Preparation method of high-performance magnesium-titanium composite material

Abstract

The invention discloses a high-performance magnesium-titanium composite material, and a preparation method of the high-performance magnesium-titanium composite material comprises the following steps: 1, stranding a magnesium wire material and a titanium wire material at one time to obtain a grade-I magnesium-titanium composite material; 2, secondarily stranding the grade-I magnesium-titanium composite material to obtain a grade-II magnesium-titanium composite material; 3, stranding the II-grade magnesium-titanium composite material for the third time to obtain a magnesium-titanium preform; 4, cutting the magnesium-titanium preform, and heating and melting the magnesium-titanium preform in a smelting furnace; and fifthly, cooling is conducted, and the magnesium-titanium composite bar is obtained. And sixthly, the magnesium-titanium composite bar is subjected to extrusion deformation, and the high-performance magnesium-titanium composite material with the strength and toughness synergistically improved is obtained. By designing a stranding process and changing a three-dimensional interface combination mode of a magnesium wire and a titanium wire, a compact magnesium-titanium preform in which the magnesium wire and the titanium wire support each other is obtained, primary compounding of the magnesium wire and the titanium wire is realized, and then magnesium and titanium interfaces are well combined through smelting and extrusion deformation, so that the magnesium-titanium composite material is obtained. And the high-performance magnesium-titanium composite material with synergistically improved toughness is obtained.

Description

Technical Field

[0001] The invention belongs to the technical field of magnesium-titanium composite materials, and specifically relates to a method for preparing a high-performance magnesium-titanium composite material. Background Art

[0002] Magnesium and magnesium alloys are widely used in aerospace, transportation, electronic products and other fields due to their low density, high specific strength and specific stiffness, good electrical and thermal conductivity, etc. They are a kind of lightweight material with great development potential. However, the crystal structure characteristics of magnesium alloys themselves lead to low strength and poor plasticity. It is usually necessary to use appropriate process methods to regulate the organizational characteristics and improve the mechanical properties. At present, the comprehensive mechanical properties of magnesium alloys can be improved by alloying, plastic deformation and other methods; however, with the development of modern industry, various industries have put forward higher requirements for magnesium alloy materials. While pursuing lightweight, the relevant performance indicators are also getting higher and higher. Therefore, the development of lightweight magnesium alloy materials with excellent comprehensive performance will broaden its application range.

[0003] The structural characteristics of magnesium alloys make it difficult to meet the growing performance requirements. However, by physically or chemically combining materials of different properties with magnesium alloys, the advantages of different materials can be complemented and the comprehensive mechanical properties of magnesium alloys can be synergistically improved. Titanium and titanium alloys are also a kind of lightweight structural material with excellent performance. They have the characteristics of low density, high specific strength and good fatigue performance. They are widely used in aerospace, biomedicine and other fields. Therefore, magnesium-titanium composites will further improve the comprehensive performance of materials. At present, common magnesium-titanium composite materials include titanium particle reinforced magnesium-based composite materials, titanium fiber reinforced magnesium-based composite materials and magnesium-titanium layered composite materials. However, the particle and fiber reinforcement phases are easy to deposit or aggregate, and the interface bonding quality of the layered composite material is poor, which makes the performance improvement effect unsatisfactory. Therefore, constructing a composite material with uniform distribution of reinforcement and good interface bonding with the matrix is ​​the key to accelerate the further development of magnesium-titanium composite materials. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for preparing a high-performance magnesium-titanium composite material in view of the deficiencies of the above-mentioned prior art. The method changes the three-dimensional interface bonding mode of magnesium wire and titanium wire by designing a twisting process and performing three twistings, thereby obtaining a twisted bundle in which magnesium wire and titanium wire support each other, obtaining a large-sized dense magnesium-titanium preform, realizing the initial compounding of magnesium wire and titanium wire, and then through heating and melting, cooling and extrusion deformation, making the interface of magnesium and titanium well bonded, and obtaining a high-performance magnesium-titanium composite material with synergistic improvement in strength and toughness.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a high-performance magnesium-titanium composite material, characterized in that the magnesium-titanium composite material is obtained by three-dimensionally twisting magnesium wire and titanium wire to construct a magnesium-titanium preform, then heating and melting the magnesium-titanium preform and cooling it to obtain a magnesium-titanium composite rod, and then extruding and deforming the magnesium-titanium composite rod.

