钛合金与钛基复合材料第二相强韧化

Titanium alloys have been extensively used in the fields of aerospace, sailing, transportation et al. due to their high specific strength and corrosion resistance. To further enhance their high temperature durability, modulus, wear resistance and strength for more application, the secondary phase was introduced into titanium alloys by alloying and composite methods. The alloying method can generate solid solution strengthening effect, the secondary phase strengthening effect and grain refinement toughening effect. In addition, dislocation strengthening effect can be obtained by deformation. The composite method can effectively enhance the strength but sacrifice their ductility by introducing micro-scale reinforcement. It is fortunate to find that the problem of the composite low ductility can be solved by tailoring reinforcement distribution. The prepared composites with quasi-continuous single network microstructure, two-scale network-network microstructure or laminate-network microstructure exhibited superior mechanical properties at both room temperature and high temperature. Therefore, the composites can effectively support weight loss design of aerocraft, which will attract extensive application prospects in the fields of aerospace et al. The mechanical properties of titanium alloys and titanium matrix composites will be remarkably enhanced based on multi-scale hierarchical microstructure design and optimization. The corresponding theory calculation, numerical simulation, high-flux fabrication technology, toughening mechanisms, the forming technique and application will be the next research points.