2011 Volume 52 Issue 9 Pages 1728-1733
The effects of β and TRIPLEX heat treatment on the microstructure, tensile properties and fracture toughness of in situ synthesized (TiB+La2O3)/Ti composite were studied. TRIPLEX heat treatment was beta solution plus alpha–beta annealing plus aging. The microstructure of materials after β and TRIPLEX heat treatment was widmanstätten. Compared with β heat treatment, the length of laminar α after TRIPLEX heat treatment was longer, the α+β colony width was thinner. The width of laminar α after TRIPLEX heat treatment followed by oil quenching was coarser than that after water quenching. Compared with β heat treatment, the ductility of specimens after TRIPLEX heat treatment (oil and water quenching) was improved significantly. The fracture toughness of composite treated by TRIPLEX heat treatment was better than those by β heat treatment. The composites after TRIPLEX heat treatment (oil quenching), had the best tensile properties and fracture toughness.
