Application method of magnesium-based amorphous alloy

Abstract

The invention provides a magnesium-based amorphous alloy application method. The magnesium-based amorphous alloy application method comprises the following steps: processing an amorphous master alloy ingot to form amorphous master alloy particles; in a vacuum environment, the amorphous mother alloy particles are heated to a molten state; and in a vacuum environment, the amorphous mother alloy particles in the molten state are injected into a mold at the set injection temperature to be cooled, solidified and formed, and the magnesium-based amorphous alloy product is obtained. The amorphous master alloy ingot is processed to form the amorphous master alloy particles, then the amorphous master alloy particles are melted in the vacuum environment and then are subjected to injection cooling forming, the accuracy of metal melt components in the injection forming process is guaranteed, molten metal transfer is not needed after melting, oxidation and air entrapment are avoided, one-time forming is achieved, and the production efficiency is improved. Therefore, the production efficiency and the product quality of the magnesium-based amorphous alloy product are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of amorphous alloys, and in particular relates to an application method of a magnesium-based amorphous alloy. Background Art

[0002] Amorphous alloys are usually prepared by rapid cooling. They do not have the long-range ordered internal atomic structure of traditional crystalline materials. Therefore, they exhibit advantages such as large elastic limit, high strength, high wear resistance, excellent soft magnetic properties and corrosion resistance. They have broad application prospects in many fields such as aerospace, precision instruments, and biomedicine.

[0003] Compared with traditional crystalline magnesium alloys, magnesium-based amorphous alloys have advantages such as higher strength, better corrosion resistance and biocompatibility. At present, the preparation methods of bulk amorphous alloys mainly include copper mold casting, powder sintering, additive manufacturing, etc. However, due to the active chemical properties of magnesium, it is difficult to prepare magnesium-based amorphous alloys using powder sintering and additive manufacturing. Therefore, the preparation method of magnesium-based amorphous alloys is mainly copper mold casting. The copper mold casting method is to inject the molten metal into the copper mold through a pressure difference under a vacuum environment to achieve rapid cooling. Due to the need for repeated vacuuming operations during the preparation process, the low injection pressure during the casting process, and the limited sample size, this method has the problems of low production efficiency and long production cycle, and the product quality is unstable and the loss rate is high, which limits the promotion and application of amorphous alloy products. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies in the prior art and to provide a method for applying a magnesium-based amorphous alloy, so as to improve the production efficiency and product quality of magnesium-based amorphous alloy products.

[0005] The present invention is achieved through the following technical solutions:

[0006] A magnesium-based amorphous alloy application method comprises the following steps: processing an amorphous master alloy ingot to form amorphous master alloy particles; heating the amorphous master alloy particles to a molten state in a vacuum environment; injecting the molten amorphous master alloy particles into a mold at a set injection temperature in the vacuum environment to cool and solidify the mold to obtain a magnesium-based amorphous alloy product.

[0007] In the magnesium-based amorphous alloy application method provided by the present invention, an amorphous master alloy ingot is processed into amorphous master alloy particles, which are then melted in a vacuum environment and injection-cooled to form, thereby ensuring the accuracy of the metal melt composition during the injection molding process. After melting, there is no need to transfer the molten metal, thus avoiding oxidation and air entrapment, and forming in one step, thereby improving the production efficiency and product quality of magnesium-based amorphous alloy products.

[0008] Furthermore, in the step of heating the amorphous master alloy particles to a molten state in a vacuum environment, the heating time is 1-3 hours. The heating time is controlled so that the amorphous master alloy particles form a molten state.

[0009] Furthermore, in the step of heating the amorphous master alloy particles to a molten state in a vacuum environment, the amorphous master alloy particles sequentially pass through a preliminary heating zone, a secondary heating zone, and an injection heating zone in a vacuum environment, wherein the heating temperature of the preliminary heating zone is a temperature at which the solid content of the magnesium-based amorphous alloy is 20%-40%, the heating temperature of the secondary heating zone is 5°C-10°C higher than the injection temperature, and the heating temperature of the injection heating zone is the injection temperature of the magnesium-based amorphous alloy. Since the alloy has a large viscosity after melting, in order to ensure smooth transportation of the amorphous master alloy particles during the heating process, the magnesium-based amorphous alloy is heated step by step, the amorphous master alloy particles first pass through the preliminary heating zone, and form a solid-liquid mixed phase with a solid content of 20%-40% under the heating of the preliminary heating zone, then enter the secondary heating zone for heating to fully melt the amorphous master alloy particles, and then enter the injection heating zone to reduce the temperature for injection. The temperature of the step-by-step heating needs to be controlled within an appropriate range. If the heating temperature of the initial heating zone is too high or too low, the melting degree of the master alloy particles will be too high or too low, which will lead to transportation difficulties; if the temperature of the secondary heating zone and the injection heating zone is too high, the high cooling rate requirement for obtaining amorphous structure cannot be achieved, resulting in crystallization of the product; if the temperature of the secondary heating zone and the injection heating zone is too low, it is easy to cause difficulty in melt filling.

