A magnesium rare earth-based composite material reinforced with zirconium metal particles and its preparation method

Abstract

This invention discloses a zinc-reinforced magnesium rare-earth-based composite material, wherein the mass percentage content of each component in the composite material is: 95-99% magnesium rare-earth alloy and 1-5% zirconium particles. This invention also provides a method for preparing this zinc-reinforced magnesium rare-earth-based composite material. The zinc-reinforced magnesium rare-earth-based composite material provided by this invention, through a combination of low-temperature stirring, ultrasonic dispersion, and high-temperature stirring, can effectively improve the dispersion effect and final yield of zirconium particles. Furthermore, it produces fewer oxide inclusions during the smelting and casting process compared to traditional high-temperature stirring, resulting in superior microstructure and properties. The as-cast sample of the prepared zinc-reinforced magnesium rare-earth-based composite material exhibits a tensile strength of up to 223 MPa, a yield strength of 123 MPa, and an elongation of 13.74%, demonstrating excellent mechanical properties.

Description

Technical Field

[0001] This invention belongs to the field of magnesium-based composite material technology, specifically relating to a magnesium rare earth-based composite material reinforced with zirconium metal particles and its preparation method. Background Technology

[0002] Magnesium and magnesium alloys have low density, typically around 2 g / cm³. 3 Below, aluminum alloys weigh 2 / 3 of the weight of steel and 1 / 4 of the weight of aluminum alloys, making them the lightest metallic structural materials. Magnesium and magnesium alloys possess excellent properties such as high specific strength, specific modulus, good electromagnetic shielding, and damping. Their application in aerospace and automotive fields can significantly reduce the weight of components, decrease energy consumption, and improve the operational efficiency of spacecraft and automobiles. Despite these advantages, the strength, stiffness, and wear resistance of magnesium and its alloys as structural materials are not ideal. Adding appropriate reinforcing phases to magnesium and its alloys to prepare magnesium-based composite materials can improve their properties to some extent. Compared to the matrix, magnesium-based composite materials show varying degrees of improvement in strength, modulus, damping performance, wear resistance, and high-temperature creep resistance.

[0003] Compared to fiber-reinforced and whisker-reinforced magnesium matrix composites, particle-reinforced magnesium matrix composites have a relatively simpler preparation process, lower production costs, and better, isotropic performance, making them the most widely used type of magnesium matrix composite. Commonly used particle reinforcements in magnesium matrix composites primarily refer to ceramic particles with high strength, high modulus, wear resistance, and high temperature resistance, such as SiC, Si3N4, Al2O3, TiC, B4C, and TiB2 particles. While ceramic particles are used as reinforcements in metal matrix composites to improve the tribological properties, stiffness, hardness, and damping properties of the matrix alloy, they can lead to reduced ductility. Compared to ceramic particles, metal reinforcement phases exhibit better wettability, greater ductility, and higher mechanical compatibility with the molten matrix alloy.

[0004] Zirconium (Zr) has a molecular weight of 91.22, a melting point of 1852℃, and a relative density of 6.49. It is commonly used in magnesium matrices as a grain refiner, typically added to molten magnesium via master alloying. However, zirconium has low solubility in molten magnesium; any amount exceeding a critical value exists as particles and settles at the bottom of the melt. Common smelting processes often involve adding an excess of magnesium-zirconium master alloy to introduce zirconium with a high burn-off rate. A large amount of undissolved zirconium particles settle during smelting and are wasted in subsequent processing, resulting in underutilization of rare earth resources. Summary of the Invention

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the main objective of this invention is to provide a magnesium rare-earth-based composite material reinforced with zirconium particles, addressing the issues of low solubility of zirconium in molten magnesium, excessive sedimentation of undissolved zirconium particles during smelting leading to low yield and waste of rare-earth elements, while also failing to effectively disperse and enhance mechanical properties. This invention also provides a method for preparing this magnesium rare-earth-based composite material reinforced with zirconium particles.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A magnesium rare earth-based composite material reinforced with zirconium particles, wherein the mass percentage content of each component in the composite material is: 95-99% magnesium rare earth alloy and 1-5% zirconium particles.

[0008] In some specific embodiments, the magnesium rare earth alloy is a Mg-Gd-Y series magnesium alloy.

