Establishment of Processing Maps for 25vol.% B4CP/AA6061 Composite and Its Application in Hot Pack-Rolling Process

The hot workability and hot pack-rolling process of B 4 C P /AA6061 composite were studied. The results showed that the addition of B 4 C particles could effectively promote the dynamic recrystallization (DRX) process of the composite. DRX and DRX grains growth were dominant deformation mechanism during hot deformation of B 4 C P /AA6061composite. Typical instability defects included micro voids and particle aggregation. The optimum processing parameters for good workability were obtained in the temperature range of 450°C-500°C and strain rate range of 0.01s -1 -0.1s -1 . According to the flow stress curves and processing maps, a temperature of 500°C and a rolling velocity of 40 mm/s were chosen for pack-rolling experiments. The pack-rolled composite sheets in the RD and TD showed more homogeneous DRX grains than as-HIPed microstructures, which might indicate that hot pack-rolling could lead to more homogeneous microstructures without any edge cracking and surface cracking.