[0010] Furthermore, in the step of heating the amorphous master alloy particles to a molten state in a vacuum environment, the amorphous master alloy particles are fed into a vacuum feeding chamber of an amorphous crystal phase product production device; the amorphous crystal phase product production device comprises a feeding pipe, a nozzle, a mold and a screw arranged in the feeding pipe, one end of the feeding pipe is provided with a feeding port, and the other end is provided with a discharging port, the discharging port is connected to the nozzle, the nozzle is connected to the mold, the feeding pipe and the screw form the vacuum feeding chamber; the feeding pipe is arranged along the The direction from the feed port to the discharge port is provided with a feeding preliminary heating section and a feeding secondary heating section in sequence, and the nozzle is provided with a nozzle secondary heating section and a nozzle injection heating section in sequence along the direction from the discharge port to the nozzle; the feeding preliminary heating section forms the preliminary heating zone, the feeding secondary heating section and the nozzle secondary heating section form the secondary heating zone, and the nozzle injection heating section forms the injection heating zone; in a vacuum environment, the amorphous master alloy particles are fed through the preliminary heating zone, the secondary heating zone and the injection heating zone in sequence by screw advancement. The shear disturbance of the screw is used to minimize the problem of component segregation, thereby improving the stability of the magnesium-based amorphous alloy. At the same time, the use of the screw advancement feeding can continuously extrude the amorphous master alloy particles, making them more compact and squeezing out the residual air inside, so that the structure of the prepared magnesium-based amorphous alloy is dense.

[0011] Furthermore, in the step of heating the amorphous master alloy particles to a molten state in a vacuum environment, the vacuum feeding chamber is evacuated and argon is introduced, and the amorphous master alloy particles are fed through the screw in the argon atmosphere through the preliminary heating zone, the secondary heating zone and the injection heating zone in sequence, and the pressure of the vacuum feeding chamber is (-0.05) Mpa-(-0.01) Mpa. Before heating, the vacuum is fully evacuated and high-purity argon is introduced to form a protective atmosphere, and the gas inside the amorphous master alloy particles is discharged by argon to minimize the influence of impurity atmospheres such as oxygen during the heating and remelting process.

[0012] Further, in a vacuum environment, the molten amorphous master alloy particles are injected into a mold at a set injection temperature to cool and solidify to obtain a magnesium-based amorphous alloy, and the injection temperature is 450° C. to 520° C. The injection temperature is controlled so that the magnesium-based amorphous alloy remains in a molten state when entering the mold and has an appropriate cooling time, and is cooled before crystallization to obtain an amorphous form.

[0013] Furthermore, in a vacuum environment, the molten amorphous master alloy particles are injected into a mold at a set injection temperature to cool and solidify to form a magnesium-based amorphous alloy, and the injection speed is 1.5-3m / s. The injection speed is controlled within an appropriate range. If the injection speed is too high, it is easy to cause flash and mold leakage, resulting in crystallization; if the injection speed is too low, the high cooling rate provided by the mold will cause the front end of the metal liquid to solidify prematurely, and the mold cannot be fully filled, resulting in problems such as material shortage.

[0014] Furthermore, in a vacuum environment, the molten amorphous master alloy particles are injected into a mold at a set injection temperature to cool and solidify to obtain a magnesium-based amorphous alloy, and the temperature of the mold is 25°C-80°C. The mold temperature and the injection temperature cooperate with each other in a suitable range to meet the high cooling rate requirements of the amorphous structure; if the mold temperature is too high, the high cooling rate requirements of the amorphous structure cannot be met, resulting in crystallization of the sample; if the mold temperature is too low, the cooling rate is too fast, which easily causes difficulty in filling the metal melt in the mold.

