High-strength high-hardness multi-element alloy titanium-based composite material and preparation method thereof

Abstract

The application relates to the field of composite materials and more particularly to a high-strength high-hardness multi-element alloy titanium-based composite material and a preparation method thereof. The preparation method of the high-strength high-hardness multi-element alloy titanium-based composite material comprises the following steps: (S1) configuring raw materials according to the element composition of a matrix in percentage by mass, then adding a reinforcing phase to obtain alloy materials; (S2) obtaining a titanium-based composite material ingot through vacuum suspension melting of the alloy materials; and (S3) obtaining the high-strength high-hardness multi-element alloy titanium-based composite material after hot rolling of the titanium-based composite material ingot in an (alpha+beta) phase region for at least four passes. The preparation method is simple, easy to operate and easy to be applied to industrialization. The titanium-based composite material adopts a multi-element alloy matrix, plays a role in reducing a phase transition point temperature and supplementing strength, and adds La2O3 and TiB and / or TiC to form a reinforcing phase, so that synergistic strengthening is realized with the matrix, and finally the high-strength high-hardness multi-element alloy titanium-based composite material is obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of composite materials, and more particularly to a high-strength and high-hardness multi-element alloy titanium-based composite material and a preparation method thereof. BACKGROUND

[0002] With the continuous pursuit of high precision and high efficiency processing in various industries and the increasing demand for the performance of materials. For example, in the milling process of automobile engine cylinder block, hard alloy cutters, which are high-strength and high-hardness materials, are needed to ensure the machining precision and the service life of the cutter. In the field of mold manufacturing, in order to produce complex shape, high precision, large batch parts, the mold material must have sufficient strength and hardness, such as injection mold for producing high-precision plastic parts, high-strength and high-hardness mold steel is needed. In the field of aerospace, in order to reduce the weight of the aircraft to improve fuel efficiency, while ensuring the strength of the fuselage structure, high-strength and high-hardness carbon fiber composite materials are needed to manufacture wings, fuselages and other components. Especially in the working environment of the aircraft engine, such as the turbine blade under high temperature, high pressure and high speed, high-strength and high-hardness materials are needed to withstand the impact of high-temperature gas and maintain stable working state. In the field of new energy, such as wind power, in order to improve the strength and wind erosion resistance of wind turbine blades, high-strength and high-hardness fiber reinforced composite materials are also needed. In addition, the body and track materials of high-speed trains also need high-strength and high-hardness properties to cope with the huge pressure and friction force when running at high speed.

[0003] Titanium alloy has high strength, low density, high temperature resistance, corrosion resistance and other advantages, so it is widely used in aircraft engines, fuselage structural parts, landing gears and other parts, such as engine compressor blades, discs and other components, which can work stably in high temperature environment and improve engine performance. However, it faces more severe thermal cycles and mechanical environments, and has very high requirements for the strength and hardness of the material. Therefore, it is urgent to develop high-strength and high-hardness titanium-based composite materials with better performance to meet the requirements of strength and hardness of the material in severe environments. SUMMARY

[0004] The present application provides a high-strength and high-hardness multi-element alloy titanium-based composite material and a preparation method thereof to meet the requirements of strength and hardness of the material in severe environments.

[0005] The implementation process of the present application is as follows:

[0006] In a first aspect, a preparation method of a high-strength and high-hardness multi-element alloy titanium-based composite material is provided, comprising the following steps: (S1) configuring raw materials according to the element composition of a matrix in terms of mass percentage, and then adding a reinforcing phase to obtain an alloy material; (S2) obtaining a titanium-based composite material ingot by vacuum suspension melting of the alloy material; and (S3) obtaining the high-strength and high-hardness multi-element alloy titanium-based composite material by hot rolling the titanium-based composite material ingot in an (α+β) phase region for at least four passes.

[0007] Further, the high-strength and high-hardness multi-element alloy titanium-based composite material is subjected to ion nitriding treatment, and the hardness of the titanium-based composite material obtained is further improved.

[0008] Further, in step (S1), the element composition of the matrix in terms of mass percentage is 5-5.5% of Al, 2-2.5% of Nb, 1.5-1.7% of Fe, 1.4-1.45% of Mo, 1.25-1.35% of V, 0.8-1.2% of Zr, and the balance of Ti; and the reinforcing phase comprises La2O3, and further comprises TiB and / or TiC.

[0009] Further, the mass percentage of the reinforcing phase in the titanium-based composite material is 3.02-5.5%.

[0010] Further, in step (S2), the specific process of the vacuum suspension melting comprises the following steps: (S2.1) placing the alloy material in a crucible; (S2.2) vacuumizing the furnace of a vacuum water-cooled copper crucible suspension melting furnace, filling argon, and connecting the power supply; (S2.3) melting at a power of 70-140 kw, and then refining at a power of 130-140 kw; (S2.4) repeating the melting and refining processes by turning over the alloy for at least 5 times, naturally cooling the furnace after the refining is completed, discharging the furnace, and obtaining the titanium-based composite material ingot.

[0011] Further, in step (S3), the opening rolling temperature of each pass of hot rolling is 1200-1250 K, and the final rolling temperature is 1175-1200 K.

[0012] Further, in step (S3), the intermediate annealing treatment at a temperature of 1190-1220 K for 0.5-6 h is performed between the hot rolling passes.

[0013] Further, in step (S1), the elements Ti, Al, Nb, Fe, Mo, V, and Zr in the matrix are added in the form of titanium sponge, high-purity aluminum, niobium titanium alloy, iron particles, titanium molybdenum alloy, vanadium aluminum alloy, and zirconium sponge, respectively; and the TiB, TiC, and La2O3 in the reinforcing phase are added in the form of titanium diboride, graphite powder, and lanthanum oxide, respectively.

[0014] Further, the titanium diboride and the graphite powder are respectively synthesized into TiB and TiC through in-situ autogenic reaction, and the in-situ autogenic reaction is shown in the following formula: Ti+TiB2=2TiB, Ti+C=TiC.

[0015] Further, the vacuum degree in the step (S2.2) is 3.5*10 -2 ~4*10 -2 Pa, and the argon filling pressure is 0.07~0.09MPa.

[0016] Further, in the step (S2.3), the smelting process is smelting under powers of 70~80kw, 90~100kw, 110~120kw and 130~140kw in sequence, and then refining under the power of 130~140kw.

