Novel high-hardness Mg-Al-Ti alloy as well as preparation method and application thereof

Abstract

The invention discloses a novel high-hardness Mg-Al-Ti alloy as well as a preparation method and application thereof. The novel high-hardness Mg-Al-Ti alloy comprises an Mg element, an Al element and a Ti element, and the mass fraction of the Mg element is 30%-50% by weight, the mass fraction of the Al element is 30%-50% by weight, and the mass fraction of the Ti element is 8%-20% by weight. The preparation method comprises the following steps: uniformly grinding raw materials containing an Mg element, an Al element and a Ti element, and pressing into a blank body; the preparation method comprises the following steps: preparing a blank body, heating the blank body to a temperature required by sintering in an inert atmosphere at a heating rate of 4-5 DEG C / min, a temperature required by sintering of 410-435 DEG C and a sintering time of 1-1.5 h, and carrying out in-situ sintering on the blank body to prepare the novel high-hardness Mg-Al-Ti alloy, with the heating rate of 4-5 DEG C / min, the sintering temperature of 410-435 DEG C and the sintering time of 1-1.5 h. The high-hardness novel Mg-Al-Ti alloy provided by the invention is high in density, uniform in component and excellent in mechanical property, and can be widely applied to the fields of aerospace, automobile traffic and electronic products.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of alloys, and particularly relates to a new Mg-Al-Ti alloy with high hardness and a preparation method and application thereof. BACKGROUND

[0002] With the development of metal materials and the demand for lightweight, magnesium alloys and their composites are concerned due to their rich resources, low cost, and advantages such as low density, high specific stiffness, and high specific strength, and have been applied in the fields of aerospace, automobile manufacturing, etc. Currently, common magnesium alloys are mainly AZ series, ZK series, AM series, and rare earth magnesium alloys, but their relatively low elastic modulus, poor wear resistance, and poor corrosion resistance limit the further application and promotion of magnesium alloys. Meanwhile, the common preparation methods of magnesium alloys mainly include casting, additive manufacturing, and powder metallurgy, etc. The magnesium alloy materials prepared by casting are prone to have uneven internal organizational structure, coarse grains, composition segregation, and other phenomena, which lead to reduced performance. Although additive manufacturing can prepare materials with uniform and fine organizational structure and good performance, the complex process flow and high cost limit the application. Moreover, due to the large difference in density between magnesium and titanium, titanium is prone to sink to the bottom during casting preparation, leading to uneven dispersion, which results in insufficient mechanical properties and hardness (Vickers hardness value is lower than 70) of the magnesium alloy materials, and cannot meet the demand of structural materials in more fields.

[0003] The existing alloys prepared by casting have coarse grains and composition segregation, which leads to reduced performance. Moreover, due to the large difference in density between magnesium and titanium, titanium is prone to sink to the bottom during production, leading to uneven dispersion, which limits the improvement of the mechanical properties-hardness of magnesium-based alloys, and affects the further popularization and application of the materials. The preparation process of casting and current additive manufacturing is complex and has high cost, and the improvement of mechanical properties such as hardness is limited, which requires higher production conditions and takes a long time.

[0004] To solve this problem, the preparation technology can be optimized, and alloy elements or reinforcing bodies can be introduced to achieve obvious improvement. There are extensive studies on introducing SiC, AlN, or Y2O3 reinforcing bodies into various magnesium alloys to improve the room temperature mechanical properties of magnesium alloys, but the existing technology basically uses physical mixing dispersion reinforcement to introduce reinforcing bodies. The reinforcing bodies and the matrix material are simply mixed or form a solid solution, that is, the bonding force between them is weak, and there is a large internal stress on the contact interface, which leads to the decline of the overall mechanical properties of the material and the relatively low hardness. SUMMARY

[0005] The main purpose of the present application is to provide a new Mg-Al-Ti alloy with high hardness and a preparation method and application thereof to overcome the shortcomings of the prior art.

[0006] To achieve the foregoing purposes, the technical solutions adopted by the present application include: The first aspect of the present application provides a high-hardness novel Mg-Al-Ti alloy, which comprises Mg elements, Al elements and Ti elements, the mass fraction of the Mg elements is 30-50wt%, the mass fraction of the Al elements is 30-50wt%, and the mass fraction of the Ti elements is 8-20wt%.

