Preparation method of high-toughness titanium alloy frame reinforced magnesium-based composite material

Abstract

The application belongs to the field of metal composite materials, and specifically discloses a preparation method of high-strength and high-toughness titanium alloy frame reinforced magnesium-based composite material, which comprises the following steps: arranging and fixing titanium alloy wires in a mold to obtain a titanium alloy frame; then injecting magnesium alloy into the titanium alloy frame, and then performing vibration and compression molding to obtain a composite material blank; and sintering the composite material blank to obtain the magnesium-based composite material. The magnesium-based composite material prepared by the preparation method has a titanium alloy frame for reinforcement, the titanium alloy frame and the magnesium alloy have a good bonding interface, the magnesium-based composite material has high mechanical properties and low density, and specifically, the yield strength is greater than or equal to 500 MPa, the tensile strength is greater than or equal to 500 MPa, the elastic modulus is greater than or equal to 80 GPa, and the density is less than or equal to 3.2 g / cm 3 , thereby significantly solving the problem of poor strength of the existing magnesium alloy.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of metal composite materials, and particularly relates to a preparation method of high-strength and high-toughness titanium alloy frame reinforced magnesium-based composite material. BACKGROUND

[0002] As a new generation of lightweight structural material, magnesium-based composite material has been widely concerned in the field of engineering application. It gradually becomes the most potential light metal material after steel and aluminum alloy due to its lightweight, high specific stiffness, high specific strength and abundant resources.

[0003] Metal magnesium is expected to become a new generation of aerospace and military equipment material due to its small density, excellent comprehensive mechanical properties and abundant reserves. However, its poor strength and plasticity hinder its wide application in related fields. Therefore, it is particularly important to prepare magnesium-based composite material with high strength and toughness. SUMMARY

[0004] In order to overcome at least one technical problem existing in the prior art, one of the purposes of the present application is to provide a magnesium-based composite material.

[0005] The second purpose of the present application is to provide a preparation method of magnesium-based composite material.

[0006] The third purpose of the present application is to provide the application of the above-mentioned magnesium-based composite material in the field of transportation equipment, ocean engineering equipment, building materials or electronic equipment.

[0007] In order to achieve the above-mentioned purposes, the technical solution adopted by the present application is as follows:

[0008] The first aspect of the present application provides a magnesium-based composite material, which comprises the following volume percentages of raw materials: titanium alloy frame 45-50%; magnesium alloy 50-55%; the titanium alloy frame is composed of at least two titanium alloy wires arranged.

[0009] The present application controls the density of magnesium-based composite material by limiting the content of titanium alloy frame and ensuring the volume percentage of magnesium alloy.

[0010] In some embodiments of the present application, the volume percentage of titanium alloy frame is selected from any one value or a range value formed by any two values selected from 45%, 45.5%, 46%, 46.5%, 47%, 47.5%, 48%, 48.5%, 49%, 49.5% and 50%.

[0011] In some embodiments of the present application, the volume percentage of the magnesium alloy is selected from any one of 50%, 50.5%, 51%, 51.5%, 52%, 52.5%, 53%, 53.5%, 54%, 54.5%, 55% or a range value formed by any two of them.

[0012] In some embodiments of the present application, the distance between the two adjacent titanium alloy wires is 0.75-5mm; in some embodiments of the present application, the distance between the two adjacent titanium alloy wires is any one of 0.75mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm or a range value formed by any two of them.

[0013] In some embodiments of the present application, the arrangement is selected from at least one of the following: unidirectional parallel arrangement, orthogonal laminated arrangement, oblique arrangement, braided structure arrangement. The titanium alloy wires can be arranged in at least one of the following: unidirectional parallel arrangement, orthogonal laminated arrangement, oblique arrangement, braided structure arrangement to form a titanium alloy frame.

[0014] In some embodiments of the present application, the diameter of the titanium alloy wire is 0.5-3.5mm; in some embodiments of the present application, the diameter of the titanium alloy wire is any one of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm or a range value formed by any two of them. The diameter of the titanium alloy wire is designed to meet the sintering requirements of the titanium alloy frame. If the titanium alloy wire is too thin, the interface reaction during sintering will cause the titanium alloy wire to disappear and cannot provide strength. If the titanium alloy wire is too thick, cracks are likely to occur after sintering, the interface bonding strength is poor, and the strength of the magnesium-based composite material is affected.