[0009] In some specific embodiments, the zirconium particles have a particle size ≤50μm.

[0010] A method for preparing a magnesium rare earth-based composite material reinforced with zirconium particles, comprising the following steps:

[0011] After preheating the Mg-30Zr master alloy, it was added to the magnesium rare earth alloy melt. The temperature of the molten magnesium rare earth alloy was then lowered to above the semi-solid temperature and stirred thoroughly. Then, it was placed in an ultrasonic preheating chamber and subjected to ultrasonic treatment. After ultrasonic treatment, it was stirred at a low speed for a short time and then solidified with water to obtain a magnesium rare earth matrix composite material reinforced with zirconium particles.

[0012] In some specific embodiments, the preparation process of the magnesium rare earth alloy melt is as follows: under the protection of a mixed gas of CO2 and SF6 with a volume ratio of 99:1, the magnesium rare earth alloy is placed in a crucible and heated in a melting furnace to 680-780°C until it is completely melted. After stirring evenly, the slag on the surface of the melt is scraped off to obtain the magnesium rare earth alloy melt.

[0013] In some specific embodiments, after the zirconium particles are added to the magnesium rare earth alloy melt, the temperature of the magnesium aluminum rare earth melt is reduced to 10-20°C above the liquidus line, and the melt is stirred at a mechanical stirring speed of 150-450 rpm for 3-5 minutes to obtain a composite melt.

[0014] In some specific embodiments, after adding the zirconium particles to the magnesium rare earth alloy melt and mechanically stirring it evenly, the mechanical stirring device is removed, and an ultrasonic dispersion device is placed in it. The ultrasonic device is preheated and heated to 680-700°C. The ultrasonic device is turned on and ultrasonically stirred for 5-10 minutes at a power of 1500-2000W, controlling the ultrasonic temperature range between 680 and 740°C, while simultaneously heating and ultrasonicating the melt.

[0015] In some specific embodiments, the short-term low-speed stirring is performed at a stirring speed of 150-300 rpm for 30-60 seconds.

[0016] In some specific embodiments, the preheating conditions for the Mg-30Zr master alloy are: a preheating temperature of 150-200℃ and a preheating time of 30-60 min.

[0017] Compared with the prior art, the present invention has at least the following advantages:

[0018] 1) The metallic zirconium particle-reinforced magnesium rare earth-based composite material provided by this invention uses a magnesium rare earth alloy as the matrix alloy and metallic zirconium particles as the reinforcing phase. This is achieved by adding a magnesium-zirconium master alloy after melting the magnesium rare earth alloy and cooling it to 10-20°C above the liquidus temperature, followed by stirring and ultrasonic processing. Starting stirring at 10-20°C above the liquidus temperature ensures sufficient wettability between the zirconium particles and the melt surface, as well as sufficient viscosity in the melt. During stirring, the melt enters a semi-solid state, which allows for full utilization of the surface interaction between the fine second phase formed in the solution and the zirconium particles. This results in a more uniform distribution of zirconium particles within the magnesium rare earth melt. Stirring in the semi-solid state also reduces porosity, contributing to system stability and minimizing casting defects such as oxide inclusions. Ultrasonic treatment then further disperses the fine zirconium particles through ultrasonic cavitation, mitigating sedimentation during heating. High-temperature stirring before cooling, even at low speeds, ensures better dispersion of large zirconium particles that settle during heating before cooling. The shorter duration and lower stirring speed also reduce the amount of casting defects such as oxide inclusions caused by entrained gases. This combination of low-temperature stirring, ultrasonic dispersion, and high-temperature stirring ensures that the zirconium particles, acting as reinforcement, are uniformly distributed within the magnesium rare earth alloy. This particle reinforcement mechanism, a key component of the composite material, allows the zirconium particles to not only refine the grain size but also act as a reinforcing phase, effectively improving particle dispersion and yield, and ultimately enhancing the mechanical properties of the matrix. Furthermore, the oxide inclusions generated during the smelting and casting process are less than those generated by traditional high-temperature stirring, resulting in better microstructure and properties. The as-cast sample of the magnesium rare earth-based composite material reinforced with zirconium metal particles has a tensile strength of up to 223 MPa, a yield strength of 123 MPa, and an elongation of 13.74%, exhibiting excellent mechanical properties.

