Processing Map of 14% SiC/7A04 Aluminum Matrix Composites

The hot deformation behavior of 14% SiC particle reinforced aluminum matrix composites produced by stir casting was investigated with compression tests on a Gleeble-3500 simulator,and processing maps were developed using the principles of dynamic materials models.The tests were performed in temperature range of 300-450 ℃ and strain rate range of 0.001-1 s-1.The results indicated that steady-state flow characteristics existed during hot compression deformation of the composite under the test conditions,and the flow stresses decreased with increasing temperature and decreasing strain rate.When the strain rate reached 1 s-1,adiabatic temperature rise during testing was considerable and increased with increasing strain.The processing maps illustrate that the optimum working region was at the temperature range of 400-450 ℃ and strain rate range of 0.001-0.01 s-1.Two domains of unsafe regime were also identified.