Preparation method of high-toughness Mg-Ti composite material

Abstract

The application discloses a preparation method of high-toughness Mg-Ti composite material, and comprises the following steps: firstly, mixing Mg powder and Ti powder and then performing discharge plasma sintering; secondly, preheating the sintered composite material in a copper lining pipe; and thirdly, performing multi-pass lining pipe rotary swaging deformation on the preheated copper lining pipe containing the sintered composite material, so as to obtain high-toughness Mg-Ti composite material with fine-grained structure in the copper lining pipe. The application successfully realizes large plastic deformation of the high-toughness Mg-Ti composite material by mixing Mg powder and Ti powder, performing discharge plasma sintering, and then performing multi-pass lining pipe rotary swaging deformation in the copper lining pipe, so that the high-toughness Mg-Ti composite material with fine-grained structure is obtained in the copper lining pipe, the strength and plasticity of the material are improved, the problem that it is difficult to uniformly distribute Ti particles in the Mg matrix is solved, and the comprehensive performance of the Mg-Ti composite material is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-toughness magnesium-based composite materials, and particularly relates to a preparation method of high-toughness Mg-Ti composite material. BACKGROUND

[0002] Magnesium and magnesium alloys are widely used in aerospace, rail transportation and 3C products due to their low density, high specific strength and specific modulus, excellent thermal conductivity and other advantages, and become potential lightweight materials to comply with the concept of low-carbon development. However, magnesium alloys still have some limitations, such as low absolute strength and poor corrosion resistance. Therefore, the comprehensive performance of magnesium alloys is optimized by introducing reinforcing bodies into the magnesium matrix. Magnesium-based composite materials are composed of magnesium matrix and particles, fibers, whiskers, lamellar metals or non-metals, and have higher strength and plasticity than traditional magnesium alloys, greatly expanding the application prospect of magnesium materials.

[0003] Ti can be added to the Mg matrix as a hard reinforcing phase due to its high melting point, high modulus, good strength and plasticity, low mutual solubility with Mg, and good compatibility between the two. The Mg-Ti composite material formed can improve the strength and ductility of the base material. At present, stirring casting is one of the common methods for preparing Mg-Ti composite materials. Due to the large difference in density between Mg and Ti, Ti particles are prone to sedimentation during the melting process, which seriously limits the recovery rate of Ti in magnesium alloys. In addition, the interface bonding mode of Mg-Ti composite materials prepared by powder metallurgy is solid-solid bonding, which has the problem of weak interface strength.

[0004] Therefore, a method for preparing high-toughness Mg-Ti composite material by copper-lined tube rotary forging after powder sintering is needed. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a preparation method of high-toughness Mg-Ti composite material to solve the above-mentioned problems of the prior art. The method successfully realizes large plastic deformation of high-toughness Mg-Ti composite material by mixing Mg powder and Ti powder, then performing discharge plasma sintering, and then performing multi-pass lining tube rotary forging deformation in a copper-lined tube, thereby obtaining high-toughness Mg-Ti composite material with fine-grained structure in the copper-lined tube, greatly improving the strength and plasticity of the material, solving the problem that Ti particles are difficult to uniformly distribute in the Mg matrix in Mg-Ti composite material, improving the strength and plasticity contribution of the reinforcing phase to the matrix, and improving the comprehensive performance of Mg-Ti composite material.

[0006] To solve the above technical problems, the technical scheme adopted by the present application is: a preparation method of high-toughness Mg-Ti composite material, characterized in that the method comprises the following steps:

[0007] Step one, after mixing Mg powder and Ti powder, discharge plasma sintering is carried out to obtain sintered composite material;

[0008] Step two, the sintered composite material obtained in step one is loaded into a copper lining pipe with inner wall smeared with lubricating liquid, and then preheating treatment is carried out to obtain a preheated copper lining pipe loaded with sintered composite material;

[0009] Step three, the preheated copper lining pipe loaded with sintered composite material obtained in step two is subjected to multi-pass lining pipe rotary swaging deformation to obtain high strength and toughness Mg-Ti composite material with fine grain structure in the copper lining pipe; the tensile strength of the Mg-Ti composite material can be up to 420 MPa, and the elongation can be up to 14.5%; re-preheating treatment is carried out before each pass of the lining pipe rotary swaging deformation.