[0017] In a second aspect, the application provides a high-strength and high-hardness multi-element alloy titanium-based composite material prepared by the method of any one of the first aspect, comprising a matrix and a reinforcing phase, the matrix comprising Al 5~5.5%, Nb 2~2.5%, Fe 1.5~1.7%, Mo 1.4~1.45%, V 1.25~1.35%, Zr 0.8~1.2% by mass percentage, and the balance being Ti; the reinforcing phase comprising La2O3, and further comprising TiB and / or TiC, and the mass percentage of the reinforcing phase in the titanium-based composite material being 3.02~5.5%.

[0018] The application has the following positive effects: (1) the preparation method of the high-strength and high-hardness multi-element alloy titanium-based composite material is simple, easy to operate and easy to be applied in industry; (2) the titanium-based composite material adopts a multi-element alloy matrix, which reduces the phase transition point temperature and supplements the strength, and further adds the reinforcing phase composed of La2O3, TiB and / or TiC, which realizes synergistic strengthening with the matrix, wherein the rare earth oxide La2O3 is beneficial to refining the grains of the composite material, improving the fatigue resistance and improving the thermal stability, and finally the high-strength and high-hardness multi-element alloy titanium-based composite material is obtained.

[0019] It should be understood that the general description above and the following detailed description are only exemplary and cannot limit the application. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate one or more embodiments of the application and, together with the description, explain the principles of the application and enable a person skilled in the relevant art to make and use the application.

[0021] Figure 1 The process flow chart of the method of the application is shown in the following figure;

[0022] Figure 2Engineering stress-strain curves for TMC0-60 to TMC6-60;

[0023] Figure 3 Optical microscope images for TMC0-TMC6 as cast;

[0024] Figure 4 SEM images for TMC0-TMC6 as cast;

[0025] Figure 5 Optical microscope images for TMC0-TMC6 after hot rolling;

[0026] Figure 6 SEM images for TMC0-TMC6 after hot rolling;

[0027] Figure 7 Optical microscope images for TMC0-60 to TMC6-60;

[0028] Figure 8 SEM images for TMC0-60 to TMC6-60. DETAILED DESCRIPTION

[0029] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations can, however, be implemented in many different forms and should not be construed as limited to the examples set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and fully convey the inventive aspects of the example implementations to those skilled in the art. The described features, structures, or characteristics can be combined in one or more implementations in any suitable manner. In the following description, numerous specific details are provided to give a thorough understanding of implementations of the application.

[0030] The application provides a preparation method of high-strength and high-hardness multi-element alloy titanium-based composite material, which has the characteristics of simple method, easy operation and easy industrial application. Figure 1 As shown in the figure, the method specifically comprises the following steps:

[0031] (S1) configuring raw materials according to the element composition of the matrix in mass percentage, and then adding a reinforcing phase to obtain an alloy material;

[0032] The element composition of the matrix is 5-5.5% of Al, 2-2.5% of Nb, 1.5-1.7% of Fe, 1.4-1.45% of Mo, 1.25-1.35% of V, 0.8-1.2% of Zr, and the balance of Ti.

[0033] The reinforcing phase comprises La2O3, and further comprises TiB and / or TiC, and the mass percentage of the reinforcing phase in the titanium-based composite material is 3.02-5.5%.

[0034] The elements Ti, Al, Nb, Fe, Mo, V, Zr in the matrix are added in the form of titanium sponge, high-purity aluminum, niobium-titanium alloy, iron particles, titanium-molybdenum alloy, vanadium-aluminum alloy, and zirconium sponge respectively; the TiB, TiC, La2O3 in the reinforcing phase are added in the form of titanium diboride, graphite powder, and lanthanum oxide respectively. The titanium diboride and the graphite powder are respectively synthesized into TiB and TiC through in-situ self-reaction, and the in-situ self-reaction is shown in the following formula: Ti+TiB2=2TiB, Ti+C=TiC.

[0035] (S2) obtaining a titanium-based composite material ingot by vacuum suspension melting of the alloy material;

[0036] The specific process of the vacuum suspension melting includes the following steps:

[0037] (S2.1) placing the alloy material in a crucible;

[0038] (S2.2) vacuumizing the furnace of the vacuum water-cooled copper crucible suspension melting furnace to 3.5*10 -2 ~ 4*10 -2 Pa, filling argon to 0.07~0.09 MPa, and turning on the power supply;

[0039] (S2.3) sequentially melting at 70~80kw, 90~100kw, 110~120kw, and 130~140kw for 4~6 minutes respectively, and then refining at 130~140kw for 4~6 minutes;

[0040] (S2.4) repeating the melting and refining process for at least 5 times by turning over the alloy, until the alloy is uniformly melted, and then naturally cooling the furnace after the refining is completed, discharging, and obtaining a titanium-based composite material ingot.

[0041] (S3) obtaining a high-strength and high-hardness multi-element alloy titanium-based composite material after at least four passes of hot rolling of the titanium-based composite material ingot in the (α+β) phase region.

[0042] In each pass of hot rolling, the opening rolling temperature is 1200~1250K, the final rolling temperature is 1175~1200K, the intermediate annealing treatment at 1190~1220K for 0.5~6h is performed between the hot rolling passes, and the hot rolling deformation amount is 60%~80%.

[0043] The high-strength and high-hardness multi-element alloy titanium-based composite material obtained after hot rolling is further improved in hardness by ion nitriding treatment. The specific process is as follows: the hot-rolled rod of the titanium-based composite material is placed in a glow ion nitriding furnace, the voltage is set to 400-500V, the temperature is set to 400-900℃, the temperature rising rate is set to 20-25℃ / min, then nitrogen is introduced, when the temperature reaches 400-900℃, hydrogen is introduced into the glow ion nitriding furnace (according to the volume ratio of nitrogen to hydrogen of 1:3), until the pressure is 200-250Pa, ion nitriding is carried out for 5-20 hours, and then the titanium-based composite material after ion nitriding treatment is obtained after cooling.

[0044] The application also provides a high-strength and high-hardness multi-element alloy titanium-based composite material prepared by the above method, which comprises a base and a reinforcing phase, and the element composition of the base is as follows: Al 5-5.5%, Nb 2-2.5%, Fe 1.5-1.7%, Mo 1.4-1.45%, V 1.25-1.35%, Zr 0.8-1.2%, and the balance is Ti.

