CN113088735B - Method for preparing high-strength plastic titanium-graphene composite material based on grading compounding - Google Patents
Method for preparing high-strength plastic titanium-graphene composite material based on grading compounding Download PDFInfo
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Abstract
The invention belongs to the technical field of advanced metal matrix composite material preparation, and particularly relates to a method for preparing a high-strength plastic titanium-graphene composite material based on grading compounding. Adding graphene powder materials or titanium alloy powder into a ball milling tank for ball milling in two steps, and performing densification sintering molding to obtain a high-strength plastic titanium-graphene composite material with a hierarchical scale structure; the graphene microchip is used as a reinforcement, titanium and titanium alloy are used as a matrix, a hierarchical composite configuration design is adopted, and the powder form of the graphene or titanium alloy matrix is regulated and controlled step by step, so that on one hand, the deformation behavior in the material is changed by regulating the nonuniformity of the graphene of the reinforcement and TiC synthesized in situ in the matrix and on the other hand, the difference of the scale structure is formed by regulating the nonuniformity of the particle size of the matrix, and the problem of high strength and low plasticity of the titanium-based composite material in the past is solved.
Description
Technical Field
The invention belongs to the technical field of advanced metal matrix composite material preparation, and particularly relates to a method for preparing a graphene-titanium composite material based on hierarchical composite design to increase high strength and plasticity.
Background
The titanium and titanium alloy material has the advantages of low density, high specific strength, excellent corrosion resistance, good high-temperature performance and the like, is an ideal light high-strength structural material, can play a great application value in the field of aerospace, and is as small as fasteners such as nuts and screws and as large as structural members such as a frame of a machine body, a partition frame and the like. The rapid development of modern industrial technology continuously puts higher requirements on the further popularization and application of ferroalloy materials, and the prepared titanium-based composite material with higher toughness and matching meets the application requirements under more severe conditions, which is a hotspot of the research in the field of titanium alloys at present.
In recent years, from carbon atoms in sp2The novel two-dimensional material graphene with the thickness of the monoatomic layer formed by the hybrid track becomes a research hotspot, and can be used as an ideal reinforcement of a metal-based composite material due to excellent mechanical and physical properties. The graphene is used as a reinforcing phase, and the synthesis of in-situ TiC particles is realized, so that the method has important practical significance for developing the application prospect of titanium and titanium alloy. In the conventional titanium alloy preparation process, due to the constraint of the conventional thinking, most researchers always pursue the reinforcing phase and matrix structure of the composite material in uniform distribution even if different preparation methods, different reinforcing phases and different titanium alloy matrixes are adopted. However, a great deal of research results show that the titanium composite material with uniformly distributed reinforcing phase only shows limited strengthening effect and poor plasticity, and particularly the titanium composite material prepared by the powder metallurgy method shows great room temperature brittleness. The improvement and optimization of the preparation process of the titanium-based composite material and the regulation and control of the microstructure (the type, the grain size, the form, the distribution and the like of the reinforcing phase) are always considered to be one of the most effective ways for improving the high toughness of the titanium-based composite material. Research shows that the bottleneck problem encountered by the powder metallurgy method can be solved by carrying out configuration design on the metal material to generate a heterogeneous matrix structure with a multi-scale structure. Ma et al (Journal of the Minerals 58(2006)49-53) have proposed various solutions including the introduction of coarser grains in the finer microstructure to form a dual or multi-scale structure, the introduction of nano twins, etc. it was found that when the microstructure inside the metallic material is composed of grains of two different sizes, i.e. a dual-scale grain size distribution is formed, the metallic material has a higher strength and good plasticity.
