Ultrahigh-strength heat-resistant titanium-based composite material and preparation method thereof

Abstract

The invention discloses an ultrahigh-strength heat-resistant titanium-based composite material and a preparation method thereof.The preparation method comprises the steps that titanium alloy powder, a reinforcing phase raw material and powder of beta stable elements are subjected to ball milling and mixing to obtain mixed powder, and the content of the beta stable elements in the mixed powder is 0.01 wt.%-9 wt.%; the laser melting deposition additive manufacturing method comprises the steps that mixed powder is conveyed to a molten pool on the surface of a base material through powder feeding airflow, the mixed powder is melted and deposited on the surface of the base material under the action of laser, and the ultrahigh-strength heat-resistant titanium-based composite material is obtained in a layer-by-layer deposition mode. The ultrahigh-strength heat-resistant titanium-based composite material prepared by the preparation method realizes ultrahigh strength, and breaks through the ultimate bearing capacity performance bottleneck of the titanium-based composite material.

Description

Technical Field

[0001] The present invention belongs to the field of advanced manufacturing of metal-based composite materials, and specifically relates to an ultra-high-strength heat-resistant titanium-based composite material and a preparation method thereof. Background Art

[0002] Titanium-based composites (TMCs) have great application potential in high-end equipment fields such as aerospace, national defense and military industry due to their high specific strength, excellent heat resistance and impact resistance. Traditional titanium-based composites usually increase tensile strength by adding ceramic reinforcement phases, but the introduction of reinforcement phases sacrifices plasticity and fracture toughness, resulting in obvious brittle characteristics, which is fatal for engineering applications.

[0003] In the early stage, the spatial distribution of the reinforcement phase of titanium-based composites was designed and regulated based on additive manufacturing technology, and a non-uniformly distributed reinforcement phase structure was successfully constructed in the titanium alloy matrix. Among them, the titanium-based composites with a spatial mesh distribution of the reinforcement phase regulated by additive manufacturing showed good strength and plasticity. However, due to the limited level of controllable reinforcement phase structure and the insufficient strengthening effect induced by a single reinforcement phase strengthening structure in improving the strength of titanium-based composites, titanium-based composites are difficult to meet extreme service environments.

[0004] Therefore, as high-end equipment puts forward higher strength performance requirements for structural materials, it is urgent to optimize the organizational design and regulation methods of titanium-based composite materials to improve the mechanical properties of titanium-based composite materials, especially the ultimate bearing capacity.

[0005] The invention patent application with the publication number CN113373335A discloses a method for preparing a high-strength titanium-based composite material, wherein titanium powder is uniformly mixed with fine aluminum carbide and zirconium boride mixed powder, and a high-performance titanium-based composite material is obtained through forming, sintering, and thermal deformation processes. In the invention, aluminum carbide and zirconium boride react with titanium powder during the sintering process to generate small and uniformly distributed TiC / TiB strengthening particles in situ, refine the grain size, and Al and Zr elements can be dissolved into the matrix to form a solid solution, further strengthening the mechanical properties of the material. At the same time, due to the grain boundary pinning effect of the small and uniform TiC / TiB strengthening particles, high-temperature thermal deformation of the titanium-based composite material can be achieved, the deformation resistance of the material is greatly reduced, and residual pores are eliminated, and finally a high-performance titanium-based composite material product is obtained. The invention emphasizes that in addition to the TiC / TiB particles strengthening the titanium matrix, Al and Zr elements can be dissolved into the matrix to form a solid solution, further strengthening the mechanical properties of the composite material, and realizing the synergy of the reinforcement phase and solid solution strengthening.

[0006] The invention patent application with publication number CN117226086A discloses a high-strength and plastic multiphase heterogeneous titanium-based composite material and its preparation method. The invention adopts Cu-doped CNTs modification, combines the use of titanium alloy powders of different particle sizes to construct a coarse-grained and fine-grained bimodal matrix, and regulates the intergranular nano-reinforced phase TiC and intragranular Ti based on the plasma sintering method. 2 The generation of Cu significantly improves the strength of titanium-based composites.

