Abstract
Silicon carbide matrix composites reinforced by continuous S i c fibers are currently being considered for high temperature applications such as aerospace components, gas turbine energy conversion systems and nuclear reactors, because of high specific strength at elevated temperatures, fracture toughness compared with monolithic ceramics. It is important to evaluate creep properties under tensile loading to a S i c fiber to apply a structural component. However, we have little knowledge on microstructure of that, especially grain boundary. Recently, a simple fiber bend stress relaxation (BSR) test was introduced by J. A. DiCarlo. Interpretation of the fracture mechanism at the grain boundary is also essential to improve mechanical properties. In this paper, effects of applied stress by BSR test on microstructural evolution in advanced S i c fibers are described and discussed with our results of microstructure analysis in an atomic scale by using advanced microscopy.
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