The hot-deformation behavior of composites consisting of an AA2124 matrix reinforced with 15 vol% of SiC whiskers has been studied over a temperature range of 200 to 530°C and a strain rate range of 1.32 10 - 3 to 2.38 s - 1 . Detailed analyses of flow curves and deformed microstructures were made to identify the hot-recovery mechanism of the composites. The critical strain, ε c , for dynamic recrystallization of the composites was also evaluated by the work-hardening rate, θ, and effective stress, σ, from the flow curves. It was found that the hot-recovery mechanism of the composites was dynamic recrystallization and the addition of SiC whiskers promoted nucleation of the dynamic recrystallization. The relationship between the critical strain, ε c , and peak strain, ε p , of the composites was ε c ap; 0.52ε p .