Multi-element micro-nano-scale particle reinforced titanium-based composite material and preparation method thereof

Abstract

The invention discloses a multi-element micro-nano-scale particle reinforced titanium-based composite material and a preparation method thereof, and belongs to the technical field of titanium-based composite materials. According to the invention, two reinforced phases of Ti5Si3 and TiC are designed and generated, and the content and proportion of the TiC and Ti5Si3 reinforced phases are changed by changing the combination of the two reinforcements, i.e., changing the content and proportion of the Ti5Si3 reinforced phases. Based on the combination of a bionic structure design concept and a net structure design concept, the multi-element micro-nano dual-scale particle reinforced titanium-based composite cast ingot is obtained through smelting. Compared with the prior art, the method has the advantages that the cost is reduced, the distribution of the reinforced phases is improved, the problems of strength and plasticity inversion of the discontinuous particle reinforced titanium-based composite material can be effectively solved by constructing the reinforced phases with different levels and different scales in the matrix, and the titanium-based composite material with excellent comprehensive performance is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of titanium-based composite materials, and in particular to a multi-element micro-nano-scale particle-reinforced titanium-based composite material and a preparation method thereof. Background Art

[0002] Discontinuously reinforced titanium-based composites (DRTMCs) refer to composite materials in which discontinuous reinforcement phases (such as particles, fibers, etc.) are dispersed in a titanium matrix. Compared with continuously reinforced materials, they have lighter weight and better fatigue performance, and are suitable for fields with high performance requirements such as automotive structural parts and aerospace engine components.

[0003] Compared with discontinuously reinforced titanium-based composites, traditional single-phase homogenized titanium-based composites are mainly focused on the regulation of compatibility and uniformity of distribution between the reinforcing phase and the interface. Due to the introduction of reinforcing phases such as particles, whiskers, and fibers, while improving properties such as strength and wear resistance, the deformation mismatch between the reinforcing phase and the titanium matrix leads to a significant decrease in the deformation coordination ability of the composite under high stress, while the plasticity is not effectively improved, resulting in the so-called strength-plasticity inversion phenomenon. This phenomenon is particularly evident in titanium alloys (such as Ti6Al4V), which makes the material more susceptible to brittle failure in high-load applications, affecting its overall performance.

[0004] Chinese patent document CN117660798A discloses a high-strength-plastic matching three-level multi-scale discontinuous heterogeneous structure reinforced titanium-based composite material and its preparation method, the method comprising: 1. adjusting the activity, particle size and surface modification of amorphous cracked carbon particles; 2. dispersing to obtain a suspension; 3. adding titanium-based powder while stirring at room temperature to obtain a mixed solution; 4. stirring and evaporating to dryness; 5. low-energy ball milling; 6. low-temperature short-time large pulse current spark plasma sintering. The present invention uses defect-free, highly active and highly dispersed nearly spherical amorphous cracked carbon particles as reinforcement phase precursors, fully interacting, coating, and in-situ reacting with titanium-based powders to generate titanium carbide and diffusely precipitate ultrafine titanium carbide and nano-reinforcement phases, constructing a three-level multi-scale heterogeneous structure reinforced titanium-based composite material, while improving strength, retaining or improving plasticity, and achieving high-strength-plastic matching of titanium-based composite materials; the titanium-based composite material is significantly superior to traditional titanium-based composite materials in terms of strength-plastic matching. Although this scheme points out that controlling the volume fraction of reinforcement can reduce grain boundaries and phase boundaries, in actual applications, the addition of reinforcement may affect grain growth and phase transformation due to volume constraints, which may cause material brittleness problems. Therefore, it is necessary to find a balance between the volume fraction of reinforcement and material strength to achieve the required material performance. Summary of the invention

[0005] The main purpose of the present invention is to propose a multi-element micro-nano scale particle reinforced titanium-based composite material and a preparation method thereof. The present invention can effectively improve the strength and plastic inversion problems of discontinuous particle reinforced titanium-based composite materials by constructing reinforcement phases of different levels and scales in the matrix, thereby obtaining a titanium-based composite material with excellent comprehensive performance.

[0006] To achieve the above-mentioned purpose, the present invention proposes a multi-element micro-nano-scale particle reinforced titanium-based composite material, comprising a matrix material and a reinforcing phase; the matrix material is TC4 (Ti-6Al-4V); the reinforcing phase is composed of Ti5Si3 and TiC; the volume fraction of the reinforcing phase in the total volume of the titanium-based composite material is 3-9%; the volume ratio of the reinforcing phase TiC:Ti5Si3 is 1-2:1.

