Corrosion-resistant and high-plasticity magnesium alloy and preparation method thereof

Abstract

The invention provides a corrosion-resistant and high-plasticity magnesium alloy and a preparation method thereof, and belongs to the technical field of alloy materials. The dynamic recrystallization behavior and texture evolution of the magnesium alloy are effectively influenced by adding rare earth elements, and the basal texture is successfully weakened by combining the subsequent deformation and heat treatment processes, so that the magnesium alloy has more uniform mechanical properties in multiple directions, and the plasticity and corrosion resistance of the magnesium alloy are remarkably improved. In addition, the preparation process is simple and suitable for large-scale production.

Description

Technical Field

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

[0002] Magnesium alloys are widely used in lightweight structural materials due to their low density, high specific strength and good machinability. However, magnesium alloys are prone to produce strong basal textures during the forming process, which can lead to the anisotropy of the material and affect its mechanical properties, especially plasticity and corrosion resistance.

[0003] Existing technologies adjust texture by regulating deformation and heat treatment processes, but there are still certain limitations, especially for extruded plates, whose texture is particularly obvious and has a great impact on the corrosion properties of magnesium alloys. Especially in large-scale industrial applications, the texture strength cannot be completely eliminated.

[0004] The present invention effectively affects the dynamic recrystallization behavior and texture evolution of the magnesium alloy by adding rare earth elements, and significantly reduces the texture strength of the magnesium alloy and improves the corrosion resistance and mechanical properties of the magnesium alloy by combining the subsequent deformation and heat treatment processes. In addition, the present invention has a simple preparation process and is suitable for large-scale production. Summary of the invention

[0005] The present invention provides a corrosion-resistant, high-plasticity magnesium alloy and a preparation method thereof, which are used to solve the technical problems of poor corrosion resistance and low plasticity of magnesium alloys in the prior art.

[0006] In one aspect, the present invention provides a corrosion-resistant, high-plasticity magnesium alloy, which is composed of the following components in percentage by mass: Yttrium 2~6wt%; Neodymium 2~5wt%; The balance is magnesium and unavoidable impurities.

[0007] On the other hand, the present invention also provides a method for preparing a corrosion-resistant, high-plasticity magnesium alloy, comprising the following steps: (1) According to the elemental composition of the magnesium alloy, pure magnesium, Mg-30Y master alloy and Mg-30Nd master alloy are weighed and preheated; (2) Under the protection of nitrogen, pure magnesium is heated and melted, the furnace temperature is increased, and the Mg-30Y master alloy and the Mg-30Nd master alloy are sequentially added into the molten magnesium for smelting to obtain a metallurgical melt; (3) Under the protection of nitrogen, the metallurgical melt is injected into a preheated mold and cooled to obtain an ingot; (4) Under the protection of nitrogen, the ingot is subjected to the first heat treatment; (5) After the first heat treatment, the three mutually perpendicular directions of the ingot are set as the X direction, the Y direction and the Z direction, and after the ingot is heated, the ingot is upset in the X direction, the Y direction and the Z direction of the ingot in sequence, and the upset ingot is stretched in the X direction, the Y direction and the Z direction of the ingot in sequence; (6) heating the ingot again, upsetting the ingot in the X, Y and Z directions in sequence, and stretching the upset ingot in the X, Y and Z directions in sequence to obtain a forged alloy; (7) The forged alloy is placed in a heat treatment furnace for a second heat treatment to obtain a magnesium alloy.

[0008] According to a method for preparing a corrosion-resistant, high-plasticity magnesium alloy provided by the present invention, in the step (1), the temperature of the preheating treatment is 200-300°C.

[0009] According to a method for preparing a corrosion-resistant, high-plasticity magnesium alloy provided by the present invention, in the step (2), the furnace temperature for heating and melting pure magnesium is 650-700°C, and the furnace temperature for smelting is 680-750°C.

[0010] According to a method for preparing a corrosion-resistant, high-plasticity magnesium alloy provided by the present invention, in the step (3), the mold is preheated to a temperature of 200-300°C.

[0011] According to a method for preparing a corrosion-resistant, high-plasticity magnesium alloy provided by the present invention, in the step (4), the temperature of the first heat treatment is 520°C, the heating rate of the first heat treatment is 20-50°C / hour, and the holding time of the first heat treatment is 24 hours.

[0012] According to a method for preparing a corrosion-resistant, high-plasticity magnesium alloy provided by the present invention, in the steps (5) and (6), the ingot is heated to a temperature of 400° C., and the ingot is heated and kept warm for 24 hours. The heating can be repeated during the upsetting and drawing processes to maintain the ingot temperature.

[0013] According to a method for preparing a corrosion-resistant, high-plasticity magnesium alloy provided by the present invention, in step (5) and step (6), the unidirectional deformation amount of upsetting and drawing is 50%.

[0014] According to a method for preparing a corrosion-resistant, high-plasticity magnesium alloy provided by the present invention, in the step (7), the temperature of the second heat treatment is 220° C., and the holding time of the second heat treatment is 60 hours.

