Magnesium-titanium alloy and its preparation method and application

Abstract

The present invention discloses a magnesium-titanium alloy and its preparation method and application, and relates to the technical field of alloy materials. The method comprises subjecting a mixed powder obtained by mixing a magnesium alloy and a nano-titanium alloy to spark plasma sintering, and then hot extruding the sintered magnesium-titanium alloy preform. By adding nano-titanium alloy to the magnesium alloy and combining it with the spark plasma sintering method, the prepared magnesium-titanium alloy has finer and more uniform grains, achieving the effect of inhibiting grain growth and refining the grains. The sintered preform is then hot extruded. The material structure deformed by hot extrusion is more uniform, the microscopic defects of the material are reduced, and the strength of the magnesium-titanium alloy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of alloy materials, and in particular to a magnesium-titanium alloy and a preparation method and application thereof. Background Art

[0002] With the rapid development of automobile, aerospace and other fields, people have an increasingly high demand for lightweight, high-performance multifunctional materials, and lightweight, high-performance raw materials such as magnesium alloys and titanium alloys have received widespread attention.

[0003] Magnesium alloys have low density, high specific strength and specific stiffness. If they can be widely used in industries such as industrial manufacturing and transportation, they can not only significantly reduce the weight of industrial machinery and vehicles, improve their maneuverability, but also achieve energy conservation and emission reduction. However, magnesium alloys have lower strength and poorer plasticity than steel, which greatly reduces the mechanical properties of magnesium-titanium alloys, thus limiting their development in the field of lightweight, high-performance multifunctional materials.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a magnesium-titanium alloy and a preparation method and application thereof.

[0006] The present invention is achieved in that:

[0007] In a first aspect, the present invention provides a method for preparing a magnesium-titanium alloy, comprising spark plasma sintering a mixed powder obtained by mixing a magnesium alloy and a nano-titanium alloy, and then hot extruding the sintered magnesium-titanium alloy preform.

[0008] In an optional embodiment, the parameters of spark plasma sintering include: a sintering temperature of 500-560° C., a sintering holding time of 3-10 min, a sintering pressure of 30-50 MPa, and a sintering rate of 80-120° C. / min.

[0009] Preferably, the sintering temperature is 520-540° C., the sintering holding time is 4-6 min, the sintering pressure is 35-45 MPa, and the sintering rate is 90-110° C. / min.

[0010] Preferably, the sintering temperature is 530° C., the sintering holding time is 5 min, the sintering pressure is 40 MPa, and the sintering rate is 100° C. / min.

[0011] In an optional embodiment, spark plasma sintering is performed under vacuum conditions with a vacuum degree of ≤1×10 -2 Pa.

[0012] Preferably, before sintering, the mixed powder is placed in a mold and then spark plasma sintering is performed.

[0013] Preferably, the amount of mixed powder loaded into the mold each time is 80-100 g.

[0014] Preferably, the mold is made of graphite.

[0015] In an optional embodiment, the parameters of hot extrusion include: an extrusion temperature of 300 to 400° C., an extrusion ratio of 25:1 to 4:1, and an extrusion rate of 4 to 8 mm / s.

[0016] Preferably, the extrusion temperature is 340-360° C., the extrusion ratio is 20:1-12:1, and the extrusion rate is 5-7 mm / s.

[0017] Preferably, the extrusion temperature is 350° C., the extrusion ratio is 16:1, and the extrusion rate is 6 mm / s.

[0018] In an optional embodiment, the preform is placed in a resistance furnace for heating and keeping the temperature before hot extrusion.

[0019] Preferably, the heating temperature is 300-400°C and the holding time is 15-30 minutes;

[0020] Preferably, the atmosphere in the resistance furnace is an inert atmosphere, which includes nitrogen or argon.

[0021] In an optional embodiment, the magnesium alloy includes any one of AZ31, AZ80M and AZ91D, and the nano-titanium alloy includes any one of TC4, TC6 and TC17; preferably, the magnesium alloy is AZ31, and the nano-titanium alloy is TC4.

[0022] Preferably, the mass ratio of AZ31 to TC4 is 98.5-99.8:0.2-1.5.

[0023] Preferably, the particle size of the magnesium alloy is 30 to 70 μm, and the particle size of the nano-titanium alloy is 40 to 80 nm.

