Composite design of multivariate multiscale reinforced titanium matrix composites

With the development of China's aerospace and aviation technology, the requirements for structural materials in harsh service environments, such as toughness, are increasing. Among many materials, discontinuously reinforced titanium matrix composites have gradually become a hotspot for researchers because of their advantages of low density, high strength, high stiffness, high specific modulus, and good high temperature resistance, etc. After more than 30 years of research and optimisation, multiple multi-scale reinforced titanium matrix composites have been developed. After more than 30 years of research and optimisation, many mature titanium matrix composites systems have been developed, and the comprehensive performance of the materials has made great breakthroughs. Compared with the titanium alloy matrix, the use temperature of titanium matrix composites can be increased by 100~150℃ through reasonable design and processing, and the strength can be increased by more than 100 MPa at the same temperature, which is expected to replace the traditional high-temperature metal materials in high-temperature service environment to achieve weight reduction.
In recent years, the proposal of new material design theories such as multivariate multi-scale reinforcement and bionic structure reinforcement has provided new research ideas to further optimise the performance of titanium matrix composites, and the preparation methods of multivariate multi-scale reinforcement of titanium matrix composites that are more mature in application at present are mainly in-situ autogenous and powder metallurgy. In situ autogenous technology can make micro/nano reinforcement uniformly distributed in the matrix and obtain excellent interfacial structure and interfacial properties !0; powder metallurgy technology can make the reinforcement unevenly distributed in the matrix with a certain structure by pre-design such as mixing and laying down powder, which increases the designability of the material . Therefore, these 2 processes have achieved a wide range of applications in the field of titanium matrix composites preparation.
In this paper, we will review the current status of research and application of titanium matrix composites from the aspects of composite design ideas, advanced processing technology, mechanical properties and engineering applications of multivariate multi-scale reinforced titanium matrix composites, and put forward the potential research direction of this material, with a view to further improving the comprehensive performance of titanium matrix composites, solving the processing problems of titanium matrix composites and thus promoting the titanium matrix composites "The integrated development of design, preparation, forming and application of titanium matrix composites.
China's titanium matrix composites after a long period of research and development, already has a mature material system and preparation technology, the comprehensive performance of the material has been greatly improved. In order to further improve the comprehensive performance of titanium matrix composites, to solve the processing problems of titanium matrix composites, so as to achieve the integration of titanium matrix composites "design-preparation-forming-application", the future direction of the research and development trend should be focused on the following points.
(1) "micro-nano + configuration" toughening design: through the design of titanium matrix composite reinforcing body type, size, distribution and structure, to achieve orderly non-uniform distribution of the reinforcing body, play the role of reinforcing body scale and configuration synergistic toughening, to break through the composite material strength-plastic toughness of the inversion of the limitations of the stability of the material properties, develop a new type of high strength and high toughness titanium matrix composites. A new type of high-strength and high-toughness titanium matrix composites is developed.
(2) Achieve precision forming and precise control of organisation by intelligent thermal processing technology: deepen the research on the thermal processing process and mechanism of titanium matrix composites, investigate the influence of reinforcement, initial organisation, internal configuration and other factors on the thermal deformation mechanism of titanium matrix composites, establish a complete thermal processing system, achieve precise control of composite material organisation, and push forward the application of isothermal forging technology in the preparation of large-size structural materials. Application.
(3) Stabilized preparation of high-end high-performance components of titanium matrix composites: exerting the advantages of preparation technology and advanced processing means, adopting the combination of in-situ autogenous technology, laser cladding technology and additive manufacturing technology (3D printing) to develop the preparation and post-processing technology of composite materials such as precision tiny components, structurally complex components and other high-end components, so as to make titanium matrix composites meet the needs of cutting-edge fields in terms of performance and precision. requirements in cutting-edge fields.
(4) Develop low-cost and high-performance titanium matrix composite materials preparation and processing technology, improve the rate of material, reduce the threshold of the use of titanium matrix composite materials, and realise the application of titanium matrix composite materials from the field of military industry to the field of civil industry.