[0007] It can be seen that on the basis of the reinforcing phase strengthening structure, the matrix phase structure is regulated by alloying to further improve the mechanical properties of titanium-based composites, which has become an effective means to break through the performance bottleneck of titanium-based composites. However, the strength and high-temperature performance of the composites produced by the above patented method still have room for improvement. Summary of the invention

[0008] The present invention provides a method for preparing an ultra-high-strength and heat-resistant titanium-based composite material. The ultra-high-strength and heat-resistant titanium-based composite material prepared by the preparation method achieves ultra-high strength and breaks through the performance bottleneck of the ultimate bearing capacity of the titanium-based composite material.

[0009] The present invention provides a method for preparing an ultra-high-strength heat-resistant titanium-based composite material, comprising: The titanium alloy powder, the reinforcing phase raw material and the β-stabilizing element powder are ball-milled and mixed to obtain a mixed powder, wherein the content of the β-stabilizing element in the mixed powder is 0.01 wt.% - 9 wt.%; Additive manufacturing of titanium-based composite materials by laser melting deposition includes: sending mixed powder to a molten pool on the surface of a substrate through a powder feeding airflow, melting and depositing on the surface of the substrate under the action of a laser, and obtaining an ultra-high strength and heat-resistant titanium-based composite material by a layer-by-layer deposition method.

[0010] By collaboratively designing the spatial distribution of the reinforcement phase and the β-stabilizing elements, the microstructure of the matrix phase is regulated on the basis of the spatial network distribution structure of the reinforcement phase, and a two-level structure of non-uniform network distribution of the reinforcement phase and non-uniform distribution of the matrix phase size is constructed. Compared with a single reinforcement phase structure, by designing a non-uniform structure and increasing the β volume fraction, the upper limit of the tensile strength of the matrix alloy is broken through, broadening the application field of titanium-based composite materials.

[0011] Further preferably, the content of the β-stabilizing element in the mixed powder is 2 wt.% - 6 wt.%. At this content, the β-phase stabilization, solid solution strengthening, and α-phase refinement effects are the best, and the tensile strength of the composite material is as high as 1500 MPa.

[0012] At the same time, further increasing the volume fraction of β phase can make better contributions to solid solution strengthening and grain refinement, activate a larger number of dislocations and slips, and significantly improve the tensile strength. It also avoids excessive content and a high volume fraction of β phase, which will reduce the elastic modulus of the composite material.

[0013] Preferably, the content of the reinforcing phase raw material in the mixed powder is 0.1 wt.% - 3 wt.%, and the size of the reinforcing phase raw material is 1 μm - 10 μm.

[0014] By controlling the content and size of the reinforcing phase raw material, the formed reinforcing phase presents a network structure in the tissue.

[0015] During the solidification and microstructure growth of the molten pool, the initial generation of the reinforcing phase refines the initial β-Ti size and is enriched on the grain boundaries of β-Ti, constructing a spatial network structure of the reinforcing phase, further constraining the solidification of the matrix in the network, promoting α nucleation at the edge of the network structure and hindering its growth, and forming a nanoscale α phase at the edge of the network structure; the addition of β-stabilizing elements significantly increases the activation energy of grain boundary migration, slowing down the growth rate of the α phase, and at the same time, expanding the β phase region can limit the growth of α phase grains, promoting the formation of a nanoscale α phase inside the network structure. It can be seen that under the synergistic effect of the reinforcing phase network structure and β-stabilizing elements, the size of the α phase lath is significantly reduced, and the size non-uniform structure of the matrix phase is constructed.

[0016] When contributing to strengthening, the reinforced phase network structure divides the matrix into modules, constrains matrix deformation, and cooperates with fine grain strengthening and solid solution strengthening to improve the yield strength of the composite material. With the addition of β-stabilizing elements, the volume fraction of the β phase increases, which is conducive to activating more dislocations. The network structure traps dislocations and slips to increase the movement barriers of dislocations, thereby improving the tensile strength of the composite material.

[0017] Preferably, the content of the reinforcing phase raw material in the mixed powder is 0.01 wt.% - 2 wt.%, and the size of the reinforcing phase raw material is 1 nm - 100 nm.

[0018] By controlling the content and size of the reinforcing phase raw material, the formed reinforcing phase presents a network structure in the tissue.

[0019] During the solidification and microstructure growth of the molten pool, the initial generation of the reinforcing phase refines the initial β-Ti size, pins on the grain boundaries of β-Ti or precipitates in small amounts inside the grains, subsequently promoting α nucleation and hindering its growth, and the nanoscale α phase is easily formed near the reinforcing phase; similarly, the addition of β-stabilizing elements significantly increases the activation energy of grain boundary migration, slows down the growth rate of the α phase, and the expanded β phase region further hinders the growth of the α phase grains, resulting in the formation of nanoscale α phase inside the network structure. It can be seen that under the synergistic effect of the reinforcing phase and the β-stabilizing element, the size of the α phase lath is significantly reduced, which is conducive to the construction of a size-inhomogeneous structure.