[0019] 2) The preparation method provided by this invention has the advantages of simple process, low cost, and high production efficiency. Compared with the traditional composite material melting and casting method, which requires the addition of micron-sized particles, resulting in higher costs and the introduction of more oxide impurities, this invention uses a magnesium-zirconium master alloy as an additive to introduce zirconium particles, which has greater development potential and is suitable for industrial production. In addition, the resource waste problem of zirconium in magnesium melt can also be improved accordingly. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below.

[0021] Figure 1 This is a SEM image of the zirconium particle-reinforced magnesium rare earth-based composite material prepared in Example 1 of this invention;

[0022] Figure 2 This is a SEM image of the zirconium particle-reinforced magnesium rare earth-based composite material prepared in Example 2 of this invention;

[0023] Figure 3 This is a SEM image of the zirconium particle-reinforced magnesium rare earth-based composite material prepared in Example 3 of this invention;

[0024] Figure 4 Here is a SEM image of the material prepared in Comparative Example 1 of this invention;

[0025] Figure 5 Here is a SEM image of the material prepared in Comparative Example 2 of this invention;

[0026] Figure 6 This is a SEM image of the material prepared in Comparative Example 3 of this invention. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are merely descriptive and not limiting, and should not be construed as limiting the scope of protection of the present invention.

[0028] When a quantity, concentration, or other value or parameter is described as a range, preferred range, or preferred upper and lower limits, it should be understood that it is equivalent to specifically disclosing any range by combining any pair of upper or preferred values ​​with any lower or preferred values, regardless of whether the range is specifically disclosed. Unless otherwise stated, the numerical range values ​​listed herein include the endpoints of the range and all integers and fractions within that range.

[0029] Unless otherwise stated, all percentages, parts, ratios, etc. in this document are by weight.

[0030] The materials, methods, and embodiments described herein are exemplary and should not be construed as limiting unless otherwise stated.

[0031] The magnesium rare earth alloys and magnesium zirconium master alloys used in the following embodiments are all commercially available products. The magnesium rare earth alloy used is a Mg-Gd-Y series magnesium alloy, which serves as the matrix alloy. The magnesium zirconium master alloy is a Mg-30Zr master alloy, which is mainly used to add zirconium particles as reinforcement. The particle size of the zirconium particles is ≤50μm. The magnesium rare earth alloy specifically selected in the following embodiments is a Mg-Gd-Y alloy.

[0032] The metallurgical microscope used in the following implementation was an OLYMPUS PMG3.

[0033] Example 1

[0034] The method for preparing the magnesium rare earth-based composite material reinforced with zirconium particles provided by the present invention includes the following steps:

[0035] 1) Selection of magnesium matrix and reinforcement: Commercial Mg-Gd-Y alloy is used as magnesium matrix and zirconium particles are used as reinforcement; the zirconium particles are added by using magnesium-zirconium master alloy as the addition material, wherein the content of metallic zirconium is 5% of the matrix alloy.

[0036] 2) Preheat the magnesium-zirconium master alloy by preheating the Mg-30Zr master alloy at 180℃ for 45 minutes.

[0037] 3) Preparation of magnesium rare earth alloy melt: Under the protection of a mixed gas of CO2 and SF6 with a volume ratio of 99:1, 1.5 kg of magnesium rare earth alloy (Mg-Gd-Y alloy) was placed in a crucible (diameter 89 mm, height 270 mm) and heated in a melting furnace to 720℃ until it was completely melted. At the same time, a refining agent was added and stirred evenly. After standing, the slag on the surface of the melt was scraped off to obtain magnesium rare earth alloy melt.

[0038] 4) Preparation of composite melt: Add magnesium-zirconium master alloy to magnesium rare earth alloy melt at 740℃, let stand for several minutes, cool magnesium rare earth alloy melt to 10℃ above liquidus line (630℃) (the semi-solid temperature is 620℃, the actual operating temperature is 10-20℃ above semi-solid temperature), and stir thoroughly with mechanical stirring rod at 300rpm for 3 minutes to obtain composite melt;

[0039] 5) Casting of magnesium rare earth-based composite materials:

[0040] After mechanical stirring is completed, remove the mechanical stirring device and simultaneously place the ultrasonic dispersion device in. Preheat the ultrasonic device and raise the temperature to 680°C. Turn on the ultrasonic device and ultrasonicate for 8 minutes at a power of 1800W, controlling the ultrasonic temperature range at 700°C while simultaneously ultrasonicating the melt. After ultrasonication is completed, use a mechanical stirring rod to stir at a speed of 150rpm for 60s, then water cool, and obtain a composite material of magnesium rare earth matrix reinforced with metallic zirconium particles.

