Flow stress behavior of 30ZrC_P/W composite under high temperature compression deformation

High temperature compressive experiments of 30ZrC_P/W composite at 10^-3 s^-1-1 s^-1 and 800°C-1200°C were performed on Gleeble-1500D thermal simulation device. The flow stress behavior of the composite was studied. The experimental results indicate that the flow stress of the composite decreases with the increasing of deformation temperature, and the compressive strength is 948.7 MPa at 1200°C and 10^-3 s^-1. At 800°C, the plastic deformation of the composite does not accomplish the pre-set strain, and the plastic character in true stress-true strain curves is pseudo-plasticity, which is caused by the behavior of microcracks initiating-passivating. Dynamic recovery and recrystallization of the composite generate with the increasing of deformation temperature. The shapes of true stress-true strain curves transform from serration to smoothing with the increasing of strain rate. The composite has lower sensitivity to strain rate, and the flow stress of the composite increases with the increasing of strain rate, though the increment is little. The compressive strength is 1176.9 MPa at 800°C and 1 s^-1. The deformation activation energy of the composite is 811.4 kJ/mol at 1000°C-1200°C from Arrhenius equation.