Microstructures and Mechanical Properties of TiB/Ti-55531 Composite Material with Hot-Rolling Deformation AITranslate

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Basic Information:

DOI：10.13373/j.cnki.cjrm.XY23090007

Chinese Library Classification Number:TB333.1+2

Citation Information:

Titanium matrix composites，which can effectively combine the good plasticity of titanium alloy matrix with the high strength and high modulus characteristic of reinforcement phase by introducing an appropriate amount of hard reinforcement phase into titanium or titanium alloy，possess so many advantages such as high specific strength，high specific stiffness，excellent plasticity，and good corrosion resistance，demonstrating broad application prospects in aerospace filed. Melt casting method is widely used in the preparation of titanium matrix composites，that can realize the insitu self-generation of reinforcement phase through the chemical reactions between components，and maintain a good interfacial bonding between the reinforcement phase and alloy matrix，avoiding the adverse influence of oxide pollution in interface caused by external addition on its microstructures and mechanical properties. However，the microstructures of titanium matrix composites prepared by in-situ melt casting method is coarse and the distribution of reinforcement phases is uneven. Therefore，it is necessary to optimize the microstructure and morphology by combing thermal mechanical treatment such as forging，rolling and extrusion with heat treatment to achieve favorable matching of comprehensive mechanical properties. The literature indicated that the material was in three-dimensional compressive stress state during hot rolling deformation，which could utilize the good plasticity of alloy matrix and obtain a large amount of deformation. While the reinforcement phases could achieve relatively uniform distribution following the plastic flow of alloy matrix over a large rang. Recently，the researches on titanium matrix composites in the industry were mainly focused on α and α+β titanium alloys，and its microstructures and mechanical properties were mainly controlled by a single thermal mechanical treatment. There were few reports about near β titanium matrix composites，and the influence of hot rolling coupled forging thermal mechanical treatment on reinforcement phase distribution and microstructures and properties of titanium matrix composites was still unclear. Accordingly，the effects of hot-rolling deformation on microstructures，mechanical properties and work hardening rates of insitu 2%TiB/Ti-55531 （volume fraction）composite material forging stocks were investigated，which were obtained by vacuum consumable arc melting and near-isothermal thermal plastic deformation. The results showed that TiB enhanced phases were broken and distributed directly after hot-rolling deformation in α+β phase region and the fine acicular α phases dispersed in β phase matrix re-dissolve mostly，while the spherical and rod-like α phases precipitate，which resulted in the increase of plasticity and the decrease of strength and work hardening rate. After suffering the solute and aging heat treatment，the morphologies of TiB enhanced phases in the rolled TiB/Ti-55531 composite material microstructures changed little，and the spherical and rod-like α phases grewup and connected into mesh along the crystal boundary in the local area while the fine needle-like secondary α phases were precipitated which obviously optimized the strength and plasticity of rolled composite materials. Its tensile strength，yield strength，and elongation after fracture were 1444.3 MPa，1415.8 MPa and 10.3%，respectively，which achieved favorable matching of strength and plasticity. Otherwise，the annihilation of residual dislocations in TiB/Ti-55531 composite material microstructure was promoted by solute and aging heat treatment which resulted the significant reduce of initial work hardening rate and it was slower than Ti-55531 alloy matrix undergoing the same process program gradually and approaching 0 state quickly with the development of plastic deformation. Electron back-scattered diffraction （EBSD）characterization analysis and kernel average misorientation （KAM）statistical distribution of different pre-deformations indicated that the rolled TiB/Ti-55531 titanium composite material after solute and aging heat treatment had a higher geometric dislocation density than Ti-55531 alloy matrix under low plastic deformation，while it gradually decreased with the continuous plastic deformation and lower than Ti-55531 alloy matrix which was consistent with the variation of work hardening of TiB/Ti-55531 titanium composite material with plastic deformation as mentioned above.