[0041] Example 2

[0042] The method for preparing the magnesium rare earth-based composite material reinforced with zirconium particles provided by the present invention includes the following steps:

[0043] 1) Selection of magnesium matrix and reinforcement: Commercial Mg-Gd-Y alloy is used as magnesium matrix and zirconium particles are used as reinforcement; the zirconium particles are added by using magnesium-zirconium master alloy as the addition material, wherein the content of metallic zirconium is 1% of the matrix alloy.

[0044] 2) Preheat the magnesium-zirconium master alloy by preheating the Mg-30Zr master alloy at 180℃ for 45 minutes.

[0045] 3) Preparation of magnesium rare earth alloy melt: Under the protection of a mixed gas of CO2 and SF6 with a volume ratio of 99:1, 1.5 kg of magnesium rare earth alloy (Mg-Gd-Y alloy) was placed in a crucible (diameter 89 mm, height 270 mm) and heated in a melting furnace to 720℃ until it was completely melted. At the same time, a refining agent was added and stirred evenly. After standing, the slag on the surface of the melt was scraped off to obtain magnesium rare earth alloy melt.

[0046] 4) Preparation of composite melt: Add magnesium-zirconium master alloy to magnesium rare earth alloy melt at 740℃, let stand for several minutes, cool magnesium rare earth alloy melt to 640℃ above the liquidus line (the semi-solid temperature is 620℃, the actual operating temperature is 10-20℃ above the semi-solid temperature), and stir thoroughly with a mechanical stirring rod at 300 rpm for 5 minutes to obtain composite melt.

[0047] 5) Casting of magnesium rare earth-based composite materials:

[0048] After mechanical stirring is completed, remove the mechanical stirring device and simultaneously place the ultrasonic dispersion device in. Preheat the ultrasonic device and raise the temperature to 680°C. Turn on the ultrasonic device and ultrasonicate for 5 minutes at a power of 1800W, controlling the ultrasonic temperature range at 700°C while simultaneously ultrasonicating the melt. After ultrasonication is completed, use a mechanical stirring rod to stir at a speed of 150rpm for 60 seconds, then water cool, and obtain a composite material of magnesium rare earth matrix reinforced with metallic zirconium particles.

[0049] Example 3

[0050] The method for preparing the magnesium rare earth-based composite material reinforced with zirconium particles provided by the present invention includes the following steps:

[0051] 1) Selection of magnesium matrix and reinforcement: Commercial Mg-Gd-Y alloy is used as magnesium matrix and zirconium particles are used as reinforcement; the zirconium particles are added by using magnesium-zirconium master alloy as the addition material, wherein the content of metallic zirconium is 1% of the matrix alloy.

[0052] 2) Preheat the magnesium-zirconium master alloy by preheating the Mg-30Zr master alloy at 180℃ for 45 minutes.

[0053] 3) Preparation of magnesium rare earth alloy melt: Under the protection of a mixed gas of CO2 and SF6 with a volume ratio of 99:1, 1.5 kg of magnesium rare earth alloy (Mg-Gd-Y alloy) was placed in a crucible (diameter 89 mm, height 270 mm) and heated in a melting furnace to 720℃ until it was completely melted. At the same time, a refining agent was added and stirred evenly. After standing, the slag on the surface of the melt was scraped off to obtain magnesium rare earth alloy melt.

[0054] 4) Preparation of composite melt: Add magnesium-zirconium master alloy to magnesium rare earth alloy melt at 740℃, let stand for several minutes, cool magnesium rare earth alloy melt to 634℃ above the liquidus line (the semi-solid temperature is 620℃, the actual operating temperature is 10-20℃ above the semi-solid temperature), and stir thoroughly with a mechanical stirring rod at 300 rpm for 5 minutes to obtain composite melt.