[0015] Further, in the step of processing the amorphous master alloy ingot to form amorphous master alloy particles, the amorphous master alloy ingot is prepared by mixing a magnesium block, a copper block and a pure magnesium-yttrium alloy according to the atomic ratio of the magnesium-based amorphous alloy, grinding the magnesium block, the copper block and the pure magnesium-yttrium alloy to remove surface oxides and impurities, cutting them into small pieces, mixing them, smelting them, and cooling them; the chemical expression of the magnesium-based amorphous alloy is Mg a Cu b Y c, where a+b+c=100, 60≤a≤70, 20≤b≤30, and the rest is c. When mixing materials, the materials are added according to the atomic number of the magnesium-based amorphous alloy. In actual production, the amount of magnesium burnout can be estimated to ensure that the accurate ratio can be obtained after magnesium burnout.

[0016] Furthermore, in the step of processing the amorphous master alloy ingot into amorphous master alloy particles, the amorphous master alloy particles are polished to remove oxides and impurities on the surface of the amorphous master alloy ingot, and are screened out using a screen after processing and crushing. The amorphous master alloy ingot is polished to remove the oxide layer on the surface to reduce the impurity content; the amorphous master alloy particles with a suitable particle size are screened out using a screen to ensure the stability of the heating and feeding process.

[0017] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of the magnesium-based amorphous alloy application method of Example 1.

[0019] Figure 2 This is the X-ray diffraction pattern of the amorphous alloy sample of Example 2.

[0020] Figure 3 It is the DSC curve diagram of the amorphous alloy sample of Example 2.

[0021] Figure 4 This is the X-ray diffraction pattern of the magnesium-based alloy material of Comparative Example 1.

[0022] Figure 5 This is the SEM image of the magnesium-based alloy material of Comparative Example 1.

[0023] Figure 6 This is the X-ray diffraction pattern of the magnesium-based alloy material of Comparative Example 2.

[0024] Figure 7 This is the X-ray diffraction pattern of the magnesium-based alloy material of Comparative Example 5. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention, rather than to limit the embodiments of the present invention. It is also necessary to explain that, for ease of description, only parts related to the embodiments of the present invention are shown in the accompanying drawings, rather than all structures.

[0026] In addition, the terms first, second, third, etc. in the specification and claims are only used for the purpose of describing the same technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, nor necessarily describing the order or time sequence. The terms are interchangeable where appropriate. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0027] Similarly, the terms "fixed" and "connected" used in the specification and claims should not be construed as limited to direct connection. Therefore, the expression "device A is connected to device B" should not be limited to a device or system in which device A is directly connected to device B, but means that there is a path between device A and device B, which may be a path including other devices or tools.

[0028] Example 1

[0029] This embodiment provides a magnesium-based amorphous alloy application method. Figure 1 is a flowchart, see Figure 1 The application method of the magnesium-based amorphous alloy comprises the following steps:

[0030] Step S1: processing an amorphous master alloy ingot into amorphous master alloy particles.

[0031] In step S1, the amorphous master alloy ingot is obtained by mixing magnesium blocks, copper blocks and pure magnesium-yttrium alloy according to the atomic number ratio of the magnesium-based amorphous alloy, grinding the magnesium blocks, copper blocks and pure magnesium-yttrium alloy to remove surface oxides and impurities, cutting them into small pieces, mixing them, smelting them, and cooling them. When mixing, the materials are added according to the atomic number of the magnesium-based amorphous alloy, and the magnesium burnout amount can be estimated in actual production to ensure that the accurate ratio can still be obtained after the magnesium burnout.

[0032] In step S1, the oxides and impurities on the surface of the amorphous master alloy ingot are polished and removed, and the amorphous master alloy particles are screened out using a screen after processing and crushing. The amorphous master alloy ingot is polished to remove the surface oxide layer to reduce the impurity content; the amorphous master alloy particles with suitable particle size are screened out using a screen to ensure the stability of the heating and feeding process. After granulation, 12 mesh and 30 mesh screens can be used for screening, so that the size of the amorphous master alloy particles after granulation is 2-3 mm, ensuring the stability of the heating and feeding process.

[0033] Step S2: In a vacuum environment, heating the amorphous master alloy particles to a molten state.

[0034] In step S2, the heating time is 1-3 hours to ensure that the amorphous master alloy particles reach a molten state.