[0020] When contributing to strengthening, when the reinforcing phase is dispersed, the matrix phase is more short-axised and uniform, which can effectively cooperate with deformation and improve the plastic deformation capacity of the composite material. When the reinforcing phase has a network distribution characteristic, it also plays a role in constraining the deformation of the matrix. The reinforcing phase cooperates with fine grain strengthening and solid solution strengthening to improve the yield strength of the composite material. With the addition of β-stabilizing elements, the volume fraction of β phase increases, which is conducive to activating more dislocations. The reinforcing phase increases the barrier to the movement of dislocations, thereby improving the tensile strength of the composite material.

[0021] Preferably, the reinforcing phase raw material is TiB, TiC, TiN, La 2 O 3 , TiB 2 、Ti 5 Si 3 The reinforcing phase raw material is a compound or single substance particle that can react chemically with the Ti element to generate a ceramic reinforcing phase as a reinforcing phase original additive.

[0022] Preferably, the β-stabilizing element includes one or more of molybdenum, vanadium, niobium, tantalum, iron, copper and silicon.

[0023] Preferably, the power of the laser melting deposition additive manufacturing is 600 W - 1000 W, the printing rate is 500 mm / min - 1000 mm / min, the overlap rate is 35% - 45%, the layer thickness is 0.3 mm - 0.6 mm, the oxygen content is less than 200 ppm, and the argon atmosphere is protected.

[0024] Preferably, the rotation speed of the ball milling is 100-300 r / min. The sphericity of the matrix alloy powder and the β-stabilizing element powder is ensured, and a higher sphericity is beneficial to the powder feeding stability during the printing process.

[0025] Preferably, the mixed powder is placed in a powder carrier tank and formed by laser melting deposition layer by layer according to set parameters to complete the composite material block forming printing.

[0026] Preferably, in the laser melting deposition forming, the laser power is selected to ensure sufficient remelting depth to achieve secondary remelting and homogenization of the reinforcing phase and β-stabilizing elements.

[0027] Preferably, the reinforcing phase is distributed non-uniformly, and by adjusting the parameters of the reinforcing phase, the reinforcing phase is pinned on the surface of the grains to form a spatial network non-uniform distribution structure of the reinforcing phase.

[0028] Preferably, the matrix phase has a non-uniform size distribution, and the formation of a nano-sized matrix phase is promoted by regulating the type and parameters of the β-stabilizing element and the laser melting deposition forming strategy to form a matrix phase size non-uniform structure.

[0029] On the other hand, the present invention also provides an ultra-high strength and heat-resistant titanium-based composite material, which is prepared by the ultra-high strength and heat-resistant titanium-based composite material.

[0030] The ultra-high-strength heat-resistant titanium-based composite material has a tensile strength greater than 1400 MPa, a high-temperature tensile strength of greater than 900 MPa at 400°C, and a high-temperature tensile strength of greater than 750 MPa at 500°C.

[0031] Compared with the prior art, the present invention has the following beneficial effects: The present invention utilizes β-stabilizing elements to expand the β-phase region, promote solid solution strengthening and matrix phase refinement, and increase the number of dislocations that can be activated by controlling the volume fraction of the β-phase. Therefore, the present invention refines the initial β-phase and α-phase by pinning the reinforcing phase on the surface of the grain to form a network or dispersed distribution, and increases the movement barrier of dislocation movement and slip. Then, under the synergistic effect of the β-stabilizing element and the reinforcing phase, during the laser melting forming process, the precipitation and short-axis of the nanoscale α-phase in some areas are promoted, and a matrix phase size non-uniform structure is constructed, which is beneficial to improving the tensile strength and high temperature performance of the titanium-based composite material.

[0032] Based on additive manufacturing technology, β-stabilizing elements, reinforcing phase raw materials and matrix alloy powders are integrated for printing to design and prepare high-strength and heat-resistant titanium-based composite materials. This method has a controllable forming process, uniform element distribution, and a wider range of parameter control, meeting the requirements for customized and rapid development of key complex structural parts in high-end equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a BSE image of the microstructure of the titanium-based composite material prepared in Example 1. In the image, the black on the grain boundary is the reinforcement phase, the matrix α phase is lath-shaped, the white contrast is the β phase, and the nanoscale matrix α phase (white arrow) is surrounded by larger-scale α phase laths or at the edge of the network structure.