[0006] The present invention is based on a magnesium-titanium preform with a three-dimensional interface designed in the early stage, and combines heating and melting and subsequent cooling to prepare a magnesium-titanium composite material, thereby obtaining a magnesium-titanium composite rod with uniform reinforcement distribution and fully combined with the matrix. Thereafter, the magnesium-titanium composite rod is extruded and deformed to obtain a high-strength and toughness magnesium-titanium composite material.

[0007] In addition, the present invention also discloses a method for preparing a high-performance magnesium-titanium composite material, characterized in that the method comprises the following steps:

[0008] Step 1: Twisting magnesium wire and titanium wire at one time, and then placing them in a sizing machine to adjust their external dimensions to obtain a grade I magnesium-titanium composite material; the material of the magnesium wire is magnesium alloy, and the material of the titanium wire is titanium or titanium alloy;

[0009] Step 2: Twisting the grade I magnesium-titanium composite material obtained in step 1 for a second time, and then placing it in a sizing machine to adjust its external dimensions to obtain a grade II magnesium-titanium composite material;

[0010] Step 3, twisting the grade II magnesium-titanium composite material obtained in step 2 three times, and then placing it in a sizing machine to adjust its external dimensions to obtain a grade III magnesium-titanium composite material, i.e., a magnesium-titanium preform;

[0011] Step 4: Cut the magnesium-titanium preform obtained in step 3, and then place it in a graphite crucible, and place an ingot with the same composition as the magnesium wire on the top of the magnesium-titanium preform as a supplement, and then place it in a melting furnace with argon protection to heat, melt and keep warm;

[0012] Step 5: After ensuring that the magnesium wire and the ingot in the magnesium-titanium preform in step 4 are completely melted, the preform is taken out together with the graphite crucible for cooling, and a magnesium-titanium composite rod is obtained in the graphite crucible;

[0013] Step six: extruding and deforming the magnesium-titanium composite rod obtained in step five to obtain a high-performance magnesium-titanium composite material with synergistically improved strength and toughness.

[0014] The present invention changes the three-dimensional interface bonding mode of magnesium wire and titanium wire by designing a twisting process, thereby obtaining a twisted bundle in which the magnesium wire and the titanium wire support each other, and then twists the bundle twice to obtain a large-sized magnesium-titanium preform, thereby realizing the preliminary compounding of the magnesium alloy and the titanium alloy in three-dimensional space, and then melts the magnesium-titanium preform by utilizing the large difference in melting points between magnesium and titanium. During the melting, the melting temperature is higher than the melting point of the magnesium alloy and lower than the melting point of the titanium alloy, and a magnesium ingot is added as a supplement, so that during the heat preservation process, the magnesium fully melts and wraps the titanium and fills the gaps in the wires. In addition, in order to realize the good bonding of the magnesium and titanium interface during the melting process, a suitable magnesium alloy component is selected so that the solute atoms can diffuse into the titanium alloy or react with the titanium alloy after the magnesium alloy is melted, thereby obtaining an interface with good bonding performance, and finally the dense magnesium-titanium composite rod with good interface bonding is extruded and deformed, and the magnesium alloy matrix and the titanium alloy organization mutually influence and synergistically deform due to the different deformation capabilities of the magnesium-titanium alloy, thereby finally obtaining a magnesium-titanium composite material with strong and tough synergistic improvement.

[0015] The invention adjusts the outer dimensions of the steel sheet by placing it in a sizing machine, so that the diameter is more uniform.

