Effect of Interlayer Towards the Joint Properties Enhancement of Dissimilar Friction Welded SS321-AA2219

Rotary friction weldingRotary friction welding is a promising technique for joining cylindrical components of dissimilar materialsMaterials. This study experimentally investigates the performance of rotary frictionFriction welded SS321SS321-AA2219AA2219 joints, with and without AA6063 interlayer. The evolution of force and temperatureTemperature during the processProcess is studied and its effect on microstructureMicrostructure and mechanical propertiesMechanical properties is observed. Placing an interlayer between SS321SS321 and AA2219AA2219 affects the force and temperatureTemperature evolution during the processProcess. By using AA6063 as an interlayer, both force and temperatureTemperature during the processProcess increased. Electron back scattered diffractionElectron Back Scattered Diffraction (EBSD) results showed the fine grains towards the AA2219AA2219 side. The strain free AA2219AA2219 grains near the interface suggest dynamic recrystallizationDynamic recrystallization from plastic deformation. On the SS321SS321 side of the joint interface, the presence of strained and deformed grains is indicated by the high LAGB fraction (77.2% for without interlayer and ~ 80% for with interlayer). The phase identification from EBSDElectron Back Scattered Diffraction (EBSD) phase map revealed the presence of Al2Fe and Al13Fe4 intermetallics in the joints made without interlayer. Besides Al2Fe and Al13Fe4, AlFe, Fe7Al11, and Al5Fe2 were also noticed the joint made without interlayer. The strength of joint made with interlayer was 227.4 ± 7.4 MPa, which was ~ 40% higher than the joints made with interlayer. Joint efficiency was 56.7% with respect to AA2219AA2219 base materialMaterials.