[0015] In some embodiments of the present application, the material of the titanium alloy wire is selected from at least one of TC4, TC6, TC11, Ti1023, TA12, TA7, TA11.

[0016] In some embodiments of the present application, the magnesium alloy includes at least one of Mg-Al alloy, Mg-Zn alloy, Mg-Mn alloy, Mg-RE alloy.

[0017] In some embodiments of the present application, the Mg-Al alloy includes at least one of AZ91D alloy, AZ31 alloy, AZ61 alloy, AM50 alloy, AM60 alloy, AE42 alloy.

[0018] In some embodiments of the present application, the Mg-Zn alloy includes at least one of ZK60 alloy, ZK30 alloy, ZE41 alloy, ZE63 alloy, Mg-Zn-Ca alloy, Mg-Zn-Y alloy.

[0019] In some embodiments of the present application, the Mg-Mn alloy includes at least one of M1A alloy, M2M alloy, ME20M alloy, Mg-Mn-Ca alloy, Mg-Mn-Zr alloy.

[0020] In some embodiments of the present application, the Mg-RE alloy (RE refers to rare earth elements) includes at least one of WE43 alloy, WE54 alloy, EK60 alloy, Mg-Zn-Zr alloy, Mg-Y-Nd-Zr alloy.

[0021] In some embodiments of the present application, the particle size of the magnesium alloy is 10-100 μm; in some embodiments of the present application, the particle size of the magnesium alloy is any one of 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm or a range value formed by any two of them. The particle size of the magnesium alloy powder is too small, the oxidation of the powder is intensified, the sintering process is seriously ablated, and the safety is poor when filling the powder, and the powder is easily burned.

[0022] In some embodiments of the present application, the magnesium alloy is spherical or spheroidal. The sphericity is to provide the flowability of the magnesium alloy powder, to more easily fill the pore position of the titanium alloy frame, and to increase the density of the titanium alloy frame.

[0023] In some embodiments of the present application, the yield strength of the magnesium-based alloy material is ≥500 MPa; in some embodiments of the present application, the yield strength of the magnesium-based alloy material is 510-530 MPa.

[0024] In some embodiments of the present application, the tensile strength of the magnesium-based alloy material is ≥500 MPa; in some embodiments of the present application, the tensile strength of the magnesium-based alloy material is 540-580 MPa.

[0025] In some embodiments of the present application, the elastic modulus of the magnesium-based alloy material is ≥80 GPa.

[0026] In some embodiments of the present application, the density of the magnesium-based alloy material is ≤ 3.2 g / cm 3 .

[0027] A second aspect of the present application provides a method for preparing the magnesium-based composite material of the first aspect of the present application, comprising the following steps:

[0028] arranging and fixing titanium alloy wires in a mold to obtain a titanium alloy frame;

[0029] Then injecting magnesium alloy into the titanium alloy frame, and vibration-pressing to obtain a composite material blank;

[0030] sintering the composite material blank to obtain the magnesium-based composite material.

[0031] In some embodiments of the present application, the step of arranging and fixing titanium alloy wires in a mold is specifically inserting the titanium alloy wires into an array of round holes arranged in the mold to form a titanium alloy frame in the mold.

[0032] The present application controls the shape of the titanium alloy frame by using a mold to fix the position of the titanium alloy wires, and then provides an environment for the magnesium alloy powder to fill into the titanium alloy frame, cold-pressing and sintering densification.

[0033] In some embodiments of the present application, the array of round holes is arranged by round holes with a hole diameter of 0.5-3.5 mm at a hole spacing of 0.75-5 mm.

[0034] In some embodiments of the present application, the top of the mold is provided with a feeding hole with a hole diameter of 30-50 mm. The magnesium alloy is added into the titanium alloy frame through the feeding hole.

[0035] In some embodiments of the present application, the titanium alloy wires are treated with ethanol with a concentration of 50-95%. After treatment with ethanol, the impurity elements on the surface of the titanium alloy can be removed, the influence of impurity elements on the interfacial bonding strength can be reduced, and the mechanical properties of the magnesium-based composite material can be improved.

[0036] In some embodiments of the present application, the pressure of the press forming is 100-180 MPa; in some embodiments of the present application, the pressure of the press forming is any one value or a range value formed by any two values selected from 100 MPa, 105 MPa, 110 MPa, 115 MPa, 120 MPa, 125 MPa, 130 MPa, 135 MPa, 140 MPa, 145 MPa, 150 MPa, 155 MPa, 160 MPa, 165 MPa, 170 MPa, 175 MPa, and 180 MPa.

