Flame-retardant magnesium alloy with efficient forming diversification and preparation method thereof

Abstract

The invention provides a flame-retardant magnesium alloy with efficient forming diversification and a preparation method of the flame-retardant magnesium alloy. The flame-retardant magnesium alloy comprises the following components in percentage by mass: 4.0-10.0% of Al, 0.2-1.6% of Ca, 0.01-0.5% of Mn, 0.1-1.5% of RE, less than or equal to 0.05% of inevitable impurities and the balance of Mg, and the added RE is one or any combination of Ce, Sm, La and Sr. The preparation method comprises the following steps: smelting and casting, granulating and pulping, and performing pressure injection molding. According to the preparation method, diversified efficient forming of complex curved surfaces, thin-wall parts, special-shaped components and the like can be achieved through cooperative regulation and control of components, the process and the structure, and the obtained flame-retardant magnesium alloy is compact in structure, has the multi-level structural characteristics including a spherical primary solid phase, a fine solidification secondary phase and a grain boundary net-shaped eutectic phase and meanwhile has good flame retardance and mechanical performance; the ignition point is 750-1200 DEG C, the yield strength is 130-200 MPa, the tensile strength is 230-300 MPa, the ductility is 5-20%, and the aluminum alloy is suitable for industrial production.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of metal forming, in particular to a flame-retardant magnesium alloy with efficient forming diversification and a preparation method thereof. BACKGROUND

[0002] As the lightest metal structural material, magnesium alloy has the advantages of high specific strength / specific stiffness, high damping and shock absorption, good electromagnetic shielding, and abundant resources, and is an ideal choice for lightweight in advanced manufacturing fields such as aerospace, rail transportation, new energy vehicles, 3C, etc. However, magnesium alloy has a lively chemical property and is prone to oxidation and combustion with oxygen under high-temperature conditions such as smelting. It is difficult to extinguish and rescue, which not only causes damage to production equipment, but also threatens the safety of operators and causes significant loss of life and property. In addition, the demand for forming diversification is driving metal material processing technology towards higher precision, more complex structure, and more efficient production. Due to its unique hexagonal close-packed (HCP) crystal structure, magnesium alloy has poor deformation ability and cannot meet the demand of simple bending, stamping and other basic forming processes, and cannot achieve efficient forming of diversified structures, whether it is an aviation part with a complex surface, an electronic shell with a precise thin wall, or a rail transportation structural part with a large size and a car chassis part with various shapes.

[0003] Most of the reported flame-retardant magnesium alloys have high alloy element addition cost, and use complex processes such as "casting + solid solution + extrusion", which can only produce regular cross-section profiles (such as rods, plates, and simple profiles), have high production costs, are prone to cracking, and are not conducive to industrial production.

[0004] Therefore, how to simplify the process, reduce the cost, develop a flame-retardant magnesium alloy with efficient forming diversification, achieve complex structural parts in advanced manufacturing fields, lightweight, avoid cracking, have good flame-retardant safety, and realize industrial production, is a key technical problem to be solved in the magnesium alloy manufacturing industry. SUMMARY

[0005] In view of the above technical problems, the present application provides a flame-retardant magnesium alloy with efficient forming diversification, the alloy composition is Al: 4.0-10.0%, Ca: 0.2-1.6%, Mn: 0.01-0.5%, RE: 0.1-1.5%, unavoidable impurities ≤0.05%, and the rest is Mg, the RE component in the magnesium alloy is one or any combination of Ce, Sm, La, and Sr; the preparation method of the flame-retardant magnesium alloy with efficient forming diversification comprises the following steps:

[0006] (1) Under the protection of SF6 and CO2 mixed gas, the raw materials of pure magnesium, pure aluminum, magnesium-manganese intermediate alloy, rare earth intermediate alloy, magnesium-calcium intermediate alloy are added into the smelting furnace in turn, the smelting temperature is 660-750℃, after heating and melting, stirring for 2-15min, after refining and degassing, cooling to 640-670℃ for 5-40min, then heating to 660-750℃, skimming off the dross, then casting to obtain magnesium alloy ingot, then cutting at a speed of 5-50mm / s to prepare magnesium alloy particles, the shape of the magnesium alloy particles is strip, rod or spherical, the equivalent diameter of the magnesium alloy particles is 0.5-5mm, the rare earth intermediate alloy is one or any combination of magnesium-cerium, magnesium-samarium, magnesium-lanthanum, aluminum-strontium intermediate alloy, the SF6 and CO2 mixed gas: SF6 volume is 0.1-5%;

