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The high-temperature strengths of artificial metal-matrix and unidirectionally solidified eutectic composites are reviewed, emphasis being placed on the structure stability during high-temperature app...lications. Coating of the surface of reinforce components with chemically stable materials is effective to constitue a diffusion barrier and diminish the undesirable interaction of the reinforce components with matrix. Many voids form at the reinforcement/matrix interface during application due to the difference in thermal expansion between the component phases, which leads to a decrease in effective bounding area at the interface. The void formation strongly depends on the intermediate heat treatment during application. It is also important for unidirectionally solidified composites to produce a uniformly alogned structure without any faults such as terminations and fault lines of the reinforce components, because the structure degradation occurs preferentially at the faults.続きを見る
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