High-strength wrought magnesium alloy plate with low anisotropy at room temperature and preparation method

Abstract

The invention relates to a preparation method of a high-strength wrought magnesium alloy plate with low anisotropy at room temperature, which comprises a magnesium alloy cast ingot smelting step, a cast ingot solution treatment step, a hot extrusion cogging step, a multi-time one-way room temperature rolling step and an aging heat treatment step, and has the advantages of adoption of conventional equipment, low cost, simple process flow and the like. The method is very suitable for large-scale industrial application. Meanwhile, the invention further provides the high-strength wrought magnesium alloy plate which is low in anisotropy at the room temperature and obtained through the preparation method. The advantages of combined addition of Nd and Gd are fully exerted, high strength and low anisotropy of the plate at the room temperature are achieved through the process provided by the invention, and the comprehensive mechanical property of the magnesium rare earth alloy plate is remarkably superior to that of other magnesium rare earth alloy plates with similar rare earth addition amount and preparation cost.

Description

Technical Field

[0001] The invention relates to the field of magnesium alloy materials and material preparation. Background Art

[0002] Magnesium alloy is the lightest structural metal material with advantages such as high specific strength, high specific stiffness and good recycling potential. It is widely used in aerospace, transportation and electronic products. Compared with cast magnesium alloy, wrought magnesium alloy can obtain better room temperature mechanical properties through defect elimination, organization and texture regulation, and better meet the application requirements of engineering structural parts. However, traditional wrought magnesium alloy has obvious anisotropy of room temperature mechanical properties, which makes it difficult to ensure the service safety of components under complex loads such as alternating and variable loads.

[0003] Developing new wrought magnesium alloy sheets with low anisotropy and high strength at room temperature can give full play to the lightweight and high-strength characteristics of wrought magnesium alloy sheets, improve their service capability under complex loads, and thus promote the engineering application of wrought magnesium alloys.

[0004] The technicians in this field have developed some deformed magnesium alloy sheets with low anisotropy and high strength at room temperature, but the preparation process still has disadvantages such as high cost or complicated process flow. For example, the Chinese patent with authorization announcement number CN113953322B discloses a method for preparing Mg-Al-Zn-Y sheets with low anisotropy and high strength at room temperature, and the preparation process includes casting, solution treatment, hot extrusion, differential temperature rolling and subsequent heat treatment, wherein the differential temperature rolling process has multiple passes, multi-directional rolling, and intermediate heat treatment process, and the process is relatively complicated. Summary of the invention

[0005] The purpose of the present invention is to avoid the shortcomings of the prior art and provide a high-strength deformable magnesium alloy sheet with low anisotropy at room temperature and a preparation method thereof, which can solve the problem of obvious anisotropy of mechanical properties of traditional deformable magnesium alloys at room temperature and has a simpler process.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a method for preparing a high-strength deformable magnesium alloy sheet with low anisotropy at room temperature, comprising the following steps:

[0007] Step 1, smelting the magnesium alloy and casting it to obtain a magnesium alloy ingot;

[0008] Step 2: subjecting the magnesium alloy ingot to solution heat treatment at a solution temperature of 510 to 530° C. and a solution time of 10 to 16 hours, and obtaining an ingot after cooling;

[0009] Step 3, under the conditions of extrusion temperature of 420-480°C, extrusion ratio of 6:1-18:1, and extrusion speed of 0.5-1.5 m / min, the billet is extruded and opened, and a pre-extruded sheet is obtained after air cooling;

[0010] Step 4, rolling the pre-extruded sheet along the extrusion direction at room temperature, with 1 to 3 rolling passes and a single-pass pressing amount of 5 to 10%;

[0011] Step 5: Perform aging heat treatment on the pre-extruded plate after rolling at an aging temperature of 150-200° C. and an aging time of 16-48 hours, and obtain a high-strength deformable magnesium alloy plate after air cooling to room temperature.

[0012] Furthermore, the smelting in step one is carried out in a resistance furnace, and the Zn element of the magnesium alloy is added to the smelting in the form of pure metal, and the Nd, Gd, and Zr elements are added to the smelting in the form of intermediate alloys Mg-25Gd, Mg-30Nd, and Mg-33Zr, respectively; the Mg element is added to the smelting in the form of pure metal, or in the form of Mg-25Gd, Mg-30Nd, and Mg-33Zr.