[0007] The present invention also provides a method for preparing the above multi-element micro-nano particle reinforced titanium-based composite material, comprising the following steps:

[0008] S1 uses commercial Ti-6Al-4V (TC4) alloy, Si powder and C powder as raw materials, calculates the amount of each raw material and configures each raw material according to the volume fraction and volume ratio of the reinforcement phase in the multi-element multi-scale particle reinforced titanium matrix composite material through the in-situ reaction formula;

[0009] S2 places the raw materials in a vacuum non-consumable arc furnace for smelting, then pours the melt into a metal mold, and after cooling, cuts the obtained ingot to obtain a multi-element micro-nano particle reinforced titanium-based composite material.

[0010] Preferably, the purity of Si powder in step S1 is 99.0-99.9%, and the particle size is 700-900 nm.

[0011] Preferably, the purity of the C powder in step S1 is 99.0-99.9%, and the particle size is 80-150 nm.

[0012] Preferably, during the smelting process in step S2, the current of the electric arc furnace is 220-250A, the smelting time is 3-5min, and the furnace temperature is 2800-3000°C.

[0013] Preferably, the melting process in step S2 needs to be turned over, which can reduce bubbles and non-uniformity in the material, ensure uniform distribution of the reinforcing particles in the matrix, and improve the overall performance of the composite material.

[0014] Preferably, the flipping times is 5-6 times.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention uses commercial Ti-6Al-4V (TC4) alloy, Si powder and C powder as raw materials, and prepares a micro-nano dual-scale near-net (TiC+Ti5Si3) / TC4 composite material by melt-casting in-situ autogenous technology; the multi-element and multi-scale structured TMCs have good coordinated deformation ability and excellent mechanical properties. By constructing reinforcement phases of different levels and scales in the matrix, the strength and toughness inversion problem of DRTMCs can be effectively improved;

[0017] 2. The titanium-based composite material prepared by the present invention has a micro-nanoscale structure, which can suppress local strain concentration, induce back stress geometric dislocation strengthening and local plastic deformation strengthening; compared with existing titanium-based composite materials, the TMCs prepared by combining the micro-nanoscale and discontinuous network structure design concepts adopted in the present invention have excellent comprehensive performance and are expected to break the strength-plasticity inversion barrier. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 XRD patterns of the multi-element and multi-scale particle-reinforced titanium-based composite materials prepared in Examples 1-6 of the present invention;

[0020] Figure 2 This is a SEM morphology image of the multi-element and multi-scale particle reinforced titanium-based composite material prepared in Example 1 of the present invention;

[0021] Figure 3 The room temperature compression performance curve of the multi-element and multi-scale particle reinforced titanium-based composite material prepared in Examples 1-6 of the present invention;

[0022] Figure 4 This is a SEM morphology image of the multi-element and multi-scale particle reinforced titanium-based composite material prepared in Example 2 of the present invention;

[0023] Figure 5 This is a SEM morphology image of the multi-element and multi-scale particle reinforced titanium-based composite material prepared in Example 3 of the present invention;

[0024] Figure 6 This is a SEM morphology image of the multi-element and multi-scale particle reinforced titanium-based composite material prepared in Example 4 of the present invention;

[0025] Figure 7This is a SEM morphology image of the multi-element and multi-scale particle reinforced titanium-based composite material prepared in Example 5 of the present invention;

[0026] Figure 8 This is a SEM morphology image of the multi-element and multi-scale particle reinforced titanium-based composite material prepared in Example 6 of the present invention;

[0027] Fig. 9 The present invention is a flow chart of the preparation process of the multi-element and multi-scale particle reinforced titanium-based composite material. DETAILED DESCRIPTION

[0028] To make the purpose, technical scheme and advantages of the embodiment of the present invention clearer, the technical scheme in the embodiment of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiment, it is carried out according to the normal conditions or the conditions recommended by the manufacturer. If the reagents or instruments used do not specify the manufacturer, they are all conventional products that can be purchased commercially. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes, taking "A and / or B" as an example, including scheme A, or scheme B, or schemes that A and B meet at the same time. In addition, the technical schemes between the various embodiments can be combined with each other, but must be based on the ability of ordinary technicians in the field to achieve. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that the combination of such technical solutions does not exist, and is not within the scope of protection required by the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present invention.