[0007] (2) The magnesium alloy particles obtained in step (1) are added into an injection molding machine, and are melted into a semi-solid slurry at 450-650℃;

[0008] (3) The semi-solid slurry obtained in step (2) is subjected to pressure injection molding treatment to obtain a high-efficiency shaped diversified flame-retardant magnesium alloy, the pressure injection molding treatment: mold temperature: 200-300℃, injection speed: 1-3m / s, injection pressure: 100-200Bar; the flame-retardant magnesium alloy has high-efficiency shaping and diversification: the ignition point is 750-1200℃, the yield strength is 130-200MPa, the tensile strength is 230-300MPa, and the elongation is 5-20%; the high-efficiency shaping and diversification can be simple structure or complex structure near net shape: one-step shaping of complex curved surface, thin-walled parts, special-shaped components and other diversified structures, the shaping cycle is 3-10s, the particle utilization rate is ≥85%, the internal porosity of the structure part is ≤1.5%, the surface roughness Ra is ≤1.6μm, the size deviation is ≤5%, the good product rate is ≥95%, and it is suitable for industrial production; the microstructure of the flame-retardant magnesium alloy is a multi-level structure: including spherical primary α-Mg solid phase with an average grain size of 20-50μm, fine solidification secondary phase with an average grain size of 1-10μm, and network eutectic phase distributed along the grain boundary.

[0009] Preferably, the alloy composition is Al: 5.0-9.0%, Ca: 0.3-1.5%, Mn: 0.05-0.3%, RE: 0.2-1.0% by mass, wherein Ca+RE≤1.7wt.%, Al / (Ca+RE)≥4.5.

[0010] Further, the smelting temperature of step (1) is 680-730℃, after heating and melting, stirring for 5-10min, after refining and degassing, cooling to 650-660℃ and standing for 10-30min, then heating to 680-730℃; skimming the dross, then pouring into a mold to obtain a magnesium alloy ingot, then processing the magnesium alloy ingot into magnesium alloy particles at a cutting speed of 7-30mm / s, and the equivalent diameter of the magnesium alloy particles is 0.7-3mm.

[0011] Further, the magnesium alloy particles obtained in step (2) are added into an injection molding machine, and are melted into a semi-solid slurry at 500-630℃.

[0012] Further, the semi-solid slurry obtained in step (3) is subjected to pressure injection molding treatment to obtain a flame-retardant magnesium alloy with high-efficiency forming diversification, wherein the pressure injection molding treatment has a mold temperature of 210-280℃, an injection speed of 1.5-2.5m / s, and an injection pressure of 140-180Bar, and the flame-retardant magnesium alloy with high-efficiency forming diversification has a flame point of 770-900℃, a yield strength of 135-170MPa, a tensile strength of 240-280MPa, and an elongation of 6-18%.

[0013] Compared with the prior art, the present application has the following advantages through the synergistic regulation of components, processes and structures:

[0014] The prior art generally relies on a complex process such as 'heat treatment + pressure processing' to realize simple forming of the flame-retardant magnesium alloy, and the as-cast structure of the flame-retardant alloy is mostly coarse dendrites, and the mechanical properties are poor, and due to the microstructure characteristics of the magnesium alloy, only simple structure profiles such as rods and plates can be formed; compared with the prior art, the present application realizes composition and structure optimization and simplifies the process through the synergistic regulation of component interaction, ratio, process and process parameters, strictly controls parameters such as Ca+RE content and Al / (Ca+RE) ratio, realizes 'one-step near-net forming' by using semi-solid'shear thinning', can process not only simple structures but also complex curved surfaces, thin-walled parts, special-shaped components and other diversified and efficient forming, avoids the cracking phenomenon in the process of processing the alloy in the prior art, the forming cycle is as short as 3-10s, the particle utilization rate is greater than or equal to 85%, the internal porosity of the structural part is less than or equal to 1.5%, the surface roughness Ra is less than or equal to 1.6μm, the size deviation is less than or equal to 5%, and the good product rate is greater than or equal to 95%, and the liquid-solid interval of the alloy is adjusted, the grain growth is effectively inhibited, the prepared magnesium alloy has a multi-level characteristic structure composed of spherical primary α-Mg solid phase with an average grain size of 20-50μm, fine solidification secondary phase with an average grain size of 1-10μm and network eutectic phase distributed along the grain boundary, the structure is dense, the solid solubility is high, a dense composite flame-retardant protective film can be formed on the matrix surface, the flame-retardant property of the magnesium alloy is effectively improved under the condition of ensuring high strength and plasticity, and the magnesium alloy is suitable for industrial production. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application.