[0037] In some embodiments of the present application, the pressing forming has a pressure increasing rate of 1-10 MPa / s; in some embodiments of the present application, the pressing forming has a pressure increasing rate of any one of 1 MPa / s, 2 MPa / s, 3 MPa / s, 4 MPa / s, 5 MPa / s, 6 MPa / s, 7 MPa / s, 8 MPa / s, 9 MPa / s, 10 MPa / s or a range value formed by any two of them.

[0038] In some embodiments of the present application, the pressing forming has a pressure holding time of 1-30 min; in some embodiments of the present application, the pressing forming has a pressure holding time of any one of 1 min, 2 min, 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, 9 min, 10 min, 11 min, 12 min, 13 min, 14 min, 15 min, 16 min, 17 min, 18 min, 19 min, 20 min, 21 min, 22 min, 23 min, 24 min, 25 min, 26 min, 27 min, 28 min, 29 min, 30 min or a range value formed by any two of them.

[0039] In some embodiments of the present application, the pressing forming is performed by vertical cold pressing.

[0040] The purpose of the pressing of the composite material blank in the present application is to increase the density of the magnesium-based composite material, reduce the sintering temperature, increase the interface bonding strength, discharge air to reduce sintering porosity and control the sintering shape.

[0041] In some embodiments of the present application, the vibration has a frequency of 25-100 HZ; in some embodiments of the present application, the vibration has a frequency of any one of 25 HZ, 27 HZ, 30 HZ, 32 HZ, 35 HZ, 37 HZ, 40 HZ, 42 HZ, 45 HZ, 47 HZ, 50 HZ, 52 HZ, 55 HZ, 57 HZ, 60 HZ, 62 HZ, 65 HZ, 67 HZ, 70 HZ, 72 HZ, 75 HZ, 77 HZ, 80 HZ, 82 HZ, 85 HZ, 87 HZ, 90 HZ, 92 HZ, 95 HZ, 97 HZ, 100 HZ or a range value formed by any two of them. The vibration of the mold is to improve the density of the magnesium alloy powder filling, discharge air and reduce sintering defects.

[0042] In some embodiments of the present application, the vibration direction is vertical.

[0043] In some embodiments of the present application, the step of sintering the composite material blank is to place the composite material blank into a sintering furnace, vacuumize for 1-5 times and then fill with inert gas for sintering.

[0044] In some embodiments of the present application, the step of vacuumizing is vacuumizing to a vacuum degree ≤ 2*10 -3 MPa, filling inert gas to normal pressure, and then continuing vacuumizing, repeating the vacuumizing process 1-5 times.

[0045] In some embodiments of the present application, the sintering pressure is 500-1000 Pa; in some embodiments of the present application, the sintering pressure is any one of 500 Pa, 550 Pa, 600 Pa, 650 Pa, 700 Pa, 750 Pa, 800 Pa, 850 Pa, 900 Pa, 950 Pa, 1000 Pa or a range value formed by any two of them. In the sintering step, the present application fills inert gas to make the pressure of inert gas reach 500-1000 Pa, and sintering is carried out at this pressure.

[0046] In some embodiments of the present application, the sintering atmosphere is inert atmosphere.

[0047] In some embodiments of the present application, the sintering is first heating to 780-850℃ for 0.5-1 h, and then cooling to 730-770℃ for 1.5-2 h. In the present application, sintering is first carried out at 780-850℃, mainly to completely liquefy the magnesium alloy, and at the same time to regulate the temperature threshold of the interface to form TiAl3 interfacial compound, so as to promote the formation of interfacial compound TiAl3 at the interface; and then sintering at 730-770℃ is to inhibit the volatilization of magnesium alloy and reduce the formation of magnesium vapor, and at the same time, this temperature is a reasonable annealing temperature for titanium alloy, which can improve the strength of the prepared magnesium-based composite material.

[0048] In the present application, by controlling the sintering temperature, sintering procedure and sintering atmosphere during sintering, the interface strength and density of the composite material after sintering are improved, thereby significantly improving the strength of the magnesium-based composite material. The strength of the framework reinforced magnesium-based composite material is mainly determined by the framework material, and a stronger framework material will lead to a significant improvement in the performance of the prepared framework reinforced magnesium-based composite material.

