ABSTRACT
Fiber-matrix interface plays a critical role in the performance of Titanium Matrix Composites. The size and composition of the reaction zone at the interface affect the mechanical properties of the interface. Post-processing heat treatment is one of the ways to modify the interfacial conditions. In this study, SCS-6/Timetal-21s metal matrix composite is exposed to near consolidation as well as other temperatures closer to service conditions, for varying periods of time. The thickness of the reaction zone, and reaction products, are evaluated using metallurgical techniques. Fiber push-out tests are used to characterize the mechanical properties of the interface. A novel computational method is used to simulate the propagation of interfacial cracks during the tests. The fracture toughness of the interface is evaluated from the experimental data using this model. A relationship between the temperature and the time of exposure to changes in mechanical and fracture properties of the interface is established.
