High temperature creep resistance of metal matrix composites

Abstract

A new approach to the effective creep resistance of two phase composites at high temperature has been developed through direct analogy between creep resistance and field properties (or transport properties). The new approach can take into account implicitly the effects of size, shape, orientation, and distribution of the reinforcement through the topological parameters. Therefore, it can be applied to a two phase composite containing particles with any size, shape, orientation, and distribution. Compared with Saltzer and Schulz's model, which can only be applied to composites with low volume fraction of the reinforcement, the present approach can predict the variation of creep resistance of two phase composites over the whole range of microstructures (from completely discontinuous to completely continuous) and volume fractions, and more importantly is in better agreement with experimental results. In addition, the effect of particle distribution on the effective creep resistance of two phase composites has been demonstrated quantitatively. The effective creep resistance increases with increasing contiguity of the reinforcing phase.