[0049] In some embodiments of the present application, the temperature of heating is 780-850℃, for example, it can be selected from any one of 780℃, 790℃, 800℃, 810℃, 820℃, 830℃, 840℃, 850℃ or a range value formed by any two of them.

[0050] In some embodiments of the present application, the temperature of cooling is 730-770℃, for example, it can be selected from any one of 730℃, 735℃, 740℃, 745℃, 750℃, 755℃, 760℃, 765℃, 770℃ or a range value formed by any two of them.

[0051] In some embodiments of the present application, the heating rate of the sintering is 5-15℃ / min; in some embodiments of the present application, the heating rate of the sintering is any one of 5℃ / min, 6℃ / min, 7℃ / min, 8℃ / min, 9℃ / min, 10℃ / min, 11℃ / min, 12℃ / min, 13℃ / min, 14℃ / min, 15℃ / min or a range value formed by any two of them.

[0052] In some embodiments of the present application, the method for preparing the magnesium-based composite material comprises the following steps:

[0053] The titanium alloy wire is arranged and fixed in a mold to obtain a titanium alloy frame;

[0054] Then, the magnesium alloy is injected into the titanium alloy frame, vertical vibration is carried out under a vibration frequency of 25-100HZ, and then the pressure is increased to 100-180MPa at a pressure increasing rate of 1-5MPa / s for 3-10min to obtain a composite material blank;

[0055] The composite material blank is placed into a sintering furnace, vacuum is drawn to make the vacuum degree ≤2*10 -3 MPa is stopped, inert gas is filled to normal pressure, vacuum is repeatedly drawn for 1-5 times, then inert gas is filled to a pressure of 500-1000Pa, the temperature is increased to 780-850℃ at a heating rate of 5-15℃ / min for 0.5-1h, then the temperature is decreased to 730-770℃ for 1.5-2h, and natural cooling is carried out to obtain the magnesium-based composite material.

[0056] The repeated vacuum drawing in the present application is to reduce the oxygen content of the sintering environment and reduce oxidation, the 500-1000Pa inert gas environment is to inhibit the volatilization behavior in the sintering process of the magnesium alloy, increase the material yield, the design of the heating temperature and the holding time after heating is to increase the interfacial bonding strength and the density, and the cooling temperature and the holding time after cooling is to heat treat the titanium alloy frame in the furnace and improve the strength of the prepared magnesium-based composite material.

[0057] The third aspect of the present application provides the application of the magnesium-based composite material in the first aspect of the present application in the field of transportation equipment, ocean engineering equipment, building materials or electronic equipment.

[0058] The magnesium-based composite material in the present application is reinforced by a titanium alloy frame, the titanium alloy frame has a good bonding interface with the magnesium alloy, so that the prepared magnesium-based composite material has high mechanical properties and low density, specifically: yield strength ≥500MPa, tensile strength ≥500MPa, elastic modulus ≥80GPa, and density ≤3.2g / cm3 This significantly solves the problem of poor strength in existing magnesium alloys.

[0059] The preparation method of this invention involves constructing a titanium alloy framework, filling magnesium alloy powder into the titanium alloy framework, and then controlling the sintering parameters to prepare a high-strength, low-density, and dense magnesium-based composite material. This preparation method is simple, easy to operate, and does not require high-end equipment, making it suitable for mass industrial production. Attached Figure Description

[0060] Figure 1 This is a schematic diagram of the mold used in an embodiment of the present invention.

[0061] Figure 2 This is a SEM image of the magnesium-based composite material prepared in Example 1.

[0062] Figure 3 This is a SEM image of the fracture surface of the magnesium-based composite material prepared in Example 1.

[0063] Figure 4 This is a high-magnification scanning electron microscope image of a local location of the fracture surface of the magnesium-based composite material prepared in Example 1.

[0064] Figure 5 The stress-strain curves are for the magnesium-based composite materials prepared in Examples 1 and 2.

[0065] Figure 6 The stress-strain curves of the magnesium-based composite materials prepared in Example 1 and Comparative Example 1 are shown. Detailed Implementation

[0066] The specific implementation of the present invention will be further described in detail below with reference to the accompanying drawings and examples, but the implementation and protection of the present invention are not limited thereto. It should be noted that any processes not specifically described in detail below are those that can be implemented or understood by those skilled in the art by referring to the prior art. Reagents or instruments used without specified manufacturers are all conventional products that can be purchased commercially.