[0007] The second aspect of the present application provides a preparation method of the high-hardness novel Mg-Al-Ti alloy, which comprises the following steps: After uniformly grinding raw materials containing Mg elements, raw materials containing Al elements and raw materials containing Ti elements, the raw materials are pressed into a blank; The blank is in-situ sintered by heating to a required sintering temperature in an inert atmosphere, wherein the heating rate is 4-5℃ / min, the required sintering temperature is 410-435℃, and the sintering time (also referred to as the holding time) is 1-1.5h, so as to obtain the high-hardness novel Mg-Al-Ti alloy.

[0008] The third aspect of the present application provides the high-hardness novel Mg-Al-Ti alloy prepared by the preparation method.

[0009] The fourth aspect of the present application provides applications of the high-hardness novel Mg-Al-Ti alloy in the fields of aerospace, automobile transportation and electronic products.

[0010] Compared with the prior art, the present application has at least the following beneficial effects: (1) The high-hardness novel Mg-Al-Ti alloy provided by the present application has high density, uniform composition and excellent mechanical properties.

[0011] (2) The preparation method of the high-hardness novel Mg-Al-Ti alloy provided by the present application utilizes mechanical ball milling in-situ sintering and powder metallurgy process to prepare a series of high-hardness novel Mg-Al-Ti alloys with uniform composition, and through optimization of the preparation process, the hardness and related mechanical properties of the alloy material are greatly improved, and the balance between alloy performance and manufacturing cost is maximized; and the required raw materials are rich in content and low in cost.

[0012] (3) The preparation method of the high-hardness novel Mg-Al-Ti alloy provided by the present application utilizes Al intermediate phase to form magnesium-aluminum alloy and titanium-aluminum intermetallic compound, thereby realizing in-situ synthesis of reinforcing body material and more chemical bond enhancement, greatly reducing the internal stress of the material, and realizing a great improvement in the mechanical properties of the material, especially in the aspect of hardness. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only represent some of the embodiments described in the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0014] Figure 1 is a hardness curve of the Mg-Al-Ti alloy of the embodiment 1 of the present application with the change of the heating rate; Figure 2 is a hardness curve of the Mg-Al-Ti alloy of the embodiment 1 of the present application with the change of the sintering time; Figure 3 is an XRD curve of the Mg-Al-Ti alloy of the embodiment 1 of the present application with the change of the sintering temperature; Figure 4 is a relative density and hardness curve of the Mg-Al-Ti alloy of the embodiment 1 of the present application with the change of the sintering temperature; Figure 5 is a stress-strain curve of the Mg-Al-Ti alloy of the embodiment 1 of the present application with the change of the sintering temperature; Figure 6 is a metallographic graph of the Mg-Al-Ti alloy of the embodiment 1 of the present application; Figure 7 is an EBSD grain boundary analysis graph of the Mg-Al-Ti alloy of the embodiment 1 of the present application. DETAILED DESCRIPTION

[0015] In view of the problems in the prior art described above, through extensive and in-depth research by the inventors of the present application, a new Mg-Al-Ti alloy with high hardness and a preparation method and application thereof are provided. The new Mg-Al-Ti alloy with uniform composition is prepared by mechanical ball milling and in-situ sintering and powder metallurgy, and the hardness and related mechanical properties of the magnesium-based alloy material are greatly improved through optimization of the preparation process, and the alloy performance and manufacturing cost are maximally balanced.

[0016] In the present application, hard metal Ti particles are ideal choices for achieving high strength and high hardness of magnesium alloy due to their high melting point, high Young's modulus, and coherent lattice relationship with Mg. Meanwhile, the powder metallurgy method of consolidating raw material powders and then sintering can successfully avoid the performance reduction caused by grain coarsening, loose structure, and composition unevenness, and has the advantages of simple process and low cost. The key step of the sintering process mainly includes two interrelated mechanisms of densification and grain growth, and both are affected by the thermal diffusion process. Thermal diffusion, i.e. grain boundary diffusion and volume diffusion, plays a role in mass transfer and significantly promotes the development and enhancement of grain interface bonding in the sintering process, thereby affecting the microstructure and performance of the material. The sintering temperature and diffusion rate can be represented by the Arrhenius equation , where D is the diffusion coefficient, which is the core parameter representing the diffusion rate; D0, Q, R, and T are the frequency factor, diffusion activation energy, gas constant, and absolute temperature, respectively. Therefore, it can be found that the sintering temperature is closely related to the thermal diffusion rate, and too high or too low sintering temperature or too long or too short sintering time can reduce the performance of the material. At the same time, factors such as heating rate and sintering time will affect the inter-particle diffusion and grain growth during sintering, which are key factors determining the densification degree and performance of the material. Therefore, the present application adjusts these factors to make the microstructure and mechanical properties of the synthesized material reach the most ideal state.