[0016] The above method is characterized in that the diameter of the magnesium wire in step 1 is 1 mm to 3 mm, the diameter of the titanium wire is 1 mm to 3 mm, the diameter of the grade I magnesium-titanium composite material in step 1 is 3 mm to 9 mm, the diameter of the grade II magnesium-titanium composite material in step 2 is 9 mm to 27 mm, and the diameter of the grade III magnesium-titanium composite material in step 3 is 27 mm to 81 mm. The present invention controls the diameter of the grade III magnesium-titanium composite material, i.e., the diameter of the magnesium-titanium preform, thereby controlling the size of the magnesium-titanium composite rod and ensuring the performance of the magnesium-titanium composite rod.

[0017] The above method is characterized in that the one-time twisting method in step 1 is that one titanium wire is placed in the center and 3 to 6 magnesium wires are placed around, the magnesium wire tightly wraps the titanium wire, and the angle of twisting the magnesium wire and the titanium wire is 30° to 60°. The present invention controls the one-time twisting method so that the magnesium wire and the titanium wire are tightly and orderly arranged in three-dimensional space, thereby ensuring the performance of the magnesium-titanium composite rod.

[0018] The above method is characterized in that the secondary twisting method in step 2 is that 1 grade I magnesium-titanium composite material is placed in the center and 3 to 6 grade I magnesium-titanium composite materials are placed around, wherein the twisting angle between the grade I magnesium-titanium composite materials around and the grade I magnesium-titanium composite material in the center is 30° to 60°.

[0019] The above method is characterized in that the three twisting methods described in step three are that one grade II magnesium-titanium composite material is placed in the center and 3 to 6 grade II magnesium-titanium composite materials are placed around, wherein the twisting angle between the grade II magnesium-titanium composite materials around and the grade II magnesium-titanium composite material in the center is 30° to 60°.

[0020] The above method is characterized in that the length of the cut in step 4 is 50 mm to 70 mm, and the diameter of the graphite crucible is 30 mm to 90 mm. The present invention ensures the size of the magnesium-titanium composite rod by controlling the cut length, thereby obtaining a high-performance magnesium-titanium composite material of suitable size, and by controlling the size of the graphite crucible, it is convenient to place the preform and the subsequent melting.

[0021] The above method is characterized in that the heating and melting temperature in step 4 is 650°C to 700°C, and the insulation time is 30min to 60min. The present invention controls the heating and melting temperature and time so that the melting temperature during smelting is higher than the melting point of the magnesium alloy and lower than the melting point of the titanium alloy, so that during the insulation process, the magnesium alloy fully melts and wraps the titanium alloy and fills the gaps in the wire.

[0022] The above method is characterized in that the diameter of the magnesium-titanium composite rod in step 5 is 30 mm to 90 mm. The present invention controls the size of the magnesium-titanium composite rod to obtain a high-performance magnesium-titanium composite material of appropriate size.

[0023] The above method is characterized in that the temperature of the extrusion deformation in step 6 is 250°C to 350°C, and the extrusion ratio is 9 to 18. The present invention controls the temperature of the extrusion deformation to be higher than the recrystallization temperature of the magnesium alloy, which is conducive to the continuation of the extrusion deformation. By controlling the extrusion ratio, the high-performance magnesium-titanium composite material is fully extruded.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. The present invention changes the three-dimensional interface bonding mode of magnesium wire and titanium wire by designing a twisting process and performing three twistings, thereby obtaining a twisted bundle in which the magnesium wire and the titanium wire support each other, obtaining a large-sized dense magnesium-titanium preform, achieving preliminary compounding of the magnesium wire and the titanium wire, and then through smelting and subsequent cooling and extrusion deformation, the interface between magnesium and titanium is well bonded, and a high-performance magnesium-titanium composite material with synergistic improvement in strength and toughness is obtained.

[0026] 2. The present invention selects magnesium wire and titanium wire with a large difference in melting points. The melting temperature during smelting is higher than the melting point of the magnesium alloy but lower than the melting point of the titanium alloy, so that the magnesium alloy fully melts and wraps the titanium alloy during the insulation process and fills the gaps in the wires. In addition, in order to achieve good bonding between the interface of the magnesium alloy and the titanium alloy during the smelting process, a suitable magnesium alloy component is selected so that the solute atoms can diffuse into the titanium alloy or react with the titanium alloy after the magnesium alloy is melted, thereby obtaining an interface with good bonding performance.