[0045] The reinforcing phase comprises La2O3, and further comprises TiB and / or TiC, and the mass percentage of the reinforcing phase in the titanium-based composite material is 3.02-5.5%.

[0046] The titanium-based composite material uses a multi-element alloy base, which plays a role in reducing the phase transition temperature and supplementing strength, and adds La2O3 and TiB and / or TiC to form a reinforcing phase, which realizes synergistic strengthening with the base, wherein the rare earth oxide La2O3 is beneficial to refining the grains of the composite material, improving the fatigue resistance and improving the thermal stability, and finally a high-strength and high-hardness multi-element alloy titanium-based composite material is obtained.

[0047] The muffle furnace in the application adopts a ZY-1200 muffle furnace, and in addition to the ZY-1200 muffle furnace, other muffle furnaces of other manufacturers can also be used, as long as they can achieve the effect of heating and heat preservation. The hot rolling machine can use any hot rolling machine of any manufacturer, as long as it can carry out the hot rolling process described in the application. In the melting and hot rolling process of the base alloy and the titanium-based composite material in the application, the α+β~β phase transition temperature plays an important reference role. In addition, the presence of elements such as aluminum, vanadium, zirconium, iron and the like in the titanium-based composite material will affect its α+β~β phase transition temperature, and impurity elements such as carbon, hydrogen, oxygen and nitrogen will also affect its phase transition temperature. In order to provide a scientific basis for subsequent experimental research, the α+β~β phase transition temperature of the base alloy TMC0 of Comparative Example 1 is measured by differential scanning calorimetry (DSC) to be 950℃, and the α+β~β phase transition temperature of the titanium-based composite material of Example 1 is measured by continuous heating metallography to be 1000-1025℃.

[0048] The specifications of the raw materials involved in the application are shown in Table 1.

[0049] Table 1 Specifications of raw materials for experiment

[0050]

[0051]

[0052] The density of TiB is 4.50 g / cm3 3 The density of TiC is 4.99 g / cm3 3 The density of La2O3 is 6.51 g / cm3 3 The relative atomic mass of each element required for calculation is: B: 10.81, C: 12.01, Ti: 47.87, O: 16.00, La: 138.91.

[0053] Comparative Example 1 Base Alloy TMC0

[0054] The base alloy comprises the following mass percentage of elemental components: Al 5.3%, Nb 2.3%, Fe 1.6%, Mo 1.43%, V 1.3%, Zr 0.8%, and the balance being Ti.

[0055] The method for preparing the base comprises the following steps:

[0056] (S1) According to the mass percentage of elemental components of the base alloy, raw materials of titanium sponge 821.91 g, high-purity aluminum 44.33 g, niobium-titanium alloy (Ti-53Nb) 43.40 g, iron particles 16 g, vanadium-aluminum alloy (Al-60V) 21.67 g, titanium-molybdenum alloy (Ti-32Mo) 44.69 g, and zirconium sponge 8 g are added to obtain base alloy material.

[0057] (S2) The base alloy material is subjected to vacuum arc melting to obtain a base alloy ingot;

[0058] The parameters of the process of vacuum arc melting are as follows:

[0059] (S2.1) The base alloy material is placed in a crucible;

[0060] (S2.2) The base alloy material is subjected to first vacuum arc melting, the vacuum degree in the furnace of the vacuum arc melting furnace is extracted to <9 Pa, the melting current ranges from 700 A to 2300 A, the steady arc current ranges from 2 A to 5 A, the steady arc voltage ranges from 12 V to 35 V, and the melting time is 5 minutes;

[0061] (S2.3) Turn over the alloy, second vacuum arc melting, the vacuum degree in the furnace of the vacuum arc melting furnace is extracted to <9 Pa, the melting current ranges from 600 A to 4300 A, the steady arc current ranges from 2 A to 5 A, the steady arc voltage ranges from 12 V to 35 V, the melting time is 5 minutes, the furnace is naturally cooled after the melting is completed, the gas is discharged, and the base alloy ingot is obtained.

[0062] (S3) First, a cylindrical casting is cut on the base alloy ingot by wire cutting; then Ti-1200 high-temperature oxidation-resistant paint is evenly applied on the surface of the casting to reduce high-temperature oxidation, and after drying, the casting is placed into a hot rolling mill for six passes of hot rolling, the opening rolling temperature of each pass of hot rolling is 1250 K, the final rolling temperature is 1200 K, the intermediate annealing treatment at 1220 K for 1 h is carried out between the hot rolling passes, and the hot rolling deformation is 80%, so that the hot-rolled rod of the base alloy is obtained, which is numbered as TMC0. The density of the base alloy TMC0 needs to be tested by the Archimedes drainage method, and finally the density of the base alloy is measured to be 4.61 g / cm 3 .

[0063] Example 1 High-strength High-hardness Multi-element Alloy Titanium Matrix Composite TMC1

[0064] The high-strength and high-hardness multi-element alloy titanium-based composite material described in this embodiment comprises a base alloy and a reinforcing phase, and the base alloy comprises the following elements in mass percentage: Al 5.3%, Nb 2.3%, Fe 1.6%, Mo 1.43%, V 1.3%, Zr 0.8%, and the balance is Ti.

[0065] The reinforcing phase is TiB and La2O3, the mass percentage of the reinforcing phase TiB in the titanium-based composite material is 2.74%, and the mass percentage of La2O3 is 0.285%.

[0066] The preparation method of the high-strength and high-hardness multi-element alloy titanium-based composite material described in this embodiment comprises the following steps:

[0067] (S1) According to the mass percentage of the elements of the base alloy, the raw materials titanium sponge 808.23 g, high-purity aluminum 43 g, niobium titanium alloy (Ti-53Nb) 42.08 g, iron particles 15.52 g, vanadium aluminum alloy (Al-60V) 21.01 g, titanium molybdenum alloy (Ti-32Mo) 43.34 g, and sponge zirconium 7.76 g are added, and then the reinforcing phase titanium diboride 16.20 g and lanthanum oxide 2.86 g are added to obtain an alloy material; the titanium diboride is synthesized by in-situ self-reaction, and the in-situ self-reaction is as shown in the following formula: Ti + TiB2 = 2TiB.