[0035] In step S2, amorphous master alloy particles are fed into a vacuum feeding chamber of an amorphous crystal phase product production device; the amorphous crystal phase product production device comprises a feeding pipe, a nozzle, a mold, and a screw arranged in the feeding pipe, one end of the feeding pipe is provided with a feeding port, and the other end is provided with a discharging port, the discharging port is connected to the nozzle, and the nozzle is connected to the mold; the feeding pipe and the screw form a vacuum feeding chamber;

[0036] In step S2, the vacuum feeding chamber is evacuated and argon is introduced before heating, and the pressure of the vacuum feeding chamber is controlled to be (-0.05)Mpa-(-0.01)Mpa. The specific operation is as follows: the amorphous master alloy particles enter the feeding pipe through the feed port, and before heating the amorphous master alloy particles, the vacuum feeding chamber formed between the feeding pipe and the screw is evacuated until the vacuum feeding chamber pressure reaches 5-10Pa, and then high-purity argon is introduced to make the vacuum feeding chamber pressure (-0.05)Mpa-(-0.01)Mpa. The vacuum feeding chamber is evacuated and high-purity argon is introduced to form a protective atmosphere, and the argon gas is used to expel the internal gas of the amorphous master alloy particles to minimize the influence of impurity atmospheres such as oxygen during the heating and remelting process.

[0037] The feed pipe is provided with a feed preliminary heating section and a feed secondary heating section in sequence from the feed port to the discharge port, and the nozzle is provided with a nozzle secondary heating section and a nozzle injection heating section in sequence from the discharge port to the nozzle. The feed preliminary heating section forms a preliminary heating zone, and the heating temperature is a temperature at which the solid content of the magnesium-based amorphous alloy is 20%-40%; the feed secondary heating section and the nozzle secondary heating section form a secondary heating zone, and the heating temperature of the secondary heating zone is 5℃-10℃ higher than the injection temperature; the nozzle injection heating section forms an injection heating zone, and the heating temperature of the injection heating zone is the injection temperature of the magnesium-based amorphous alloy.

[0038] In step S2, in a vacuum environment protected by argon, the amorphous master alloy particles are fed by screws through the preliminary heating zone, the secondary heating zone and the injection heating zone in sequence, wherein the heating temperature of the preliminary heating zone is the temperature at which the solid content of the magnesium-based amorphous alloy is 20%-40%, the heating temperature of the secondary heating zone is 5°C-10°C higher than the injection temperature, and the heating temperature of the injection heating zone is the injection temperature of the magnesium-based amorphous alloy. The shear disturbance of the screw is used to reduce the component segregation problem as much as possible, thereby improving the stability of the magnesium-based amorphous alloy. At the same time, the use of screws to push and feed can continuously squeeze the amorphous master alloy particles, making them more compact and squeezing out the residual air inside, so that the structure of the prepared magnesium-based amorphous alloy is dense.

[0039] Since the alloy has a high viscosity after melting, in order to ensure smooth transportation of amorphous master alloy particles during heating, magnesium-based amorphous alloys are heated step by step. The amorphous master alloy particles first pass through the preliminary heating zone, where they form a solid-liquid mixed phase with a solid content of 20%-40%, and then enter the secondary heating zone for heating to fully melt the amorphous master alloy particles, and then enter the injection heating zone to lower the temperature for injection. The temperature of the step-by-step heating needs to be controlled within an appropriate range. If the heating temperature of the preliminary heating zone is too high or too low, the melting degree of the master alloy particles will be too high or too low, which will lead to transportation difficulties; if the temperature of the secondary heating zone and the injection heating zone is too high, the high cooling rate requirements for obtaining amorphous structure cannot be achieved, resulting in crystallization of the product; if the temperature of the secondary heating zone and the injection heating zone is too low, it is easy to cause difficulty in melt filling.

[0040] Step S3: In a vacuum environment, the molten amorphous master alloy particles are injected into a mold at a set injection temperature to be cooled and solidified to obtain a magnesium-based amorphous alloy product.

[0041] In step S3, the injection temperature is 450℃-520℃, and the injection speed is 1.5-3m / s. The injection temperature is controlled so that the magnesium-based amorphous alloy cools before crystallization to obtain an amorphous form. The injection speed is controlled within an appropriate range. If the injection speed is too high, it is easy to cause flash and mold leakage, causing crystallization; if the injection speed is too low, the high cooling rate provided by the mold will cause the front end of the molten metal to solidify prematurely, and the mold cannot be fully filled, causing problems such as material shortage.

[0042] In step S3, the temperature of the mold is 25°C-80°C. The mold temperature and the injection temperature cooperate with each other in an appropriate range to meet the high cooling rate requirements of the amorphous structure; if the mold temperature is too high, the high cooling rate requirements of the amorphous structure cannot be met, resulting in crystallization of the sample; if the mold temperature is too low, the cooling rate is too fast, which easily causes difficulty in filling the metal melt in the mold.

