Abstract
In Chapter 2, the effect of friction stir processing (FSP) on microstructural refinement in cast metallic systems was discussed. Microstructural modification and refinement leads to significant enhancement in both quasistatic (tensile) and dynamic (fatigue) properties. The greatest impact of FSP is on tensile ductility. Elimination of porosity, refinement of second-phase particles, removal of dendritic structure, etc. lead to dramatic improvement in tensile ductility in cast alloys. In general, there is also improvement in yield strength and tensile strength after FSP. In the following sections, the effects of FSP on mechanical properties in different cast alloy systems are discussed in more detail.
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