[0016] Figure 1 The microstructure morphology diagram of the Mg-8.6Al-1.4Ca-0.15Mn-0.18Sm-0.1Ce alloy prepared for the embodiment 1 of the present application;

[0017] Figure 2 The room temperature tensile engineering stress-strain curve of the Mg-8.6Al-1.4Ca-0.15Mn-0.18Sm-0.1Ce alloy prepared for the embodiment 1 of the present application. DETAILED DESCRIPTION

[0018] Embodiment 1

[0019] Taking the Mg-8.6Al-1.4Ca-0.15Mn-0.18Sm-0.1Ce flame-retardant magnesium alloy with high-efficiency forming diversification as an example, the preparation method is as follows:

[0020] (1) Under the protection of SF6 and CO2 mixed gas (SF6 volume accounts for 0.5%), the raw materials of pure magnesium, pure aluminum, magnesium-manganese intermediate alloy, magnesium-cerium intermediate alloy, magnesium-samarium intermediate alloy and magnesium-calcium intermediate alloy with proper quality are sequentially added into a smelting furnace, the smelting temperature is 700℃, after heating and melting, the stirring is carried out for 10 min, after refining and degassing, the temperature is lowered to 650℃ and the magnesium alloy ingot is obtained after standing for 20 min, then the temperature is raised to 700℃, the dross is removed, and the magnesium alloy ingot is obtained after casting, and the magnesium alloy particles are prepared by cutting at a speed of 12 mm / s, the magnesium alloy particles are in the form of strips, and the equivalent diameter is 1.2 mm;

[0021] (2) The magnesium alloy particles obtained in step (1) are added into an injection molding machine, and are melted into a semi-solid slurry at 530-630℃;

[0022] (3) The semi-solid slurry obtained in step (2) is subjected to pressure injection molding treatment, and the parameters are as follows: mold temperature: 280℃, injection speed: 2 m / s, injection pressure: 150 Bar, and the high-efficiency-shaped diversified Mg-8.6Al-1.4Ca-0.15Mn-0.18Sm-0.1Ce flame-retardant magnesium alloy is obtained.

[0023] The flame-retardant and mechanical properties of the obtained flame-retardant magnesium alloy are as follows: ignition point 875℃, yield strength ~ 156 MPa, tensile strength ~ 262 MPa, elongation 9%; the one-step forming of complex curved surface, thin-walled parts, special-shaped components and other diversified structures can be realized, the forming cycle is 5 s, the particle utilization rate is 85%, the internal porosity of the structural part is 1.4%, the surface roughness Ra is 1.5 μm, the size deviation is ± 5%, the good product rate is 95%, and it is suitable for industrial production; the microstructure of the flame-retardant magnesium alloy is a multi-level structure: including a spherical primary α-Mg solid phase with an average grain size of 34 μm, a fine solidification secondary phase with an average grain size of 5 μm, and a network eutectic phase distributed along the grain boundary (see Figure 1 ).

[0024] Example 2

[0025] Taking the Mg-7.6Al-0.7Ca-0.26Mn-0.2Sr flame-retardant magnesium alloy with high-efficiency-shaped diversification as an example, the preparation method is as follows:

[0026] (1) Under the protection of SF6 and CO2 mixed gas (SF6 volume accounts for 1%), raw materials of pure magnesium, pure aluminum, magnesium-manganese intermediate alloy, aluminum-strontium intermediate alloy and magnesium-calcium intermediate alloy with proper quality are added into a smelting furnace in sequence, the smelting temperature is 700℃, after heating and melting, stirring is carried out for 10 min, after refining and degassing, the temperature is lowered to 650℃ and kept for 20 min, then the temperature is raised to 700℃, after skimming off the dross, magnesium alloy ingot is obtained by casting, and magnesium alloy particles are prepared by processing at a cutting speed of 10 mm / s, the magnesium alloy particles are rod-shaped, and the equivalent diameter is 1 mm;

[0027] (2) The magnesium alloy particles obtained in step (1) are added into an injection molding machine, and are melted into semi-solid slurry at 520-625℃;

[0028] (3) The semi-solid slurry obtained in step (2) is subjected to pressure injection molding treatment, and the parameters are as follows: mold temperature: 250℃, injection speed: 2.4 m / s, injection pressure: 160 Bar, and Mg-7.6Al-0.7Ca-0.26Mn-0.2Sr flame-retardant magnesium alloy with high-efficiency forming diversification is obtained.