[0024] In an optional embodiment, the preparation of the mixed powder comprises placing the magnesium alloy and the aluminum alloy in a dispersion solvent, ultrasonically mixing the mixture, and then drying the mixture.

[0025] Preferably, the ultrasonic parameters include: ultrasonic power of 100-300W, ultrasonic frequency of 10k-20kHz, and ultrasonic duration of 5-20min.

[0026] Preferably, the ultrasonic parameters include: ultrasonic power of 100-150W, ultrasonic frequency of 15k-20kHz, and ultrasonic duration of 8-12min.

[0027] More preferably, the ultrasound parameters include: ultrasound power of 100 W, ultrasound frequency of 20 kHz, and ultrasound duration of 10 min.

[0028] Preferably, the drying oven temperature during drying is 40-60° C., and the drying time is 40-60 min.

[0029] Preferably, the dispersion solvent includes any one of acetone, ethanol and methanol.

[0030] In a second aspect, the present invention provides a magnesium-titanium alloy prepared by the preparation method of any one of the aforementioned embodiments.

[0031] In an optional embodiment, the magnesium-titanium alloy has a tensile strength of ≥285 MPa, an elongation of ≥7.0%, and a grain size of 2-6 μm.

[0032] In a third aspect, the present invention provides a magnesium-titanium alloy prepared by the preparation method according to any one of the aforementioned embodiments, or the use of the magnesium-titanium alloy according to the aforementioned embodiments in the field of mechanical equipment materials.

[0033] The present invention has the following beneficial effects:

[0034] The present invention provides a magnesium-titanium alloy, its preparation method, and its application. By adding nano-titanium alloy to the magnesium alloy and combining it with spark plasma sintering, the resulting magnesium-titanium alloy has finer and more uniform grains, inhibiting grain growth and refining the grains. The sintered preform is then hot-extruded. The hot-extruded deformed material has a more uniform structure, reduces microscopic defects, and improves the strength of the magnesium-titanium alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 This is a scanning electron microscope image of the magnesium-titanium alloy provided in Example 1 of the present invention;

[0037] Figure 2 This is a scanning electron microscope image of the magnesium-titanium alloy provided in Comparative Example 1 of the present invention. DETAILED DESCRIPTION

[0038] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer are used. Where the manufacturer of the reagents or instruments is not specified, all are conventional products that can be purchased commercially.

[0039] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0040] In a first aspect, the present invention provides a method for preparing a magnesium-titanium alloy, comprising spark plasma sintering a mixed powder obtained by mixing a magnesium alloy and a nano-titanium alloy, and then hot extruding the sintered magnesium-titanium alloy preform.

[0041] Magnesium alloy has low density, high specific strength and specific stiffness. If it can be widely used in industries such as industrial manufacturing and transportation, it can not only significantly reduce the weight of industrial machinery and vehicles, improve their maneuverability, but also achieve energy conservation and emission reduction. However, the strength of magnesium alloy is relatively low compared to steel materials, and its plasticity is relatively poor, which greatly reduces the mechanical properties of magnesium alloy. Therefore, the inventor creatively proposed to use nano-titanium alloy to mix with magnesium alloy to prepare magnesium-titanium alloy. By adding nano-titanium alloy to magnesium alloy and combining it with the method of spark plasma sintering, the prepared magnesium-titanium alloy has finer and more uniform grains, achieving the effect of inhibiting grain growth and refining grains. The sintered preform is then hot-extruded. The material structure after hot extrusion deformation is more uniform, the microscopic defects of the material are reduced, and the strength of the magnesium-titanium alloy is improved.

[0042] In an optional embodiment, the parameters of spark plasma sintering include: a sintering temperature of 500-560°C, a sintering holding time of 3-10 minutes, a sintering pressure of 30-50 MPa, and a sintering rate of 80-120°C / min. By controlling the above sintering parameters, the mechanical properties of the magnesium-titanium alloy can be better controlled. If the sintering temperature is too low, the preform obtained by sintering will not be fully dense, and there will be some large and obvious pores and holes, which will affect the mechanical properties of the final product. If the sintering temperature is too high, energy consumption will increase and the mechanical properties of the product cannot be further improved. Therefore, it is more appropriate to control the sintering temperature within the above range. When the sintering holding time is too short, the preform tissue distribution will be uneven and the thermal stability will be poor; when the sintering pressure is too low, the preform obtained by sintering will not be completely dense and will have many defects such as pores; when the sintering rate is too high, the temperature control during the heating process will be inaccurate; when the sintering rate is too low, the time spent on the sintering process will be increased and the mechanical properties of the product cannot be further improved. Therefore, it is more appropriate to keep the sintering rate within the above range.