[0043] In step S3, the mold is sprayed with coating before injection, which is conducive to smooth demoulding of the product.

[0044] In the application method of magnesium-based amorphous alloy provided in the present embodiment, the vacuum feeding chamber is evacuated and high-purity argon is used as the protective gas before heating the amorphous master alloy particles, so that continuous operation can be realized, which solves the problem of repeated vacuuming and galiodization in the traditional process and improves production efficiency; in the process of injecting the amorphous master alloy particles into the mold after heating them to a molten state, segmented heating is adopted, and the heating temperature and the mold temperature are coordinated with each other to realize the stability and continuity of the melting, cooling and solidification process of the magnesium-based amorphous alloy, and the defects such as air entrainment and shrinkage cavity generated by the magnesium-based amorphous alloy in the filling and solidification process in the mold are reduced by screw shearing, and the organization density and mechanical properties of the magnesium-based amorphous alloy are improved, and the problems of low forming efficiency, inability to form complex structures and unstable and complex processes existing in the existing process are solved, so as to realize high-quality and continuous preparation of magnesium-based amorphous alloy. The application method of magnesium-based amorphous alloy provided in the present embodiment can meet the requirements of high cooling rate, one-time forming and stable process within the preferred process range, and realize efficient and continuous preparation of magnesium-based amorphous alloy.

[0045] The chemical formula of the magnesium-based amorphous alloy in this embodiment is Mg a Cu b Y c , where a+b+c=100, 60≤a≤70, 20≤b≤30, and the rest is c. Different atomic ratios will affect the material's physical properties (such as melting point, viscosity, liquidus temperature, etc.) and amorphous forming ability. For example, Mg 65 Cu 25 Y 10 The amorphous thickness can be about 2mm, Mg 70 Cu 20 Y 10 The amorphous thickness can be about 3mm, Mg 63 Cu 27 Y 10 The amorphous thickness can be about 5mm, Mg 61 Cu 29 Y 10 The amorphous thickness can be about 6mm, Mg 65 Cu 25 Y 10 The amorphous thickness can be about 7mm, Mg 60 Cu 29 Y 11 The amorphous thickness can be formed to be about 8mm.

[0046] Example 2

[0047] This embodiment provides a magnesium-based amorphous alloy Mg 65 Cu 25 Y 10 The application method comprises the following steps:

[0048] Step S1: processing an amorphous master alloy ingot into amorphous master alloy particles.

[0049] In step S1, a magnesium block, a copper block and a pure magnesium-yttrium alloy are prepared according to the magnesium-based amorphous alloy Mg 65 Cu 25 Y 10 The ingredients are mixed, melted and cooled to obtain an amorphous master alloy ingot, specifically:

[0050] According to the magnesium-based amorphous alloy Mg 65 Cu 25 Y 10 The ingredients are prepared according to the atomic number ratio of the expression, and the magnesium block, copper block and pure magnesium-yttrium alloy with a purity of 99% are polished to remove surface oxides and impurities. The blocks are cut into small pieces by an extruder and a cutter, placed in a graphite crucible for mixing, and then placed in a vacuum pit furnace for smelting. After cooling, a certain amount of amorphous master alloy ingots are obtained.

[0051] In step S1, the oxides and impurities on the surface of the amorphous master alloy ingot are polished and removed, and the ingot is crushed into small particles by a crusher, and then screened using 12-mesh and 30-mesh sieves, and the screening is repeated twice to obtain amorphous master alloy particles.

[0052] Step S2: In a vacuum environment, heating the amorphous master alloy particles to a molten state.

[0053] In step S2, the amorphous master alloy particles are added to the feeding tube, and then the vacuum device is started to evacuate the vacuum feeding chamber formed between the feeding tube and the screw. When the vacuum feeding chamber reaches 10Pa, high-purity argon is filled until the vacuum feeding chamber pressure is -0.05MPa, and the screw is started to transport the amorphous master alloy particles and heat and melt them. The temperature of the initial heating zone is 395℃, the temperature of the secondary heating zone is 520℃, and the heating temperature of the injection heating zone is 510℃, which is the same as that of the magnesium-based amorphous alloy Mg 65 Cu 25 Y 10 The injection temperature is the same as that of the injection molding machine, and the heating time is 1.5 hours until the amorphous master alloy particles are completely melted. At the same time, the water-cooled mold temperature controller is turned on to set the mold temperature to 50°C, and a release agent is sprayed on the mold.

