The microstructure evolution and endurance and creep deformation behavior of TiB_w/TA15 composites during solution–aging heat treatment were studied. The results demonstrate that the silicide morphology, size and precipitation location are affected by temperature, time, crystal defects and endurance and creep deformation process during the heat treatment. High aging temperature, long aging time and the existence of crystal defects such as dislocations after heat treatment are the main causes for the precipitation and aggregation of large-grained silicide. Properly increasing the aging temperature will help to achieve fine dispersion and precipitation of the α₂ phase, and the α₂ phase tends to coarsen and aggregate when the aging time is prolonged. After heat treatment, the endurance and creep properties are affected by the silicide and α₂ phase, among which, the silicide with large amount of precipitation and large size shortens the endurance time of fracture of the composite. The dislocations occurring in the durable deformation process mainly occurs in α layer, which would be impeded by the intragranular α₂ phase and its whiskers. The crack propagation caused by whisker fracture during durable deformation process is the main reason why the general endurance time of fracture of the composite is short.
At the testing conditions of 650 ℃ /100 MPa/100 h, the creep process of TiB_w/TA15 composite is mainly affected by dislocations exiting in intragranular α and β phases and the interactions between precipitations and dislocations.