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Abstract
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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.
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