[0068] (S2) The alloy material is melted by vacuum suspension melting to obtain a titanium-based composite material ingot;

[0069] The specific process of the vacuum suspension melting includes the following steps:

[0070] (S2.1) placing the alloy material in the crucible;

[0071] (S2.2) vacuumizing the furnace of the vacuum water-cooled copper crucible suspension melting furnace to 3.5*10 -2 Pa, 0.07 MPa of argon, and power on;

[0072] (S2.3) sequentially melting at 70 kw, 90 kw, 110 kw, and 130 kw for 5 minutes respectively, and then refining at 130 kw for 5 minutes;

[0073] (S2.4) repeating the melting and refining process for 5 times by turning over the alloy, until the alloy is uniformly melted, and after the refining is completed, the furnace is naturally cooled, degassed, and discharged to obtain a titanium-based composite material ingot.

[0074] (S3) first cutting a cylindrical casting on the titanium-based composite material ingot by using a wire cutting; then evenly applying Ti-1200 high-temperature oxidation-resistant paint on the surface of the casting to reduce high-temperature oxidation, and after drying, placing the casting into a hot rolling mill for six passes of hot rolling, the opening rolling temperature of each pass of hot rolling is 1250 K, and the final rolling temperature is 1200 K, the intermediate annealing treatment is performed at 1220 K for 1 h between the hot rolling passes, and the hot rolling deformation amount is 80%, to obtain a hot-rolled rod of the high-strength and high-hardness multi-element alloy titanium-based composite material, numbered as TMC1.

[0075] Example 2 High-strength High-hardness Multi-element Alloy Titanium Matrix Composite TMC2

[0076] The high-strength and high-hardness multi-element alloy titanium-based composite material described in the embodiment includes a base and a reinforcing phase, and the base alloy includes the following mass percentages of element components: Al 5.3%, Nb 2.3%, Fe 1.6%, Mo 1.43%, V 1.3%, Zr 0.8%, and the balance of Ti.

[0077] The reinforcing phase is TiC and La2O3, the mass percentage of TiC in the titanium-based composite material is 2.75%, and the mass percentage of La2O3 is 0.285%.

[0078] The preparation method of the high-strength and high-hardness multi-element alloy titanium-based composite material described in the embodiment includes the following steps:

[0079] (S1)adding raw materials titanium sponge 818.94g, high-purity aluminum 43g, niobium titanium alloy (Ti-53Nb) 42.08g, iron particles 15.51g, vanadium aluminum alloy (Al-60V) 21g, titanium molybdenum alloy (Ti-32Mo) 43.33g, zirconium sponge 7.76g, then adding reinforcing phase graphite powder 5.53g and lanthanum oxide 2.85g to obtain alloy material; the graphite powder is synthesized by in-situ autogenic reaction as follows: Ti+C=TiC.

[0080] (S2)obtaining titanium-based composite material ingot by vacuum suspension melting of the alloy material;

[0081] The specific process of the vacuum suspension melting includes the following steps:

[0082] (S2.1)placing the alloy material in the crucible;

[0083] (S2.2)vacuumizing the furnace of the vacuum water-cooled copper crucible suspension melting furnace to 3.5×10 -2 Pa, filling argon 0.07MPa, and turning on the power;

[0084] (S2.3)melting for 5 minutes at 70kw, 90kw, 110kw, 130kw in turn, and then refining for 5 minutes at 130kw;

[0085] (S2.4)repeating the melting and refining process for 5 times by turning over the alloy, until the alloy is uniformly melted, and then naturally cooling in the furnace after refining, discharging and taking out the furnace to obtain the titanium-based composite material ingot.

[0086] (S3)first cutting out a cylindrical casting on the titanium-based composite material ingot by using wire cutting; then evenly applying Ti-1200 high-temperature oxidation-resistant paint on the surface of the casting to reduce high-temperature oxidation, and after drying, putting the casting into a hot rolling mill for six passes of hot rolling, the opening rolling temperature of each pass of hot rolling is 1250K, and the final rolling temperature is 1200K, and the intermediate annealing treatment is carried out at 1220K for 1h between the hot rolling passes, and the hot rolling deformation is 80%, to obtain a hot-rolled rod of high-strength high-hardness multi-element alloy titanium-based composite material, numbered as TMC2.

[0087] Example 3 High-strength High-hardness Multi-element Alloy Titanium Matrix Composite TMC3

[0088] The high-strength high-hardness multi-element alloy titanium-based composite material described in the embodiment includes a matrix and a reinforcing phase, and the matrix alloy includes the following mass percentages of elemental components: Al 5.3%, Nb 2.3%, Fe 1.6%, Mo 1.43%, V 1.3%, Zr 0.8%, and the balance is Ti.

[0089] The reinforcing phase is TiB, TiC and La2O3, the mass percentage of the reinforcing phase TiB in the titanium-based composite material is 1.33%, the mass percentage of TiC is 1.47%, and the mass percentage of La2O3 is 0.285%.

[0090] The preparation method of the high-strength and high-hardness multi-element alloy titanium-based composite material comprises the following steps:

[0091] (S1) According to the elemental composition of the matrix, the raw materials are added as follows: titanium sponge 813.75 g, high-purity aluminum 42.96 g, niobium-titanium alloy (Ti-53Nb) 42.06 g, iron particles 15.5 g, vanadium-aluminum alloy (Al-60V) 21 g, titanium-molybdenum alloy (Ti-32Mo) 43.31 g, zirconium sponge 7.75 g, then titanium diboride 7.86 g, graphite powder 2.95 g and lanthanum oxide 2.86 g are added to obtain an alloy material; the titanium diboride and the graphite powder are synthesized by in-situ self-reaction to obtain TiB and TiC, respectively, and the in-situ self-reaction is as follows: Ti+TiB2=2TiB, Ti+C=TiC.

[0092] (S2) The alloy material is subjected to vacuum suspension melting to obtain a titanium-based composite material ingot;

[0093] The specific process of the vacuum suspension melting comprises the following steps:

[0094] (S2.1) The alloy material is placed in a crucible;

[0095] (S2.2) The vacuum in the furnace of the vacuum water-cooled copper crucible suspension melting furnace is drawn to 3.5×10 -2 Pa, argon is filled to 0.07 MPa, and the power is turned on;

[0096] (S2.3) The alloy is sequentially melted at 70 kw, 90 kw, 110 kw and 130 kw for 5 minutes respectively, and then refined at 130 kw for 5 minutes;

[0097] (S2.4) The alloy is repeatedly melted and refined for 5 times, until the alloy is uniformly melted, and then the furnace is naturally cooled after the refining is completed, the gas is discharged, and the titanium-based composite material ingot is obtained.