[0034] Figure 2 This is a BSE image of the microstructure of the titanium-based composite material obtained in Example 2. In the image, the black on the grain boundary is the reinforcement phase, the matrix α phase is lath-shaped, the white contrast is the β phase, and the nanoscale matrix α phase (white arrow) is mainly at the edge of the network structure.

[0035] Figure 3 : is a SEM image of the microstructure of the titanium-based composite material prepared in Example 4, in which the white particles are the reinforcement phase (white arrows). DETAILED DESCRIPTION

[0036] The present invention is further described in detail with reference to specific embodiments below, so as to facilitate understanding and practice by professionals skilled in the art.

[0037] The β-stabilizing elements provided in the specific embodiments of the present invention can expand the β-phase region and increase the volume fraction of the β-phase. The β-phase is a body-centered cubic (BCC) structure, which has more slip systems than the hexagonal close-packed (HCP) structure of the α-phase, and improves the dislocation movement and slip ability during the deformation of the material. For example, molybdenum (Mo), as an important alloying element in titanium alloys, contributes to the performance mainly in terms of β-phase stability, solid solution strengthening, grain refinement and enhanced thermal stability, especially by stabilizing the β-phase and inhibiting high-temperature phase transformation, and enhancing the high-temperature performance of the material. Therefore, based on the laser melt deposition additive manufacturing technology, combined with the β-stabilizing elements, on the basis of the ceramic reinforcement phase strengthening structure, through the coordinated design of the enhanced phase space structure and the matrix phase microscopic characteristics, a variety of strengthening mechanisms are induced, which can break through the bottleneck of the ultimate bearing capacity and high-temperature performance of titanium-based composite materials.

[0038] Example 1: (1) Material selection: TC4 (Ti6Al4V) titanium alloy is used as the matrix alloy, with a particle size of 50 μm-150 μm, and B 4 C powder is the original additive for the reinforcing phase used for in-situ reaction, and its particle size is 2 μm - 4 μm. 4 The addition amount of C is 0.7 wt.%, and Mo powder is used as a β-stabilizing element additive with a particle size of 50 μm - 150 μm and an addition amount of 1.0 wt.%.

[0039] (2) Preparation of mixed powder: rotation speed 200 r / min, ball milling time 5 h, ball-to-powder ratio 3:1.

[0040] (3) AM parameters: printing power 800 W, powder feeding rate 5%, scanning speed 700 mm / min, layer thickness 0.37 mm, and overlap rate 40%.

[0041] (4) Laser molten deposition forming: The mixed powder is delivered to the molten pool on the surface of the substrate by a powder delivery airflow. Under the action of the laser, the mixed powder is melted and deposited on the surface of the substrate. The passes are staggered and overlapped to form a layer. After printing one layer, the laser head moves up 0.37 mm to print the next layer. The number of printed layers is greater than 100. Ultra-high strength and heat-resistant titanium-based composite materials are obtained by layer-by-layer deposition.

[0042] Figure 1 This is a BSE diagram of the microstructure of the ultra-high strength titanium-based composite material prepared in Example 1. It can be seen that the reinforcement phase (TiB + TiC) obtained by the in-situ reaction is pinned on the surface of the grains to form a network structure distribution; the matrix phase morphology changes significantly, and there are a large number of nano-sized α matrix phases near the reinforcement phase and inside the grains, that is, both micron-sized α matrix phases and nano-sized α matrix phases are formed in the organization, forming a matrix phase size non-uniform structure, thereby improving the tensile strength.

[0043] The tensile strength of the ultra-high strength titanium-based composite material prepared in Example 1 is as high as 1420 MPa, which is significantly higher than the tensile strength of the matrix alloy of 963 MPa, and higher than the tensile strength of the titanium-based composite material strengthened by a single reinforcement phase of 1285 MPa. The high temperature tensile strength at 400°C is greater than 900 MPa.