[0054] Step S3: In a vacuum environment, the molten amorphous master alloy particles are injected into a mold at a set injection temperature to be cooled and solidified to obtain a magnesium-based amorphous alloy.

[0055] In step S3, the injection temperature is 510°C, the injection speed is 1.5 m / s, the injection is started and the injection is completed, and the ejector in the mold ejects the product to obtain an amorphous alloy sample with a thickness of 1.8 mm.

[0056] Figure 2 For the X-ray diffraction pattern of amorphous alloy samples, please refer to Figure 2 The amorphous alloy sample only contains the diffuse scattering peak of the amorphous phase, and no obvious diffraction peak of the crystallized phase appears, indicating that no crystallization occurs in the amorphous alloy sample.

[0057] Figure 3 This is the DSC curve of the amorphous alloy sample, please refer to Figure 3 , the amorphous alloy sample showed a crystallization peak of the amorphous phase, and no other peaks appeared. Figure 2-3 It can be seen that the amorphous alloy sample is a completely amorphous sample.

[0058] Example 3

[0059] This embodiment provides a magnesium-based amorphous alloy Mg 65 Cu 25 Y 10 The application method of the invention has the same main steps as those of Example 2, and the main difference from Example 2 is that:

[0060] In step S2, the feed pipe is provided with a feed preliminary heating section and a feed secondary heating section in sequence from the feed port to the discharge port, and the nozzle is provided with a nozzle secondary heating section and a nozzle injection heating section in sequence from the discharge port to the nozzle. The feed preliminary heating section forms a preliminary heating zone, and the heating temperature is a temperature at which the solid content of the magnesium-based amorphous alloy is 20%-40%; the feed secondary heating section and the nozzle secondary heating section form a secondary heating zone, and the heating temperature of the secondary heating zone is 5°C-10°C higher than the injection temperature; the nozzle injection heating section forms an injection heating zone, and the heating temperature of the injection heating zone is the injection temperature of the magnesium-based amorphous alloy.

[0061] Specifically, the feeding preliminary heating section consists of a first preliminary heating section and a second preliminary heating section. The heating temperature of the first preliminary heating section is 395°C, and the heating temperature of the second preliminary heating section is 475°C; the heating temperature of the feeding secondary heating section is 525°C, the heating temperature of the nozzle secondary heating section is 520°C, and the heating temperature of the nozzle injection heating section is 515°C. The heating time is 1.2 hours until the amorphous master alloy particles are completely melted.

[0062] The magnesium-based amorphous alloy Mg prepared in this embodiment 65 Cu 25 Y 10 XRD and DSC analysis showed that the material was in a pure amorphous state without precipitation of other crystalline phases.

[0063] Example 4

[0064] This embodiment provides a magnesium-based amorphous alloy Mg 65 Cu25 Y 10 The application method of the invention has the same main steps as those of Example 2, and the main difference from Example 2 is that:

[0065] In step S3, the heating temperature of the injection heating zone is 450°C.

[0066] Example 5

[0067] This embodiment provides a magnesium-based amorphous alloy Mg 65 Cu 25 Y 10 The application method of the invention has the same main steps as those of Example 2, and the main difference from Example 2 is that:

[0068] In step S3, the heating temperature of the injection heating zone is 520°C.

[0069] Comparative Example 1

[0070] This comparative example 1 provides an application method of a magnesium-based alloy material, and its main steps are the same as those of Example 2, and the main difference from Example 2 is that:

[0071] In step S2, no vacuuming and argon filling operations are performed before heating the amorphous master alloy particles.

[0072] Figure 4 This is the X-ray diffraction diagram of the magnesium-based alloy material of Comparative Example 1. Figure 4 The X-ray diffraction pattern of the magnesium-based alloy material shows a diffraction peak of the crystallized phase, which indicates that the mixing of oxygen in the atmosphere causes the crystallized phase to precipitate, making it impossible to prepare a completely amorphous sample.

[0073] Figure 5 This is the SEM image of the magnesium-based alloy material of Comparative Example 1. Figure 5 There are more bright white oxidation phase Y in the sample 2 O 3 Precipitation, there is also a dark gray crystallized phase Mg 2 Cu precipitated, and the oxygen content was as high as 3.73%. As no vacuum and argon protection operations were performed, the raw materials reacted chemically with oxygen to form impurities, which reduced the purity.

