مشخصات پژوهش

Friction stir welding/processing (FSW/FSP) of metals and their alloys has been investigated widely in recent years. The microstructure of alloys affects the mechanical and physical properties of processed materials and joints, therefore studying microstructure evolution during FSW/FSP of alloys is necessary. Recent investigations show that dynamic restoration phenomenon can occur due to the coexistance of strain and heat, during FSW. Also, some investigators believe that static restoration phenomena can occur. The type of restoration phenomena depend on material properties and procedure, whose management can control the microstructure of joints or processed metals, and hence their mechanical properties. In this chapter, the microstructural concepts including different microstructural zones, types of microstructural studies and different restoration phenomena are described. Then, microstructural evolution during FSW/FSP of different metals and alloys is discussed. Moreover, some illustrative examples are added to the end of each section.