[0027] 3. The present invention extrude and deform a dense magnesium-titanium composite rod with good interface bonding. Due to the different deformation capabilities of magnesium and titanium, the magnesium matrix and the titanium structure mutually influence each other and deform synergistically, and finally obtain a magnesium-titanium composite material with synergistic improvement in strength and toughness.

[0028] 4. The present invention has novel design concept and simple process, and can easily realize the effective preparation of high-performance magnesium-titanium composite materials.

[0029] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the Grade I magnesium-titanium composite material obtained in the present invention.

[0031] Figure 2 It is a schematic diagram of the cross section of the Grade I magnesium-titanium composite material obtained in the present invention.

[0032] Figure 3 It is a schematic diagram of the grade II magnesium-titanium composite material obtained by the present invention.

[0033] Figure 4 It is a schematic diagram of the cross section of the grade II magnesium-titanium composite material obtained in the present invention.

[0034] Figure 5 It is a schematic diagram of the grade III magnesium-titanium composite material obtained by the present invention.

[0035] Figure 6 It is a schematic diagram of the cross section of the grade III magnesium-titanium composite material obtained in the present invention.

[0036] Figure 7 It is a schematic diagram of the cross section of the magnesium-titanium composite rod obtained in the present invention.

[0037] Figure 8 This is a SEM image of the cross section of the magnesium-titanium composite rod obtained in Example 1 of the present invention.

[0038] Fig. 9 This is a SEM image of the cross section of the high-performance magnesium-titanium composite material obtained in Example 1 of the present invention.

[0039] Fig.10This is a metallographic image of the cross section of the high-performance magnesium-titanium composite material obtained in Example 1 of the present invention.

[0040] Fig.11 Graph showing the compressive stress-strain curves of the magnesium-titanium composite rod and the high-performance magnesium-titanium composite material obtained in Example 1 of the present invention. DETAILED DESCRIPTION

[0041] Figure 1 is a schematic diagram of the Grade I magnesium-titanium composite material obtained in the present invention, Figure 2 is a schematic diagram of the cross section of the grade I magnesium-titanium composite material obtained in the present invention, from Figure 1 and Figure 2 It can be seen that the titanium wire is in the middle of the grade I magnesium-titanium composite material, and the magnesium wire is placed around the titanium wire and tightly wrapped. The titanium wire and the magnesium wire are arranged tightly and orderly in space and interlocked in three dimensions.

[0042] Figure 3 is a schematic diagram of the grade II magnesium-titanium composite material obtained in the present invention, Figure 4 is a schematic diagram of the cross section of the grade II magnesium-titanium composite material obtained in the present invention, from Figure 3 and Figure 4 It can be seen that the spatial arrangement of the grade II magnesium-titanium composite material is more compact and orderly after secondary twisting.

[0043] Figure 5 is a schematic diagram of the grade III magnesium-titanium composite material obtained in the present invention, Figure 6 is a schematic diagram of the cross section of the grade III magnesium-titanium composite material obtained in the present invention, from Figure 5 and Figure 6 It can be seen that the titanium wires and magnesium wires in the grade III magnesium-titanium composite material are arranged alternately and orderly in three-dimensional space and are interrelated and restricted to each other.

[0044] Figure 7 is a schematic diagram of the cross section of the magnesium-titanium composite rod obtained in the present invention, from Figure 7 It can be seen that the titanium wire in the magnesium-titanium composite rod is evenly distributed in the magnesium and the interface bonding is good.

