基于韧脆复合结构的Ti-Al-Ti-Ti2AlNb层状复合材料的组织与力学性能

Based on the ductile-brittle composite principle of biomaterials, Al foils, Ti foils and Ti2AlNb foils were stacked in a certain order, and Ti-Al-Ti-Ti2AlNb laminated composites were prepared by vacuum hot pressing sintering. The microstructure was analyzed by SEM and XRD, and the flexural and compressive properties were also analyzed. Results show that the laminated composites are composed of Ti, a series of TiAl intermetallic compounds and Ti2AlNb combined with obvious hierarchical structure and clear interface. The flexural strength and compressive strength are 1231±71 MPa and 1341±63 MPa, respectively, which have significant advantages over similar materials. The analysis shows that the existence of laminated structures plays an important role in preventing expansion of crack. Compared with the conventional binary TiAl layered materials, the existence of Ti2AlNb layers significantly improves the mechanical properties of the materials.