铝/镁异种合金间搅拌摩擦焊接头力学性能影响因素

he morphology of Al/Mg interface is controlled by the tool offset, which can result in the differentiation of Al/Mg intermixing during friction stir welding (FSW). During this process, the mechanical behavior can be greatly affected by the following two factors: tool offset and welding configuration. It shows that interface is the place by which the joint efficiency is greatly affected. The sufficient deformation of interface is required for the formation of strong solid bonding. On the other hand, overreaction caused by over-intermix will contribute to the formation of bulk intermetallics, which will lower the joint efficiency greatly. Therefore, sufficient deformation of the interface is required while the intermixing of Al/Mg should be well controlled to achieve high strength bonding.