Dynamic Softening of Al-18Si Composite during Hot Deformation

초록

The high-temperature deformation behavior of Al-18wt.%Si composite was studied by torsion tests in the temperature range of 350 - 500℃ and the strain rate range of 1x10-3 - 1x100/sec. The metal matrix composite showed the characteristics of dynamic softening transition. The transition from dynamic recovery (DRV) to dynamic recrystallization (DRX) occurred at the deformation conditions of 400℃ and 1x10-2 - 1x10-1. Also, the dynamic transition behavior was investigated with multi-pass deformation test. The relationship among the processing variables, strain rate (e), temperature (T) and flow stress (s), can be expressed as constitutive equations that can be considered with the transition behavior.