[0043] Preferably, the sintering temperature is 520-540° C., the sintering holding time is 4-6 min, the sintering pressure is 35-45 MPa, and the sintering rate is 90-110° C. / min.

[0044] Preferably, the sintering temperature is 530° C., the sintering holding time is 5 min, the sintering pressure is 40 MPa, and the sintering rate is 100° C. / min.

[0045] Preferably, after sintering, the preform is cooled to room temperature in the furnace.

[0046] In an optional embodiment, spark plasma sintering is performed under vacuum conditions with a vacuum degree of ≤1×10 -2 Controlling the vacuum degree during the sintering process within the above range can not only prevent the oxidation of the nano-titanium alloy during the sintering process, but also effectively ensure the normal progress of the sintering work, the sintering efficiency and the quality of the sintered product.

[0047] Preferably, before sintering, the mixed powder is placed in a mold and then spark plasma sintering is performed.

[0048] Preferably, the amount of mixed powder loaded into the mold each time is 80-100 g. In order to ensure that the mixed powder is evenly distributed in the mold without gaps, the mixed powder can be added in batches, and the amount added each time can be slightly adjusted according to different molds.

[0049] Preferably, in order to ensure that the sintering process of the magnesium-titanium alloy is stable, safe, and free of impurities, the mold is made of graphite.

[0050] In an optional embodiment, hot extrusion parameters include: an extrusion temperature of 300-400°C, an extrusion ratio of 25:1-4:1, and an extrusion rate of 4-8 mm / s. By controlling the extrusion parameters within these ranges, a magnesium-titanium alloy with a more uniform microstructure can be obtained, defects in the alloy can be reduced, and the mechanical properties of the alloy can be improved.

[0051] Preferably, the extrusion temperature is 340-360° C., the extrusion ratio is 20:1-12:1, and the extrusion rate is 5-7 mm / s.

[0052] Preferably, the extrusion temperature is 350° C., the extrusion ratio is 16:1, and the extrusion rate is 6 mm / s.

[0053] In an optional embodiment, the preform is heated and held in a resistance furnace before hot extrusion. Since the sintered preform needs to be cooled to room temperature before processing, preheating is necessary to ensure the integrity of the magnesium-titanium alloy's microstructure during hot extrusion. This ensures the preform has a certain degree of extrusion toughness and prevents brittle fracture, which can affect the quality of the final product.

[0054] Preferably, the heating temperature is 300-400°C and the holding time is 15-30 minutes;

[0055] Preferably, in order to prevent oxidation of the titanium alloy, the atmosphere in the resistance furnace is an inert atmosphere, which includes nitrogen or argon.

[0056] In an optional embodiment, the magnesium alloy includes any one of AZ31, AZ80M and AZ91D, and the nano-titanium alloy includes any one of TC4, TC6 and TC17; preferably, the magnesium alloy is AZ31, and the nano-titanium alloy is TC4.

[0057] Preferably, the mass ratio of AZ31 to TC4 is 98.5-99.8:0.2-1.5. Controlling the amount of AZ31 magnesium alloy and nano-TC4 titanium alloy within the above range can effectively ensure the grain size refinement and good mechanical properties of the magnesium-titanium alloy.

[0058] Preferably, the particle size of the magnesium alloy is 30 to 70 μm, and the particle size of the nano-titanium alloy is 40 to 80 nm. By controlling the particle size of the nano-titanium alloy within the above range and combining it with the spark plasma sintering method, grain growth can be suppressed and the mechanical properties of the product can be improved.

[0059] In an optional embodiment, the preparation of the mixed powder comprises placing the magnesium alloy and the aluminum alloy in a dispersion solvent, ultrasonically mixing the mixture, and then drying the mixture.

[0060] Preferably, the ultrasonic parameters include: ultrasonic power of 100-300W, ultrasonic frequency of 10k-20kHz, and ultrasonic duration of 5-20min.

[0061] Preferably, the ultrasonic parameters include: ultrasonic power of 100-150W, ultrasonic frequency of 15k-20kHz, and ultrasonic duration of 8-12min.