[0017] The technical scheme, implementation process and principles thereof will be further explained as follows.

[0018] The first aspect of the present application provides a new high-hardness Mg-Al-Ti alloy, which comprises Mg element, Al element and Ti element, the mass fraction of the Mg element is 30-50wt%, the mass fraction of the Al element is 30-50wt%, and the mass fraction of the Ti element is 8-20wt%.

[0019] In some embodiments, the phase composition in the new high-hardness Mg-Al-Ti alloy comprises Al 12 Mg 17 , Al3Ti and AlTi3.

[0020] In some embodiments, the grain size in the new high-hardness Mg-Al-Ti alloy is 1-15um.

[0021] In some embodiments, the density of the new high-hardness Mg-Al-Ti alloy is 2.90-2.98g / cm 3 .

[0022] In some embodiments, the density of the new high-hardness Mg-Al-Ti alloy is 2.90-2.98g / cm 3 .

[0023] In some embodiments, the high-hardness new Mg-Al-Ti alloy has a Vickers hardness of 143-174 HV.

[0024] In some embodiments, the high-hardness new Mg-Al-Ti alloy has a compressive strength of 300-380 MPa.

[0025] A second aspect of the present application provides a preparation method of a high-hardness new Mg-Al-Ti alloy, comprising: grinding raw materials containing Mg elements, raw materials containing Al elements, and raw materials containing Ti elements uniformly, and then pressing into a green body; heating to a sintering temperature in an inert atmosphere, and then in-situ sintering the green body to obtain the high-hardness new Mg-Al-Ti alloy, wherein the heating rate is 4-5 ℃ / min, the sintering temperature is 410-435 ℃, and the sintering time is 1-1.5 h.

[0026] In some embodiments, the preparation method of the high-hardness new Mg-Al-Ti alloy specifically comprises: grinding raw materials containing Mg elements, raw materials containing Al elements, and raw materials containing Ti elements uniformly by using a ball milling process, and then pressing the green body by using an oil pressure process.

[0027] Further, the process parameters in the ball milling process are: the rotation speed is 300-600 rpm, the ball-to-material ratio is 3:1-10:1, and the ball milling time is 300-640 min.

[0028] Further, the process parameters in the oil pressure process are: the oil pressure is 35-60 MPa, and the pressure holding time is 20-40 min.

[0029] Further, the raw materials containing Mg elements comprise magnesium powder, and the magnesium powder comprises magnesium single substance with a purity of 99%.

[0030] Further, the raw materials containing Al elements comprise aluminum powder, and the aluminum powder comprises aluminum single substance with a purity of 99%.

[0031] Further, the raw materials containing Ti elements comprise titanium powder, and the titanium powder comprises titanium single substance with a purity of 99%.

[0032] Further, the inert atmosphere comprises argon or helium.

[0033] Further, the preparation method further comprises: polishing and polishing the sintered alloy sample to obtain the high-hardness new Mg-Al-Ti alloy.

[0034] In some more specific embodiments, the method for preparing the high-hardness novel Mg-Al-Ti alloy can comprise the following steps: S1, the raw material containing Mg element, the raw material containing Al element and the raw material containing Ti element are put into a planetary ball mill for mixing ball milling, forward rotation for 20 min, pause for 30 s, reverse rotation for 20 min, to obtain a mixed powder; wherein the rotation speed is 300-600 rpm, the ball-to-material ratio is 3:1-10:1, and the ball milling time is 300-640 min.

[0035] S2, the mixed powder is put into a mold and pressed into a green body by an oil press; wherein the process parameters in the oil pressing process are: the oil pressing pressure is 35-60 MPa, and the pressure holding time is 20-40 min.

[0036] S3, the green body is placed in an atmosphere sintering furnace under an inert atmosphere, heated to the required sintering temperature at a heating rate of 4-5 ℃ / min, and then in-situ sintered to obtain a sintered alloy sample, wherein the required sintering temperature is 410-435 ℃, and the sintering time is 1-1.5 h.