[0055] 5) Casting of magnesium rare earth-based composite materials:

[0056] After mechanical stirring is completed, remove the mechanical stirring device and simultaneously place the ultrasonic dispersion device in. Preheat the ultrasonic device and raise the temperature to 680°C. Turn on the ultrasonic device and ultrasonicate for 10 minutes at a power of 1800W, controlling the ultrasonic temperature range at 700°C while ultrasonicating the melt. After ultrasonication is completed, use a mechanical stirring rod to stir at 300rpm for 30s, then water cool, and obtain a composite material of magnesium rare earth matrix reinforced with metallic zirconium particles.

[0057] Comparative Example 1:

[0058] The comparative example provided is a VW92 (Mg-10Gd-2Y-1Zn-0.5Zr) alloy matrix prepared by conventional melting method, which does not introduce particles through intermediate alloying and does not involve external mechanical stirring or ultrasonic dispersion processes.

[0059] Comparative Example 2:

[0060] The metallic zirconium particle-reinforced magnesium rare earth-based composite material provided in this comparative example has the same composition and proportion as that in Example 1; its preparation process is basically the same as that in Example 1, except that no subsequent auxiliary dispersion process is used after the low-temperature semi-solid mechanical stirring is completed.

[0061] Comparative Example 3:

[0062] The metallic zirconium particle-reinforced magnesium rare earth-based composite material provided in this comparative example has the same composition and proportion as that in Example 1; its preparation process is basically the same as that in Example 1, except that a low-speed stirring process at high temperature is not used after ultrasonic dispersion.

[0063] Performance testing:

[0064] The applicant uses the zirconium-reinforced magnesium matrix composites prepared in Examples 1-3 and the matrix alloys prepared in Comparative Examples 1-3 as examples to test and illustrate the performance of the zirconium-reinforced magnesium matrix composites prepared in this application.

[0065] 1. Mechanical property testing

[0066] This application conducts performance tests on the zirconium particle-reinforced magnesium matrix composites prepared in Examples 1-3 and the matrix material of Comparative Example 1. The mechanical properties were tested according to GB / T 1177-2018, and the specific results are shown in Table 1:

[0067] Table 1: Mechanical properties of zirconium particle-reinforced magnesium matrix composites in Examples 1-3 and the matrix in Comparative Example 1

[0068] Yield strength (MPa) Tensile strength (MPa) Elongation (%) Example 1 123 223 13.74 Example 2 113 234 13.14 Example 3 120 215 12.59 Comparative Example 1 109 196 9.81

[0069] As shown in Table 1, after introducing zirconium particles, the composite materials prepared in Examples 1-3 showed significant improvements in yield strength, tensile strength, and elongation compared to the matrix prepared in Comparative Example 1. Furthermore, the yield strength increased with increasing particle content. Example 1 exhibited the best overall performance, with a yield strength of 123 MPa, a tensile strength of 223 MPa, and an elongation of 13.74%. Example 2 had a yield strength of only 113 MPa compared to Example 1, but a higher tensile strength of 234 MPa. Example 3 achieved a yield strength of 120 MPa, and its tensile strength increased by 19 MPa compared to the matrix. This demonstrates that introducing zirconium particles into a magnesium-zirconium master alloy can effectively improve the mechanical properties of the matrix. In summary, the preparation process of the zirconium particle-reinforced magnesium matrix composite material provided in this application can effectively improve the mechanical properties of the matrix.