[0029] In order to solve the technical problem that titanium alloys (such as Ti6Al4V) are prone to brittle failure in high-load applications, however, traditional single-phase homogenized titanium-based composites are mainly focused on the regulation of compatibility and uniformity of the reinforcing phase and interface. Due to the introduction of reinforcing phases such as particles, whiskers, and fibers, while improving the strength and wear resistance, the local stress concentration and deformation mismatch between the reinforcing phase and the Ti matrix lead to the strength-plasticity inversion problem. Although the mesh structure design improves the strength of the composite material to a certain extent, due to the characteristics of the raw materials themselves, the reinforcing phase is only distributed at the mesh structure interface, and there is almost no reinforcing phase distribution in the crystal, especially in the β-Ti of the Ti6Al4V (TC4) alloy, so the reinforcement effect is limited.

[0030] To further improve the performance of the material, we can learn from the design of nacre in nature. Due to its unique micro- and nano-scale brickwork structure, nacre can effectively disperse stress under external forces and improve overall impact resistance and ductility. Drawing on this design, we try to introduce multiphase micro-nano structures into titanium-based composites to achieve synergy between different reinforcing phases; and construct multiphase and multiscale (especially micro-nanoscale) titanium-based composites to better achieve strength-ductility synergy.

[0031] In terms of specific reinforcement phase selection, TiC particles have high elastic modulus and hardness, excellent thermal stability and other characteristics. Dispersed TiC particles can also refine the matrix grains. Appropriate size of TiC can effectively improve the strength and wear resistance of composite materials. Intermetallic compound Ti5Si3 has high melting temperature (2130℃), low density (4.32g / cm 3 ) has a linear expansion coefficient similar to that of the Ti matrix and maintains high strength and excellent oxidation and creep resistance at 1200°C, so it is considered to be a promising candidate material for reinforcement phase.

[0032] The present invention can effectively improve the strength and plastic inversion problems of DRTMCs by constructing reinforcement phases TiC and Ti5Si3 of different levels and scales in the matrix. According to the Ti-Si phase diagram, during the melting and casting process, the Si element is dissolved into the β-Ti phase, and during the cooling process, due to the transformation of β to α, the supersaturated Si element gradually precipitates in the β-Ti phase in the form of Ti5Si3, and plays a strengthening role, hindering the slip of dislocations and improving the mechanical strength of the material; on the one hand, in Ti alloys, the Si element is a β-Ti stabilizing element; on the other hand, the solubility of the Si element in the β-Ti phase decreases with the decrease of temperature, and more Si elements are precipitated, which increases the uniformity of the microstructure and the stability of the phase. The present invention improves the composite material strength of the material by controlling the content and proportion of the reinforcement phase, and can also maintain good toughness under dynamic load and reduce the risk of brittle fracture.

[0033] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments and drawings. It should be understood that the following embodiments are only used to explain the present invention and are not used to limit the present invention.

[0034] Example 1

[0035] A method for preparing a multi-element micro-nano particle reinforced titanium-based composite material comprises the following steps:

[0036] S1 uses commercial Ti-6Al-4V alloy, Si powder with a purity of 99% and an average particle size of 800nm, and C powder with a purity of 99.8% and an average particle size of 100nm as raw materials, and calculates and determines that the mass percentages of the components of the cast titanium-based composite material are 0.4wt% Si powder, 0.42wt% C powder, and 99.18wt% TC4 according to the volume fractions of the reinforcing phases Ti5Si3 and TiC are 1.5% and 1.5% respectively through the in-situ reaction formula, and configures the raw materials;

[0037] S2 Wrap the C powder and Si powder with aluminum foil respectively to prevent splashing during the smelting process, and then put each raw material into a water-cooled copper crucible and place it in a vacuum non-consumable arc furnace for smelting. The current of the arc furnace is 240A, the smelting time is 4 minutes, and the furnace temperature is 2900°C; during the smelting process, the sample needs to be turned over 6 times, and the obtained melt is poured into a metal mold. After cooling to room temperature, the obtained ingot is cut to obtain a multi-element micro-nano scale particle reinforced titanium-based composite material, recorded as TMCs-1.

[0038] The phase analysis of the titanium-based composite material prepared in Example 1 was performed using an X-ray diffractometer. Figure 1 As shown in Figure 2, the composite material is mainly composed of α-Ti, β-Ti, TiC and Ti5Si3 phases.