Disclosure of Invention
The invention aims to provide a method for preparing a high-strength plastic titanium-graphene composite material by using graphene nanoplatelets as reinforcements and titanium alloy as matrixes in a grading and compounding manner, and the high-strength plastic titanium-based composite material is prepared by using low-cost powder metallurgy. By adopting a hierarchical composite structure design, the powder form of the graphene or titanium alloy matrix is regulated and controlled by adding step by step, on one hand, the non-uniformity of the enhanced graphene and the in-situ synthesized TiC thereof in the matrix is regulated and controlled, on the other hand, the difference of the size structure is formed by regulating and controlling the non-uniformity of the particle size of the matrix, the deformation behavior in the material is changed, and further, the high-strength plastic titanium-based composite material with comprehensive performance is obtained, and the problem of high strength and low plasticity of the conventional titanium-based composite material is solved.
The technical scheme for solving the technical problems is as follows:
graphene reinforcement or titanium alloy matrix powder is added step by step in the ball milling process, and the reinforcement and the matrix are strongly impacted and ground by using a hard alloy grinding ball in the ball milling process to generate graphene micro-sheets with uneven sheet diameter and thickness and different shapes and matrix powder with different sizes and shapes. On one hand, because the titanium alloy matrix powder particles are added step by step, the titanium alloy matrix powder particles have different degrees of strong plastic deformation to form uneven particle size distribution, so that the stress state and the strain distribution of the composite material in the deformation process are influenced. On the other hand, due to the fact that graphene microchip powder is added step by step, the defects of graphene and different deformation degrees caused by the fact that the sheet diameter and thickness are refined due to the original Van der Waals force are overcome under the high-energy ball milling. And moreover, the titanium alloy powder generates a high-activity rough surface under high-energy ball milling, so that the graphene can be more closely adsorbed and embedded into the surface of the matrix titanium alloy powder, the chemical activity of the graphene and the matrix titanium alloy powder in the ball milling process is further induced, and the in-situ multi-scale formation of TiC particles is promoted. And then the composite powder is subjected to short-time and high-efficiency plasma rapid sintering to control the growth of matrix grains, so that the titanium-graphene composite material with the multi-level-scale heterostructure is prepared. Under certain kinetic and thermodynamic conditions in the sintering process, due to the fact that graphene micro-sheets added step by step are different in shape and uneven in size, titanium alloy powder reacts to form a large amount of uneven TiC nano-phases, meanwhile, a small amount of graphene remains, dispersion strengthening and pinning bridging effects are generated, and strength is improved. After the titanium alloy matrix powder added step by step is sintered, crystal grains also present an organization structure with uneven size, and the organization has deformation gradient due to different deformation difficulty degrees. And when the heterogeneous tissue with the particle size difference deforms, the stored dislocation can coordinate with the deformation gradient and increase along with the increase of strain distribution, so that additional processing hardening is caused, and the mechanical performance is more matched. By designing the hierarchical composite structure of the titanium-graphene composite material, the graphene/titanium carbide synergistically reinforced heterogeneous titanium alloy-based composite material can be prepared, the defects that the homogeneous composite material shows limited reinforcing effect and seriously damages plasticity in the traditional powder metallurgy preparation process are overcome, and strong plasticity matching is realized.
The invention has the beneficial effects that:
compared with the prior art, the invention has the beneficial effects that:
1. the shape and distribution of graphene or matrix powder are regulated and controlled by adding step by step, on one hand, the internal deformation behavior of the material is changed by regulating and controlling the nonuniformity of the enhanced graphene and the TiC synthesized in situ in the matrix and forming the difference in scale structure by regulating and controlling the nonuniformity of the matrix particle size, and further the high-strength plastic titanium-based composite material with comprehensive performance is obtained.
2. Based on kinetics and thermodynamics in the sintering process, the shapes of graphene nanoplatelets added step by step are regulated and controlled to be different and the sizes of the graphene nanoplatelets are not uniform, titanium alloy powder reacts to form a large amount of non-uniform TiC nanophase, and meanwhile, a small amount of graphene is remained to generate the effects of dispersion strengthening and pinning bridging, so that the strength is improved. After the titanium alloy matrix powder added step by step is sintered, crystal grains also present an organization structure with uneven size, and the organization has deformation gradient due to different deformation difficulty degrees. And when the heterogeneous tissue with the particle size difference deforms, the stored dislocation can coordinate with the deformation gradient and increase along with the increase of strain distribution, so that additional processing hardening is caused, and the mechanical performance is more matched.