[0062] More preferably, the ultrasound parameters include: ultrasound power of 100 W, ultrasound frequency of 20 kHz, and ultrasound duration of 10 min.

[0063] Preferably, the drying oven temperature during drying is 40-60° C., and the drying time is 40-60 min.

[0064] Preferably, the dispersion solvent includes any one of acetone, ethanol and methanol.

[0065] In a second aspect, the present invention provides a magnesium-titanium alloy prepared by the preparation method of any one of the aforementioned embodiments.

[0066] In an optional embodiment, the magnesium-titanium alloy has a tensile strength of ≥285 MPa, an elongation of ≥7.0%, and a grain size of 2 to 6 μm. The magnesium-titanium alloy provided by the present invention has advantages such as good mechanical properties and a fine grain size, as well as high hardness, high strength, good toughness, good density, and few defects.

[0067] In a third aspect, the present invention provides a magnesium-titanium alloy prepared by the preparation method according to any one of the aforementioned embodiments, or the use of the magnesium-titanium alloy according to the aforementioned embodiments in the field of mechanical equipment materials.

[0068] Example 1

[0069] This embodiment provides a method for preparing a magnesium-titanium alloy, comprising the following steps:

[0070] S01. Mix AZ31 powder and nano-TC4 powder in a mass ratio of 99:1. Add the mixed powder to a 500ml beaker and add 100ml of acetone. Then, perform ultrasonic dispersion. The ultrasonic power is 100W, the ultrasonic frequency is 20kHz, and the ultrasonic duration is 10 minutes. After the ultrasonication, air dry the mixture in a drying oven at 50°C for 60 minutes to obtain a mixed powder.

[0071] The particle size of AZ31 powder is 55 μm, and the particle size of nano TC4 powder is 60 nm.

[0072] S02, weigh 90g of the mixed powder obtained in step S01, place it in a graphite mold, and place it in a spark plasma sintering furnace, evacuate to 1×10 -2 Pa below, and sintering treatment is performed.

[0073] The sintering heating rate is 100° C. / min, the sintering pressure is 40 MPa, the sintering temperature is 520° C., and the temperature is kept for 5 minutes. Then, the preform is cooled to room temperature with the furnace to obtain a sintered magnesium-titanium alloy preform.

[0074] S03. Place the preform obtained in step S02 into a resistance furnace, flush high-purity argon (purity ≥ 99.99%) into the furnace to form a protective atmosphere, heat to 350° C. and keep warm for 30 minutes.

[0075] The preform is then taken out of the resistance furnace and placed in an extruder for hot extrusion, wherein the extrusion temperature is 350° C., the extrusion ratio is 16:1, and the extrusion rate is 6 mm / s. Upon completion of the hot extrusion, the magnesium-titanium alloy is obtained.

[0076] The magnesium-titanium alloy prepared in the embodiment was placed under a scanning electron microscope for observation, and the following Figure 1 The results shown by Figure 1It can be seen that the magnesium-titanium alloy prepared in this embodiment has fine grains and high density, and thus can obtain better mechanical properties.

[0077] Example 2

[0078] This embodiment provides a method for preparing a magnesium-titanium alloy, comprising the following steps:

[0079] S01. Mix AZ31 powder and nano-TC4 powder in a mass ratio of 99.5:0.5. Add the mixed powder to a 500ml beaker and add 100ml of acetone. Then, perform ultrasonic dispersion. The ultrasonic power is 100W, the ultrasonic frequency is 20kHz, and the ultrasonic duration is 5 minutes. After the ultrasonication, air dry the mixture in a drying oven at 50°C for 60 minutes to obtain a mixed powder.

[0080] The particle size of AZ31 powder is 55 μm, and the particle size of nano TC4 powder is 60 nm.

[0081] S02, weigh 85g of the mixed powder obtained in step S01, place it in a graphite mold, and place it in a spark plasma sintering furnace, evacuate to 1×10 -2 Pa below, and sintering treatment is performed.

[0082] The sintering temperature rise rate is 100° C. / min, the sintering pressure is 30 MPa, the sintering temperature is 500° C., and the temperature is kept for 3 minutes. Then, the preform is cooled to room temperature with the furnace to obtain a sintered magnesium-titanium alloy preform.

[0083] S03. Place the preform obtained in step S02 into a resistance furnace, flush high-purity argon (purity ≥ 99.99%) into the furnace to form a protective atmosphere, heat to 350° C. and keep warm for 30 minutes.