[0010] The present application uniformly distributes Ti particles by mixing Mg powder and Ti powder and then carrying out discharge plasma sintering, so that there are no problems such as agglomeration and adhesion, and sintered composite material is obtained. By smearing lubricating liquid in the copper lining pipe, adhesion of the composite material to the inner wall of the copper pipe due to friction during deformation is prevented, and adverse metallurgical reactions are avoided. The present application enhances the deformation ability of the copper lining pipe by preheating. The present application successfully realizes large plastic deformation of high strength and toughness Mg-Ti composite material by carrying out multi-pass lining pipe rotary swaging deformation on the copper lining pipe loaded with sintered composite material, thereby obtaining high strength and toughness Mg-Ti composite material with fine grain structure in the copper lining pipe, greatly improving the strength and plasticity of the material. The present application reduces the work hardening of the copper pipe and the composite material by re-preheating before each pass of rotary swaging deformation, reduces the deformation resistance of the next pass, and prevents cracking of the lining pipe or the composite material during deformation.

[0011] The above-mentioned method for preparing high strength and toughness Mg-Ti composite material is characterized in that the particle size of the Mg powder and the Ti powder in step one is 45-53 μm, the mixing mass ratio of the Mg powder and the Ti powder is 8-9:1-2, the temperature of the discharge plasma sintering is 450-500°C, the time is 20-30 min, the pressure is 30-150 MPa, and the density of the sintered composite material is not less than 99%. By controlling the particle size of the Mg powder and the Ti powder, the powders are uniformly mixed during the mixing process. If the powder is too fine, agglomeration is easy to occur, and if the particle size is too large, the performance of the composite material is adversely affected. By controlling the mixing mass ratio of the Mg powder and the Ti powder, Mg-Ti composite materials with different compositions can be prepared to meet different use requirements. By controlling the discharge plasma sintering parameters and the density of the sintered composite material, defects and pores are reduced, which is beneficial to the strengthening and toughening of the composite material during subsequent rotary swaging.

[0012] The preparation method of the high-toughness Mg-Ti composite material has the characteristics that the wall thickness of the copper lining pipe in the second step is 1-1.5 mm, and the lubricating liquid is composed of graphite and butter with a mass ratio of 1:8-13. The copper lining pipe mainly plays a role of constraint and deformation transmission in the present application. The wall thickness of the copper lining pipe is controlled to prevent rupture during the deformation process caused by too thin wall thickness, and to avoid the increase of deformation resistance caused by too thick wall thickness, thereby improving the deformation resistance. The ratio of graphite and butter is controlled to reduce the friction between the composite material and the inner wall of the lining pipe during the deformation process, to prevent excessive adhesion and adverse metallurgical reactions. Therefore, the addition of butter can form a lubricating film between the composite material and the inner wall of the lining pipe, thereby reducing the friction. In addition, since force transmission exists during the deformation process, the process can damage the local lubricating film. The addition of a small amount of graphite can play a replacement role when the local lubricating film is damaged, thereby making up for the deficiency of the failure of the local single lubricating film. In summary, the mixture of graphite and butter with the above ratio is used as the lubricant.