[0044] The reinforcement phase is pinned on the grain surface, refining the initial β crystal and α phase, and increasing the movement barrier of dislocation and slip; Mo element, as a β stabilizing element, belongs to the β isomorphous stabilizing element, which is infinitely soluble in β-type titanium alloy to form a continuous solid solution, and by adjusting the addition amount, the volume fraction of β phase is increased to improve the dislocation movement and slip ability. During the laser melting forming process, the reinforcement phase and Mo element change the solidification behavior of the matrix phase, promote the short axis of α phase, and are conducive to the precipitation of nano α phase, and construct a matrix phase size non-uniform structure.

[0045] Based on Example 1, the introduction of a non-uniform distribution structure of the reinforcement phase and a non-uniform size structure of the matrix phase into the matrix, coupled with solid solution strengthening of the Mo element, has overcome the problem of limited improvement in tensile strength of traditional titanium-based composite materials, and the present invention has significant effects.

[0046] Example 2: The difference between this example and Example 1 is that the addition amount of Mo is 3.0 wt.%.

[0047] With the increase of Mo content, the microstructure becomes more refined and equiaxed, and the tensile strength of the titanium-based composite material is further improved to 1500 MPa.

[0048] Example 3: The difference between this example and Example 1 is that the addition amount of Mo is 6.0 wt.%.

[0049] The obtained titanium-based composite material has a tensile strength of 1567 MPa.

[0050] Based on Examples 1-3, introducing β isomorphous stabilizing elements to regulate the properties of the matrix phase on the basis of the heterogeneous structure of the reinforcement phase is an effective means to improve the mechanical properties of titanium-based composite materials. In addition, according to our previous research results, the heterogeneous structure of the reinforcement phase network distribution plays a key role in coordinating the microstructure and improving the performance with the β stabilizing elements, because the network distribution of the reinforcement phase constrains the solidification behavior of the matrix phase. It is worth noting that there is a synergistic strengthening effect between the heterogeneous network structure of the reinforcement phase, the heterogeneous structure of the matrix phase and Mo solid solution.

[0051] Example 4: (1) Material selection: TC4 (Ti6Al4V) titanium alloy is used as the base alloy with a particle size of 50-150 μm, B powder is used as the original additive of the reinforcing phase for in-situ reaction with a particle size of 50 nm and an addition amount of 0.05 wt.%, and Fe powder is used as the β-stabilizing element additive with a particle size of 50-150 μm and an addition amount of 3 wt.%.

[0052] (2) Preparation of mixed powder: rotation speed 200 r / min, ball milling time 5 h, ball to powder ratio 3:1; (3) AM parameters: printing power 1000 W, powder feeding rate 4%, scanning speed 500 mm / min, and layer thickness 0.52 mm.

[0053] (4) Laser molten deposition forming: The mixed powder is delivered to the molten pool on the surface of the substrate by a powder delivery airflow. Under the action of the laser, the mixed powder is melted and deposited on the surface of the substrate. The passes are staggered and overlapped to form a layer. After printing one layer, the laser head moves up 0.37 mm to print the next layer. The number of printed layers is greater than 100. Ultra-high strength and heat-resistant titanium-based composite materials are obtained by layer-by-layer deposition.

[0054] Figure 3 This is a SEM image of the microstructure of the ultra-high strength titanium-based composite material prepared in Example 4. It can be seen that the TiB obtained by the in-situ reaction is dispersed, the size of the α phase is reduced, and it presents a short rod-like morphology.

[0055] The ultra-high-strength titanium-based composite material prepared in Example 4 has a tensile strength of up to 1450 MPa. The broken Fe as a β-eutectic stabilizing element changes the matrix phase microstructure by 8%, the high-temperature tensile strength at 400°C is 1120 MPa, and the high-temperature tensile strength at 500°C is 940 MPa.

[0056] In Example 4, the Fe element can significantly reduce the β→α phase transition temperature, expand the β phase region, and increase the volume fraction of the β phase; it can inhibit the growth of α phase grains and promote the equiaxed and refined α phase; at the same time, it is dissolved in the β phase to cause lattice distortion, hinder dislocation movement, and contribute to strength.

[0057] Compared with Example 4, Examples 1-3, based on the heterogeneous structure of the reinforcement phase, both types of β-stabilizing elements can significantly change the matrix phase characteristics, greatly improving the room temperature tensile strength and high temperature strength of the matrix alloy TC4. The effect of the present invention is remarkable.

[0058] Comparative Example 1: The difference between this example and Example 1 is that the amount of Mo added is 0. When no β-stabilizing element is added, the strength of the composite material is 1280 MPa, which is significantly lower than the strength of the composite material obtained in Examples 1-3.

