next article>>

Dissimilar Friction Stir Welded Joints between 2024-T3 Aluminum Alloy and AZ31 Magnesium Alloy

Saad Ahmed Khodir1) and Toshiya Shibayanagi1)
1) Joining and Welding Research Institute, Osaka University

Dissimilar alloys such as 2024-T3 Al alloy and AZ31 Mg alloy of plates in 3 mm thickness has been friction stir butt welded. The welding was carried out at a constant rotation speed of 2500 min−1 and welding speeds of 200, 300, 400 and 550 mm/min. Effects of welding speeds on microstructures and hardness distributions of the joints were investigated. Distribution of phases in the stir zone (SZ) was analyzed by a scanning electron microscope (SEM) equipped with an energy dispersive X-ray spectroscopy (EDS).
Increasing welding speed brought about a redistribution of phases in SZ where the regions occupied by 2024 Al alloy concentrated in the lower portion of SZ while AZ31 Mg alloy concentrated in the upper region beneath the tool shoulder. The laminated structure was formed in the SZ near the boundary between SZ and TMAZ on the advancing side of 2024 Al alloy regardless of the welding speed. The hardness value fluctuates in the SZ due to formation of intermetallic compounds that formed by constitutional liquation during welding.


Keyword:
2024-T3 aluminum alloy, AZ31 magnesium alloy, friction stir butt welding, welding speed, scanning electron microscope (SEM)-energy dispersive X-ray Spectroscopy (EDS) method, hardness distributions

Received: May 01, 2007
Accepted: July 05, 2007 , Published online: August 25, 2007
Copyright (c) 2007 The Japan Institute of Metals

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