[0098] (S3) A cylindrical casting is first cut on the titanium-based composite material ingot by using wire cutting; then Ti-1200 high-temperature antioxidant paint is evenly applied on the surface of the casting to reduce high-temperature oxidation, and after drying, the casting is placed into a hot rolling mill for six passes of hot rolling, the opening rolling temperature of each pass of hot rolling is 1250 K, and the final rolling temperature is 1200 K; the intermediate annealing treatment is carried out at 1220 K for 1 h between the hot rolling passes, and the hot rolling deformation is 80%, to obtain a hot-rolled rod of the high-strength and high-hardness multi-element alloy titanium-based composite material, which is numbered as TMC3.

[0099] Example 4 High-strength High-hardness Multi-element Alloy Titanium Matrix Composite TMC4

[0100] The high-strength and high-hardness multi-element alloy titanium-based composite material comprises a base and a reinforcing phase, and the base alloy comprises the following elements in mass percentage: Al 5.3%, Nb 2.3%, Fe 1.6%, Mo 1.43%, V 1.3%, Zr 0.8%, and the balance being Ti.

[0101] The reinforcing phase is TiB and La2O3, and the mass percentage of the reinforcing phase TiB in the titanium-based composite material is 4.94%, and the mass percentage of La2O3 is 0.285%.

[0102] The preparation method of the high-strength and high-hardness multi-element alloy titanium-based composite material comprises the following steps:

[0103] (S1) According to the mass percentage of the element composition of the base, raw materials titanium sponge 799.1 g, high-purity aluminum 42.02 g, niobium titanium alloy (Ti-53Nb) 41.13 g, iron particles 15.16 g, vanadium aluminum alloy (Al-60V) 20.53 g, titanium molybdenum alloy (Ti-32Mo) 42.35 g, and zirconium sponge 7.58 g are added, and then the reinforcing phase titanium diboride 29.27 g and lanthanum oxide 2.86 g are added to obtain an alloy material; the titanium diboride is synthesized by in-situ self-reaction as follows: Ti+TiB2=2TiB.

[0104] (S2) The alloy material is subjected to vacuum suspension melting to obtain a titanium-based composite material ingot;

[0105] The specific process of the vacuum suspension melting comprises the following steps:

[0106] (S2.1) The alloy material is placed in a crucible;

[0107] (S2.2) The vacuum in the furnace of the vacuum water-cooled copper crucible suspension melting furnace is drawn to 3.5×10 -2 Pa, argon is filled to 0.07 MPa, and the power is turned on;

[0108] (S2.3) Melting is carried out at 70 kw, 90 kw, 110 kw, and 130 kw, respectively, for 5 minutes each, and then refining is carried out at 130 kw for 5 minutes;

[0109] (S2.4) The alloy is turned over to repeat the melting and refining process for 5 times, until the alloy is uniformly melted, and after the refining is completed, the furnace is naturally cooled, the gas is discharged, and the titanium-based composite material ingot is obtained.

[0110] (S3) Firstly, a cylindrical casting is cut on a titanium-based composite casting ingot by wire cutting; then Ti-1200 high-temperature oxidation-resistant paint is evenly applied on the surface of the casting to reduce high-temperature oxidation, and after drying, the casting is placed into a hot rolling mill for six passes of hot rolling, the opening rolling temperature of each pass of hot rolling is 1250K, the final rolling temperature is 1200K, the intermediate annealing treatment is carried out at 1220K for 1h between the hot rolling passes, and the hot rolling deformation is 80%, thereby obtaining a hot-rolled rod of high-strength high-hardness multi-element alloy titanium-based composite material, numbered as TMC4.

[0111] Example 5 High-strength High-hardness Multi-element Alloy Titanium Matrix Composite TMC5

[0112] The high-strength high-hardness multi-element alloy titanium-based composite material described in the embodiment comprises a base and a reinforcing phase, and the base alloy comprises the following elements in mass percentage: Al 5.3%, Nb 2.3%, Fe 1.6%, Mo 1.43%, V 1.3%, Zr 0.8%, and the balance being Ti.

[0113] The reinforcing phase is TiC and La2O3, the mass percentage of the reinforcing phase TiC in the titanium-based composite material is 5.45%, and the mass percentage of La2O3 is 0.285%.

[0114] The preparation method of the high-strength high-hardness multi-element alloy titanium-based composite material described in the embodiment comprises the following steps:

[0115] (S1) According to the mass percentage of the element composition of the base, raw materials of titanium sponge 818.35g, high-purity aluminum 41.79g, niobium titanium alloy (Ti-53Nb) 40.91g, iron particles 15.08g, vanadium aluminum alloy (Al-60V) 20.42g, titanium molybdenum alloy (Ti-32Mo) 42.12g, zirconium sponge 7.54g, then graphite powder 10.94g and lanthanum oxide 2.85g are added to obtain alloy material; the graphite powder is synthesized by in-situ autogenic reaction, and the in-situ autogenic reaction is as shown in the following formula: Ti+C=TiC.

[0116] (S2) The alloy material is obtained by vacuum suspension melting to obtain a titanium-based composite casting ingot;

[0117] The specific process of the vacuum suspension melting comprises the following steps:

[0118] (S2.1) The alloy material is placed in the crucible;

[0119] (S2.2) The vacuum in the furnace of the vacuum water-cooled copper crucible suspension melting furnace is drawn to 3.5×10 -2 Pa, the argon is filled to 0.07MPa, and the power is turned on;

[0120] (S2.3) sequentially smelt for 5 minutes at 70kw, 90kw, 110kw, 130kw power respectively, and then refine for 5 minutes at 130kw power;

[0121] (S2.4) repeat the smelting and refining process for 5 times by turning over the alloy, until the alloy is smelted uniformly, and then the alloy is naturally cooled in the furnace, degassed and discharged, to obtain a titanium-based composite material ingot.

[0122] (S3) first cut a cylindrical casting on the titanium-based composite material ingot by wire cutting; then evenly apply Ti-1200 high-temperature oxidation-resistant paint on the surface of the casting to reduce high-temperature oxidation, and after drying, put the casting into a hot rolling mill for six passes of hot rolling, with the opening rolling temperature of each pass being 1250K and the final rolling temperature being 1200K, and the intermediate annealing treatment at 1220K for 1h between hot rolling passes, and the hot rolling deformation being 80%, to obtain a hot-rolled rod of high-strength high-hardness multi-element alloy titanium-based composite material, numbered as TMC5.

