Abstract

Ti-6Al-4V alloy and high-workability titanium alloy (SP700) plates were welded under various FSW conditions in order to investigate the microstructure and mechanical properties of the joint. When the welding was performed below the β-transus temperature, the stir zone consisted of the fully equiaxed primary α+β phase. On the other hand, when the welding was conducted above the β-transus temperature, a lamellar structure was observed in the stir zone. Additionally, the size of the lamellar structure was successfully controlled by the FSW conditions. The mechanical properties of the joint were significantly affected by its phase and microstructure.

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