[0084] The preform is then taken out of the resistance furnace and placed in an extruder for hot extrusion, wherein the extrusion temperature is 350° C., the extrusion ratio is 16:1, and the extrusion rate is 6 mm / s. Upon completion of the hot extrusion, the magnesium-titanium alloy is obtained.

[0085] Example 3

[0086] This embodiment provides a method for preparing a magnesium-titanium alloy, comprising the following steps:

[0087] S01. Mix AZ31 powder and nano-TC4 powder in a mass ratio of 98.5:1.5. Add the mixed powder to a 500ml beaker and add 100ml of acetone. Then, perform ultrasonic dispersion. The ultrasonic power is 100W, the ultrasonic frequency is 20kHz, and the ultrasonic duration is 15 minutes. After the ultrasonication, air dry the mixture in a drying oven at 50°C for 60 minutes to obtain a mixed powder.

[0088] The particle size of AZ31 powder is 55 μm, and the particle size of nano TC4 powder is 60 nm.

[0089] S02, weigh 95g of the mixed powder obtained in step S01, place it in a graphite mold, and place it in a spark plasma sintering furnace, evacuate to 1×10 -2 Pa below, and sintering treatment is performed.

[0090] The sintering heating rate is 100°C / min, the sintering pressure is 35 MPa, the sintering temperature is 550°C, and the temperature is kept for 7 minutes. Then, the preform is cooled to room temperature with the furnace to obtain a sintered magnesium-titanium alloy preform.

[0091] S03. Place the preform obtained in step S02 into a resistance furnace, flush high-purity argon (purity ≥ 99.99%) into the furnace to form a protective atmosphere, heat to 350° C. and keep warm for 30 minutes.

[0092] The preform is then taken out of the resistance furnace and placed in an extruder for hot extrusion, wherein the extrusion temperature is 350° C., the extrusion ratio is 16:1, and the extrusion rate is 6 mm / s. Upon completion of the hot extrusion, the magnesium-titanium alloy is obtained.

[0093] Comparative Example 1

[0094] This comparative example provides a method for preparing a magnesium-titanium alloy, and the steps are similar to those of Example 1, except that the mass ratio of AZ31 powder to nano-TC4 powder is 100:0.

[0095] The magnesium-titanium alloy prepared in this comparative example was placed under a scanning electron microscope for observation, and the following Figure 2 The results shown by Figure 2 It can be seen that compared with Example 1 of the present invention, Figure 2 The magnesium-titanium alloy has large grains, poor density and poor mechanical properties.

[0096] Comparative Example 2

[0097] This comparative example provides a method for preparing a magnesium-titanium alloy, the steps of which are similar to those of Example 1, except that the mass ratio of AZ31 powder to nano-TC4 powder is 100:0, and the SO3 step is not included, and the magnesium-titanium alloy is directly sintered.

[0098] Comparative Example 3

[0099] This comparative example provides a method for preparing a magnesium-titanium alloy, and the steps are similar to those of Example 1, except that the S03 step is not included, and the magnesium-titanium alloy is directly sintered to form the alloy.

[0100] Comparative Example 4

[0101] This comparative example provides a method for preparing a magnesium-titanium alloy, the steps of which are similar to those of Example 1, except that the particle size of the TC4 powder is 1 μm.

[0102] Comparative Example 5

[0103] This comparative example provides a method for preparing a magnesium-titanium alloy, and the steps are similar to those of Example 1, except that the mass ratio of AZ31 powder to nano-TC4 powder is 95:5.

[0104] Comparative Example 6

[0105] This comparative example provides a method for preparing a magnesium-titanium alloy, the steps of which are similar to those of Example 1, with the only difference being that the sintering temperature in step S02 is 480°C.

[0106] Test Example 1

[0107] The magnesium-titanium alloys prepared in Examples 1 to 3 and Comparative Examples 1 to 6 were tested. The density of the magnesium-titanium alloys was tested using the water displacement method. The tensile strength and elongation of the magnesium-titanium alloys were tested using the room temperature tensile test method for metal materials. The results are shown in Table 1.

[0108] Table 1 Properties of magnesium-titanium alloy

[0109]

[0110]

[0111] As shown in Table 1, the high-performance magnesium-titanium alloy prepared using the method and formulation of the present invention exhibits significantly improved tensile strength and elongation, significantly refined grain size, and high density. The high-performance magnesium-titanium alloy prepared by the present invention exhibits uniform composition distribution and lacks defects, making it suitable for the manufacture of small precision machines.