[0067] like Figure 1 As shown in the structural diagram, the internal dimensions of the mold used in the following embodiments are 300mm*200mm*100mm. The mold has a uniformly arranged array of through holes with a diameter of 3.5mm and a spacing of 5mm. A feeding hole with a diameter of 50mm is provided on the top surface of the mold.

[0068] Example 1

[0069] This example provides a method for preparing a high-strength and tough TC4 wire framework reinforced magnesium-based composite material, specifically including the following steps:

[0070] 1. Material preparation: The composite material uses TC4 wire with purity ≥ 99.99% and diameter of 3.0 mm, and spherical AZ91 powder with purity ≥ 99.99% and particle size of 100 μm.

[0071] Prepare raw materials according to the volume percentage of TC4 wire being 45% and the volume percentage of spherical AZ91 powder being 55%;

[0072] 2. Surface treatment: immerse the TC4 wire in an ethanol solution with a concentration of 95% for 10 min to remove surface impurity elements, then clean and dry.

[0073] 3. Filling: insert the dried TC4 wire into the through-hole array of the mold in Figure 1 and then fix it in the mold, add spherical AZ91 powder from the charging hole of the mold, and keep the mold vibrating vertically at a frequency of 100 Hz. Then, press the filled mold by using vertical cold pressing, with a pressure of 150 MPa, a pressure increasing rate of 5 MPa / s, and a pressure maintaining time of 3 min. After cold pressing, a TC4 / AZ91 composite material blank with a size of 300 mm*200 mm*85 mm is obtained.

[0074] 4. Sintering: load the pressed TC4 / AZ91 composite material blank into a high-vacuum sintering furnace, vacuumize to a vacuum degree ≤ 2*10 -3 MPa, stop, fill argon to normal pressure, repeat vacuum treatment for 3 times, fill argon again to a pressure of 500 Pa, heat to 800 ℃ at a heating rate of 10 ℃ / min, maintain for 0.5 h, cool to 750 ℃, maintain for 1.5 h, and then cool to room temperature with the furnace. A high-toughness TC4 wire framework reinforced magnesium-based composite material in this example is obtained.

[0075] Example 2

[0076] This example provides a preparation method of a high-toughness TC4 wire framework reinforced magnesium-based composite material, which specifically includes the following steps:

[0077] 1. Material preparation: The composite material uses TC4 wire with purity ≥ 99.99% and diameter of 3.5 mm, and spherical AZ91 powder with purity ≥ 99.99% and particle size of 100 μm.

[0078] Prepare raw materials according to the volume percentage of TC4 wire being 50% and the volume percentage of spherical AZ91 powder being 50%;

[0079] 2. Surface treatment: immerse the TC4 wire in an ethanol solution with a concentration of 95% for 10 min to remove surface impurity elements, then clean and dry.

[0080] 3. Filling: insert the dried TC4 wire into the through-hole array of the mold in Figure 1The array of through holes in the mold is further fixed in the mold, spherical AZ91 powder is added from the feeding hole on the mold, and the mold is kept vibrating vertically at a frequency of 100 Hz. Then, pressing is performed: the filled mold is pressed by vertical cold pressing, the pressure is 180 MPa, the pressure rising rate is 5 MPa / s, and the pressure holding time is 6 min. After cold pressing, a TC4 / AZ91 composite material blank with a size of 300 mm*200 mm*95 mm is obtained.

[0081] 4. Sintering: the pressed TC4 / AZ91 composite material blank is loaded into a high-vacuum sintering furnace, vacuum is drawn to a vacuum degree ≤2*10 -3 MPa is stopped, argon is filled to normal pressure, vacuum treatment is repeated 3 times, argon is filled again to a pressure of 500 Pa, the temperature is raised to 820℃ at a rate of 10℃ / min, the temperature is kept for 0.5h, the temperature is lowered to 750℃ and kept for 2h, and then the furnace is cooled to room temperature. A high-toughness TC4 wire frame reinforced magnesium-based composite material in this example is obtained.

[0082] Comparative Example 1

[0083] The example provides a preparation method of a TC4 frame reinforced magnesium-based composite material, which specifically comprises the following steps:

[0084] 1. Preparing a porous TC4 preform: TC4 powder is loaded into a mold, a pressure of 12 MPa is applied to compact the TC4 powder, and then the compacted TC4 powder is placed in a vacuum sealed container for vacuum sintering. The sintering temperature is raised from room temperature to 1300℃, and then kept at 1300℃ for 2h. After cooling to room temperature, a porous TC4 preform is obtained.