[0070] 2. Scanning electron microscopy (SEM) determination

[0071] This application performs electron microscopy scanning on the materials prepared in Examples 1-3 and Comparative Examples 1-3, and the specific results are as follows: Figure 1-6 As shown: From Figure 1-3 It can be seen that the zirconium particle-reinforced magnesium matrix composites prepared in Examples 1-3 have a dense matrix structure with fewer pores and a good zirconium particle yield. In some examples, the zirconium particle size distribution range is relatively large, mainly because the particle size distribution range of the magnesium-zirconium master alloy added during the preparation process is relatively large. Therefore, the magnesium-zirconium master alloy added during the preparation process has an important influence on the particle morphology of the magnesium matrix composite. Comparing Example 1 and Comparative Example 2, it can be found that, after mechanical stirring in a semi-solid state, the yield of Comparative Example 2 is lower. This is because after the melt is fully stirred at low temperature, the time of settling during the heating process will cause the denser zirconium particles to settle, indicating that mechanical stirring at low temperature is not enough to achieve a good yield. Comparing Example 1 and Comparative Example 3, it can be found that the particle yield in Comparative Example 3 is still low, but the microstructure has changed significantly compared to Comparative Example 2, and the grains are also significantly finer. This indicates that the process of simultaneous heating and ultrasonication can disperse some small zirconium particles and better exert the grain refinement effect on the magnesium alloy matrix. However, the dispersion of large zirconium particles still requires high-temperature and low-speed stirring after the ultrasonication step. It is evident that, for preparing zirconium particles with good yield, the combination of low-temperature stirring, ultrasonic dispersion, and high-temperature stirring can effectively improve the dispersion effect and final yield of zirconium particles, while avoiding defects such as oxidation inclusions caused by long-term stirring and high-speed stirring at high temperatures.

[0072] In summary, the zirconium particle-reinforced magnesium matrix composite material provided in this application introduces zirconium particles through a magnesium-zirconium master alloy, solving the problem of requiring separate external particle addition during the smelting process of traditional particle-reinforced magnesium matrix composites. This results in lower costs and a simpler preparation process. The smelting and casting process for the zirconium particle-reinforced magnesium matrix composite material provided in this application combines the advantages of low-temperature stirring, ultrasonic-assisted stirring, and high-temperature stirring. Semi-solid mechanical stirring initially disperses the zirconium particles, ultrasonic assistance slows down particle settling, and low-speed stirring at high temperature increases the final particle yield, effectively reducing problems such as significant gas entrapment and severe oxidation inclusions, resulting in more stable microstructure and mechanical properties. The zirconium particle-reinforced magnesium matrix composite material provided in this application exhibits excellent comprehensive mechanical properties, lower cost, and a simpler preparation process, showing broad application prospects.

[0073] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A method for producing a metal zirconium particle reinforced magnesium-rare earth based composite material, characterized by, The method comprises the following steps: 1) preheat the Mg-30Zr intermediate alloy and add it into the magnesium-rare earth alloy melt, reduce the temperature of the magnesium-rare earth alloy melt to 10-20℃ above the liquidus, and stir at a mechanical stirring speed of 150-450rpm for 3-5min to obtain a composite melt; 2) add the zirconium particles into the magnesium-rare earth alloy melt and stir uniformly, then remove the mechanical stirring device and put in an ultrasonic dispersion device, preheat the ultrasonic device and heat it to 680-700℃, open the ultrasonic device, and ultrasonically treat the melt at a power of 1500-2000w for 5-10min, control the temperature range of the ultrasonic treatment to be 680-740℃, and heat and ultrasonically treat the melt simultaneously; 3) after the ultrasonic treatment, stir at a stirring speed of 150-300rpm for 30-60s, then water cool and solidify to obtain a zirconium particle reinforced magnesium-rare earth alloy composite material; The mass percentage of each component in the composite material is: 95-99% of the magnesium-rare earth alloy and 1-5% of the zirconium particles, and the Mg-30Zr intermediate alloy is a magnesium-zirconium intermediate alloy containing zirconium particles with a particle size of ≤50μm.

2. The method for preparing the zinc-reinforced magnesium rare-earth-based composite material according to claim 1, characterized in that, The magnesium-rare earth alloy is a Mg-Gd-Y magnesium alloy.

3. The method for preparing the zinc-reinforced magnesium rare-earth-based composite material according to claim 1, characterized in that, The preparation process of the magnesium-rare earth alloy melt is as follows: under the protection of a mixed gas of CO2 and SF6 with a volume ratio of 99:1, put the magnesium-rare earth alloy into a crucible and heat it with a smelting furnace, heat it to 680-780℃, and after complete melting, stir uniformly and remove the scum on the surface of the melt to obtain the magnesium-rare earth alloy melt.

4. The method for preparing the zinc-reinforced magnesium rare-earth-based composite material according to claim 1, characterized in that, The preheating conditions of the Mg-30Zr intermediate alloy are as follows: the preheating temperature is 150-200℃, and the preheating time is 30-60min.

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