Hot deformation and dynamic recrystallization of SiCW/AA2124 composites

Hot deformation behaviors of 15 vol. % SiCw reinforced AA2124 matrix composites and AA2124 matrix alloy were investigated by hot torsion tests performed at temperatures from 200 degrees C to 530 degrees C, and strain rate from 1.32 x 10(-3)/sec to 2.38/sec, respectively. Detailed analyses of now curves and deformaton microstructures were made to identify the hot restoration mechanism of these materials and the critical strain(epsilon(c)) for the dynamic recrystallization was evaluated from the work hardening rate(theta) vs. effective stress(sigma). The grain size D could be expressed in terms of temperature compensated strain rate Z. The superplasticity-like behavior was obtained at the strain rate of 7.94 x 10(-2)/sec and at the temperatures around 500 degrees C.