[0123] Example 6 High-strength High-hardness Multi-element Alloy Titanium Matrix Composite TMC6

[0124] The high-strength high-hardness multi-element alloy titanium-based composite material described in the embodiment comprises a base and a reinforcing phase, and the base alloy comprises the following elements in mass percentage: Al 5.3%, Nb 2.3%, Fe 1.6%, Mo 1.43%, V 1.3%, Zr 0.8%, and the balance being Ti.

[0125] The reinforcing phase is TiB, TiC and La2O3, and the mass percentage of the reinforcing phase TiB in the titanium-based composite material is 2.47%, the mass percentage of the reinforcing phase TiC is 2.73%, and the mass percentage of La2O3 is 0.285%.

[0126] The preparation method of the high-strength high-hardness multi-element alloy titanium-based composite material described in the embodiment comprises the following steps:

[0127] (S1) according to the mass percentage of the element composition of the base, add raw materials titanium sponge 804.35g, high-purity aluminum 43g, niobium titanium alloy (Ti-53Nb) 42.09g, iron particles 15.52g, vanadium aluminum alloy (Al-60V) 21.01g, titanium molybdenum alloy (Ti-32Mo) 43.34g, and sponge zirconium 7.76g, and then add reinforcing phase titanium diboride 14.60g, graphite powder 5.48g and lanthanum oxide 2.85g, to obtain an alloy material; the titanium diboride and the graphite powder are synthesized into TiB and TiC respectively by in-situ autogenic reaction, and the in-situ autogenic reaction is as shown in the following formula: Ti+TiB2=2TiB, Ti+C=TiC.

[0128] (S2) obtain a titanium-based composite material ingot by vacuum suspension smelting the alloy material;

[0129] The specific process of the vacuum suspension melting includes the following steps:

[0130] (S2.1) Put the alloy into the crucible;

[0131] (S2.2) The vacuum in the vacuum water-cooled copper crucible suspension melting furnace is drawn to 3.5*10 -2 Pa, the argon is filled to 0.07 MPa, and the power is turned on;

[0132] (S2.3) The alloy is repeatedly melted and refined for 5 times under the power of 70kw, 90kw, 110kw, and 130kw, respectively, and then refined for 5 minutes under the power of 130kw;

[0133] (S2.4) The alloy is repeatedly melted and refined for 5 times until the alloy is uniformly melted, and then the furnace is naturally cooled after the refining is completed, the gas is discharged, and the titanium-based composite material ingot is obtained.

[0134] (S3) First, a cylindrical casting is cut on the titanium-based composite material ingot by using a wire cutting; then Ti-1200 high-temperature oxidation-resistant paint is evenly applied on the surface of the casting to reduce high-temperature oxidation, and after drying, the casting is placed into a hot rolling mill for six passes of hot rolling, the opening rolling temperature of each pass of hot rolling is 1250K, and the final rolling temperature is 1200K, the intermediate annealing treatment is carried out at 1220K for 1h between the hot rolling passes, and the hot rolling deformation amount is 80%, thereby obtaining a hot-rolled rod of high-strength high-hardness multi-element alloy titanium-based composite material, which is numbered as TMC6.

[0135] Example 7 High-strength High-hardness Multi-element Alloy Titanium Matrix Composite TMC7

[0136] The high-strength high-hardness multi-element alloy titanium-based composite material described in the embodiment includes a matrix and a reinforcing phase, and the matrix alloy includes the following mass percentage of elemental components: Al 5%, Nb 2%, Fe 1.5%, Mo 1.4%, V 1.25%, Zr 0.8%, and the balance is Ti.

[0137] The reinforcing phase is TiB and La2O3, the mass percentage of the reinforcing phase TiB in the titanium-based composite material is 2.7%, and the mass percentage of La2O3 is 0.32%.

[0138] The preparation method of the high-strength high-hardness multi-element alloy titanium-based composite material described in the embodiment includes the following steps:

[0139] (S1)adding raw materials sponge titanium 818.88g, high-purity aluminum 40.41g, niobium-titanium alloy (Ti-53Nb) 36.6g, iron particles 14.56g, vanadium-aluminum alloy (Al-60V) 20.2g, titanium-molybdenum alloy (Ti-32Mo) 42.43g, and sponge zirconium 7.76g according to the elemental composition of the substrate, and then adding reinforcing phase titanium diboride 15.96g and lanthanum oxide 3.2g to obtain alloy material; the titanium diboride is synthesized by in-situ self-reaction, and the in-situ self-reaction is as shown in the following formula: Ti + TiB2 = 2TiB.

[0140] (S2)obtaining a titanium-based composite material ingot by vacuum suspension melting of the alloy material;

[0141] The specific process of the vacuum suspension melting includes the following steps:

[0142] (S2.1)placing the alloy material in the crucible;

[0143] (S2.2)vacuumizing the furnace of the vacuum water-cooled copper crucible suspension melting furnace to 3.5x10 -2 Pa, charging argon 0.07MPa, and turning on the power;

[0144] (S2.3)melting for 4 minutes at 75kw, 95kw, 115kw, and 135kw in turn, and then refining for 4 minutes at 135kw;

[0145] (S2.4)repeating the melting and refining process for 6 times by turning over the alloy, until the alloy is uniformly melted, and then naturally cooling in the furnace after the refining is completed, discharging, and obtaining a titanium-based composite material ingot.

[0146] (S3)firstly cutting a cylindrical casting on the titanium-based composite material ingot by wire cutting; then evenly applying Ti-1200 high-temperature oxidation-resistant paint on the surface of the casting to reduce high-temperature oxidation, and after drying, placing the casting into a hot rolling mill for six passes of hot rolling, the opening rolling temperature of each pass of hot rolling is 1250K, and the final rolling temperature is 1175K, and the intermediate annealing treatment at 1200K for 0.5h is carried out between the hot rolling passes, and the hot rolling deformation is 80%, and a high-strength high-hardness multi-element alloy titanium-based composite material hot-rolled rod is obtained, which is numbered as TMC7.

[0147] Example 8 High-strength High-hardness Multi-element Alloy Titanium Matrix Composite TMC8

[0148] The high-strength high-hardness multi-element alloy titanium-based composite material described in the embodiment includes a substrate and a reinforcing phase, and the substrate alloy includes the following elemental components in mass percentage: Al 5.5%, Nb 2.5%, Fe 1.7%, Mo 1.45%, V 1.35%, Zr 1.2%, and the balance is Ti.