[0037] S4, after polishing and polishing the sintered alloy sample, the high-hardness novel Mg-Al-Ti alloy is prepared.

[0038] In the present application, in-situ sintering is a solid phase alloying reaction, and the specific reaction mechanism is: magnesium, aluminum and titanium are relatively uniformly mixed under mechanical ball milling, and after being pressed into a shape, magnesium and aluminum undergo solid phase alloying reaction under high temperature heating in an atmosphere furnace, mainly generating part of aluminum and most of MgAl 12 Mg 17 This alloying compound, while a small part of aluminum and titanium forms Al3Ti, AlTi3 and other intermetallic compounds under solid phase heating, and is uniformly distributed in the bulk alloy to form a stable reinforcing phase.

[0039] The third aspect of the present application provides a high-hardness novel Mg-Al-Ti alloy prepared by the preparation method.

[0040] The fourth aspect of the present application provides the application of the high-hardness novel Mg-Al-Ti alloy in the fields of aerospace, automobile transportation and electronic products.

[0041] In summary, the present application adopts a powder metallurgy preparation strategy, and by optimizing the sintering temperature, heating rate, sintering time and other process parameters, the heat diffusion rate and grain growth kinetics in the sintering process are precisely controlled, so that a high-hardness novel Mg-Al-Ti alloy with target performance is obtained.

[0042] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application. Those skilled in the art can modify or replace equivalently on the basis of understanding the technical scheme of the present application without departing from the spirit and scope of the present application, which should be covered within the protection scope of the present application.

[0043] If the specific experimental steps or conditions are not specified in the embodiments, the operation or conditions of the conventional experimental steps described in the literature in the art can be used. If the reagents or instruments are not specified by the manufacturer, they can be obtained by purchase. The commercial selection of the remaining raw materials and instruments not mentioned is a conventional selection, which does not involve the core technical means of the present application.

[0044] Embodiment 1 The present embodiment provides a preparation method of a new high-hardness Mg-Al-Ti alloy, which is specifically as follows: S1, 40 g of 99% pure magnesium powder, 50 g of 99% pure aluminum powder and 10 g of 99% pure titanium powder are put into a planetary ball mill for mixing and ball milling, with forward rotation for 20 min, pause for 30 s, and reverse rotation for 20 min, to obtain a mixed powder; wherein the rotation speed is 350 rpm, the ball-to-material ratio is 3:1, and the ball milling time is 600 min.

[0045] S2, the mixed powder is put into a mold and pressed into an embryo with a diameter of 2.5 cm and a height of 0.5 cm by using an oil press; wherein the process parameters in the oil pressing process are: oil pressure is 30 MPa, and pressure holding time is 10 min.

[0046] S3, under an inert atmosphere, the embryo is put into an atmosphere sintering furnace and a program is set, with the temperature rising at a rate of 3 ℃ / min, 3.5 ℃ / min, 4 ℃ / min, 4.5 ℃ / min and 5 ℃ / min to the required sintering temperature, and then the embryo is sintered in situ to obtain a sintered alloy sample, wherein the required sintering temperature is 415 ℃, and the sintering time (also referred to as holding time) is 1 h.

[0047] S4, after the sintered alloy sample is polished with sandpaper and diamond polished, the new high-hardness Mg-Al-Ti alloy is prepared.

[0048] The hardness test is tested by using a Vickers hardness tester, with a holding time of 10 min, 6 single sample pressure points, and the average value of the test results is taken.

[0049] The hardness test results are shown in Figure 1The hardness is 132 HV, 136 HV, 146 HV, 143 HV and 142 HV at the temperature increasing rate of 3 ℃ / min, 3.5 ℃ / min, 4 ℃ / min, 4.5 ℃ / min and 5 ℃ / min, respectively.

[0050] Comprehensive analysis of the performance of sintered samples at different temperature increasing rates shows that the preferred temperature increasing rate is 4-5 ℃ / min. The optimal temperature increasing rate is 4 ℃ / min.

