This paper investigates the influence of the rotational speed of the tool used in the friction stir welding of an AZ61A magnesium alloy. Five different rotational speeds were used to fabricate joints between plates of the alloy. The tensile properties of the joints were evaluated and correlated with the microstructure observed in the stir zone. The formation of very fine grains in the stir zone is observed to create superior tensile properties for these joints.
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