Mechanical and Microstructural Characterization of AA6061- AA7075 Dissimilar Friction Stir Welding
In this paper, mechanical and microstructural characterizations on dissimilar friction stir welding joints of aluminium alloy AA6061 and AA7075 were conducted. Mechanical property analysis of specimens was conducted using tensile test and Vickers hardness test. Meanwhile, microstructure characteri...
| Main Authors: | , , , |
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| Format: | Conference or Workshop Item |
| Language: | English English |
| Published: |
2015
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| Subjects: | |
| Online Access: | http://umpir.ump.edu.my/id/eprint/10901/ http://umpir.ump.edu.my/id/eprint/10901/1/Mechanical%20and%20Microstructural%20Characterization%20of%20AA6061-%20AA7075%20Dissimilar%20Friction%20Stir%20Welding.pdf http://umpir.ump.edu.my/id/eprint/10901/7/fkm-2015-LH-Mechanical%20and%20Microstructural.pdf |
| Summary: | In this paper, mechanical and microstructural characterizations on dissimilar friction stir welding joints
of aluminium alloy AA6061 and AA7075 were conducted. Mechanical property analysis of specimens was
conducted using tensile test and Vickers hardness test. Meanwhile, microstructure characterization of the
optimum sample was conducted using optical microscope, scanning electron microscopy (SEM) and energy
dispersive X-ray spectroscopy (EDS). Results show that samples exhibit good quality appearance with minor
surface defects. Fractured tensile specimens revealed that the failure occurs at the weaker aluminium side
(AA6061). The highest tensile strength of 219.6 MPa was achieved using 1000 rpm rotational speed,
110 mm/min travel speed and 3˚ tilt angle. The results from the micro-hardness analysis show that the highest
value of 151 HV was obtained from the thermo-mechanically affected zone (TMAZ) of AA7075 matrix.
Microstructure analysis on the other hand shows a single vortex lamellar structure in the weld zone, indicating
good material mixing. The fracture surface of the samples indicates ductile fracture behaviour initiating from the
AA6061 matrix.
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