[0051] The metallographic chart of the Mg-Al-Ti alloy prepared at the optimal temperature increasing rate of 4 ℃ / min is shown in FIG. 3. The phase distribution is uniform in the microscopic morphology under the metallographic microscope, the crystal boundary distribution is uniform, the grain size is relatively concentrated between 1-15 microns, and the alloy section presents a tough and protruding particle. The EBSD crystal boundary analysis chart is shown in FIG. 4. Figure 6 Figure 7

[0052] Example 2 The embodiment provides a preparation method of a new high-hardness Mg-Al-Ti alloy, and specifically as follows. S1, 35g of 99% pure magnesium powder, 50g of 99% pure aluminum powder and 15g of 99% pure titanium powder are put into a planetary ball mill for mixing and ball milling, and the forward rotation is 20 min, the pause is 30 s, and the reverse rotation is 20 min to obtain a mixed powder; wherein the rotation speed is 400 rpm, the ball-to-material ratio is 3:1, and the ball milling time is 720 min.

[0053] S2, the mixed powder is put into a mold, and an oil press is used to press into an embryo with a diameter of 2.5 cm and a height of 0.5 cm; wherein the process parameters in the oil pressing process are: the oil pressing pressure is 35 MPa, and the pressure maintaining time is 15 min.

[0054] S3, the embryo is put into an atmosphere sintering furnace under an inert atmosphere and is set a program, and the temperature is increased to the required sintering temperature at a temperature increasing rate of 3-5 ℃ / min, and then the embryo is sintered in situ to obtain a sintered alloy sample, wherein the required sintering temperature is 420 ℃, and the sintering time is 1 h, 1.5 h, 2.0 h, 2.5 h and 3.0 h, respectively.

[0055] S4, the sintered alloy sample is polished after grinding with sandpaper and diamond polishing to obtain the high-hardness new Mg-Al-Ti alloy. Then, the sample is characterized by XRD and mechanical property test.

[0056] The hardness test result is shown in Table 1. Figure 2 ​​Under sintering times of 1h, 1.5h, 2.0h, 2.5h, and 3.0h, the hardnesses were 174HV, 162HV, 157HV, 149HV, and 143HV, respectively.

[0057] Comparing the performance of sintered samples at different sintering times, a comprehensive analysis suggests that the optimal sintering time is 1–1.5 h, with the best sintering time being 1 h.

[0058] Example 3 This embodiment provides a method for preparing a novel high-hardness Mg-Al-Ti alloy, as detailed below: S1. Place 35g of 99% pure magnesium powder, 45g of 99% pure aluminum powder, and 20g of 99% pure titanium powder into a planetary ball mill for mixing and ball milling. Rotate forward for 20 minutes, pause for 30 seconds, and then rotate in reverse for 20 minutes to obtain mixed powder. The rotation speed is 500 rpm, the ball-to-powder ratio is 3:1, and the ball milling time is 800 minutes.

[0059] S2. The mixed powder is placed in a mold and pressed into a blank with a diameter of 2.5 cm and a height of 0.5 cm using a hydraulic press; wherein the process parameters in the hydraulic pressing process are: hydraulic pressure of 40 MPa and holding time of 15 min.

[0060] S3. Under an inert atmosphere, the blank is placed in an atmosphere sintering furnace and a program is set to heat it to the required sintering temperature at a heating rate of 3~5 ℃ / min. Then, the blank is sintered in situ to obtain sintered alloy samples. The required sintering temperatures are 385℃, 405℃, 415℃, 420℃, 425℃, and 430℃, and the sintering time is 1 h.

[0061] S4. The sintered alloy sample is polished with sandpaper and then with diamond polishing to obtain the high-hardness novel Mg-Al-Ti alloy.

[0062] Hardness test results are shown below Figure 3 At sintering temperatures of 385℃, 405℃, 415℃, 420℃, 425℃, and 430℃, the hardnesses were 151HV, 155HV, 168HV, 178HV, and 173HV, respectively. The relative densities were 0.93%, 0.94%, 0.96%, 0.98%, and 0.95%, respectively.

[0063] Comparing the performance of samples at different sintering temperatures, comprehensive analysis suggests that the optimal sintering temperature is 410~435℃, and the optimal sintering time is 420℃.

[0064] The relative density and hardness of the Mg-Al-Ti alloy in this embodiment as a function of sintering temperature are shown in the following graphs.Figure 4 as shown.

[0065] Comprehensive analysis of the performance of samples at different sintering temperatures, it is considered that the preferred sintering temperature is 410~435℃. The best sintering time is 420℃.