[0029] The flame-retardant magnesium alloy has the following flame-retardant and mechanical properties: ignition point 776℃, yield strength ~ 150 MPa, tensile strength ~ 243 MPa, elongation 9.5%, and can realize one-step forming of diversified structures such as complex curved surface, thin-walled parts, special-shaped components, forming cycle 7 s, particle utilization rate 85%, internal porosity of structural parts 1.2%, surface roughness Ra = 1.5 μm, size deviation ± 5%, good product rate 95%, and is suitable for industrial production; the microstructure of the flame-retardant magnesium alloy is a multi-level structure, which includes spherical primary α-Mg solid phase with an average grain size of 45 μm, fine solidification secondary phase with an average grain size of 7 μm, and network eutectic phase distributed along the grain boundary.

[0030] Example 3

[0031] Taking Mg-8.1Al-0.9Ca-0.17Mn-0.33Ce flame-retardant magnesium alloy with high-efficiency forming diversification as an example, the preparation method is as follows:

[0032] (1) Under the protection of SF6 and CO2 mixed gas (SF6 volume accounts for 1.5%), raw materials of pure magnesium, pure aluminum, magnesium-manganese intermediate alloy, magnesium-cerium intermediate alloy and magnesium-calcium intermediate alloy with proper quality are added into a smelting furnace in sequence, the smelting temperature is 690℃, after heating and melting, stirring is carried out for 10 min, after refining and degassing, the temperature is lowered to 660℃ and kept for 20 min, then the temperature is raised to 690℃, after skimming off the dross, magnesium alloy ingot is obtained by casting, and magnesium alloy particles are prepared by processing at a cutting speed of 8 mm / s, the magnesium alloy particles are spherical, and the equivalent diameter is 0.8 mm;

[0033] (2) The magnesium alloy particles obtained in step (1) are added to an injection molding machine, and melted into a semi-solid slurry at 550-625℃;

[0034] (3) The semi-solid slurry obtained in step (2) is subjected to pressure injection molding treatment, with the parameters being: mold temperature: 250℃, injection speed: 2.4m / s, injection pressure: 166Bar, to obtain the Mg-8.1Al-0.9Ca-0.17Mn-0.33Ce flame-retardant magnesium alloy with high-efficiency forming diversification.

[0035] The flame-retardant magnesium alloy has the following flame-retardant and mechanical properties: ignition point 823℃, yield strength ~ 166MPa, tensile strength ~ 257MPa, elongation 7%; can realize one-step forming of diversified structures such as complex curved surfaces, thin-walled parts, and special-shaped components, with a forming cycle of 9s, particle utilization rate of 90%, internal porosity of the structural part of 1.2%, surface roughness Ra=1.2μm, dimensional deviation ±3%, and good product rate of 90%, and is suitable for industrial production; the microstructure of the flame-retardant magnesium alloy is a multi-level structure including a spherical primary α-Mg solid phase with an average grain size of 30μm, a fine solidification secondary phase with an average grain size of 5μm, and a network eutectic phase distributed along the grain boundaries.

[0036] Example 4

[0037] Taking the Mg-6.2Al-0.78Ca-0.16Mn-0.16Sm-0.08Ce flame-retardant magnesium alloy with high-efficiency forming diversification as an example, the preparation method is as follows:

[0038] (1) Under the protection of SF6 and CO2 mixed gas (SF6 volume accounts for 4.5%), the raw materials pure magnesium, pure aluminum, magnesium-manganese intermediate alloy, magnesium-cerium intermediate alloy, magnesium-samarium intermediate alloy, and magnesium-calcium intermediate alloy with proper quality are sequentially added to a smelting furnace, the smelting temperature is 720℃, after heating and melting, stirring for 5min, after refining and degassing, the temperature is lowered to 660℃ and kept for 15min, then the temperature is raised to 720℃, after skimming off the dross, the magnesium alloy ingot is obtained by casting, and the magnesium alloy particles are prepared by cutting at a speed of 13mm / s, the magnesium alloy particles are rod-shaped, and the equivalent diameter is 1.3mm;

