Abstract
The superplasticity of metal matrix composites is introduced along with production methods for superplastic composites. Composites are strengthened by particles or fibers and usually have poor ductility, so superplastic composites (which were discovered in 1984) are definitely unusual. Superplasticity in MMCs occurs at high strain rates and at high temperatures near the solidus line of the matrix alloys. The strain rate is 100–1,000 times faster than that required to produce superplasticity in alloys. In this chapter, the mechanism of superplasticity is discussed using constitutive equations, where the shapes of the reinforcements are limited to particles or short, fine fibers. Equal channel angular pressing is introduced as one production method for superplastic MMCs.
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