3. By adopting the design of hierarchical composite configuration of the titanium-graphene composite material, the limited enhancement effect of the homogeneous composite material in the traditional powder metallurgy preparation process is overcome, the graphene/titanium carbide synergistically enhanced heterogeneous titanium alloy-based composite material is prepared, and the strong plasticity matching is realized.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is SEM images of the titanium-graphene composite ball-milled powder prepared by the invention on a tungsten filament SEM by a factor of 200 and a factor of 500, wherein (a) - (i) are the ball-milled powders prepared in examples 1-7 and comparative examples 1-2 respectively;
fig. 2 is a raman spectrum comparison graph of the titanium-graphene composite ball-milled powder prepared in example 2 and comparative example 2 of the present invention and the original pure graphene nanoplatelets;
FIG. 3 is a graph showing mechanical properties of the composite materials prepared in comparative examples 1-2 and examples 2-4.
Detailed Description
Example 1:
respectively weighing 0.1g of graphene nanoplatelets with the sheet diameter of 1 mu m and 100g of TC4 powder with the particle diameter of 200 meshes, putting the graphene nanoplatelets or the TC4 powder into a ball milling tank for ball milling in two steps, filling argon into the ball milling tank for protection, and adopting alcohol as a process control agent;
during ball milling in the first step, 50g of TC4 powder and all graphene nanoplatelets are placed in a stainless steel ball milling tank, and ball milling is carried out on a planetary mill for 120 min; the grinding balls are tungsten carbide balls with the diameters of 8mm, 5mm and 2mm respectively, the mass ratio is 5:3:2, the ball-material ratio is 20:1, and the rotating speed is 300 r/min.
During the second step of ball milling, after the stainless steel tank is cooled, adding the rest 50g of TC4 powder into the mixed powder obtained by the first step of ball milling, continuing ball milling for 120min to obtain heterogeneous dispersed titanium-graphene composite powder, taking out and carrying out vacuum packaging; performing densification sintering molding to obtain a high-strength and high-toughness titanium-graphene composite material with a hierarchical scale structure; and carrying out densification sintering molding by using a plasma rapid sintering technology, wherein the sintering temperature is 1100 ℃, the sintering time is 8min, the heating rate is 50 ℃/min, the pressure is 60MPa, and after sintering, cooling to room temperature along with a furnace to obtain the high-strength and high-toughness titanium-graphene composite material.
Example 2:
respectively weighing 0.5g of graphene micro-sheets with the sheet diameter of 3 mu m and 100g of Ti powder with the particle diameter of 500 meshes, putting the graphene micro-sheets or the Ti powder into a ball milling tank for ball milling in two steps, filling argon into the ball milling tank for protection, and adopting alcohol as a process control agent;
during the first step of ball milling, 80g of Ti powder and all graphene nanoplatelets are placed in a stainless steel ball milling tank, and ball milling is carried out on a planetary mill for 240 min; the grinding balls are tungsten carbide balls with the diameters of 8mm, 5mm and 2mm respectively, the mass ratio is 5:3:2, the ball-material ratio is 10:1, and the rotating speed is 300 r/min.
During the second step of ball milling, after the stainless steel tank is cooled, adding the rest 20g of Ti powder into the mixed powder obtained by the first step of ball milling, continuing ball milling for 60min to obtain heterogeneous dispersed titanium-graphene composite powder, taking out and carrying out vacuum packaging; performing densification sintering molding to obtain a high-strength and high-toughness titanium-graphene composite material with a hierarchical scale structure; and carrying out densification sintering molding by using a plasma rapid sintering technology, wherein the sintering temperature is 900 ℃, the sintering time is 5min, the heating rate is 100 ℃/min, the pressure is 60MPa, and after sintering, cooling to room temperature along with a furnace to obtain the high-strength and high-toughness titanium-graphene composite material.
