| Aluminum matrix composites reinforced with stainless steel and high carbon steel fibers have been fabricated by liquid casting method, and the effect of surface coating of fibers on the fatigue behavior has been investigated. Interfacial reaction zone is formed for all specimen, and various intermetallic compounds were observed at interfaces ; A1₂Cu, Al₄Cu_9, AlNi, AlFe and Al_5Fe₂ were identified by electron diffraction. For the composites reinforced wish uncoated fibers, 10＾6 cycle fatigue strength is close to the calculated value based on the rule of mixture. The composites reinforced with Ni or Cu-coated fibers show slightly higher fatigue strength than those calculated by the rule of mixture. The composites reinforced with Cu-coated fibers shows the best fatigue characteristics among studied samples. Initial cracks are formed around the metal-fiber interface, and propagate toward the matrix. |
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