[0045] Example 1

[0046] This embodiment includes the following steps:

[0047] Step 1: Twist 6 AZ31 magnesium wires with a diameter of 1 mm and 1 TA1 titanium wire with a diameter of 1 mm at one time, wherein the TA1 titanium wire is placed in the center and the AZ31 magnesium wire is placed around, the twisting angle of the AZ31 magnesium wire and the TA1 titanium wire is 45°, the AZ31 magnesium wire tightly wraps the TA1 titanium wire, and then places it in a sizing machine to adjust its external dimensions to obtain a dense Grade I magnesium-titanium composite material with an outer diameter of 3 mm;

[0048] Step 2: Twisting the seven Grade I magnesium-titanium composite materials obtained in Step 1 for a second time, wherein one Grade I magnesium-titanium composite material is placed in the center and six Grade I magnesium-titanium composite materials are placed around, and the Grade I magnesium-titanium composite materials around the center are twisted at an angle of 45°, and then placed in a sizing machine to adjust its external dimensions to obtain a dense Grade II magnesium-titanium composite material with an outer diameter of 9 mm;

[0049] Step 3, twisting the 7 grade II magnesium-titanium composite materials obtained in step 2 three times, wherein 1 grade II magnesium-titanium composite material is placed in the center and 6 grade II magnesium-titanium composite materials are placed around, and the grade II magnesium-titanium composite materials around the twisting angle with the grade II magnesium-titanium composite material in the center are 45°, and then placed in a sizing machine to adjust its external dimensions to obtain a dense grade III magnesium-titanium composite material, i.e., a magnesium-titanium preform, whose outer diameter is 27 mm;

[0050] Step 4: Cut the magnesium-titanium preform obtained in step 3 into a length of 65 mm, and then place it in a graphite crucible with an inner diameter of 30 mm, and place an AZ31 ingot on the top of the magnesium-titanium preform as a supplement, and then place the graphite crucible in a melting furnace protected by argon gas and heat it to melt at a temperature of 680° C. for 60 min;

[0051] Step 5: After ensuring that the magnesium wire and the ingot in the magnesium-titanium preform in step 4 are completely melted, the preform is taken out together with the graphite crucible for cooling, and a dense magnesium-titanium composite rod with a diameter of 30 mm is obtained in the graphite crucible;

[0052] Step 6: The magnesium-titanium composite rod obtained in step 5 is extruded and deformed at an extrusion ratio of 18 and an extrusion temperature of 300° C. to obtain a high-performance magnesium-titanium composite material with synergistic improvement in strength and toughness and a diameter of 7 mm.

[0053] After testing, it was found that in the high-performance magnesium-titanium composite material with synergistic improvement in strength and toughness prepared in this embodiment, the magnesium-titanium interface was well meshed and bonded with each other, the magnesium matrix grains were significantly refined, and the compression performance was significantly improved, achieving synergistic improvement in strength and toughness.

[0054] Figure 8 This is a SEM image of the cross section of the magnesium-titanium composite rod obtained in Example 1 of the present invention. Figure 8 It can be seen that the magnesium wire is completely melted and wraps the titanium wire with good interface bonding.

[0055] Fig. 9 The SEM image of the cross section of the high performance magnesium-titanium composite material obtained in Example 1 of the present invention is shown in FIG. Fig. 9 It can be seen that after extrusion, the titanium wire undergoes obvious plastic deformation and its diameter becomes smaller. Its surface is no longer smooth and round but serrated and meshes with the magnesium alloy.

[0056] Fig.10is a metallographic image of the cross section of the high performance magnesium-titanium composite material obtained in Example 1 of the present invention. Fig.10 It can be seen that the magnesium-titanium interface is well meshed and bonded with each other, and the magnesium matrix grains are significantly refined.

[0057] Fig.11 is the compressive stress-strain curve of the magnesium-titanium composite rod and the high-performance magnesium-titanium composite material obtained in Example 1 of the present invention, Fig.11 It can be seen that the compression performance of high-performance magnesium-titanium composite materials has been significantly improved, achieving synergistic improvement in strength and toughness.

