Abstract
The effect of long-term high-temperature exposure on the interfacial properties of a typical SiC continuous fibre-reinforced titanium alloy was investigated. Specimens were annealed in air and in vacuum under simulated operating conditions using temperatures up to 500 °C for times up to 700 h. The interfacial chemistry and fracture morphology of the specimens were determined using Auger and scanning electron microscopy. It was shown that high-temperature long-term exposure to air resulted in embrittlement of the fibre-matrix interface through combined oxidation and attack of the Ti matrix on the fibres and fibre coating. Exposure to operating temperatures in vacuum did not lead to a significant degradation of the interfaces. The degradation of the interfaces in high temperature service can lead to a reduction of the service life of components made of reactive system metal-matrix composites such as SiC-reinforced Ti alloys.
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