[0059] Comparative Example 2: The difference between this example and Example 1 is that B 4 When the addition amount of C is 0, when no in-situ self-generated reinforcement phase and reinforcement phase network structure are constructed, the strength of the alloy is 1105 MPa, which is significantly lower than the strength of Example 1.

[0060] As described above, by designing the ratio of matrix alloy, ceramic phase and β-stabilizing element, the microstructure of reinforcement phase and matrix phase can be adjusted and controlled, and the non-uniform structural strengthening of reinforcement phase, β-phase stabilization and solid solution strengthening are synergistically achieved, thus breaking through the upper limit of tensile strength of titanium-based composite materials. The described embodiments do not impose any formal limitations on the present invention. For example, titanium-based composite materials with non-uniform structure of reinforcement phase and non-uniform size structure of matrix phase obtained by synergistic regulation of β-stabilizing elements and ceramic reinforcement phase based on additive manufacturing technology belong to the protection scope of the present invention. Therefore, any technician familiar with this profession, without departing from the scope of the technical solution of the present invention, according to the technical essence of the present invention, any simple modification, equivalent replacement and improvement of the above embodiments, etc., are within the protection scope of the technical solution of the present invention.

Claims

1. A method for preparing an ultra-high strength and heat-resistant titanium-based composite material, characterized in that: include: The titanium alloy powder, the reinforcing phase raw material and the β-stabilizing element powder are ball-milled and mixed to obtain a mixed powder, wherein the content of the β-stabilizing element in the mixed powder is 0.01 wt.% - 9 wt.%; The titanium-based composite material is obtained by laser melting deposition additive manufacturing, including: sending the mixed powder to the molten pool on the surface of the substrate through the powder feeding airflow, melting and depositing on the surface of the substrate under the action of laser, and obtaining the ultra-high strength and heat-resistant titanium-based composite material by layer-by-layer deposition.

2. The method for preparing the ultra-high strength and heat-resistant titanium-based composite material according to claim 1, characterized in that: The content of the β-stabilizing element in the mixed powder is 2 wt.% - 6 wt.%.

3. The method for preparing the ultra-high strength and heat-resistant titanium-based composite material according to claim 1 or 2, characterized in that: The content of the reinforcing phase raw material in the mixed powder is 0.1 wt.% - 3 wt.%, and the size of the reinforcing phase raw material is 1 μm - 10 μm.

4. The method for preparing the ultra-high strength and heat-resistant titanium-based composite material according to claim 1 or 2, characterized in that: The content of the reinforcing phase raw material in the mixed powder is 0.01 wt.% - 2 wt.%, and the size of the reinforcing phase raw material is 1 nm - 100 nm.

5. The method for preparing the ultra-high strength and heat-resistant titanium-based composite material according to claim 1, characterized in that: The reinforcing phase raw material is one or more of TiB, TiC, TiN, La2O3, TiB2, and Ti5Si3.

6. The method for preparing the ultra-high strength and heat-resistant titanium-based composite material according to claim 1, characterized in that: The β-stabilizing element includes one or more of molybdenum, vanadium, niobium, tantalum, iron, copper, and silicon.

7. The method for preparing the ultra-high strength and heat-resistant titanium-based composite material according to claim 1, characterized in that: The power of the laser melting deposition additive manufacturing is 600 W - 1000 W, the printing rate is 500 mm / min - 1000 mm / min, the overlap rate is 35% - 45%, the layer thickness is 0.3 mm - 0.6 mm, the oxygen content is less than 200 ppm, and the argon atmosphere is protected.

8. The method for preparing the ultra-high strength and heat-resistant titanium-based composite material according to claim 1, characterized in that: The rotation speed of the ball milling mixing is 100 r / min-300 r / min.

9. An ultra-high strength and heat-resistant titanium-based composite material, characterized in that: The ultra-high strength and heat-resistant titanium-based composite material is prepared by the preparation method according to any one of claims 1 to 8.

10. The ultra-high strength and heat-resistant titanium-based composite material according to claim 9, characterized in that: The room temperature tensile strength of the ultra-high strength and heat-resistant titanium-based composite material is greater than 1400 MPa, the high temperature tensile strength at 400°C is greater than 900 MPa, and the high temperature tensile strength at 500°C is greater than 750 MPa.

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