[0039] (2) The magnesium alloy particles obtained in step (1) are added to an injection molding machine, and melted into a semi-solid slurry at 555-625℃;

[0040] (3) the semi-solid slurry obtained in step (2) is subjected to pressure injection forming treatment, parameters are: mold temperature: 250℃, injection speed: 2.2m / s, injection pressure: 168Bar, to obtain the high-efficiency forming diversified Mg-6.2Al-0.78Ca-0.16Mn-0.16Sm-0.08Ce flame-retardant magnesium alloy.

[0041] The flame-retardant magnesium alloy has the following flame-retardant and mechanical properties: ignition point 813℃, yield strength ~145MPa, tensile strength ~263MPa, elongation 13%; can realize one-step forming of diversified structures such as complex curved surface, thin-walled parts, special-shaped components, forming cycle 6s, particle utilization rate 90%, internal porosity of structural parts 1%, surface roughness Ra=1μm, size deviation ±4%, good product rate 95%, suitable for industrial production; the microstructure of the flame-retardant magnesium alloy is a multi-level structure: including a spherical primary α-Mg solid phase with an average grain size of 38μm, a fine solidification secondary phase with an average grain size of 7μm, and a network eutectic phase distributed along the grain boundaries.

[0042] Example 5

[0043] Taking the Mg-5.4Al-0.3Ca-0.1Mn-0.66Ce-0.23La flame-retardant magnesium alloy with high-efficiency forming diversification as an example, its preparation method is as follows:

[0044] (1) under the protection of SF6 and CO2 mixed gas (SF6 volume accounts for 2.5%), the raw materials pure magnesium, pure aluminum, magnesium-manganese intermediate alloy, magnesium-cerium intermediate alloy, magnesium-lanthanum intermediate alloy, and magnesium-calcium intermediate alloy with proper quality are sequentially added into a smelting furnace, the smelting temperature is 730℃, after heating and melting, stirring for 5min, after refining and degassing, the temperature is lowered to 660℃ and kept for 25min, then the temperature is raised to 730℃, after removing the dross, the magnesium alloy ingot is cast, and the magnesium alloy particles are prepared by cutting at a speed of 25mm / s, the magnesium alloy particles are in strip shape, and the equivalent diameter is 2.5mm;

[0045] (2) the magnesium alloy particles obtained in step (1) are added into an injection molding machine, and are melted into a semi-solid slurry at 560-630℃;

[0046] (3) the semi-solid slurry obtained in step (2) is subjected to pressure injection forming treatment, parameters are: mold temperature: 230℃, injection speed: 2.2m / s, injection pressure: 170Bar, to obtain the high-efficiency forming diversified Mg-5.4Al-0.3Ca-0.1Mn-0.66Ce-0.23La flame-retardant magnesium alloy.

[0047] The fire-retardant magnesium alloy has the fire-retardant and mechanical properties of ignition point 853 DEG C, yield strength about 138 MPa, tensile strength about 279 MPa, elongation 17%, can realize one-step forming of diversified structures such as complex curved surface, thin-walled part, special-shaped component, forming cycle 4s, particle utilization rate 90%, internal porosity of structural part 0.8%, surface roughness Ra=0.9 microns, size deviation ±3%, good product rate 90%, and is suitable for industrial production; and the microstructure of the fire-retardant magnesium alloy is a multi-level structure, which includes a spherical primary solid phase of alpha-Mg with average grain size 29 microns, a fine solidification secondary phase with average grain size 8 microns, and a network eutectic phase distributed along the grain boundary.

[0048] In addition, the ratio and process parameters used in each embodiment of the present application are different, but the material properties obtained are different, thus illustrating that the excellent effect obtained by the present application is not determined by a certain component, ratio and process parameter, but is realized through the synergistic regulation of component interaction, ratio, process and process parameter, and only within the protection scope of the claims, the most excellent technical effect can be realized.

