The superplastic characteristics of a 15% (volume fraction) SiCp (14μm)/6A02Al composite, fabricated by stirring casting and cold-rolling after extrusion with a lowextrusion ratio of 10:1 and hot-rolling, were invest...The superplastic characteristics of a 15% (volume fraction) SiCp (14μm)/6A02Al composite, fabricated by stirring casting and cold-rolling after extrusion with a lowextrusion ratio of 10:1 and hot-rolling, were investigated. The composite exhibits a tensileelongation of 250% at an initial strain rate of 8.9 x 10^(-4) s^(-1) and at 833 K where anappropriate amount of liquid phase is presented in the composite. The superplastic deformation isuniform and the strain hardening exponent γis as high as 1.6. The fracture surface is intergranualand the superplastic deformation mechanism of the composite is considered to be grain boundary(interface) sliding accommodated by an appropriate amount of liquid phase.展开更多
文摘The superplastic characteristics of a 15% (volume fraction) SiCp (14μm)/6A02Al composite, fabricated by stirring casting and cold-rolling after extrusion with a lowextrusion ratio of 10:1 and hot-rolling, were investigated. The composite exhibits a tensileelongation of 250% at an initial strain rate of 8.9 x 10^(-4) s^(-1) and at 833 K where anappropriate amount of liquid phase is presented in the composite. The superplastic deformation isuniform and the strain hardening exponent γis as high as 1.6. The fracture surface is intergranualand the superplastic deformation mechanism of the composite is considered to be grain boundary(interface) sliding accommodated by an appropriate amount of liquid phase.