[0013] The preparation method of the high-toughness Mg-Ti composite material has the characteristics that the wall thickness of the copper lining pipe in the second step is 1-1.5 mm, and the lubricating liquid is composed of graphite and butter with a mass ratio of 1:8-13. The copper lining pipe mainly plays a role of constraint and deformation transmission in the present application. The wall thickness of the copper lining pipe is controlled to prevent rupture during the deformation process caused by too thin wall thickness, and to avoid the increase of deformation resistance caused by too thick wall thickness, thereby improving the deformation resistance. The ratio of graphite and butter is controlled to reduce the friction between the composite material and the inner wall of the lining pipe during the deformation process, to prevent excessive adhesion and adverse metallurgical reactions. Therefore, the addition of butter can form a lubricating film between the composite material and the inner wall of the lining pipe, thereby reducing the friction. In addition, since force transmission exists during the deformation process, the process can damage the local lubricating film. The addition of a small amount of graphite can play a replacement role when the local lubricating film is damaged, thereby making up for the deficiency of the failure of the local single lubricating film. In summary, the mixture of graphite and butter with the above ratio is used as the lubricant.

[0014] The preparation method of the high-toughness Mg-Ti composite material has the characteristics that the wall thickness of the copper lining pipe in the second step is 1-1.5 mm, and the lubricating liquid is composed of graphite and butter with a mass ratio of 1:8-13. The copper lining pipe mainly plays a role of constraint and deformation transmission in the present application. The wall thickness of the copper lining pipe is controlled to prevent rupture during the deformation process caused by too thin wall thickness, and to avoid the increase of deformation resistance caused by too thick wall thickness, thereby improving the deformation resistance. The ratio of graphite and butter is controlled to reduce the friction between the composite material and the inner wall of the lining pipe during the deformation process, to prevent excessive adhesion and adverse metallurgical reactions. Therefore, the addition of butter can form a lubricating film between the composite material and the inner wall of the lining pipe, thereby reducing the friction. In addition, since force transmission exists during the deformation process, the process can damage the local lubricating film. The addition of a small amount of graphite can play a replacement role when the local lubricating film is damaged, thereby making up for the deficiency of the failure of the local single lubricating film. In summary, the mixture of graphite and butter with the above ratio is used as the lubricant.

[0015] Compared with the prior art, the present application has the following advantages:

[0016] 1. The application successfully realizes large plastic deformation of high strength and toughness Mg-Ti composite material by mixing Mg powder and Ti powder, then performing discharge plasma sintering, and then placing in a copper lining pipe for multi-pass lining pipe rotary swaging deformation, so that high strength and toughness Mg-Ti composite material with fine grain structure is obtained in the copper lining pipe, the strength and plasticity of the material are greatly improved, the problem of uneven distribution of Ti particles in the Mg matrix of Mg-Ti composite material is solved, the strength and plasticity contribution of the reinforcing phase to the matrix is improved, and the comprehensive performance of Mg-Ti composite material is improved.

[0017] 2. The application successfully realizes large plastic deformation of the material by adopting the lining pipe rotary swaging method, so that Mg-Ti composite material with fine grain structure is obtained, and the strength and plasticity of the material are greatly improved. Since magnesium has a close-packed hexagonal structure, the plastic deformation ability of the material is poor due to the fewer slip systems, and rolling and other traditional processing technologies are prone to cause cracking of Mg-Ti composite material.

[0018] 3. The Mg-Ti composite material prepared by the application has uniform Ti particle distribution and high matrix grain size, and the strength and ductility are significantly improved, overcoming the problems existing in traditional preparation methods, thereby obtaining magnesium-based composite material with excellent strength and plasticity, and the prepared Mg-Ti composite material has fine grain structure.

[0019] 4. The application adopts copper pipe as lining pipe in the rotary swaging process, has certain heat preservation effect, effectively retains the heat required by Mg-Ti composite material in the plastic deformation process, reduces the processing difficulty caused by temperature drop, and the copper pipe has strong ductility, which is convenient for transferring rotary swaging deformation, coordinating and controlling the plastic deformation of magnesium material, improving the deformation ability of magnesium, so that the material can be fully deformed, under the action of heat and force coupling, the microstructure of Mg-Ti composite material changes significantly, further improving its strength and plasticity, in addition, the copper pipe can constrain the plastic flow of the material, thereby effectively preventing the generation of cracks under large deformation, which is beneficial to reduce the rotary swaging pass and improve the processing efficiency.