[0074] Comparative Example 2

[0075] This comparative example 2 provides an application method of a magnesium-based alloy material, and its main steps are the same as those of Example 2, and the main difference from Example 2 is:

[0076] In step S2, the feed pipe is provided with a feed preliminary heating section and a feed secondary heating section in sequence from the feed port to the discharge port, and the nozzle is provided with a nozzle secondary heating section and a nozzle injection heating section in sequence from the discharge port to the nozzle.

[0077] Specifically, the heating temperature of the first preliminary heating section is 395°C, the heating temperature of the second preliminary heating section is 480°C, the heating temperature of the feeding secondary heating section is 525°C, the heating temperature of the nozzle secondary heating section is 520°C, the heating temperature of the nozzle injection heating section is 520°C, and the heating time is 1 hour until the amorphous master alloy particles are completely melted. At the same time, the mold temperature is 30°C.

[0078] Figure 6 This is the X-ray diffraction diagram of the magnesium-based alloy material of Comparative Example 2. Figure 6 The X-ray diffraction pattern of the magnesium-based alloy material of Comparative Example 2 shows a diffraction peak of the crystallized phase, indicating that the crystallized phase has appeared. Since the injection temperature is too high, although the mold temperature is lowered, the high cooling rate requirement in the mold cannot be met, resulting in the sample cooling rate being too slow and the crystallized phase appearing.

[0079] Comparative Example 3

[0080] This comparative example 3 provides an application method of a magnesium-based alloy material, and its main steps are the same as those of Example 2, and the main difference from Example 2 is:

[0081] In step S2, the feed pipe is provided with a feed preliminary heating section and a feed secondary heating section in sequence from the feed port to the discharge port, and the nozzle is provided with a nozzle secondary heating section and a nozzle injection heating section in sequence from the discharge port to the nozzle. The heating temperature of the first preliminary heating section is 390°C, and the heating temperature of the second preliminary heating section is 450°C; the heating temperature of the feed secondary heating section is 520°C, the heating temperature of the nozzle secondary heating section is 520°C, and the heating temperature of the nozzle injection heating section is 510°C. At the same time, the mold temperature is 30°C.

[0082] During the injection process, it was found that because the heating temperature of the first preliminary heating section was set lower than the temperature range of 20% to 40% of the solid phase ratio, the screw got stuck during the feeding process. The low temperature could cause the screw to get stuck or jammed, resulting in poor delivery and unstable injection.

[0083] Comparative Example 4

[0084] This comparative example 4 provides an application method of a magnesium-based alloy material, and its main steps are the same as those of Example 2, and the main difference from Example 2 is:

[0085] In step S2, the feed pipe is provided with a feed preliminary heating section and a feed secondary heating section in sequence from the feed port to the discharge port, and the nozzle is provided with a nozzle secondary heating section and a nozzle injection heating section in sequence from the discharge port to the nozzle. The heating temperature of the first preliminary heating section is 395°C, and the heating temperature of the second preliminary heating section is 500°C; the heating temperature of the feed secondary heating section is 520°C, the heating temperature of the nozzle secondary heating section is 520°C, and the heating temperature of the nozzle injection heating section is 510°C.

[0086] During the injection process, it was found that the heating temperature of the first preliminary heating section was too high, exceeding the temperature range of 20% to 40% of the solid phase ratio, causing the screw to be covered by the material, the material to spin in place, the transportation to be not smooth, and the sample prepared after injection to be incomplete.

[0087] Comparative Example 5

[0088] This comparative example 5 provides an application method of a magnesium-based alloy material, and its main steps are the same as those of Example 2, and the main difference from Example 2 is:

[0089] In step S3, the injection speed is 3.3 m / s, the injection program is started to complete the injection, and the ejector in the mold ejects the magnesium-based alloy material.

[0090] Figure 7 For the X-ray diffraction diagram of the magnesium-based alloy material of Comparative Example 5, please refer to Figure 7 , the X-ray diffraction pattern has diffraction peaks of the crystallized phase. After the injection is completed, the excessively high injection speed causes excessive pressure after the molten metal rushes into the mold, causing air leakage in the mold and producing a large amount of flash. The flash is purely amorphous, but the crystallized phase is precipitated in the sample.

[0091] The present invention is not limited to the above-mentioned embodiments. If various changes or modifications to the present invention do not depart from the spirit and scope of the present invention, and if these changes and modifications fall within the scope of the claims and equivalent technologies of the present invention, the present invention is also intended to include these changes and modifications.

Claims

1. A magnesium-based amorphous alloy application method, characterized in that: The following steps are involved: Processing the amorphous master alloy ingot to form amorphous master alloy particles; In a vacuum environment, amorphous master alloy particles are heated to a molten state; In a vacuum environment, molten amorphous master alloy particles are injected into a mold at a set injection temperature, cooled and solidified to obtain a magnesium-based amorphous alloy product.

