Interfacial Shear Strength Measurements of SiC Fiber-Reinforced Titanium Composites

A continuous loading push-out test technique was used to measure the interfacial shear strength of SiC fiber reinforced Ti matrix composites. The interfacial shear strength of samples as-fabricated and after heat exposed at 700 and 800 degrees C for 50 h was successfully determined. It has been found that the interfacial shear strength of the specimen exposed at 700 degrees C was higher than that of as-prepared and exposed samples at 8000C. The shear strength of the as-prepared samples was about 112.45 MPa, and increased to about 153.77 MPa after heat-treating at 700 degrees C for 50 h, but decreased to 133.11 MPa after treating at 800 degrees C for 50 h. Scanning electron microscope (SEM) was used to investigate the interfacial morphology of the samples. The brittle phase was the main products of interface for samples exposed at 800 degrees C, and the interface was easily peeled off.