[0020] 5. The application coats lubricating liquid in the copper lining pipe to prevent the composite material from adhering to the inner wall of the copper pipe due to friction during deformation and causing adverse metallurgical reaction. The material prepared by the application can make Ti particles uniformly distributed, and there is no problem of agglomeration and adhesion.

[0021] 6. The application has the technical advantages of simple operation, stable process and green environmental protection, can flexibly adjust the deformation degree in the processing process, can achieve single-pass large plastic deformation, and effectively improves the problem of insufficient plasticity of the material under high strength.

[0022] 7、The present application re-heats before each pass of rotary forging deformation, reduces work hardening of copper pipe and composite material, reduces deformation resistance of next pass, and prevents cracking of lining pipe or composite material during deformation.

[0023] The technical solutions of the present application are described in further detail below with reference to the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic diagram of the copper lining pipe with sintered composite material obtained by the present application.

[0025] Figure 2 is a structural schematic diagram of the copper lining pipe with sintered composite material obtained by the present application after preheating after rotary forging deformation.

[0026] Figure 3 is a low-magnification microstructure morphology diagram of the sintered composite material obtained by example 1 of the present application.

[0027] Figure 4 is a high-magnification microstructure morphology diagram of the sintered composite material obtained by example 1 of the present application.

[0028] Figure 5 is a low-magnification microstructure morphology diagram of the high-strength and high-toughness Mg-Ti composite material obtained by example 1 of the present application.

[0029] Figure 6 is a high-magnification microstructure morphology diagram of the high-strength and high-toughness Mg-Ti composite material obtained by example 1 of the present application.

[0030] Figure 7 is a stress-strain curve diagram of the Mg-Ti composite material obtained by example 1 of the present application.

[0031] Figure 8 is a stress-strain curve diagram of the Mg-Ti composite material obtained by example 2 of the present application.

[0032] Figure 9 is a stress-strain curve diagram of the Mg-Ti composite material obtained by example 3 of the present application.

[0033] Figure 10 is a stress-strain curve diagram of the Mg-Ti composite material obtained by example 4 of the present application.

[0034] Figure 11 is a stress-strain curve diagram of the Mg-Ti composite material obtained by example 5 of the present application. DETAILED DESCRIPTION

[0035] Figure 1 is a structural schematic diagram of the copper lining pipe with sintered composite material obtained by the present application, from Figure 1As can be seen from the figure, the sintered composite material is installed in the copper lining pipe.

[0036] Figure 2 is a structural schematic diagram of the preheated copper lining pipe with sintered composite material after rotary swaging deformation of the present application, from Figure 2 As can be seen from the figure, the Mg-Ti composite material is obtained in the copper lining pipe.

[0037] Example 1

[0038] The present example comprises the following steps:

[0039] Step one, AZ91 powder with a particle size of 48 μm and Ti powder with a particle size of 45 μm to 53 μm are mixed and then subjected to spark plasma sintering to obtain a sintered composite material; the mixing mass ratio of the AZ91 powder and the Ti powder is 9:1, the temperature of the spark plasma sintering is 450°C, the time is 23 min, and the pressure is 40 MPa, and the density of the sintered composite material is not less than 99%;

[0040] Step two, the sintered composite material obtained in step one is installed in a copper lining pipe with a lubricating liquid applied to the inner wall, and then subjected to preheating treatment to obtain a preheated copper lining pipe with sintered composite material; the wall thickness of the copper lining pipe is 1.2 mm, the lubricating liquid is composed of graphite and butter with a mass ratio of 1:13, and the preheating temperature is 400°C with a holding time of 30 min;

[0041] Step three, the preheated copper lining pipe with sintered composite material obtained in step two is subjected to multi-pass lining pipe rotary swaging deformation to obtain high strength and toughness Mg-Ti composite material with fine grain structure in the copper lining pipe; re-preheating treatment is performed before each pass of the lining pipe rotary swaging deformation; the multi-pass lining pipe rotary swaging deformation has 2 passes, the diameter of the sintered composite material before rotary swaging is 12.1 mm, the diameter of the material changes to 12.1 mm→10.3 mm→8.0 mm after 2 passes of rotary swaging deformation, the deformation amount of the lining pipe rotary swaging is 56%, and the re-preheating temperature is 400°C with a holding time of 10 min.