[0039] The structure of TMCs-1 was observed by SEM electron microscope. Figure 2 As shown, the TiC phase is micron-sized and evenly distributed at the matrix grain boundaries in the shape of short rods. A small amount of fine nano-Ti5Si3 particles are precipitated at the β-Ti phase and the α / β interface. The reinforcement phase is evenly distributed without obvious aggregation.

[0040] The multi-element micro-nano-scale particle reinforced titanium-based composite material obtained in Example 1 was processed into a standard specimen according to the national standard GB / T228.1-2010, and then subjected to room temperature compression test on an MTS810 electronic universal testing machine. The compression strain rate was 1.38×10 -4 s -1 Among them, the room temperature compressive strength is 1690MPa, the compression plasticity is 24.76%, and the room temperature compression test performance is as follows Figure 3 shown.

[0041] Example 2

[0042] A method for preparing a multi-element micro-nano particle reinforced titanium-based composite material comprises the following steps:

[0043] S1 uses commercial Ti-6Al-4V alloy, Si powder with a purity of 99% and an average particle size of 800nm, and C powder with a purity of 99.8% and an average particle size of 100nm as raw materials, and calculates and determines that the mass percentages of each component of the cast titanium-based composite material are 0.80wt% Si powder, 0.85wt% C powder, and 98.35wt% TC4 according to the volume fractions of the reinforcing phases Ti5Si3 and TiC, respectively, of 3% and 3%, respectively, through the in-situ reaction formula, and configures each raw material;

[0044] S2 Wrap the C powder and Si powder with aluminum foil respectively to prevent splashing during the smelting process, and then put each raw material into a water-cooled copper crucible and place it in a vacuum non-consumable arc furnace for smelting. The current of the arc furnace is 220A, the smelting time is 5min, and the furnace temperature is 3000℃; during the smelting process, the sample needs to be turned over 6 times, and the obtained melt is poured into a metal mold. After cooling to room temperature, the obtained ingot is cut to obtain a multi-element micro-nano scale particle reinforced titanium-based composite material, recorded as TMCs-2.

[0045] The as-cast structure of TMCs-2 was observed by SEM electron microscope. Figure 4 As shown in the figure, TiC is evenly distributed at the matrix grain boundaries in the form of short feathers, and a small amount of spherical nano-Ti5Si3 particles are precipitated in the β-Ti phase and TiC phase.

[0046] The experimental standard, sample size, experimental equipment and other parameters used are exactly the same as those of the room temperature compression test in Example 1. The room temperature compression performance of TMCs-2 is tested. The test results show that the room temperature compressive strength of TMCs-2 is 1800MPa, the compression plasticity is 24.89%, and the room temperature compression test performance is as follows: Figure 3 shown.

[0047] Example 3

[0048] A method for preparing a multi-element micro-nano particle reinforced titanium-based composite material comprises the following steps:

[0049] S1 uses commercial Ti-6Al-4V alloy, Si powder with a purity of 99% and an average particle size of 800nm, and C powder with a purity of 99.8% and an average particle size of 100nm as raw materials, and calculates and determines that the mass percentages of the components of the cast titanium-based composite material are 1.21wt% Si powder, 1.03wt% C powder, and 97.76wt% TC4 according to the volume fractions of the reinforcing phases Ti5Si3 and TiC, respectively, of 4.5% and 4.5%, respectively, through the in-situ reaction formula, and configures the raw materials;

[0050] S2 Wrap the C powder and Si powder with aluminum foil respectively to prevent splashing during the smelting process, and then put each raw material into a water-cooled copper crucible and place it in a vacuum non-consumable arc furnace for smelting. The current of the arc furnace is 250A, the smelting time is 3min, and the furnace temperature is 2800℃; during the smelting process, the sample needs to be turned over 6 times, and the obtained melt is poured into a metal mold. After cooling to room temperature, the obtained ingot is cut to obtain a multi-element micro-nano scale particle reinforced titanium-based composite material, recorded as TMCs-3.

[0051] The structure of TMCs-3 was observed by SEM electron microscope. Figure 5 As shown in the figure, a large number of equiaxed TiC particles are distributed at the matrix grain boundaries, a small number of spherical Ti5Si3 particles are precipitated at the β-Ti grain boundaries, and more spherical Ti5Si3 particles are connected to each other and attached to the TiC particles.