[0013] Furthermore, the alloy ingot in step 1 is cast by gravity casting, and the casting temperature after smelting is 740-760°C.

[0014] Furthermore, the casting process is specifically casting at 740-760° C. into a permanent mold preheated at 150-225° C. to obtain an alloy ingot with a diameter of 85-95 mm and a height of 140-160 mm.

[0015] Furthermore, the solution heat treatment described in step 2 is carried out in an industrial pit furnace, and after water cooling, an ingot with a diameter of 79 to 81 mm and a length of 110 to 130 mm is obtained by turning.

[0016] Furthermore, in step three, the preheating temperature before extrusion during billet extrusion is the same as the extrusion temperature, and the preheating time is 0.25 to 1 hour. The length of the obtained pre-extruded plate is 0.6 to 1.8 m, the width is 54 to 58 mm, and the thickness is 5 to 15 mm.

[0017] Furthermore, step three also includes cutting the pre-extruded plate into plates with a length of 78 to 82 mm, a width of 54 to 58 mm, and a thickness of 5 to 15 mm for rolling by wire cutting.

[0018] Furthermore, there is no intermediate heat treatment between the rolling passes described in step 4, the roller diameter is 150-250 mm, and the rolling mill speed is 1000-1300 rpm.

[0019] The present invention also provides a high-strength deformable magnesium alloy plate with low anisotropy at room temperature obtained by the preparation method, wherein the alloy composition of the magnesium alloy plate comprises, by weight percentage: 2.0-3.0% Nd, 0.8-1.7% Gd, 0.05-0.4% Zn, 0.15-0.6% Zr, and the rest is Mg and impurities.

[0020] Furthermore, the alloy composition of the magnesium alloy plate is Mg-2.35Nd-1.32Gd-0.18Zn-0.32Zr by weight.

[0021] The beneficial effects of the present invention are:

[0022] (1) The present invention gives full play to the unique advantages and remarkable effects of the combined addition of Nd and Gd elements in the low anisotropy of mechanical properties and alloy strengthening of extruded alloy plates at room temperature, and achieves high strength and low anisotropy of the plates at room temperature through the process provided by the present invention. Its comprehensive mechanical properties are significantly better than those of other magnesium rare earth alloy plates with similar rare earth addition amounts and preparation costs.

[0023] (2) The extrusion blanking adopted in the present invention is a typical one-step forming process, and the rolling method adopted is unidirectional room temperature rolling, without intermediate heat treatment and with a small number of rolling times. The preparation method has the advantages of using conventional equipment, low cost and simple process flow, and is very suitable for large-scale industrial applications, and has a good prospect for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Preparation flow chart of the present invention;

[0025] Figure 2 Optical microscopic structure diagram of the solid solution alloy in specific example 1 of the present invention;

[0026] Figure 3 Scanning microstructure diagram of the extruded alloy sheet in the specific example 1 of the present invention;

[0027] Where (a) is the transverse-longitudinal plane, (b) is the transverse-normal plane;

[0028] Figure 4 The room temperature engineering stress-engineering strain curve of the extruded alloy plate in the specific example 1 of the present invention;

[0029] Figure 5 Transmission microstructure diagram of the extruded alloy plate after room temperature rolling and aging treatment in specific example 1 of the present invention. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] In order to achieve the above object, the present invention provides the following specific implementation methods:

[0032] Embodiment 1: A method for preparing a high-strength deformable magnesium alloy sheet with low anisotropy at room temperature, comprising the following steps:

[0033] Step 1: After smelting the magnesium alloy, casting is performed to obtain a magnesium alloy ingot:

[0034] The smelting is carried out in a resistance furnace, the Zn element of the magnesium alloy is added to the smelting in the form of pure metal, the Nd, Gd and Zr elements are added to the smelting in the form of intermediate alloys Mg-25Gd, Mg-30Nd and Mg-33Zr respectively, and the Mg element is added to the smelting in the form of pure metal or in the form of Mg-25Gd, Mg-30Nd and Mg-33Zr; the alloy composition of the finally obtained magnesium alloy ingot includes, by weight percentage, 2.0-3.0% Nd, 0.8-1.7% Gd, 0.05-0.4% Zn, 0.15-0.6% Zr, and the rest is Mg and impurities.