[0042] Figure 3 is a low magnification microstructure morphology diagram of the sintered composite material obtained in the present example, from Figure 3 As can be seen from the figure, the material surface is free of defects such as pores and cracks, the Ti particles are uniformly distributed on the magnesium matrix, and a large amount of agglomeration does not occur, and the material has high density.

[0043] Figure 4 is a high magnification microstructure morphology diagram of the sintered composite material obtained in the present example, from Figure 4 As can be seen from the figure, no metallurgical bonding is generated on the clean Mg-Ti interface, and no transition layer and intermetallic phase are formed at the interface.

[0044] Figure 5 is a low-magnification microstructure morphology of the high-strength and high-toughness Mg-Ti composite material obtained in this example, from which Figure 5 It can be seen from the figure that the magnesium matrix grains are significantly refined and the size distribution is uneven, and the Ti particles are uniformly distributed on the magnesium matrix and are significantly broken.

[0045] Figure 6 is a high-magnification microstructure morphology of the high-strength and high-toughness Mg-Ti composite material obtained in this example, from which Figure 6 It can be seen from the figure that the interface around the Ti particles does not appear to be cracked or have voids, and the broken Ti particles can reduce stress concentration in the matrix around the particles and improve the ductility of the Mg-Ti composite material.

[0046] Figure 7 is a stress-strain curve of the Mg-Ti composite material obtained in this example, from which Figure 7 It can be seen from the figure that the tensile strength of the Mg-Ti composite material obtained in this example is 410 MPa, and the elongation is 14.5%.

[0047] Example 2

[0048] This example includes the following steps:

[0049] Step one, mixing AZ91 powder with a particle size of 48 μm and Ti powder with a particle size of 45 μm to 53 μm and then performing discharge plasma sintering to obtain a sintered composite material; the mixing mass ratio of the AZ91 powder and the Ti powder is 8.5:1.5, the discharge plasma sintering temperature is 500°C, the time is 30 min, and the pressure is 30 MPa, and the density of the sintered composite material is not less than 99%;

[0050] Step two, loading the sintered composite material obtained in step one into a copper lining pipe with a lubricating liquid applied to the inner wall, and then performing preheating treatment to obtain a preheated copper lining pipe loaded with the sintered composite material; the wall thickness of the copper lining pipe is 1 mm, the lubricating liquid is composed of graphite and butter with a mass ratio of 1:10, and the preheating temperature is 400°C and the holding time is 30 min;

[0051] Step three, performing multi-pass lining pipe rotary swaging deformation on the preheated copper lining pipe loaded with the sintered composite material obtained in step two to obtain a high-strength and high-toughness Mg-Ti composite material with fine-grained structure in the copper lining pipe; re-preheating treatment is performed before each pass of the lining pipe rotary swaging deformation; the multi-pass lining pipe rotary swaging deformation has one pass, the diameter of the Mg-Ti material before rotary swaging is 13.0 mm, the diameter is reduced to 11.8 mm after one pass of rotary swaging, the deformation amount of the lining pipe rotary swaging is 18%, and the re-preheating temperature is 350°C and the holding time is 15 min.

[0052] Figure 8 is a stress-strain curve of the Mg-Ti composite material obtained in this embodiment, from which Figure 8 It can be seen from the figure that the tensile strength of the Mg-Ti composite material obtained in this embodiment is 390 MPa, and the elongation is 13%.

