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Strain accumulation is easily formed in friction stir welded Mg alloys which significantly deteriorate the strength of the joints. However, the formation mechanisms of strain accumulation are not well understood. The present study aims to explore the different strain accumulations on the top and bottom side of welded samples using tensile and compressive tests. An effective procedure is provided for measuring strain accumulation. An interesting finding is that the measured strain accumulations differ from those determined by visual inspection. The analyses indicate that the different types of strain accumulation at both sides have a close relationship with the shear layers and textural variations in the stir zone. Additionally, a model for the formation of strain accumulation at the top and bottom side of the Mg weld joints is provided.

Strain accumulation at the top and bottom side of a friction stir welded alloy AZ31 under tensile and compressive loading