Abstract
In this research, sound dissimilar joints between commercially pure titanium and aluminum alloy 5083 were produced in the butt joint configuration by friction stir welding using a rotation speed of 1120 rpm and a welding speed of 50 mm min^–1. To investigate the properties of the created joint, microstructure and hardness of the weld zone were evaluated. The results show that three zones exist in the stir zone, namely aluminum base metal, titanium base metal, and the area composed of intermetallic compounds of aluminum and titanium. It is also observed that the joint region in the aluminum side consists of stir zone, thermo-mechanically affected zone and heat affected zone, while the joint region on the titanium side includes stir zone and heat affected zone. The highest hardness was measured in the stir zone, 480 VHN, which is due to excessive plastic deformation and intermetallic compounds formation.

Key words
commercially pure titanium, aluminum H-321 5083, friction stir welding, microstructure, mechanical properties

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