2. The magnesium-based amorphous alloy application method according to claim 1, characterized in that: In the step of heating the amorphous master alloy particles to a molten state in a vacuum environment, the heating time is 1-3 hours.

3. The magnesium-based amorphous alloy application method according to claim 2, characterized in that: In the step of heating the amorphous master alloy particles to a molten state in a vacuum environment, the amorphous master alloy particles sequentially pass through a preliminary heating zone, a secondary heating zone and an injection heating zone in a vacuum environment, wherein the heating temperature of the preliminary heating zone is a temperature at which the solid content of the magnesium-based amorphous alloy is 20%-40%, the heating temperature of the secondary heating zone is 5°C-10°C higher than the injection temperature, and the heating temperature of the injection heating zone is the injection temperature of the magnesium-based amorphous alloy.

4. The magnesium-based amorphous alloy application method according to claim 3, characterized in that: In a vacuum environment, in the step of heating amorphous master alloy particles to a molten state, the amorphous master alloy particles are fed into a vacuum feeding chamber of an amorphous crystal phase product production equipment; the amorphous crystal phase product production equipment comprises a feeding pipe, a nozzle, a mold and a screw arranged in the feeding pipe, one end of the feeding pipe is provided with a feeding port, and the other end is provided with a discharging port, the discharging port is connected to the nozzle, the nozzle is connected to the mold, and the feeding pipe and the screw form the vacuum feeding chamber; the feeding pipe is provided with a feeding preliminary heating section and a feeding secondary heating section in sequence along the direction from the feeding port to the discharging port, and the nozzle is provided with a nozzle secondary heating section and a nozzle injection heating section in sequence along the direction from the discharging port to the nozzle; The feeding primary heating section forms the primary heating zone, the feeding secondary heating section and the nozzle secondary heating section form the secondary heating zone, and the nozzle injection heating section forms the injection heating zone; In a vacuum environment, amorphous master alloy particles are pushed and fed by a screw through a preliminary heating zone, a secondary heating zone and an injection heating zone in sequence.

5. The magnesium-based amorphous alloy application method according to claim 4, characterized in that: In the step of heating the amorphous master alloy particles to a molten state in a vacuum environment, the vacuum feeding chamber is evacuated and argon gas is introduced, and the amorphous master alloy particles are fed by a screw in the argon atmosphere so as to pass through the preliminary heating zone, the secondary heating zone and the injection heating zone in sequence. The pressure of the vacuum feeding chamber is (-0.05) MPa-(-0.01) MPa.

6. The magnesium-based amorphous alloy application method according to any one of claims 1 to 5, characterized in that: In a vacuum environment, molten amorphous master alloy particles are injected into a mold at a set injection temperature to be cooled and solidified to form a magnesium-based amorphous alloy, and the injection temperature is 450°C-520°C.

7. The application method of the magnesium-based amorphous alloy according to claim 6, characterized in that: In a vacuum environment, molten amorphous master alloy particles are injected into a mold at a set injection temperature to be cooled and solidified to form a magnesium-based amorphous alloy, and the injection speed is 1.5-3m / s.

8. The magnesium-based amorphous alloy application method according to claim 7, characterized in that: In a vacuum environment, molten amorphous master alloy particles are injected into a mold at a set injection temperature to be cooled and solidified to obtain a magnesium-based amorphous alloy. The temperature of the mold is 25°C-80°C.

9. The magnesium-based amorphous alloy application method according to claim 1, characterized in that: In the step of processing the amorphous master alloy ingot into amorphous master alloy particles, The amorphous master alloy ingot is prepared by mixing magnesium block, copper block and pure magnesium-yttrium alloy according to the atomic ratio of magnesium-based amorphous alloy, grinding the magnesium block, copper block and pure magnesium-yttrium alloy to remove surface oxides and impurities, cutting them into small pieces, mixing them, smelting them and cooling them. The chemical expression of magnesium-based amorphous alloy is Mg a Cu b Y c , where a+b+c=100, 60≤a≤70, 20≤b≤30, and the rest is c.

10. The magnesium-based amorphous alloy application method according to claim 1, characterized in that: In the step of processing the amorphous master alloy ingot into amorphous master alloy particles, The amorphous master alloy particles are polished to remove oxides and impurities on the surface of the amorphous master alloy ingot, and are screened out using a sieve after processing and crushing.

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