Example 3:
respectively weighing 0.3g of graphene micro-sheets with the sheet diameter of 2 mu m and 100g of Ti powder with the particle diameter of 500 meshes, putting the graphene micro-sheets or the Ti powder into a ball milling tank for ball milling in two steps, filling argon into the ball milling tank for protection, and adopting alcohol as a process control agent;
during the first step of ball milling, 0.15g of graphene nanoplatelets and all Ti powder are put into a stainless steel ball milling tank, and ball milling is carried out on a planetary mill for 240 min; the grinding balls are tungsten carbide balls with the diameters of 8mm, 5mm and 2mm respectively, the mass ratio is 5:3:2, the ball-material ratio is 10:1, and the rotating speed is 300 r/min.
During the second step of ball milling, after the stainless steel tank is cooled, adding the rest 0.15g of graphene nanoplatelets into the mixed powder obtained by the first step of ball milling, continuing ball milling for 60min to obtain heterogeneously dispersed titanium-graphene composite powder, taking out and carrying out vacuum packaging; performing densification sintering molding to obtain a high-strength and high-toughness titanium-graphene composite material with a hierarchical scale structure; and carrying out densification sintering molding by using a plasma rapid sintering technology, wherein the sintering temperature is 1000 ℃, the sintering time is 5min, the heating rate is 100 ℃/min, the pressure is 45MPa, and after sintering, cooling to room temperature along with a furnace to obtain the high-strength and high-toughness titanium-graphene composite material.
Example 4:
respectively weighing 0.1g of graphene micro-sheets with the sheet diameter of 2 mu m and 100g of Ti powder with the particle diameter of 500 meshes, putting the graphene micro-sheets or the Ti powder into a ball milling tank for ball milling in two steps, filling argon into the ball milling tank for protection, and adopting alcohol as a process control agent;
during the first step of ball milling, 80g of Ti powder and all graphene nanoplatelets are placed in a stainless steel ball milling tank, and ball milling is carried out on a planetary mill for 240 min; the grinding balls are tungsten carbide balls with the diameters of 8mm, 5mm and 2mm respectively, the mass ratio is 5:3:2, the ball-material ratio is 10:1, and the rotating speed is 300 r/min.
During the second step of ball milling, after the stainless steel tank is cooled, adding the rest 20g of Ti powder into the mixed powder obtained by the first step of ball milling, continuing ball milling for 60min to obtain heterogeneous dispersed titanium-graphene composite powder, taking out and carrying out vacuum packaging; performing densification sintering molding to obtain a high-strength and high-toughness titanium-graphene composite material with a hierarchical scale structure; and carrying out densification sintering molding by using a plasma rapid sintering technology, wherein the sintering temperature is 1000 ℃, the sintering time is 5min, the heating rate is 100 ℃/min, the pressure is 45MPa, and after sintering, cooling to room temperature along with a furnace to obtain the high-strength and high-toughness titanium-graphene composite material.
Example 5:
respectively weighing 0.3g of graphene nanoplatelets with the sheet diameter of 3 mu m, 80g of TC4 powder with the particle size of 100 meshes and 20g of Ti spherical powder with the particle size of 250 meshes, filling argon gas into a ball milling tank for protection, and adopting alcohol as a process control agent;
during the first step of ball milling, 80g of TC4 powder and all graphene nanoplatelets are placed in a stainless steel ball milling tank, and ball milling is carried out on a planetary mill for 300 min; the grinding balls are tungsten carbide balls with the diameters of 8mm, 5mm and 2mm respectively, the mass ratio is 5:3:2, the ball-material ratio is 10:1, and the rotating speed is 300 r/min.