Claims

1. A flame retardant magnesium alloy having high efficient forming diversification, characterized by, The alloy composition is Al: 4.0-10.0%, Ca: 0.2-1.6%, Mn: 0.01-0.5%, RE: 0.1-1.5% by mass, unavoidable impurities ≤0.05%, and the rest is Mg, wherein the RE component in the magnesium alloy is one or any combination of Ce, Sm, La, and Sr; the preparation method of the flame-retardant magnesium alloy with high-efficiency forming diversification comprises the following steps: (1) Under the protection of SF6 and CO2 mixed gas, raw materials of pure magnesium, pure aluminum, magnesium-manganese intermediate alloy, rare earth intermediate alloy, and magnesium-calcium intermediate alloy are sequentially added into a smelting furnace at a smelting temperature of 660-750℃, and after heating and melting, stirring is performed for 2-15 min, and after refining and degassing, the temperature is lowered to 640-670℃ and the magnesium alloy ingot is obtained after standing for 5-40 min, and then the temperature is raised to 660-750℃, the dross is removed, and the magnesium alloy ingot is cast to obtain magnesium alloy particles, which are prepared by processing at a cutting speed of 5-50 mm / s, and the magnesium alloy particles are in the shape of strips, rods, or spheres; the equivalent diameter of the magnesium alloy particles is 0.5-5 mm; the rare earth intermediate alloy is one or any combination of magnesium-cerium, magnesium-samarium, magnesium-lanthanum, and aluminum-strontium intermediate alloy; the SF6 and CO2 mixed gas contains 0.1-5% SF6 by volume; (2) The magnesium alloy particles obtained in step (1) are added into an injection molding machine to melt into a semi-solid slurry at 450-650℃; (3) The semi-solid slurry obtained in step (2) is subjected to pressure injection molding treatment to obtain the flame-retardant magnesium alloy with high-efficiency forming diversification, wherein the pressure injection molding treatment has a mold temperature of 200-300℃, an injection speed of 1-3 m / s, and an injection pressure of 100-200 Bar; the flame-retardant magnesium alloy with high-efficiency forming diversification has a flame retardance of 750-1200℃, a yield strength of 130-200 MPa, a tensile strength of 230-300 MPa, and an elongation of 5-20%; the high-efficiency forming diversification can be simple structure or complex structure near-net forming: one-step forming of complex curved surface, thin-walled parts, and special-shaped components, forming cycle of 3-10 s, particle utilization rate ≥85%, internal porosity of structural parts ≤1.5%, surface roughness Ra ≤1.6 μm, dimensional deviation ≤5%, and good product rate ≥95%, which is suitable for industrial production; the microstructure of the flame-retardant magnesium alloy is a multi-level structure composed of spherical primary α-Mg solid phase with an average grain size of 20-50 μm, fine solidification secondary phase with an average grain size of 1-10 μm, and network eutectic phase distributed along the grain boundaries.

2. The flame retardant magnesium alloy with high efficient forming diversification according to claim 1, characterized in that, The alloy composition is Al: 5.0-9.0%, Ca: 0.3-1.5%, Mn: 0.05-0.3%, RE: 0.2-1.0% by mass, wherein Ca+RE ≤1.7 wt.%, and Al / (Ca+RE) ≥4.

5.

3. The flame retardant magnesium alloy with high efficient forming diversification according to claim 1, characterized in that, The melting temperature in step (1) is 680-730℃, after heated and melted, stirring for 5-10min, after refining and degassing, cooling to 650-660℃ and standing for 10-30min, then heating to 680-730℃; skimming the dross, then pouring into a mold to obtain magnesium alloy ingot, then processing the magnesium alloy ingot into particles at a cutting speed of 7-30mm / s, the equivalent diameter of the magnesium alloy particles is 0.7-3mm.

4. The flame retardant magnesium alloy with high efficient forming diversification according to claim 1, characterized in that, The magnesium alloy particles obtained in step (2) are added into an injection molding machine, and are melted into semi-solid slurry at 500-630℃.

5. The flame retardant magnesium alloy with high efficient forming diversification according to claim 1, characterized in that, The semi-solid slurry obtained in step (3) is subjected to pressure injection molding treatment to obtain a high-efficiency-shaped diversified flame-retardant magnesium alloy, the pressure injection molding treatment is as follows: mold temperature: 210-280℃, injection speed: 1.5-2.5m / s, injection pressure: 140-180Bar, the flame-retardant magnesium alloy has the following flame-retardant and mechanical properties: ignition point: 770-900℃, yield strength: 135-170MPa, tensile strength: 240-280MPa, elongation: 6-18%.

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