Preparation and characterization of novel Ti(Al)-TiB2/Ti3Al metallic-intermetallic laminated composites

摘要

In this paper, we designed and prepared Ti(Al)-TiB2/Ti3Al laminated composites consisting of alternating Ti(Al) layers and TiB2/Ti3Al layers, which were realized by using Ti foils and TiB2/Al composite foils as raw materials, stacking, and reaction annealing. Phase transformation and microstructure evolution of laminated composites during reaction annealing were systematically investigated by means of optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray diffraction (XRD). Formation mechanism of laminated structure was elucidated in details. The results showed that Ti(Al)-TiB2/Ti3Al laminated composites exhibited a significant increase in ductility while maintaining or even improving the tensile strength, in comparison with monolithic Ti3Al. It is expected that the design strategy can be extended to other brittle intermetallic compounds, such as Ni-Al and Fe-Al systems.