During the second step of ball milling, after the stainless steel tank is cooled, adding the rest 20g of Ti powder into the mixed powder obtained by the first step of ball milling, continuing ball milling for 60min to obtain heterogeneous dispersed titanium-graphene composite powder, taking out and carrying out vacuum packaging; performing densification sintering molding to obtain a high-strength and high-toughness titanium-graphene composite material with a hierarchical scale structure; and carrying out densification sintering molding by using a plasma rapid sintering technology, wherein the sintering temperature is 800 ℃, the sintering time is 10min, the heating rate is 150 ℃/min, the pressure is 45MPa, and after sintering, cooling to room temperature along with a furnace to obtain the high-strength and high-toughness titanium-graphene composite material.
Example 6:
respectively weighing 5g of graphene micro-tablets with the plate diameter of 1 mu m, 500g of TC4 powder with the particle size of 300 meshes, 200g of Ti spherical powder with the particle size of 250 meshes and 100g of CT20 powder with the particle size of 200 meshes, filling argon into a ball milling tank for protection, and adopting alcohol as a process control agent;
during the first step of ball milling, 500g of TC4 powder and all graphene nanoplatelets are placed in a stainless steel ball milling tank, and ball milling is carried out on a planetary mill for 60 min; the grinding balls are tungsten carbide balls with the diameters of 8mm, 5mm and 2mm respectively, the mass ratio is 5:3:2, the ball-material ratio is 50:1, and the rotating speed is 120 r/min.
During ball milling in the second step, after a stainless steel tank is cooled, adding 200g of Ti powder and 100g of CT20 powder into the mixed powder obtained by ball milling in the first step, continuing ball milling for 120min to obtain heterogeneous dispersed titanium-graphene composite powder, taking out and carrying out vacuum packaging; performing densification sintering molding to obtain a high-strength and high-toughness titanium-graphene composite material with a hierarchical scale structure; and carrying out densification sintering molding by using a plasma rapid sintering technology, wherein the sintering temperature is 900 ℃, the sintering time is 8min, the heating rate is 100 ℃/min, the pressure is 60MPa, and after sintering, cooling to room temperature along with a furnace to obtain the high-strength and high-toughness titanium-graphene composite material.
Example 7:
respectively weighing 2.5g of graphene micro-tablets with the diameter of 1 mu m and 500g of CT20 powder with the particle diameter of 300 meshes, filling argon into a ball milling tank for protection, and adopting alcohol as a process control agent;
during the first step of ball milling, 1.5g of graphene nanoplatelets and all CT20 powder are put into a stainless steel ball milling tank and ball milled on a planetary mill for 200 min; the grinding balls are tungsten carbide balls with the diameters of 8mm, 5mm and 2mm respectively, the mass ratio is 5:3:2, the ball material ratio is 30:1, and the rotating speed is 600 r/min.
During the second step of ball milling, after the stainless steel tank is cooled, 1g of graphene nanoplatelets are added into the mixed powder obtained in the first step of ball milling, the ball milling is continued for 100min to obtain heterogeneous dispersed titanium-graphene composite powder, and the heterogeneous dispersed titanium-graphene composite powder is taken out for vacuum packaging; performing densification sintering molding to obtain a high-strength and high-toughness titanium-graphene composite material with a hierarchical scale structure; and carrying out densification sintering molding by using a plasma rapid sintering technology, wherein the sintering temperature is 800 ℃, the sintering time is 5min, the heating rate is 50 ℃/min, the pressure is 30MPa, and after sintering, cooling to room temperature along with a furnace to obtain the high-strength and high-toughness titanium-graphene composite material.
Comparative example 1:
the difference from example 1 is that:
and (3) directly performing densification sintering molding on the pure Ti powder with the same quantity instead of the graphene micro-sheets and the TC4 powder.