[0035] The alloy ingot is cast by gravity casting, and the casting temperature after smelting is 740-760°C. The casting process is specifically casting at 740-760°C into a permanent mold with a preheating temperature of 150-225°C to obtain an alloy ingot with a diameter of 85-95mm and a height of 140-160mm.

[0036] Step 2: In an industrial pit furnace, the magnesium alloy ingot is solution heat treated at a solution temperature of 510-530°C and a solution time of 10-16h, and an ingot is obtained after water cooling, and an ingot with a diameter of 79-81mm and a length of 110-130mm is obtained by turning.

[0037] Step 3, under the conditions of extrusion temperature of 420-480°C, extrusion ratio of 6:1-18:1, and extrusion speed of 0.5-1.5 m / min, the billet is extruded and opened, and the pre-extruded sheet is obtained after air cooling;

[0038] Among them, when the billet is extruded and opened, the preheating temperature before extrusion is the same as the extrusion temperature, and the preheating time is 0.25 to 1 hour. The length of the obtained pre-extruded plate is 0.6 to 1.8 m, the width is 54 to 58 mm, and the thickness is 5 to 15 mm. The pre-extruded plate is cut into plates with a length of 78 to 82 mm, a width of 54 to 58 mm, and a thickness of 5 to 15 mm for rolling by wire cutting.

[0039] Step 4, rolling the pre-extruded sheet along the extrusion direction at room temperature, with 1 to 3 rolling passes and a single-pass pressing amount of 5 to 10%;

[0040] There is no intermediate heat treatment between rolling passes, the roller diameter is 150-250mm, and the rolling mill speed is 1000-1300rpm.

[0041] Step 5: Perform aging heat treatment on the pre-extruded plate after rolling at an aging temperature of 150-200° C. and an aging time of 16-48 hours, and obtain a high-strength deformable magnesium alloy plate after air cooling to room temperature.

[0042] Embodiment 2: A high-strength deformable magnesium alloy sheet with low anisotropy at room temperature is obtained by the preparation method in Embodiment 1, and the alloy composition of the magnesium alloy sheet includes, by weight percentage: 2.0-3.0% Nd, 0.8-1.7% Gd, 0.05-0.4% Zn, 0.15-0.6% Zr, and the rest is Mg and impurities.

[0043] In order to verify that the method and the magnesium alloy sheet obtained by the method have low anisotropy and high strength at room temperature, the present invention also provides the following specific examples and comparative examples:

[0044] Specific example 1:

[0045] The present invention is described in detail by taking an alloy plate having an alloy composition of Mg-2.35Nd-1.32Gd-0.18Zn-0.32Zr wt.% as an example. The preparation process includes alloy smelting, solution treatment, extrusion blanking, room temperature rolling and aging heat treatment.

[0046] 1. The alloy is melted in a resistance furnace and cast into a permanent mold preheated at 200°C at 745°C to obtain an alloy ingot with a diameter of 90 mm and a height of 155 mm. The Zn element is added in the form of pure metal, and the Nd, Gd, and Zr elements are added in the form of intermediate alloys Mg-25Gd, Mg-30Nd, and Mg-33Zr, respectively; the Mg element is added in the form of pure metal, or in the form of Mg-25Gd, Mg-30Nd, and Mg-33Zr;

[0047] 2. The alloy ingot is subjected to solution treatment in an industrial pit furnace, with a solution temperature of 520°C, a solution time of 16 hours, and a cooling method of water cooling. After the solution treatment of the ingot, a billet for extrusion with a diameter of 80 mm and a length of 120 mm is obtained by turning; Figure 2 It can be seen that the solid solution alloy has almost no coarse eutectic phase and has excellent solid solution effect;

[0048] 3. The extruded billet is extruded into a shape by a horizontal extruder, the extrusion temperature is 450°C, the extrusion ratio is 9:1, the extrusion speed is 1m / min, the cooling method is air cooling, and a pre-extruded sheet with a length of 1m, a width of 56mm, and a thickness of 10mm is obtained. Figure 3 As shown in Figure 2, compared with the solid solution alloy, the grain size of the extruded alloy sheet is significantly refined; Figure 4 As shown, the extruded alloy sheet has similar room temperature mechanical properties in the transverse and longitudinal directions and has low anisotropy, which indicates that the mechanical properties of the pre-extruded alloy sheet are low anisotropy;

