Friction stir processing of direct metal deposited copper–nickel 70/30

Friction stir processing (FSP) was carried out on a multi-layered copper–nickel 70/30, deposited on a copper–nickel 70/30 substrate via laser-assisted direct metal deposition (DMD). Microstructural changes associated with single and overlapping FSP passes were analyzed using electron microscopy. Mechanical property and corrosion behavior were also evaluated before and after FSP. It was observed that FSP reduces porosity, refines grains, increases hardness, reduces ductility and increases corrosion rate in comparison to DMD copper–nickel 70/30.