Abstract
A ceramic–intermetallic composite of Ti 5 Si 3 with 40 vol.% TiAl was synthesized by mechanical alloying and hot isostatic pressing. The microstructure consisted of equiaxed grains of γ-TiAl and ζ-Ti 5 Si 3 with a size of about 400 nm. This composite exhibited a tensile elongation of 150% at 950 °C, using a strain rate of 4 × 10 −5 s −1 . This temperature for superplastic deformation is just about 0.5 T m , the lowest normalized superplastic temperature reported for any ceramic-based material.
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