[0149] The reinforcing phase is TiB and La2O3, the mass percentage of the reinforcing phase TiB in the titanium-based composite material is 5.0%, and the mass percentage of La2O3 is 0.5%.

[0150] The preparation method of the high-strength and high-hardness multi-element alloy titanium-based composite material described in the embodiment comprises the following steps:

[0151] (S1) According to the elemental composition of the matrix, raw materials of titanium sponge 785.91 g, high-purity aluminum 43.471 g, niobium-titanium alloy (Ti-53Nb) 44.58 g, iron particles 16.07 g, vanadium-aluminum alloy (Al-60V) 21.26 g, titanium-molybdenum alloy (Ti-32Mo) 42.82 g, and zirconium sponge 11.34 g are added, and then the reinforcing phase titanium diboride 29.55 g and lanthanum oxide 5 g are added to obtain an alloy material; the titanium diboride is synthesized by in-situ self-reaction, and the in-situ self-reaction is as shown in the following formula: Ti + TiB2 = 2TiB.

[0152] (S2) The alloy material is subjected to vacuum suspension melting to obtain a titanium-based composite material ingot;

[0153] The specific process of the vacuum suspension melting comprises the following steps:

[0154] (S2.1) The alloy material is placed in a crucible;

[0155] (S2.2) The vacuum in the furnace of the vacuum water-cooled copper crucible suspension melting furnace is drawn to 4×10 -2 Pa, argon is filled to 0.09 MPa, and the power is turned on;

[0156] (S2.3) The alloy is sequentially melted at powers of 80 kw, 100 kw, 120 kw, and 140 kw for 6 minutes respectively, and then refined at a power of 140 kw for 6 minutes;

[0157] (S2.4) The alloy is repeatedly melted and refined for 7 times, until the alloy is uniformly melted, and after the refining is completed, the furnace is naturally cooled, the gas is discharged, and the titanium-based composite material ingot is obtained.

[0158] (S3) A cylindrical casting is first cut on the titanium-based composite material ingot by using wire cutting; then Ti-1200 high-temperature antioxidant paint is evenly applied on the surface of the casting to reduce high-temperature oxidation, and after drying, the casting is placed into a hot rolling mill for five passes of hot rolling, the opening rolling temperature of each pass of hot rolling is 1200 K, and the final rolling temperature is 1175 K; the intermediate annealing treatment is carried out at a temperature of 1190 K for 6 h between the hot rolling passes, and the hot rolling deformation amount is 70%, to obtain a hot-rolled rod of the high-strength and high-hardness multi-element alloy titanium-based composite material, which is numbered as TMC8.

[0159] Example 9 Hot-rolled deformation of TMC0-TMC6 changed from 80% to 60%

[0160] The steps and process parameters of the present example are the same as those of Comparative Example 1 and Examples 1-6, except that the number of passes in the hot rolling process of Comparative Example 1 and Examples 1-6 is four, and the deformation amount in the hot rolling is changed to 60%, and the titanium-based composite hot-rolled rods obtained are numbered TMC0-60, TMC1-60, TMC2-60, TMC3-60, TMC4-60, TMC5-60, and TMC6-60, respectively. The effect of deformation amount on the properties of the titanium-based composite is investigated.

[0161] Example 10 Hot-rolled rods of TMC0-TMC6 treated by ion nitriding

[0162] The hot-rolled rods of TMC0-TMC6 were placed in a glow discharge ion nitriding furnace, and the voltage was set to 450 V, the temperature was set to 520°C, and the temperature was raised at a rate of 25°C / min, then nitrogen was introduced, when the temperature reached 520°C, hydrogen was introduced into the glow discharge ion nitriding furnace (according to the volume ratio of nitrogen to hydrogen of 1:3), until the pressure was 250 Pa, ion nitriding was carried out for 18 hours, and after cooling, the TMC0-TMC6 ion nitriding treated rods were obtained.

[0163] Example 11 Hot-rolled rods of TMC7 titanium matrix composite treated by ion nitriding

[0164] The hot-rolled rod of the TMC7 titanium-based composite material was placed in a glow discharge ion nitriding furnace, the voltage was set to 400 V, the temperature was set to 900°C, and the temperature was raised at a rate of 20°C / min, then nitrogen was introduced, when the temperature reached 900°C, hydrogen was introduced into the glow discharge ion nitriding furnace (according to the volume ratio of nitrogen to hydrogen of 1:3), until the pressure was 200 Pa, ion nitriding was carried out for 5 hours, and after cooling, the ion nitriding treated titanium-based composite material was obtained.

[0165] Example 12 Hot-rolled rods of TMC8 titanium matrix composite treated by ion nitriding

[0166] The hot-rolled rod of the TMC8 titanium-based composite material was placed in a glow discharge ion nitriding furnace, the voltage was set to 500 V, the temperature was set to 400°C, and the temperature was raised at a rate of 25°C / min, then nitrogen was introduced, when the temperature reached 400°C, hydrogen was introduced into the glow discharge ion nitriding furnace (according to the volume ratio of nitrogen to hydrogen of 1:3), until the pressure was 250 Pa, ion nitriding was carried out for 20 hours, and after cooling, the ion nitriding treated titanium-based composite material was obtained.

[0167] Performance Test

[0168] (1) Mechanical properties

[0169] From Figure 2From the data of Table 2, Table 3 and Table 4, the comprehensive mechanical properties of the titanium-based composite after hot rolling are improved compared with the as-cast, especially the hardness is greatly improved, and the strength is also significantly improved. In addition, when the deformation is 60%, the tensile strength of TMC3-60 is higher, which shows that reducing the hot rolling deformation will be beneficial to the improvement of the tensile strength. When the deformation is 80%, the hardness of TMC4 is higher.

[0170] Table 2 Comparison of mechanical properties of TMC0-TMC6 as-cast

[0171]

[0172] Table 3 Hot rolling deformation of titanium-based composite

[0173]

[0174]

[0175] Table 4 Mechanical properties of titanium-based composite with 60% hot rolling deformation

[0176]

[0177] (2) Microstructure characteristics

[0178] Figure 3 The optical micrographs of TMC0-TMC6 as-cast are shown in the figure, from which it can be seen that the microstructures of TMC0, TMC2, TMC4 and TMC5 are widmanstatten structure, and the microstructures of TMC1, TMC3 and TMC6 are basketweave structure. Therefore, the hardness of TMC2, TMC4 and TMC5 is stronger.