[0049] 4. Cut the pre-extruded sheet into sheets with a length of 80 mm, a width of 56 mm, and a thickness of 10 mm for rolling by wire cutting, and perform three passes of rolling along the extrusion direction at room temperature to obtain rolled sheets with a length of 90 mm, a width of 64 mm, and a thickness of 8.5 mm. The pressing amount for each pass is 5%, there is no intermediate heat treatment between passes, the roller diameter is 200 mm, and the rolling mill speed is 1200 rpm;

[0050] 5. The rolled plate is aged in an oil bath furnace at 160°C for 48 hours and air cooling. Figure 5 As shown, there are a large number of precipitates and dislocations in the matrix of the pre-extruded alloy sheet after room temperature rolling and aging treatment.

[0051] The room temperature mechanical properties of the deformed magnesium alloy sheet prepared in Specific Example 1 are: transverse yield strength, tensile strength and elongation at break are 312±2MPa, 347±10MPa and 6.6±1.7% respectively, and longitudinal yield strength, tensile strength and elongation at break are 304±7MPa, 364±5MPa and 6.2±0.7% respectively. In Example 1, the transverse and longitudinal yield strengths both exceed 300MPa, and the transverse to longitudinal yield strength ratio is 1.03, achieving high strength and low anisotropy.

[0052] Specific example 2:

[0053] The present invention is described in detail by taking a Mg-2.35Nd-1.32Gd-0.18Zn-0.32Zr wt.% alloy plate as an example. The preparation process includes alloy smelting, solution treatment, extrusion blanking, room temperature rolling and aging heat treatment.

[0054] 1. The alloy is melted in a resistance furnace and cast into a permanent mold preheated at 200°C at 745°C to obtain an alloy ingot with a diameter of 90 mm and a height of 155 mm. The Zn element is added in the form of pure metal, and the Nd, Gd, and Zr elements are added in the form of intermediate alloys Mg-25Gd, Mg-30Nd, and Mg-33Zr, respectively; the Mg element is added in the form of pure metal, or in the form of Mg-25Gd, Mg-30Nd, and Mg-33Zr;

[0055] 2. The alloy ingot is subjected to solution treatment in an industrial pit furnace, with a solution temperature of 520°C, a solution time of 16 hours, and a cooling method of water cooling. After solution treatment, the ingot is turned to obtain an extrusion billet with a diameter of 80 mm and a length of 120 mm;

[0056] 3. The extruded billet is extruded into a shape by a horizontal extruder, the extrusion temperature is 450°C, the extrusion ratio is 9:1, the extrusion speed is 1m / min, the cooling method is air cooling, and a pre-extruded plate with a length of 1m, a width of 56mm, and a thickness of 10mm is obtained.

[0057] 4. Cut the pre-extruded sheet into sheets with a length of 80 mm, a width of 56 mm, and a thickness of 10 mm for rolling by wire cutting, and perform two passes of rolling along the extrusion direction at room temperature to obtain a rolled sheet with a length of 88 mm, a width of 60 mm, and a thickness of 9 mm. The pressing amount for each pass is 5%, there is no intermediate heat treatment between passes, the roller diameter is 200 mm, and the rolling mill speed is 1200 rpm;

[0058] 5. The rolled plate is aged in an oil bath furnace at a temperature of 180°C for 16 h and air cooling.

[0059] The room temperature mechanical properties of the deformed magnesium alloy sheet prepared in Specific Example 2 are: transverse yield strength, tensile strength and elongation at break are 299±7MPa, 324±3MPa and 4.5±0.8% respectively, and longitudinal yield strength, tensile strength and elongation at break are 285±4MPa, 333±2MPa and 5.0±0.2% respectively. In Example 2, the transverse and longitudinal yield strengths are both over 280MPa, and the transverse to longitudinal yield strength ratio is 1.05, achieving high strength and low anisotropy.

[0060] Comparative Example 1:

[0061] The present invention is described in detail by taking a Mg-2.35Nd-1.32Gd-0.18Zn-0.32Zr wt.% alloy plate as an example. The preparation process includes alloy smelting, solution treatment, extrusion blanking and room temperature rolling.

