INTERFACIAL PROPERTIES OF Ti-6Al-4V/SCS-6 CONTINUOUS FIBRE REINFORCED COMPOSITE

摘要

A study of the interfacial properties of a SiC (SCS-6) fibre reinforced Ti-6A1-4V metal matrix composite has been carried out using a fibre push out technique. Material in the as received condition, heat treated at 30Q°C, and some fatigue damaged conditions were considered. Fatigue was performed in 3-point bending at two initial ΔK_(app) levels at both room temperature and 300°C. To investigate the effect of fatigue on the interfaces, samples were taken from immediately next to the fatigue crack plane, as well as from three positions at increasing distances from the crack plane. Interfacial properties were significantly reduced by fatigue. Interfacial properties after fatigue were lowest close to the crack plane, and increased at distances further from the crack plane. In the as received condition interfacial debonding occurred between the fibre coating layers. However fatigue and heat treatment caused interfacial damage and promoted debonding between coating layers and within the reaction zone.