[0053] Example 3

[0054] This embodiment comprises the following steps:

[0055] Step 1: AZ91 powder with a particle size of 48 μm and Ti powder with a particle size of 45 μm to 53 μm are mixed and then subjected to spark plasma sintering to obtain a sintered composite material; the mixing mass ratio of the AZ91 powder and the Ti powder is 9:1, the temperature of the spark plasma sintering is 450°C, the time is 30 min, and the pressure is 30 MPa, and the density of the sintered composite material is not less than 99%;

[0056] Step 2: the sintered composite material obtained in Step 1 is loaded into a copper lining pipe with the inner wall smeared with a lubricating liquid, and then subjected to preheating treatment to obtain a preheated copper lining pipe loaded with the sintered composite material; the wall thickness of the copper lining pipe is 1 mm, the lubricating liquid is composed of graphite and butter with a mass ratio of 1:8, and the preheating temperature is 380°C, and the holding time is 30 min;

[0057] Step 3: the preheated copper lining pipe loaded with the sintered composite material obtained in Step 2 is subjected to multi-pass lining pipe rotary swaging deformation to obtain a high-strength and high-toughness Mg-Ti composite material with fine-grained structure in the copper lining pipe; re-preheating treatment is performed before each pass of the lining pipe rotary swaging deformation; the processing pass of the multi-pass lining pipe rotary swaging deformation is 1 pass, the diameter of the sintered composite material before rotary swaging is 14.2 mm, the diameter is reduced to Φ12.4 mm after 1 pass of rotary swaging, the deformation amount of the lining pipe rotary swaging is 24%, and the re-preheating temperature is 400°C, and the holding time is 12 min.

[0058] Figure 9 is a stress-strain curve of the Mg-Ti composite material obtained in this embodiment, from which Figure 9 It can be seen from the figure that the tensile strength of the Mg-Ti composite material obtained in this embodiment is 398 MPa, and the elongation is 13%.

[0059] Example 4

[0060] This embodiment comprises the following steps:

[0061] Step one, mixing AZ91 powder with particle size of 48 μm and Ti powder with particle size of 45 μm-53 μm, then carrying out spark plasma sintering to obtain sintered composite material; the mixing mass ratio of the AZ91 powder and the Ti powder is 8:2, the temperature of the spark plasma sintering is 480 ℃, the time is 20 min, and the pressure is 80 MPa, and the density of the sintered composite material is not less than 99%;

[0062] Step two, loading the sintered composite material obtained in step one into a copper lining pipe with inner wall smeared with lubricating liquid, then carrying out preheating treatment to obtain a preheated copper lining pipe loaded with sintered composite material; the wall thickness of the copper lining pipe is 1.5 mm, the lubricating liquid is composed of graphite and butter with a mass ratio of 1:12; the preheating temperature is 400 ℃, and the holding time is 15 min;

[0063] Step three, carrying out multi-pass lining pipe rotary swaging deformation on the preheated copper lining pipe loaded with sintered composite material obtained in step two to obtain high-strength and high-toughness Mg-Ti composite material with fine grain structure in the copper lining pipe; re-preheating treatment is carried out before each pass of the lining pipe rotary swaging deformation; the processing pass of the multi-pass lining pipe rotary swaging deformation is 2, the diameter of the sintered composite material before rotary swaging is 14.5 mm, after 2 passes of rotary swaging deformation, the diameter changes to 14.5 mm→11.7 mm→9.4 mm, the deformation amount of the lining pipe rotary swaging is 58%, the re-preheating temperature is 400 ℃, and the holding time is 10 min.

[0064] Figure 10 is the stress-strain curve of the Mg-Ti composite material obtained in this embodiment, from which it can be seen that the tensile strength of the Mg-Ti composite material obtained in this embodiment is 412 MPa, and the elongation is 13%. Figure 10

[0065] Embodiment 5

[0066] This embodiment includes the following steps:

[0067] Step one, mixing AZ91 powder with particle size of 48 μm and Ti powder with particle size of 45 μm-53 μm, then carrying out spark plasma sintering to obtain sintered composite material; the mixing mass ratio of the AZ91 powder and the Ti powder is 9:1, the temperature of the spark plasma sintering is 450 ℃, the time is 20 min, and the pressure is 150 MPa, and the density of the sintered composite material is not less than 99%;

