2219-T6 and 2195-T8 were selected for friction stir heterogeneous welding.Using nanoindentation to establish the relationship between microstructure and nanomechanical properties of joints.During the friction stir welding process,the grains in the stir zone were refined through dynamic recrystallization,and the main mechanisms of dynamic recrystallization were continuous dynamic recrystallization and geometric dynamic recrystallization.Due to the inherent properties of the material,the overall microhardness of 2195 was higher than that of 2219,and the decrease of microhardness in each zone value was due to the coarsening and dissolution of the precipitations.The creep mechanism was mainly dislocation slip.Grain boundaries,dislocations,and coarse precipitations jointly affected the creep resistance of materials,and coarse precipitations played a major role.
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