[0112] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for preparing a magnesium-titanium alloy, characterized in that: The method comprises the following steps: performing spark plasma sintering on a mixed powder obtained by mixing a magnesium alloy and a nano-titanium alloy, and then hot extruding the sintered magnesium-titanium alloy preform; The magnesium alloy is AZ31, and the nano-titanium alloy is TC4; the mass ratio of AZ31 to TC4 is 98.5-99.8:0.2-1.5; the particle size of the nano-titanium alloy is 40-80 nm; The parameters of the spark plasma sintering include: sintering temperature of 500-560°C, sintering holding time of 3-10 min, sintering pressure of 30-50 MPa, and sintering rate of 80-120°C / min; The spark plasma sintering is carried out under vacuum conditions, with a vacuum degree of ≤1×10 -2 Pa; The parameters of the hot extrusion include: an extrusion temperature of 300-400° C., an extrusion ratio of 25:1-4:1, and an extrusion rate of 4-8 mm / s.

2. The preparation method according to claim 1, characterized in that The sintering temperature is 520~540℃, the sintering holding time is 4~6min, the sintering pressure is 35~45MPa, and the sintering rate is 90~110℃ / min.

3. The preparation method according to claim 1, characterized in that The sintering temperature is 530°C, the sintering holding time is 5 minutes, the sintering pressure is 40 MPa, and the sintering rate is 100°C / min.

4. The preparation method according to claim 2, characterized in that Before the sintering, the mixed powder is placed in a mold and then spark plasma sintering is performed.

5. The preparation method according to claim 4, characterized in that The amount of mixed powder loaded into the mold each time is 80~100g.

6. The preparation method according to claim 4 or 5, characterized in that The material of the mold is graphite.

7. The preparation method according to claim 1, characterized in that The extrusion temperature is 340~360℃, the extrusion ratio is 20:1~12:1, and the extrusion rate is 5~7mm / s.

8. The preparation method according to claim 1, characterized in that The extrusion temperature is 350°C, the extrusion ratio is 16:1, and the extrusion rate is 6 mm / s.

9. The preparation method according to claim 1, characterized in that The method also includes placing the preform in a resistance furnace for heating and keeping the temperature before hot extrusion.

10. The preparation method according to claim 9, characterized in that The heating temperature is 300-400° C., and the holding time is 15-30 minutes.

11. The preparation method according to claim 9 or 10, characterized in that: The atmosphere in the resistance furnace is an inert atmosphere, and the inert atmosphere includes nitrogen or argon.

12. The preparation method according to claim 1, characterized in that The particle size of the magnesium alloy is 30-70 μm.

13. The preparation method according to claim 1 or 12, characterized in that: The preparation of the mixed powder comprises placing the magnesium alloy and the aluminum alloy in a dispersion solvent, ultrasonically mixing the mixture, and then drying the mixture.

14. The preparation method according to claim 13, characterized in that Ultrasonic parameters include: ultrasonic power of 100~300W, ultrasonic frequency of 10k~20kHz, and ultrasonic duration of 5~20min.

15. The preparation method according to claim 13, characterized in that Ultrasonic parameters include: ultrasonic power of 100~150W, ultrasonic frequency of 15k~20kHz, and ultrasonic duration of 8~12min.

16. The preparation method according to claim 13, characterized in that The ultrasound parameters include: ultrasound power of 100 W, ultrasound frequency of 20 kHz, and ultrasound duration of 10 min.

17. The preparation method according to claim 13, characterized in that The drying oven temperature during drying is 40~60℃ and the drying time is 40~60min.

18. The preparation method according to claim 13, characterized in that The dispersion solvent includes any one of acetone, ethanol and methanol.

19. A magnesium-titanium alloy, characterized in that: Prepared by the preparation method according to any one of claims 1 to 18.

20. The magnesium-titanium alloy according to claim 19, characterized in that The magnesium-titanium alloy has a tensile strength of ≥285 MPa, an elongation of ≥7.0%, and a grain size of 2-6 μm.

21. Use of the magnesium-titanium alloy prepared by the preparation method according to any one of claims 1 to 18 or the magnesium-titanium alloy according to claim 19 or 20 in the field of mechanical equipment materials.

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