[0058] Example 2

[0059] This embodiment includes the following steps:

[0060] Step 1: Twist 6 AZ31 magnesium wires with a diameter of 1 mm and 1 TA1 titanium wire with a diameter of 1 mm at one time, wherein the TA1 titanium wire is placed in the center and the AZ31 magnesium wire is placed around, the twisting angle of the AZ31 magnesium wire and the TA1 titanium wire is 30°, the AZ31 magnesium wire tightly wraps the TA1 titanium wire, and then places it in a sizing machine to adjust its external dimensions to obtain a dense Grade I magnesium-titanium composite material with an outer diameter of 3 mm;

[0061] Step 2: Twisting the seven Grade I magnesium-titanium composite materials obtained in Step 1 for a second time, wherein one Grade I magnesium-titanium composite material is placed in the center and six Grade I magnesium-titanium composite materials are placed around, and the twisting angle between the Grade I magnesium-titanium composite materials around and the Grade I magnesium-titanium composite materials in the center is 30°, and then placing the materials in a sizing machine to adjust their external dimensions to obtain a dense Grade II magnesium-titanium composite material having an outer diameter of 9 mm;

[0062] Step 3, twisting the 7 grade II magnesium-titanium composite materials obtained in step 2 three times, wherein 1 grade II magnesium-titanium composite material is placed in the center and 6 grade II magnesium-titanium composite materials are placed around, and the twisting angle between the grade II magnesium-titanium composite materials around and the grade II magnesium-titanium composite materials in the center is 30°, and then placing it in a sizing machine to adjust its external dimensions to obtain a dense grade III magnesium-titanium composite material, i.e., a magnesium-titanium preform, whose outer diameter is 27 mm;

[0063] Step 4: Cut the magnesium-titanium preform obtained in step 3 into a length of 65 mm, and then place it in a graphite crucible with an inner diameter of 30 mm, and place an AZ31 ingot on the top of the magnesium-titanium preform as a supplement, and then place the graphite crucible in a melting furnace protected by argon gas and heat it to melt at a temperature of 680° C. for 60 min;

[0064] Step 5: After ensuring that the magnesium wire and the ingot in the magnesium-titanium preform in step 4 are completely melted, the preform is taken out together with the graphite crucible for cooling, and a dense magnesium-titanium composite rod with a diameter of 30 mm is obtained in the graphite crucible;

[0065] Step 6: The magnesium-titanium composite rod obtained in step 5 is extruded and deformed at an extrusion ratio of 9 and an extrusion temperature of 300° C. to obtain a high-performance magnesium-titanium composite material with synergistic improvement in strength and toughness and a diameter of 10 mm.

[0066] After testing, it was found that in the high-performance magnesium-titanium composite material with synergistic improvement in strength and toughness prepared in this embodiment, the magnesium-titanium interface was well meshed and bonded with each other, the magnesium matrix grains were significantly refined, and the compression performance was significantly improved, achieving synergistic improvement in strength and toughness.

[0067] Example 3

[0068] This embodiment includes the following steps:

[0069] Step 1: Twisting three AZ80 magnesium wires with a diameter of 2 mm and one TC4 wire with a diameter of 2 mm at one time, wherein the TC4 titanium wire is placed in the center and the AZ80 magnesium wire is placed around, the twisting angle of the AZ80 magnesium wire and the TC4 titanium wire is 60°, the AZ80 magnesium wire tightly wraps the TC4 titanium wire, and then placed in a sizing machine to adjust its external dimensions, to obtain a dense Grade I magnesium-titanium composite material with an outer diameter of 6 mm;

[0070] Step 2: Twisting the four Grade I magnesium-titanium composite materials obtained in Step 1 for a second time, wherein one Grade I magnesium-titanium composite material is placed in the center and three Grade I magnesium-titanium composite materials are placed around, and the twisting angle between the Grade I magnesium-titanium composite materials around and the Grade I magnesium-titanium composite material in the center is 60°, and then placing it in a sizing machine to adjust its external dimensions to obtain a dense Grade II magnesium-titanium composite material with an outer diameter of 18 mm;

[0071] Step 3, twisting the four grade II magnesium-titanium composite materials obtained in step 2 three times, wherein one grade II magnesium-titanium composite material is placed in the center and three grade II magnesium-titanium composite materials are placed around, and the twisting angle between the grade II magnesium-titanium composite materials around and the grade II magnesium-titanium composite material in the center is 60°, and then placing them in a sizing machine to adjust their external dimensions to obtain a dense grade III magnesium-titanium composite material, i.e., a magnesium-titanium preform, whose outer diameter is 54 mm;

