Effect of Interfacial Reaction on High Temperature Properties ofFe-Cr-Si Fiber Reinforced AC8A Aluminum Composites

摘要

Metallic fibers (Fe-Cr-Si) with an excellent high temperature strength are expected to beuse as a reinforced material of the engine piston head. However, the high reactivity of Al with mostmetals has disturbed the use of metallic fibers in aluminum composites until now. In this study, theinfluence of the reaction products at the fiber/matrix interface on high temperature properties of thecomposites was investigated by different solution treatment conditions. It is found that hardness andstrength increase with an increase the solution treatment temperature (Tst). Reaction products (Al-Feintermetallic compounds) resulting from solution treatments were formed along the fiber/matrixinterface at 773 K or higher. The composites without interfacial reaction products (Tst=763 K)showed excellent rotating-bending fatigue life at 573 K. The fatigue crack propagation in thiscomposite occurred at the necking region of the metal fiber because no cracks were observed in theinterfacial reaction products.