[0062] 1. The alloy is melted in a resistance furnace and cast into a permanent mold preheated at 200°C at 745°C to obtain an alloy ingot with a diameter of 90 mm and a height of 155 mm. The Zn element is added in the form of pure metal, and the Nd, Gd, and Zr elements are added in the form of intermediate alloys Mg-25Gd, Mg-30Nd, and Mg-33Zr, respectively; the Mg element is added in the form of pure metal, or in the form of Mg-25Gd, Mg-30Nd, and Mg-33Zr;

[0063] 2. The alloy ingot is subjected to solution treatment in an industrial pit furnace, with a solution temperature of 520°C, a solution time of 16 hours, and a cooling method of water cooling. After solution treatment, the ingot is turned to obtain an extrusion billet with a diameter of 80 mm and a length of 120 mm;

[0064] 3. The extruded billet is extruded into a shape by a horizontal extruder, the extrusion temperature is 450°C, the extrusion ratio is 9:1, the extrusion speed is 1m / min, the cooling method is air cooling, and a pre-extruded plate with a length of 1m, a width of 56mm, and a thickness of 10mm is obtained;

[0065] 4. The pre-extruded sheet was cut into sheets with a length of 80 mm, a width of 56 mm, and a thickness of 10 mm by wire cutting, and rolled in the extrusion direction for 3 passes at room temperature to obtain a rolled sheet with a length of 90 mm, a width of 64 mm, and a thickness of 8.5 mm. The pressing amount for each pass was 5%, there was no intermediate heat treatment between passes, the roller diameter was 200 mm, and the rolling mill speed was 1200 rpm.

[0066] The room temperature mechanical properties of the deformed magnesium alloy sheet prepared in Comparative Example 1 are: transverse yield strength, tensile strength and elongation at break are 249±4MPa, 289±5MPa and 6.9±1.4% respectively, and longitudinal yield strength, tensile strength and elongation at break are 234±6MPa, 304±8MPa and 10.6±1.1% respectively. The ratio of transverse to longitudinal yield strength of the alloy in Comparative Example 1 is 1.07, and the strength is lower than that of Examples 1 and 2. The room temperature mechanical properties of Comparative Example 1 are significantly lower than those of Examples 1 and 2.

[0067] Comparative Example 2:

[0068] The present invention is described in detail by taking a Mg-2.35Nd-1.32Gd-0.18Zn-0.32Zr wt.% alloy plate as an example. The preparation process includes alloy smelting, solution treatment and room temperature rolling.

[0069] 1. The alloy is melted in a resistance furnace and cast into a permanent mold preheated at 200°C at 745°C to obtain an alloy ingot with a diameter of 90 mm and a height of 155 mm. The Zn element is added in the form of pure metal, and the Nd, Gd, and Zr elements are added in the form of intermediate alloys Mg-25Gd, Mg-30Nd, and Mg-33Zr, respectively; the Mg element is added in the form of pure metal or in the form of Mg-25Gd, Mg-30Nd, and Mg-33Zr;

[0070] 2. The alloy ingot is subjected to solution treatment in an industrial pit furnace, with a solution temperature of 520°C, a solution time of 16 hours, and a cooling method of water cooling. After solution treatment, the ingot is turned to obtain an extrusion billet with a diameter of 80 mm and a length of 120 mm;

[0071] 3. The solution treated ingot was cut into plates with a length of 80 mm, a width of 56 mm, and a thickness of 10 mm by wire cutting, and two passes of unidirectional rolling were performed at room temperature to obtain rolled plates with a length of 95 mm, a width of 67 mm, and a thickness of 8 mm. The pressing amount for each pass was 10%, there was no intermediate heat treatment between passes, the roll diameter was 200 mm, and the rolling mill speed was 1200 rpm.

[0072] The room temperature mechanical properties of the deformed magnesium alloy sheet prepared in Comparative Example 2 are: transverse yield strength, tensile strength and elongation at break are 264±3MPa, 294±4MPa and 2.15±1.4% respectively, and longitudinal yield strength, tensile strength and elongation at break are 219±5MPa, 285±4MPa and 6.1±0.2% respectively. The ratio of transverse to longitudinal yield strength of the alloy in Comparative Example 2 is 1.21, the room temperature mechanical properties are obviously anisotropic, and the strength is lower than that of Examples 1 and 2. The room temperature mechanical properties of Comparative Example 2 are significantly lower than those of Examples 1 and 2.