[0052] The room temperature compression performance of TMCs-3 was tested using the same experimental standard, sample size, experimental equipment and other parameters as those used in the room temperature compression test in Example 1. The test results of TMCs-3 showed that the room temperature compressive strength was 1840 MPa, the compression plasticity was 22.65%, and the room temperature compression test performance was as follows: Figure 3 shown.

[0053] Example 4

[0054] A method for preparing a multi-element micro-nano particle reinforced titanium-based composite material comprises the following steps:

[0055] S1 uses commercial Ti-6Al-4V alloy, Si powder with a purity of 99% and an average particle size of 800nm, and C powder with a purity of 99.8% and an average particle size of 100nm as raw materials, and calculates and determines that the mass percentages of each component of the cast titanium-based composite material are 0.20wt% Si powder, 0.42wt% C powder, and 99.38wt% TC4 according to the volume fractions of the reinforcing phases Ti5Si3 and TiC being 1% and 2% respectively through the in-situ reaction formula, and configures each raw material;

[0056] S2 Wrap the C powder and Si powder with aluminum foil respectively to prevent splashing during the smelting process, and then put each raw material into a water-cooled copper crucible and place it in a vacuum non-consumable arc furnace for smelting. The current of the arc furnace is 230A, the smelting time is 4min, and the furnace temperature is 2850℃; during the smelting process, the sample needs to be turned over 5 times, and the obtained melt is poured into a metal mold. After cooling to room temperature, the obtained ingot is cut to obtain a multi-element micro-nano-scale particle reinforced titanium-based composite material, recorded as TMCs-4.

[0057] The structure of TMCs-4 was observed by SEM electron microscope. Figure 6As shown, the microstructure of the composite is similar to that of TMCs-1, which indicates that the change of a small amount of reinforcement phase has little effect on the microstructure of the composite.

[0058] The room temperature compression performance of TMCs-4 was tested using the same experimental standard, sample size, experimental equipment and other parameters as those used in the room temperature compression test in Example 1. Among them, the room temperature compressive strength of TMCs-4 was 1620 MPa, the compression plasticity was 22.50%, and the room temperature compression test performance was as follows: Figure 3 shown.

[0059] Example 5

[0060] A method for preparing a multi-element micro-nano particle reinforced titanium-based composite material comprises the following steps:

[0061] S1 uses commercial Ti-6Al-4V alloy, Si powder with a purity of 99% and an average particle size of 800nm, and C powder with a purity of 99.8% and an average particle size of 100nm as raw materials, and calculates and determines that the mass percentages of each component of the cast titanium-based composite material are 0.48wt% Si powder, 0.93wt% C powder, and 98.59wt% TC4 according to the volume fractions of the reinforcing phases Ti5Si3 and TiC being 2% and 4% respectively through the in-situ reaction formula, and configures each raw material;

[0062] S2 Wrap the C powder and Si powder with aluminum foil respectively to prevent splashing during the smelting process, and then put each raw material into a water-cooled copper crucible and place it in a vacuum non-consumable arc furnace for smelting. The current of the arc furnace is 235A, the smelting time is 5min, and the furnace temperature is 2830℃; during the smelting process, the sample needs to be turned over 6 times, and the obtained melt is poured into a metal mold. After cooling to room temperature, the obtained ingot is cut to obtain a multi-element micro-nano-scale particle reinforced titanium-based composite material, recorded as TMCs-5.

[0063] The structure of TMCs-5 was observed by SEM electron microscope. Figure 7 As shown in the figure, the morphology of TiC gradually evolved from short feathers to spherical particles, and there were still a small number of Ti5Si3 particles distributed near the TiC particles.

[0064] The room temperature compression performance of TMCs-5 was tested using the same experimental standard, sample size, experimental equipment and other parameters as those used in the room temperature compression test in Example 1. The room temperature compressive strength of TMCs-5 was 1740 MPa, the compression plasticity was 26.85%, and the room temperature compression test performance was as follows: Figure 3 shown.

