Since global warming has been received attention, regulation of greenhouse gases emission which gases cause the global wanning severely such as CO_2, and the minimization of environmental impact are key issues. Generally, replacement the existing steel materials to the light materials and the improvement in efficiency by the development of functional materials have been studied to deal with the issues. For this reason, the fabrication of the metal matrix composites(MMCs), which have attractive physical and mechanical properties such as high specific modulus, strength, and thermal stability has been considered]!]. Recently, one of new methods for fabricating the composites, friction stir processing(FSP) is a variant on friction stir welding(FSW), has been paid attention as a method of improving microstructures in a variety of materials[2]. The FSP can be applied to bulk materials, and fabricate composites having uniform microstructure respectively.
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