Abstract
Microstructures, mechanical properties of reactive melt infiltration (RMI) derived C/C-SiC-Cu3Si composites with plain-weave fiber fabrics as reinforcement before and after exposure to tensile fatigue stresses have been investigated. Results show that C/C-SiC-Cu3Si composites have good resistance with fatigue limit of 65 MPa, about 72% of quasi-static tensile strength of virgin specimens. Moreover, strength enhancement at expense of slightly decreased elastic modulus is observed in post-fatigue specimens during quasi-static loading. Residual tensile strength after fatigue loadings with 65 MPa for 105 cycles increases to 104 MPa, about 15.5% higher than that of virgin specimens. Microstructural analysis regarding to crack density and fractured surface indicates that crack multiplication and propagation together with interfacial debonding as the most pronounced fatigue damages are responsible for the higher strength after fatigue tests.
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