High Resolution EBSD Analysis of the Grain Structure in an AA2024 Friction Stir Weld

摘要: The grain structures formed during friction stir welding of a typical aluminium aerospace alloy have been studied by high resolution EBSD analysis. reflect the local deformation conditions, and due to temperatures strains, show characteristics different stages dynamic recrystallisation. large strains density second phase particles in nugget zone result very fine 2-3 μm equiaxed size. There is an abrupt transition structure between TMAZ at side weld. A was also observed near top surface weld that contact with tool shoulder. zone, onion ring attributed bands densities particles, rather than any significant difference or texture.