[0066] At room temperature and normal pressure, stress-strain test adopts universal testing machine to carry out tensile test, and Mg-Al-Ti alloy samples at different sintering temperatures are selected for testing. The stress-strain curve of the high-hardness new Mg-Al-Ti alloy prepared at different sintering temperatures is shown in Figure 5 It can be seen that the tensile strength of the material increases first and then decreases with the increase of the sintering temperature, and the tensile strength of the sample at 420℃ is the highest, which is 378MPa.

[0067] Aspects, embodiments, features, and examples of the present application should be considered illustrative in all aspects and are not intended to limit the present application, the scope of which is defined only by the claims. Those skilled in the art will understand other embodiments, modifications and uses without departing from the spirit and scope of the claimed application.

[0068] In addition, the present inventors have also carried out tests with other raw materials, process operations and process conditions described in the present specification with reference to the foregoing embodiments, and all have obtained relatively ideal results.

[0069] Although the present application has been described with reference to illustrative embodiments, those skilled in the art will understand that various other changes, omissions and / or additions can be made and elements of the described embodiments can be substituted with substantial equivalents without departing from the spirit and scope of the present application. In addition, many modifications can be made to adapt a particular situation or material to the teachings of the present application without departing from the scope thereof. Therefore, the present application is not intended to be limited to the disclosed specific embodiments for carrying out the present application, but is intended to encompass all embodiments falling within the scope of the appended claims.

Claims

1. A novel high-hardness Mg-Al-Ti alloy, characterized in that: The novel high-hardness Mg-Al-Ti alloy comprises Mg, Al, and Ti elements, wherein the mass fraction of Mg is 30-50 wt%, the mass fraction of Al is 30-50 wt%, and the mass fraction of Ti is 8-20 wt%.

2. The novel high-hardness Mg-Al-Ti alloy according to claim 1, characterized in that: The phase composition of the novel high-hardness Mg-Al-Ti alloy includes Al. 12 Mg 17 Al3Ti and AlTi3; And / or, the grain size in the novel high-hardness Mg-Al-Ti alloy is 1~15 μm; And / or, the density of the novel high-hardness Mg-Al-Ti alloy is 2.90-2.98 g / cm³. 3 .

3. The novel high-hardness Mg-Al-Ti alloy according to claim 1, characterized in that: The Vickers hardness of the novel high-hardness Mg-Al-Ti alloy is 143~174 HV; And / or, the compressive strength of the novel high-hardness Mg-Al-Ti alloy is 300~380 MPa.

4. A method for preparing a novel high-hardness Mg-Al-Ti alloy, characterized in that, include: After grinding the raw materials containing Mg, Al, and Ti elements evenly, they are pressed into a blank. In an inert atmosphere, the preform is heated to the required sintering temperature and sintered in situ to obtain a novel high-hardness Mg-Al-Ti alloy. The heating rate is 4~5℃ / min, the required sintering temperature is 410~435℃, and the sintering time is 1~1.5 h.

5. The preparation method according to claim 4, characterized in that, Specifically, it includes: The raw materials containing Mg, Al, and Ti are ball-milled until uniform, and then pressed using a hydraulic pressing process to obtain the preform.

6. The preparation method according to claim 5, characterized in that, The process parameters in the ball milling process are: rotation speed of 300~600 rpm, ball-to-material ratio of 3:1~10:1, and ball milling time of 300~640 min; And / or, the process parameters in the hydraulic process are: hydraulic pressure of 35~60 MPa and pressure holding time of 20~40 min.

7. The preparation method according to claim 5, characterized in that: The raw material containing Mg includes magnesium powder with a purity of 99%; And / or, the raw material containing Al includes aluminum powder with a purity of 99%; And / or, the raw material containing Ti element includes titanium powder with a purity of 99%.

8. The preparation method according to claim 4, characterized in that: The inert atmosphere includes argon and helium; And / or, the preparation method further includes: grinding and polishing the sintered alloy sample to obtain the high-hardness novel Mg-Al-Ti alloy.

9. A novel high-hardness Mg-Al-Ti alloy prepared by any one of claims 4-8.

10. The application of the high-hardness novel Mg-Al-Ti alloy according to any one of claims 1-3 or claim 9 in the fields of aerospace, automotive transportation, and electronic products.

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