High temperature deformation behavior of Al 2124-SiCp composite

The high temperature deformation of 2124/SiCp (17 vol.%) Composite material was investigated over the temperature range from 698 K to 823 K. It was shown that the 2124/SiCp composite did not behave superplastically at strain rates of from 10(-4) to 10(-1) s(-1). The strain rate sensitivity was found to be about 0.17, which was apparently below that (0.5) of a superplastic material. The activation energy for high temperature deformation was much greater than that of superplastic aluminum alloys. Numerous cavities on the fracture surfaces of the composite were observed by SEM. The high-temperature deformation of the composite was compared with superplastic behavior of 8090/SiCp composite, and the reasons for the 2124/SiCp composite not showing superplastic properties were explained according to superplastic deformation mechanism and the composite itself.