[0085] 2. Magnesium alloy infiltration: AZ91 magnesium alloy is melted into a magnesium alloy melt under a protective atmosphere and heated to 720℃ for heat preservation. The magnesium alloy melt is infiltrated into the porous TC4 preform, and then air-cooled to room temperature. A TC4 frame reinforced magnesium-based composite material in this example is obtained.

[0086] The TC4 frame reinforced magnesium-based composite material in this example comprises the following volume percentages of raw materials: the volume percentage of TC4 powder is 45%, and the volume percentage of spherical AZ91 powder is 55%.

[0087] Comparative Example 2

[0088] The example provides a preparation method of a TC4 frame reinforced magnesium-based composite material, which specifically comprises the following steps:

[0089] TC4 spherical particles with a particle size of 50 μm and AZ91 spherical particles with a particle size of 100 μm are mixed uniformly under inert atmosphere protection, and then the uniformly mixed powder is added into a crucible and heated to 720 °C, a stirring paddle is inserted into the melt surface to an appropriate position, the stirring paddle is started, the stirring speed is 1000 r / min, and uniform stirring is performed for 20 min, then the temperature is lowered to 690 °C, the stirring is stopped, and then ultrasonic treatment is started, the ultrasonic frequency is 30 kHz, and the time length is 20 min, then the mixed melt is left to stand for 20 min, finally the crucible containing the melt is quickly placed into a water cooling system for cooling, the water cooling system uses circulating water cooling, and a TC4 particle reinforced magnesium-based composite material in a cast state can be obtained.

[0090] The TC4 particle reinforced magnesium-based composite material in a cast state in this example includes the following volume percentages of raw materials: the volume percentage of TC4 powder is 45%, and the volume percentage of spherical AZ91 powder is 55%.

[0091] Performance test

[0092] The surface morphology of the magnesium-based composite material prepared in Example 1 is tested by a scanning electron microscope, as shown in Figure 2 , and then the surface morphology of the magnesium-based composite material prepared in Example 1 at the fracture position is tested, as shown in Figure 3 , and the surface morphology of the magnesium-based composite material prepared in Example 1 at the local fracture position is tested by a high-magnification scanning electron microscope, as shown in Figure 4 . As shown in Figures 2-3 , the TC4 wire frame in the magnesium-based composite material prepared in Example 1 is complete in shape, and serrated interface structures can be clearly observed at the bonding position, which helps to improve the strength and elongation of the magnesium-based composite material. As shown in Figure 4 , the tearing type fracture lines can be observed at the enlarged fracture position of the magnesium-based composite material prepared in Example 1, which also proves the excellent interface bonding between TC4 and magnesium alloy. In addition, the implantation of the TC4 wire frame better hinders the crack propagation during the deformation of the magnesium-based composite material, and enhances the toughness of the magnesium-based composite material.

[0093] The yield strength, tensile strength, elongation and elastic modulus of the magnesium-based composite materials obtained in Examples 1-2 and Comparative Examples 1-2 are tested, and the stress-strain curves obtained during the test are shown in Figure 5 and Figure 6 , and the specific test results are shown in Table 1.

[0094] Table 1 Mechanical property data of the magnesium-based composite materials obtained in Examples 1-2 and Comparative Examples 1-2

[0095]

[0096] As can be seen from Table 1, compared with Comparative Examples 1-2, the mechanical properties of the magnesium-based composite material prepared by the preparation method in Example 1-2 are significantly improved, specifically: the yield strength is 512-525 MPa, the tensile strength is 549-571 MPa, the elongation is 4.9-5.7%, and the elastic modulus is more than 80 GPa. The reason for the performance improvement of the magnesium-based composite material in Example 1-2 may be that the TC4 wire frame is uniformly distributed inside the magnesium-based composite material, acts as a reinforcing phase to bear the external force when the material deforms, and the close interface between the TC4 wire frame and the matrix helps to conduct and bear the stress during deformation. Comparative Example 1 uses a sintering process to prepare a titanium alloy frame and then infiltrates, which may have closed pore defects during the infiltration process, resulting in poor strength, and the environmental factors during the infiltration process are huge, such as oxidation and temperature control, which are difficult problems, so the preparation equipment and environment have high requirements. The present application uses TC4 wire arranged and fixed in the mold as the frame, which avoids the strength instability defect in the sintering process of the frame, and on the basis of ensuring the strength of the frame, uses magnesium alloy powder to fill the frame and directly sinter, controls the environmental parameters (temperature, oxygen content, atmosphere pressure, holding time, etc.) through a high vacuum sintering furnace, and effectively avoids the formation of defects in the composite material, thereby obtaining excellent strength.