[0068] ​Step two, the sintered composite material obtained in step one is put into a copper lining pipe with inner wall coated with lubricating liquid, and then preheating treatment is carried out to obtain a preheated copper lining pipe with sintered composite material; the wall thickness of the copper lining pipe is 1.2 mm, the lubricating liquid is composed of graphite and butter with a mass ratio of 1:9; the preheating temperature is 450℃, and the holding time is 20 min;

[0069] Step three, the preheated copper lining pipe with sintered composite material obtained in step two is subjected to multi-pass lining pipe rotary swaging deformation to obtain high strength and toughness Mg-Ti composite material with fine grain structure in the copper lining pipe; re-preheating treatment is carried out before each pass of the lining pipe rotary swaging deformation; the processing pass of the multi-pass lining pipe rotary swaging deformation is 5 times, the diameter of the sintered composite material before rotary swaging is 15.1 mm, and after 5 passes of rotary swaging deformation, the diameter changes to 15.1 mm→13.8 mm→12.2 mm→10.4 mm→9.4 mm→6.8 mm, the deformation amount of the lining pipe rotary swaging is 80%, the re-preheating temperature is 450℃, and the holding time is 10 min.

[0070] Figure 11 is the stress-strain curve of the Mg-Ti composite material obtained in embodiment 5 of the present application, from which Figure 11 it can be seen that the tensile strength of the Mg-Ti composite material obtained in this embodiment is 420 MPa, and the elongation is 11%.

[0071] The above is only a preferred embodiment of the present application, and does not limit the present application in any way. Any simple modification, change and equivalent change made according to the technical essence of the present application to the above embodiment are still within the protection scope of the technical solution of the present application.

Claims

1. A method for producing a high-toughness Mg-Ti composite material, characterized by, The method comprises the following steps: Step one, mixing Mg powder and Ti powder, then carrying out discharge plasma sintering to obtain a sintered composite material; the particle size of the Mg powder and the Ti powder is 45-53 μm, and the mixing mass ratio of the Mg powder and the Ti powder is 8-9:1-2; Step two, loading the sintered composite material obtained in step one into a copper lining pipe with inner wall smeared with lubricating liquid, then carrying out preheating treatment to obtain a preheated copper lining pipe loaded with the sintered composite material; Step three, carrying out multi-pass lining pipe rotary swaging deformation on the preheated copper lining pipe loaded with the sintered composite material obtained in step two to obtain high-strength and high-toughness Mg-Ti composite material with fine grain structure in the copper lining pipe; the tensile strength of the Mg-Ti composite material can be up to 420 MPa, and the elongation can be up to 14.5%; re-preheating treatment is carried out before each pass of the lining pipe rotary swaging deformation.

2. The method of claim 1, wherein the Mg-Ti composite material has a tensile strength of 300 MPa or more and an elongation of 5% or more. In step one, the temperature of the discharge plasma sintering is 450-500 ℃, the time is 20-30 min, and the pressure is 30-150 MPa; the density of the sintered composite material is not less than 99%.

3. The method of claim 1, wherein the Mg-Ti composite material has a tensile strength of 300 MPa or more and an elongation of 5% or more. In step two, the wall thickness of the copper lining pipe is 1-1.5 mm, and the lubricating liquid is composed of graphite and butter with a mass ratio of 1:8-13.

4. The method of claim 1, wherein the Mg-Ti composite material has a tensile strength of 300 MPa or more and an elongation of 5% or more. In step two, the preheating temperature is 380-450 ℃, and the holding time is 15-30 min.

5. The method of claim 1, wherein the Mg-Ti composite material has a tensile strength of 300 MPa or more and an elongation of 5% or more. In step three, the processing pass of the multi-pass lining pipe rotary swaging deformation is 1-5, the deformation amount of the lining pipe rotary swaging is 18-80%, the re-preheating temperature is 350-450 ℃, and the holding time is 10-15 min.

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