Influence of Friction Stir Welding on Mechanical Properties of Butt Joints of AZ61 Magnesium Alloy

In this study, the effect of heat input on the mechanical properties and fracture behaviors of AZ61 magnesium alloy joints has been studied. Magnesium alloy AZ61 plates with thickness of 5 mm were welded at different ratios of tool rotational speed to welding speed (ω/ν). The average ultimate tensil...

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Bibliographic Details
Published in:Advances in materials science and engineering 2017-01, Vol.2017 (2017), p.1-13
Main Authors: Go, Yohan, Lim, Jae-Yong, Lee, Woo Geun, Kim, Jung-Seok, Sun, Seung-Ju, Kim, Young Min
Format: Article
Language:English
Subjects:
Alloys
Aluminum alloys
Butt joints
Butt welding
Defects
Electron backscatter diffraction
Engineering
Friction stir welding
Grain orientation
Influence
Magnesium
Magnesium base alloys
Materials science
Mechanical properties
Plates
Ratios
Solids
Studies
Ultimate tensile strength
Vehicles
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Summary:In this study, the effect of heat input on the mechanical properties and fracture behaviors of AZ61 magnesium alloy joints has been studied. Magnesium alloy AZ61 plates with thickness of 5 mm were welded at different ratios of tool rotational speed to welding speed (ω/ν). The average ultimate tensile strength of all weld conditions satisfying a ω/ν ratio of 3 reached 100% of the strength of the base material. Fractures occurred at the interface between the thermomechanical affected zone at advancing side and the stir zone in all welded specimens. From the scanning electron microscope and electron backscatter diffraction analysis, it was determined that the interface between the thermomechanical affected zone and the stir zone, which is the region where the grain orientation changes, was the weakest part; the advancing side region was relatively weaker than the retreating side region because the grain orientation change occurred more dramatically in the advancing side region.
ISSN:1687-8434
1687-8442
DOI:10.1155/2017/7381403