[0179] Figure 4 The SEM images of TMC0-TMC6 as-cast are shown in the figure, from which it can be seen that the distribution of the reinforcing phase in the alloy matrix is not uniform, and there are long rod-shaped, granular and block-shaped reinforcing phases. The reinforcing phase has different sizes, and the length of the large-size reinforcing phase can reach dozens of μm.

[0180] Figure 5 The optical micrographs of TMC0-TMC6 after hot rolling are shown in the figure, from which it can be seen that after hot rolling, TMC2 and TMC3 are equiaxed structure, TMC0, TMC1 and TMC4 are bimodal structure, TMC5 is widmanstatten structure, and TMC6 is basketweave structure. Increasing the content of the reinforcing phase can improve the hardness, and the type of the reinforcing phase has little effect on the hardness and the tensile strength.

[0181] Figure 6 The SEM images of TMC0-TMC6 after hot rolling are shown in the figure, from which it can be seen that compared with the as-cast, the size of the reinforcing phase of the titanium-based composite after hot rolling is reduced. Compared with other composites, the size of the reinforcing phase of TMC3 is smaller.

[0182] Figure 7 The optical microscope images of TMC0-60 to TMC6-60 show that TMC0-60 is Widmannatstuktur, TMC1-60 is bimodal structure, and TMC2-60 to TMC6-60 is basketweave structure when the hot rolling deformation is 60%. The structure after 60% deformation is quite different from that of the material after 80% hot rolling deformation. Taking TMC3-60 as an example, the equiaxed structure corresponding to 80% deformation is transformed into the basketweave structure corresponding to 60% deformation, which is mainly due to the fact that greater deformation is conducive to promoting recrystallization, thus resulting in higher tensile strength corresponding to small deformation.

[0183] Figure 8 The SEM images of TMC0-60 to TMC6-60 show that the distribution of the reinforcing phase in the matrix is uneven, and the size is not uniform, and the main morphologies are long rods, short rods, near-spherical shapes, polygonal shapes, etc. Compared with the as-cast state, the size of the reinforcing phase is reduced to a certain extent. Compared with the titanium-based composite material with 80% deformation, the titanium-based composite material with 60% deformation corresponds to finer reinforcing phase, indicating that increasing the deformation can efficiently break the reinforcing phase.

[0184] (3) Properties of TMC0-TMC6 before and after ion nitriding treatment

[0185] As can be seen from Table 5, after hot rolling, the hardness of TMC0-TMC6 after ion nitriding treatment is obviously improved.

[0186] Table 5 Comparison of hardness (HRC) of TMC0-TMC6 before and after ion nitriding treatment

[0187]

[0188] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The specification and examples given are exemplary only and the application is not limited to the exact structure described in the specification and shown in the figures. Various modifications and changes can be made in the arrangement and details of the application without departing from the scope thereof.

Claims

1. A method for preparing a high-strength, high-hardness multi-element alloy titanium-based composite material, characterized in that, The method comprises the following steps: (S1) configuring raw materials according to the elemental composition of the substrate, and then adding a reinforcing phase to obtain an alloy material, wherein the elemental composition of the substrate is 5-5.5% of Al, 2-2.5% of Nb, 1.5-1.7% of Fe, 1.4-1.45% of Mo, 1.25-1.35% of V, 0.8-1.2% of Zr, and the balance of Ti, the reinforcing phase comprises La2O3, and further comprises TiB and / or TiC, and the mass percentage of the reinforcing phase in the titanium-based composite material is 3.02-5.5%; (S2) obtaining a titanium-based composite material ingot by vacuum suspension melting of the alloy material; (S3) obtaining a high-strength and high-hardness multi-element alloy titanium-based composite material by hot rolling the titanium-based composite material ingot in the (α+β) phase region for at least four passes.

2. The method of claim 1, wherein: The high-strength and high-hardness multi-element alloy titanium-based composite material is subjected to ion nitriding treatment, and the hardness of the titanium-based composite material is further improved.

3. The preparation method according to claim 1, characterized in that, In step (S2), the specific process of the vacuum suspension melting comprises the following steps: (S2.1) placing the alloy material in a crucible; (S2.2) vacuumizing the furnace of the vacuum water-cooled copper crucible suspension melting furnace, filling argon, and connecting the power supply; (S2.3) melting at a power of 70-140 kw, and then refining at a power of 130-140 kw; (S2.4) repeating the melting and refining process for at least 5 times by turning over the alloy, and naturally cooling the furnace after the refining is completed, discharging the gas, and obtaining a titanium-based composite material ingot.

4. The method of claim 1, wherein: In step (S3), the opening rolling temperature of each pass of hot rolling is 1200-1250 K, and the final rolling temperature is 1175-1200 K.

5. The method of claim 1, wherein: In step (S3), the intermediate annealing treatment at a temperature of 1190-1220 K for 0.5-6 h is performed between the hot rolling passes.

6. The method of claim 1, wherein: In step (S1), the elements Ti, Al, Nb, Fe, Mo, V, and Zr in the substrate are added in the form of titanium sponge, high-purity aluminum, niobium-titanium alloy, iron particles, titanium-molybdenum alloy, vanadium-aluminum alloy, and zirconium sponge, respectively; and the TiB, TiC, and La2O3 in the reinforcing phase are added in the form of titanium diboride, graphite powder, and lanthanum oxide, respectively.

7. The method of claim 6, wherein: The titanium diboride and the graphite powder are respectively synthesized by in-situ autogenic reaction to synthesize TiB and TiC, and the in-situ autogenic reaction is shown in the following formula: , .

8. The preparation method according to claim 3, characterized in that: The vacuum degree in the step (S2.2) is 3.5 x 10 -2 ~ 4 x 10 -2 Pa, and the argon pressure is 0.07 ~ 0.09 MPa.

9. The method of claim 3, wherein: In step (S2.3), the melting at a power of 70-140 kw is sequentially performed at a power of 70-80 kw, 90-100 kw, 110-120 kw, and 130-140 kw, and then refining is performed at a power of 130-140 kw.

10. A high-strength and high-hardness multi-element alloy titanium-based composite material prepared by the preparation method of any one of claims 1-9.

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