Matrix flow and densification during the consolidation of matrix coated fibres

The consolidation of titanium alloy metal matrix composites from matrix coa ted fibres has been modelled using a continuum finite element approach. Pre dictions of time to achieve full density are in good agreement with experim ental data. The predicted matrix flow has been compared with metallographic sections from samples containing novel yttria marker layers, to allow meas urements of actual flow during densification. These results are also in goo d agreement with the predictions df the model. Densification is shown to be strongly influenced by temperature and pressure consistent with the matrix constitutive law used. However. densification is almost independent of fib re volume Fraction in the range 10-50% by volume. Densification is most rap id when a uniform densifying pressure is applied, any increase in deviatori c component for the same mean pressure leads to a decrease in densification rate. (C) 2000 Acta Metallurgica Inc. Published by, Elsevier Science Ltd. All rights reserved.