Short-time creep behavior of (TiB + TiC+Y2O3) reinforced titanium matrix composite in the range of 600 C to 700 C

A titanium matrix composite reinforced by TiB, TiC and Y2O3 was prepared by induction skull melting. The creep behavior of the composite was tested at the temperature range from 600 degrees C to 700 degrees C in short time to investigate the deformation mechanism and microstructure involution. The as -cast composite shows a typical basket -weave microstructure. At the stress of 150 MPa, the stress exponents of the composite are 3.48 at 600 degrees C and 5.33 at 700 degrees C, corresponding to the deformation mechanism mainly controlled by solute -dragging and dislocation climbing respectively. Reinforcements added hinder dislocations movement effectively, which improves the creep resistance of the composite. As the creep temperature rises, the solubility of beta-Ti increases, accompanied by the precipitation of silicides with different morphologies. Silicides play a role in pinning dislocations and hindering interface from migration. The dislocation movement and rearrangement during creep lead to the formation of sub -grains.