[0097] In addition, compared with Example 1-2, the reason for the decrease in density of the magnesium-based composite material in Comparative Examples 1-2 is that there are defects and pores in the prepared magnesium-based composite material, resulting in a decrease in density.

[0098] From Figure 5 and Figure 6 It can be seen that the high-toughness TC4 wire frame reinforced magnesium-based composite material prepared in Example 1-2 has significantly higher mechanical properties than Comparative Example 1, has excellent tensile properties, and has good elastic modulus, which means that it is more suitable for future engineering application scenarios. As can be seen from the comparison between Example 1 and Example 2, as the volume percentage of TC4 wire increases, the mechanical properties of the prepared magnesium-based composite material also significantly increase.

[0099] The above embodiments of the present application are described in detail, but the present application is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A magnesium-based composite material, characterized in that: The raw materials include the following volume percentages: 45-50% titanium alloy frame; 50-55% magnesium alloy; the titanium alloy frame is composed of at least two titanium alloy wires arranged in a row; The spacing between two adjacent titanium alloy wires is 0.75mm-5mm; the diameter of the titanium alloy wire is 0.5mm-3.5mm. The magnesium-based composite material is prepared by a method including the following steps: Titanium alloy wires are arranged and fixed in a mold to obtain a titanium alloy frame; Then, magnesium alloy is injected into the titanium alloy frame, vibrated, and pressed to form a composite material blank. The magnesium-based composite material is obtained by sintering the composite material preform. The sintering pressure is 500~1000Pa; the sintering process involves first heating to 780~850℃ and holding for 0.5~1h, then cooling to 730~770℃ and holding for 1.5~2h.

2. The magnesium-based composite material according to claim 1, characterized in that: The titanium alloy wire is made of at least one of TC4, TC6, TC11, Ti1023, TA12, TA7, and TA11.

3. The magnesium-based composite material according to claim 1, characterized in that: The magnesium alloy includes at least one of Mg-Al alloys, Mg-Zn alloys, Mg-Mn alloys, and Mg-RE alloys.

4. The magnesium-based composite material according to claim 1, characterized in that: The particle size of the magnesium alloy is 10~100μm.

5. The method for preparing the magnesium-based composite material according to any one of claims 1 to 4, characterized in that: Includes the following steps: Titanium alloy wires are arranged and fixed in a mold to obtain a titanium alloy frame; Then, magnesium alloy is injected into the titanium alloy frame, vibrated, and pressed to form a composite material blank. The magnesium-based composite material is obtained by sintering the composite material preform. The sintering pressure is 500~1000Pa; the sintering process involves first heating to 780~850℃ and holding for 0.5~1h, then cooling to 730~770℃ and holding for 1.5~2h.

6. The method for preparing the magnesium-based composite material according to claim 5, characterized in that: The compression molding has at least one of the following characteristics: (b1) The pressing pressure is 100~180MPa; (b2) The pressurization rate of the compression molding is 1~10MPa / s; (b3) The holding time for the pressing and molding process is 1 to 30 minutes.

7. The method for preparing the magnesium-based composite material according to claim 5, characterized in that: The frequency of the vibration is 25~100HZ; and / or the direction of the vibration is vertical.

8. The method for preparing the magnesium-based composite material according to claim 5, characterized in that: The step of sintering the composite material blank is as follows: the composite material blank is placed in a sintering furnace, vacuumed 1 to 5 times, and then filled with inert gas for sintering.

9. The method for preparing the magnesium-based composite material according to claim 5 or 8, characterized in that: The sintering has at least one of the following characteristics: (c1) The sintering atmosphere is an inert atmosphere; (c2) The heating rate of the sintering is 5~15℃ / min.

10. The application of the magnesium-based composite material according to any one of claims 1 to 4 in the fields of transportation equipment, marine engineering equipment, building materials or electronic equipment.

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