In this study, Fe3Al and AZ91 magnesium alloys were welded by friction welding method. The samples were machined to a cylindrical form having a diameter of 8 mm and 40 mm in length. Friction welding processes were carried out for 20, 40 and 60 MPa friction pressures under a friction time 12 s, 100 MPa forging pressure, 10 s forging time and 1000 rmp rotational speed. A continuous drive friction welding was used for friction welding process. After welding, the microstructures of welding interfaces of the welded samples were examined with optical microscopy and scanning electron microscopy (SEM). The optical microscopy and SEM investigations were revealed that the welding interfaces of the friction welded of AZ91 magnesium and Fe3Al alloys have a smooth morphology without any crack or pore. Diffusion zone was occurred in the interfaces of the welded samples. The mechanical properties of welding interfaces were determined using a specially designed shear test apparatus. The samples inserted in the apparatus were cut on the universal tension-compression testing machine. The hardness values were measured from the center of the welding interface to both sides. The micro hardness measurements of the welding interfaces showed that the hardness values differ slightly at welding interface.
Friction welding, AZ91 Magnesium alloy, Fe3Al, Hardness