Abstract
The Ni50-Ti50 type of shape memory alloy is welded using friction welding process under several upset force conditions. When friction welded joints were heat treated, joints showed the good mechanical properties and shape memory characteristics, because friction welding process gave severe hot deformation in welded zone during joining process. This heavy deformation made fine micro-structures and this was preferable effect on shape memory characteristics.
It clearly shows that the all welded joints has almost same transformation temperatures to base metal after heat treated condition. The stress strain curves shows the better shape memory tendencies than base metal.
