Compatibility of SiC fiber for continuous fiber-reinforced TiAl matrix composites

Abstract

A SiC_CVD fiber-reinforced TiAl matrix composites was fabricated by the sintering process. The compatibility of the strengthening fiber for the composites was investigated. The interfacial strength between the fiber and the matrix of the composites was improved by using the coated TiAl layer onto the SiC_CVD fiber by the ion plating process. The interfacial shear strength was within the range of 160 MPa to 320 MPa. The coefficient of thermal expansion from 300 K to 1113 K was 11 × 10⁻⁶K⁻¹ in the longitudinal direction, and was equivalent calculated values by the rule of mixture. The residual expansion was scarcely observed after the thermal cycling between 300 and 1113 K. However, the strength of extracted fiber from the composites was 3.1 GPa, decreased by 50% with the fiber strength of the as-received fiber.