Comparative example 2:
the difference from example 1 is that:
and (3) ball-milling the graphene nanoplatelets with the same amount and the TC4 powder with the same amount by adopting a one-step ball milling method, wherein the ball-milling parameters are the same as those of the first step ball-milling parameter in the example 1, and then performing densification sintering molding.
Microstructure characterization and mechanical property test are respectively carried out on the titanium-graphene composite materials prepared in the examples 1-7 and the comparative examples 1-2, and the attached drawings 1(a) - (i) are scanning electron microscope SEM images of the titanium-graphene composite material ball-milling powder prepared in the examples 1-7 and the comparative examples 1-2 on a tungsten filament scanning electron microscope by multiples of 200 and 500 respectively; as can be seen from a comparison between fig. 1(c) and fig. 1(h, i), the graphene flakes are embedded in the surface of the Ti spherical powder in fig. 1(c) due to the strong collision during the high-energy ball milling. Meanwhile, transparent graphene sheets are agglomerated and dispersed among the ball-milling powder in a certain thickness. Due to the short high energy ball milling time (60min) experienced by the graphene sheets added in the second step, insufficient to be adsorbed and embedded into the surface of the Ti spherical powder. So that the graphene presents a multi-scale distribution. As can be seen from a comparison between fig. 1(d) and fig. 1(h, i), the surface of the powder after ball milling is often rough and the powder exhibits different forms in fig. 1 (d). Has particles close to spherical shape and flaky powder particles subjected to high-energy ball milling for a long time. The reason is that the Ti spherical powder is added in two steps, so that the Ti spherical powder is subjected to different degrees of strong plastic deformation under different high-energy ball milling times, and the matrix powder is in multi-scale distribution.
FIG. 2 shows Raman spectra at 200-3000 cm-1The powder and the pristine graphene prepared in example 2 and comparative example 2 were characterized within the range. As can be seen from the figure, the graphene nanoplatelets have three obvious characteristic peaks, namely a D peak (about 1340 cm)-1Defect peak), G peak (-1580 cm-1) And 2D peak (-2700 cm)-1) And in the original graphene Raman spectrum, the intensity of a defect peak, namely a D peak, is lower than that of a G peak, which shows that the graphene has a complete structure and small defects. In contrast, in comparative example 2, when the same amount of graphene nanoplatelets and the same amount of TC4 powder were used to prepare a graphene/TC 4 mixed powder by a one-step ball milling method, it was observed that the diffraction peak D was substantially disappeared, the diffraction peak intensity of the G peak was decreased, and the diffraction peak was decreased at 418cm-1And 605cm-1A raman peak appears corresponding to the characteristic peak of TiC, indicating the formation of a significant amount of titanium carbide. While the composite powder in example 2 has a Raman curve with an increased D peak intensity, i.e. ID/IGThere is an increasing tendency to produce the raman peak of TiC. The method shows that in the process of high-energy ball milling, certain stripping and defects are generated in the graphene sheet, and certain interface reaction is generated between the defects and the surface of the titanium ball to generate TiC.