[0072] Step 4: Cut the magnesium-titanium preform obtained in step 3 into a length of 50 mm, and then place it in a graphite crucible with an inner diameter of 60 mm, and place an AZ80 ingot on the top of the magnesium-titanium preform as a supplement, and then place the graphite crucible in a melting furnace protected by argon gas and heat it to melt at a temperature of 700°C for 50 minutes;

[0073] Step 5: After ensuring that the magnesium wire and the ingot in the magnesium-titanium preform in step 4 are completely melted, the preform is taken out together with the graphite crucible for cooling, and a dense magnesium-titanium composite rod with a diameter of 60 mm is obtained in the graphite crucible;

[0074] Step 6: The magnesium-titanium composite rod obtained in step 5 is extruded and deformed at an extrusion ratio of 12 and an extrusion temperature of 300° C. to obtain a high-performance magnesium-titanium composite material with a diameter of 9 mm and synergistically improved strength and toughness.

[0075] After testing, it was found that in the high-performance magnesium-titanium composite material with synergistic improvement in strength and toughness prepared in this embodiment, the magnesium-titanium interface was well meshed and bonded with each other, the magnesium matrix grains were significantly refined, and the compression performance was significantly improved, achieving synergistic improvement in strength and toughness.

[0076] Example 4

[0077] This embodiment includes the following steps:

[0078] Step 1: twist 6 ZK61 magnesium wires with a diameter of 3 mm and 1 TA1 titanium wire with a diameter of 3 mm, wherein the TA1 titanium wire is placed in the center and the ZK61 magnesium wire is placed around, the twisting angle of the ZK61 magnesium wire and the TA1 titanium wire is 40°, the ZK61 magnesium wire tightly wraps the TA1 titanium wire, and then places it in a sizing machine to adjust its external dimensions to obtain a dense Grade I magnesium-titanium composite material with an outer diameter of 9 mm;

[0079] Step 2: Twisting the seven Grade I magnesium-titanium composite materials obtained in Step 1 for a second time, wherein one Grade I magnesium-titanium composite material is placed in the center and six Grade I magnesium-titanium composite materials are placed around, and the twisting angle between the Grade I magnesium-titanium composite materials around and the Grade I magnesium-titanium composite materials in the center is 40°, and then placing them in a sizing machine to adjust their external dimensions to obtain a dense Grade II magnesium-titanium composite material with an outer diameter of 27 mm;

[0080] Step 3, twisting the 7 grade II magnesium-titanium composite materials obtained in step 2 three times, wherein 1 grade II magnesium-titanium composite material is placed in the center and 6 grade II magnesium-titanium composite materials are placed around, and the twisting angle of the grade II magnesium-titanium composite materials around and the grade II magnesium-titanium composite materials in the center is 40°, and then placing it in a sizing machine to adjust its external dimensions to obtain a dense grade III magnesium-titanium composite material, i.e., a magnesium-titanium preform, whose outer diameter is 81 mm;

[0081] Step 4: Cut the magnesium-titanium preform obtained in step 3 into a length of 70 mm, and then place it in a graphite crucible with an inner diameter of 90 mm, and place a ZK61 ingot on the top of the magnesium-titanium preform as a supplement, and then place the graphite crucible in a melting furnace protected by argon gas and heat it to melt at a temperature of 650°C for 30 minutes;

[0082] Step 5: After ensuring that the magnesium wire and the ingot in the magnesium-titanium preform in step 4 are completely melted, the preform is taken out together with the graphite crucible for cooling, and a dense magnesium-titanium composite rod with a diameter of 90 mm is obtained in the graphite crucible;

[0083] Step 6: The magnesium-titanium composite rod obtained in step 5 is extruded and deformed at an extrusion ratio of 15 and an extrusion temperature of 300° C. to obtain a high-performance magnesium-titanium composite material with a diameter of 12 mm and synergistically improved strength and toughness.