[0065] Example 6

[0066] A method for preparing a multi-element micro-nano particle reinforced titanium-based composite material comprises the following steps:

[0067] S1 uses commercial Ti-6Al-4V alloy, Si powder with a purity of 99% and an average particle size of 800nm, and C powder with a purity of 99.8% and an average particle size of 100nm as raw materials, and calculates and determines that the mass percentages of each component of the cast titanium-based composite material are 0.80wt% Si powder, 1.42wt% C powder, and 97.78wt% TC4 according to the volume fractions of the reinforcing phases Ti5Si3 and TiC, respectively, of 3% and 6%, respectively, through the in-situ reaction formula, and configures each raw material;

[0068] S2 Wrap the C powder and Si powder with aluminum foil respectively to prevent splashing during the smelting process, and then put each raw material into a water-cooled copper crucible and place it in a vacuum non-consumable arc furnace for smelting. The current of the arc furnace is 250A, the smelting time is 3min, and the furnace temperature is 3000℃; during the smelting process, the sample needs to be turned over 6 times, and the obtained melt is poured into a metal mold. After cooling to room temperature, the obtained ingot is cut to obtain a multi-element micro-nano-scale particle reinforced titanium-based composite material, recorded as TMCs-6.

[0069] The structure of TMCs-6 was observed by SEM electron microscope. Figure 8 As shown, although the β-Ti in the composite material is very fine, there are still a large number of Ti5Si3 particles precipitated in the β-Ti, and TiC is evenly distributed in a spherical shape.

[0070] The room temperature compression performance of TMCs-6 was tested using the same experimental standard, sample size, experimental equipment and other parameters as those used in the room temperature compression test in Example 1. The room temperature compressive strength of TMCs-6 was 1640 MPa, the compression plasticity was 22.85%, and the room temperature compression test performance was as follows: Figure 3 shown.

[0071] In the above embodiments, the components of each titanium-based composite material are summarized in Table 1 below:

[0072] Table 1 Titanium-based composite materials composition

[0073] Composition (vol.%) TMCs-1 <![CDATA[1.5%TiC、1.5%Ti5Si3、97%TC4]]> TMCs-2 <![CDATA[3%TiC、3%Ti5Si3、94%TC4]]> TMCs-3 <![CDATA[4.5%TiC、4.5%Ti5Si3、91%TC4]]> TMCs-4 <![CDATA[2%TiC、1%Ti5Si3、97%TC4]]> TMCs-5 <![CDATA[4%TiC、2%Ti5Si3、94%TC4]]> TMCs-6 <![CDATA[6%TiC、3%Ti5Si3、91%TC4]]>

[0074] The room temperature compression performance tests were performed on the titanium-based composite materials obtained in Examples 1-6, and the results are shown in Table 2.

[0075] Table 2 Room temperature compression performance test of titanium matrix composites

[0076]

[0077]

[0078] It can be seen from the experimental results in Table 2 that the titanium-based composite material of the present invention has good room temperature compression performance.

[0079] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the patent protection scope of the present invention.

Claims

1. A multi-element micro-nano particle reinforced titanium-based composite material, characterized in that: It comprises a matrix material and a reinforcement phase; the matrix material is TC4; the reinforcement phase is composed of Ti5Si3 and TiC; the volume fraction of the reinforcement phase in the total volume of the titanium-based composite material is 3-9%; and the volume ratio of the reinforcement phase TiC:Ti5Si3 is 1-2:

1.

2. A method for preparing the composite material according to claim 1, characterized in that: The following steps are involved: S1 uses commercial TC4 alloy, Si powder and C powder as raw materials, calculates the amount of each raw material and configures each raw material according to the volume fraction and volume ratio of the reinforcement phase in the multi-element multi-scale particle reinforced titanium matrix composite material through the in-situ reaction formula; S2 places the raw materials in a vacuum non-consumable arc furnace for smelting, then pours the melt into a metal mold, and after cooling, cuts the obtained ingot to obtain a multi-element micro-nano particle reinforced titanium-based composite material.

3. The method for preparing the composite material according to claim 2, characterized in that: In the step S1, the purity of Si powder is 99.0-99.9%, and the particle size is 700-900 nm.

4. The method for preparing the composite material according to claim 2, characterized in that: In the step S1, the purity of the C powder is 99.0-99.9%, and the particle size is 80-150 nm.

5. The method for preparing the composite material according to claim 2, characterized in that: During the smelting process in step S2, the current of the electric arc furnace is 220-250A, the smelting time is 3-5min, and the furnace temperature is 2800-3000°C.

6. The method for preparing the composite material according to claim 2, characterized in that: In the step S2, the smelting process needs to be turned over, and the number of turns is 5-6 times.

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