FIG. 3 is a graph showing mechanical properties of the composite materials prepared in comparative examples 1 to 2 and examples 2 to 4, and it can be seen from FIG. 3 that the compressive yield strength of the as-received pure titanium material is 250.03MPa and the compressive strength thereof is 874.58MPa when the strain at break is 30%. While examples 2, 3 and 4 had compressive yield strengths of 1249.24MPa, 1178.44MPa and 880.1MPa, respectively, and strain at break of 28.3%, 29.5% and 20.6%, respectively. Comparative example 2 since the graphene is substantially completely reacted to form titanium carbide distributed at the grain boundary, the composite material exhibits brittle fracture characteristics and has a very poor strong plastic matching degree. The comparison shows that the strength of the titanium alloy can be greatly improved, the plasticity of the titanium alloy can be regulated and controlled, the high plasticity matching of 1249.24 MPa-28.3% which is far better than that of the original matrix is realized, and the theoretical and technical guarantee is provided for future aviation equipment materials in China. The main factor influencing the difference of the mechanical behavior of the material is due to the hierarchical composite configuration design in the invention. By adding titanium alloy matrix powder or graphene powder step by step, the influence of high-energy ball milling is different, so that the internal deformation mechanism of the material is changed. When the titanium alloy matrix powder is added step by step, due to different degrees of strong plastic deformation which occur successively, uneven particle size distribution is generated so as to form an inhomogeneous structure, so that dislocation stored due to the size difference of crystal grains in the material deformation process affects the distribution of strain, and sufficient plasticity can be ensured. When the graphene is added step by step, the graphene powder generates defects, peeling and deformation in different degrees after being subjected to high-energy ball milling, a large amount of uneven TiC phases are formed after sintering, a small amount of residual graphene plays the roles of pinning and bridging, the expansion of cracks can be inhibited, dispersion strengthening and graphene load transfer strengthening are generated simultaneously, and the strength is improved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiment according to the present invention are within the scope of the present invention.
Claims (6)
1. The method for preparing the high-strength plastic titanium-graphene composite material based on the hierarchical compounding is characterized in that graphene powder materials or titanium alloy powder are added into a ball milling tank for ball milling in two steps, and the method comprises the following specific steps:
respectively weighing 0.1-5 g of graphene powder material and 100-1000 g of titanium alloy powder, putting the graphene powder material or the titanium alloy powder into a ball milling tank for ball milling in two steps, filling argon into the ball milling tank for protection, and adopting alcohol as a process control agent;
during the first step of ball milling, 50-80% of titanium alloy powder and all graphene powder materials or 10-30% of graphene powder materials and all titanium alloy powder are put into a ball milling tank for ball milling for 60-300 min; during the second step of ball milling, adding the titanium alloy powder or graphene powder material with the residual mass into the mixed powder obtained in the first step of ball milling, continuing ball milling for 60-120min to obtain heterogeneous dispersed titanium-graphene composite powder, and performing densification sintering molding to obtain the high-strength and high-toughness titanium-graphene composite material with a hierarchical scale structure;
the titanium alloy powder is alpha titanium alloy powder or low-alloyed alpha + beta titanium alloy powder prepared by a rotary electrode method;
the graphene powder material is graphene nanoplatelets, and the sheet diameter is 1-3 mu m;
the titanium alloy powder is Ti, TC4 or CT 20.
2. The method for preparing the high-strength plastic titanium-graphene composite material based on the hierarchical composition as claimed in claim 1, wherein the particle size of the titanium alloy powder is 100-500 mesh.
3. The method for preparing the high-strength and high-plasticity titanium-graphene composite material based on the hierarchical composition according to claim 1, wherein the densification, sintering and molding are carried out at a sintering temperature of 800-1100 ℃ for 5-10 min at a heating rate of 50-150 ℃/min under a pressure of 30-60 MPa, and after sintering, the temperature is reduced to room temperature along with furnace cooling to obtain the high-strength and high-toughness titanium-graphene composite material.
4. The method for preparing the high-strength plastic titanium-graphene composite material based on the hierarchical composition as claimed in claim 1, wherein the grinding balls in the ball-milling tank are tungsten carbide balls, the diameters of the tungsten carbide balls are 8mm, 5mm and 2mm respectively, the mass ratio is 5:3:2, the ball-to-material ratio is 10-50: 1, and the rotation speed is 120-.
5. The method for preparing the high-strength plastic titanium-graphene composite material based on the hierarchical composition according to claim 1, wherein the densification sintering molding is performed by a plasma rapid sintering technology.
6. The method for preparing the high-strength plastic titanium-graphene composite material based on the hierarchical composition as claimed in claim 1, wherein the titanium-graphene composite powder is taken out for vacuum packaging after the second ball milling step is completed, and then densification sintering molding is performed.
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