Interface Reaction And Mechanical Properties Of SiC_f/Ti60 Composites

Because the continuous Si C fiber reinforced titanium(Si C_f/Ti)matrix composite has higher specific strength,high specific stiffness,high temperature resistance and creep resistance than traditional titanium alloy and nickel alloy.As a new type of lightweight and high-strength structural material urgently needed for the development of advanced equipment,it is made into structural parts such as connecting rods,tube shafts,blades,blades and blade rings,which has significant weight reduction and enhancement effects.Ti60 alloy is another new type ofαhigh-temperature titanium alloy developed based on foreign IMI834 grade titanium alloy.Like other high-temperature titanium alloys,Ti60 alloy also has excellent high-temperature heat resistance and can be used for a long time at 600°C as a matrix of Si C_f/Ti matrix composites.In addition,Ti60alloy as the backbone material of the compressor disk,the ring part prepared by Si C_f/Ti60 composite material replaces the traditional Ti60 alloy disc part,which can greatly improve the mechanical properties of the workpiece and further reduce the weight of the engine.This article is based on the Si C_f/Ti60 composites were prepared by magnetron sputtering precursor wire method and hot isostatic pressing(HIP)under different forming temperature conditions.The morphologies of the interface reaction layer after forming were observed and analyzed.The results showed that the internal elements of Si C_f/Ti60 composites participated in the interface interdiffusion and matrix phase change diffusion at the same time during HIP.After hot isostatic pressing,the product of interface reaction layer of Si C_f/Ti60 composite is mainly Ti C.In this paper,the tensile properties and fracture mechanism of Si C_f/Ti60composites are studied,especially the influences of HIP forming temperature and test temperature on the tensile behavior are revealed.Through the comparative analysis of the tensile properties,fracture morphology and the internal damage of the three molding process composite materials,the chamber and high temperature tensile fracture mechanism of Si C_f/Ti60 composite were found,and the complete process of tensile fracture of the material was clarified.The results show that the tensile strength at room temperature decreases with the increase of HIP forming temperature,but there is no obvious relationship between the tensile strength at 600℃and HIP forming temperature.Under tensile loading,“relatibridging”is the most typical fracture mechanism of this composite,and the matrix cracks show the characteristics of network.Microscopically,the crack initiated in the interfacial reaction layer and then propagated into the matrix.In general,the failure of matrix preceded the fracture of fiber,and the failure of the canning occurred after the fracture of composite core.