Characterization of ultrafine-grained copper joints acquired by rotary friction welding

Abstract Copper rods with ultrafine-grained microstructure, obtained by multi-turn ECAP processing, were subjected to Direct Drive Rotary Friction Welding using various processing parameters, such as rotational speed and pressure, which resulted in different energy heat input. Even though friction welding is a high process, proper selection of parameters it was possible maintain grain size at around 0.7 µm the weld zone preserve UFG microstructure. These microstructural features translated into mechanical properties: YS for those specimens 330 MPa. Processing that larger input caused an increase 2 µm; this, however, increased ductility led uniform elongation exceeding 5%. Corrosion resistance stir increased, evident higher open circuit potential corrosion comparison base material; observed differences about 50 mV. changes can be explained fraction HAGBs SZ.