[0073] By comparing specific example 1 with comparative example 1, it can be found that the strength of the alloy plate is significantly improved after aging treatment.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a high-strength deformable magnesium alloy sheet with low anisotropy at room temperature, characterized in that: The following steps are involved: Step 1, smelting the magnesium alloy and casting it to obtain a magnesium alloy ingot; Step 2: subjecting the magnesium alloy ingot to solution heat treatment at a solution temperature of 510 to 530° C. and a solution time of 10 to 16 hours, and obtaining an ingot after cooling; Step 3, under the conditions of extrusion temperature of 420-480°C, extrusion ratio of 6:1-18:1, and extrusion speed of 0.5-1.5 m / min, the billet is extruded and opened, and the pre-extruded sheet is obtained after air cooling; Step 4, rolling the pre-extruded sheet along the extrusion direction at room temperature, with 1 to 3 rolling passes and a single-pass pressing amount of 5 to 10%; Step 5: Perform aging heat treatment on the pre-extruded plate after rolling at an aging temperature of 150-200° C. and an aging time of 16-48 hours, and obtain a high-strength deformable magnesium alloy plate after air cooling to room temperature.

2. The method for preparing a high-strength deformable magnesium alloy sheet with low anisotropy at room temperature according to claim 1, characterized in that: The smelting in step 1 is carried out in a resistance furnace. The Zn element of the magnesium alloy is added to the smelting in the form of pure metal; Nd, Gd, and Zr elements are added to the smelting in the form of intermediate alloys Mg-25Gd, Mg-30Nd, and Mg-33Zr, respectively; and the Mg element is added to the smelting in the form of pure metal, or in the form of Mg-25Gd, Mg-30Nd, and Mg-33Zr.

3. The method for preparing a high-strength deformable magnesium alloy sheet with low anisotropy at room temperature as claimed in claim 1, characterized in that: The alloy ingot in step 1 is cast by gravity casting, and the casting temperature after smelting is 740-760°C.

4. The method for preparing a high-strength deformable magnesium alloy sheet with low anisotropy at room temperature as claimed in claim 3, characterized in that: The casting process is specifically to cast at 740-760° C. into a permanent mold preheated at 150-225° C. to obtain an alloy ingot with a diameter of 85-95 mm and a height of 140-160 mm.

5. The method for preparing a high-strength deformable magnesium alloy sheet with low anisotropy at room temperature as claimed in claim 1, characterized in that: The solution heat treatment described in step 2 is carried out in an industrial pit furnace. After water cooling, an ingot with a diameter of 79 to 81 mm and a length of 110 to 130 mm is obtained by turning.

6. The method for preparing a high-strength deformable magnesium alloy sheet with low anisotropy at room temperature as claimed in claim 1, characterized in that: In step 3, the preheating temperature before extrusion during billet extrusion is the same as the extrusion temperature, and the preheating time is 0.25 to 1 hour. The length of the obtained pre-extruded plate is 0.6 to 1.8 m, the width is 54 to 58 mm, and the thickness is 5 to 15 mm.

7. The method for preparing a high-strength deformable magnesium alloy sheet with low anisotropy at room temperature as claimed in claim 1, characterized in that: The step three also includes cutting the pre-extruded plate into plates with a length of 78 to 82 mm, a width of 54 to 58 mm, and a thickness of 5 to 15 mm for rolling by wire cutting.

8. The method for preparing a high-strength deformable magnesium alloy sheet with low anisotropy at room temperature according to any one of claims 1 to 7, characterized in that: There is no intermediate heat treatment between the rolling passes described in step 4, the roller diameter is 150-250 mm, and the rolling mill speed is 1000-1300 rpm.

9. A high-strength deformable magnesium alloy sheet with low anisotropy at room temperature obtained by the preparation method according to claims 1-8, characterized in that: The alloy components of the magnesium alloy plate include, by weight percentage, 2.0-3.0% of neodymium, 0.8-1.7% of gadolinium, 0.05-0.4% of zinc, 0.15-0.6% of zirconium, and the rest are magnesium and impurities.

10. The high-strength deformable magnesium alloy sheet with low anisotropy at room temperature as claimed in claim 9, characterized in that: The alloy composition of the magnesium alloy plate is Mg-2.35Nd-1.32Gd-0.18Zn-0.32Zr wt.%.

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