[0084] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent change made to the above embodiment according to the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A high-performance magnesium-titanium composite material, characterized in that: The magnesium-titanium composite material is obtained by three-dimensionally twisting magnesium wires and titanium wires to construct a magnesium-titanium preform, then heating and melting the magnesium-titanium preform and cooling it to obtain a magnesium-titanium composite rod, and then extruding and deforming the magnesium-titanium composite rod.

2. A method for preparing the high-performance magnesium-titanium composite material as claimed in claim 1, characterized in that: The method comprises the following steps: Step 1: Twisting magnesium wire and titanium wire at one time, and then placing them in a sizing machine to adjust their external dimensions to obtain a grade I magnesium-titanium composite material; the material of the magnesium wire is magnesium alloy, and the material of the titanium wire is titanium or titanium alloy; Step 2: Twisting the grade I magnesium-titanium composite material obtained in step 1 for a second time, and then placing it in a sizing machine to adjust its external dimensions to obtain a grade II magnesium-titanium composite material; Step 3, twisting the grade II magnesium-titanium composite material obtained in step 2 three times, and then placing it in a sizing machine to adjust its external dimensions to obtain a grade III magnesium-titanium composite material, i.e., a magnesium-titanium preform; Step 4: Cut the magnesium-titanium preform obtained in step 3, and then place it in a graphite crucible, and place an ingot with the same composition as the magnesium wire on the top of the magnesium-titanium preform as a supplement, and then place it in a melting furnace with argon protection to heat, melt and keep warm; Step 5: After ensuring that the magnesium wire and the ingot in the magnesium-titanium preform in step 4 are completely melted, the preform is taken out together with the graphite crucible for cooling, and a magnesium-titanium composite rod is obtained in the graphite crucible; Step six: extruding and deforming the magnesium-titanium composite rod obtained in step five to obtain a high-performance magnesium-titanium composite material with synergistically improved strength and toughness.

3. The method according to claim 2, characterized in that The diameter of the magnesium wire in step one is 1mm to 3mm, the diameter of the titanium wire is 1mm to 3mm, the diameter of the grade I magnesium-titanium composite material in step one is 3mm to 9mm, the diameter of the grade II magnesium-titanium composite material in step two is 9mm to 27mm, and the diameter of the grade III magnesium-titanium composite material in step three is 27mm to 81mm.

4. The method according to claim 2, characterized in that: The one-time twisting method in step 1 is that 1 titanium wire is placed in the center and 3 to 6 magnesium wires are placed around it, the magnesium wire tightly wraps the titanium wire, and the twisting angle of the magnesium wire and the titanium wire is 30° to 60°.

5. The method according to claim 2, characterized in that: The secondary twisting method described in step 2 is that 1 grade I magnesium-titanium composite material is placed in the center and 3 to 6 grade I magnesium-titanium composite materials are placed around, wherein the twisting angle between the grade I magnesium-titanium composite materials around and the grade I magnesium-titanium composite materials in the center is 30° to 60°.

6. The method according to claim 2, characterized in that The three-twisting method described in step three is that 1 grade II magnesium-titanium composite material is placed in the center and 3 to 6 grade II magnesium-titanium composite materials are placed around, wherein the angle between the grade II magnesium-titanium composite materials around and the grade II magnesium-titanium composite materials in the center is 30° to 60°.

7. The method according to claim 2, characterized in that: The length of the cut in step 4 is 50 mm to 70 mm, and the diameter of the graphite crucible is 30 mm to 90 mm.

8. The method according to claim 2, characterized in that: The heating and melting temperature in step 4 is 650° C. to 700° C., and the insulation time is 30 min to 60 min.

9. The method according to claim 2, characterized in that: The diameter of the magnesium-titanium composite rod in step five is 30 mm to 90 mm.

10. The method according to claim 2, characterized in that The temperature of the extrusion deformation in step six is ​​250° C. to 350° C., and the extrusion ratio is 9 to 18.

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