Modelling Consolidation of Ti-6Al-4V / SiC Matrix-Coated Fibre Metal Matrix Composites

A numerical, quantitative model has been developed for the solid-state consolidation of continuous Matrix-Coated Fiber (MCF) Metal Matrix Composites (MMC). The model is based on a Finite Element Model (FEM), taking into account plastic flow and power-law creep of the matrix as main consolidation mechanisms. Both a hexagonal and a square fiber stacking symmetry were investigated at different consolidation temperatures and pressures. The FEM model was used to evaluate the stress-strain relationship during consolidation and the creep behavior of the matrix. Using FEM it as possible to determine local stress/strain maxima as a function of the consolidation time, temperature and pressure. It was possible to predict the necessary consolidation time for a given set of consolidation parameters to obtain a fully dense composite. It was hence possible to predict optimum parameters and thus avoid unnecessary damage to the fiber and the fiber coating. The results obtained from the modeling simulations showed good agreement with the experiments which were conducted as a verification program using Scanning Electron Microscopy of special market samples.