[0015] The present invention provides a corrosion-resistant, high-plasticity magnesium alloy and a preparation method thereof, which solves the technical problems of low plasticity and poor corrosion resistance of magnesium alloys in the prior art by adding rare earth elements and performing deformation and heat treatment processes, thereby achieving the beneficial effect of improving the corrosion resistance and plasticity of the magnesium alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 The pole figure and the anti-pole figure of the magnesium alloy provided in Example 1 of the present invention are: (a) is the pole figure of the magnesium alloy provided in Example 1; (b) is the anti-pole figure of the magnesium alloy provided in Example 1; Figure 2 The pole figure and the inverse pole figure of the magnesium alloy provided in Comparative Example 1 of the present invention are: (a) is the pole figure of the magnesium alloy provided in Comparative Example 1; (b) is the inverse pole figure of the magnesium alloy provided in Comparative Example 1; Figure 3 3 is a scanning electron microscope image of the magnesium alloy provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Combine the following Figure 1-Figure 3 The present invention is described.

[0020] Figure 1 These are the pole figure and anti-pole figure of the magnesium alloy provided in Example 1 of the present invention, wherein (a) is the pole figure of the magnesium alloy provided in Example 1, and (b) is the anti-pole figure of the magnesium alloy provided in Example 1. Figure 2 These are the pole figure and anti-pole figure of the magnesium alloy provided in Comparative Example 1 of the present invention, (a) is the pole figure of the magnesium alloy provided in Comparative Example 1, and (b) is the anti-pole figure of the magnesium alloy provided in Comparative Example 1.

[0021] contrast Figure 1 and Figure 2It can be seen that, compared with the magnesium alloy provided in comparative example 1 of the present invention, the magnesium alloy provided in embodiment 1 of the present invention has a wider crystal phase distribution and a significantly reduced texture strength. Figure 1 (a) and Figure 2 (a), the texture strength of the magnesium alloy provided by Example 1 of the present invention is 3.51, and the texture strength of the magnesium alloy provided by Comparative Example 1 of the present invention is 5.31; Figure 1 (b) and Figure 2 (b) The texture strength of the magnesium alloy provided in Example 1 of the present invention is 1.77, and the texture strength of the magnesium alloy provided in Comparative Example 1 of the present invention is 5.13.

[0022] Figure 3 3 is a scanning electron microscope image of the magnesium alloy provided in Example 1 of the present invention.

[0023] like Figure 3 As shown, the corrosion film layer of the magnesium alloy provided in Example 1 of the present invention has good compactness.

[0024] In one aspect, the present invention provides a corrosion-resistant, high-plasticity magnesium alloy, which is composed of the following components in percentage by mass: Yttrium 2~6wt%; Neodymium 2~5wt%; The balance is magnesium and unavoidable impurities.

[0025] On the other hand, the present invention also provides a method for preparing a corrosion-resistant, high-plasticity magnesium alloy, comprising the following steps: (1) According to the elemental composition of the magnesium alloy, pure magnesium, Mg-30Y master alloy and Mg-30Nd master alloy are weighed and preheated; (2) Under the protection of nitrogen, pure magnesium is heated and melted, the furnace temperature is increased, and the Mg-30Y master alloy and the Mg-30Nd master alloy are sequentially added into the molten magnesium for smelting to obtain a metallurgical melt; (3) Under the protection of nitrogen, the metallurgical melt is injected into a preheated mold and cooled to obtain an ingot; (4) Under the protection of nitrogen, the ingot is subjected to the first heat treatment; (5) After the first heat treatment, the three mutually perpendicular directions of the ingot are set as the X direction, the Y direction and the Z direction, and after the ingot is heated, the ingot is upset in the X direction, the Y direction and the Z direction of the ingot in sequence, and the upset ingot is stretched in the X direction, the Y direction and the Z direction of the ingot in sequence; (6) heating the ingot again, upsetting the ingot in the X, Y and Z directions in sequence, and stretching the upset ingot in the X, Y and Z directions in sequence to obtain a forged alloy; (7) The forged alloy is placed in a heat treatment furnace for a second heat treatment to obtain a magnesium alloy.

[0026] According to a method for preparing a corrosion-resistant, high-plasticity magnesium alloy provided by the present invention, in the step (1), the temperature of the preheat treatment is 200-300°C, preferably 220-280°C, and more preferably 240-260°C.

[0027] According to a method for preparing a corrosion-resistant, high-plasticity magnesium alloy provided by the present invention, in the step (2), the furnace temperature for heating and melting pure magnesium is 650-700°C, preferably 660-690°C, and more preferably 670-680°C; the furnace temperature for smelting is 680-750°C, preferably 690-730°C, and more preferably 710-720°C.

[0028] According to a method for preparing a corrosion-resistant, high-plasticity magnesium alloy provided by the present invention, in the step (3), the mold is preheated to a temperature of 200-300°C, preferably 220-280°C, and more preferably 240-260°C.

[0029] According to a method for preparing a corrosion-resistant, high-plasticity magnesium alloy provided by the present invention, in the step (4), the temperature of the first heat treatment is 520°C, the heating rate of the first heat treatment is 20-50°C / hour, preferably 30-40°C, and the holding time of the first heat treatment is 24 hours.

[0030] According to a method for preparing a corrosion-resistant, high-plasticity magnesium alloy provided by the present invention, in the steps (5) and (6), the ingot is heated to a temperature of 400° C., and the ingot is heated and kept warm for 24 hours. The heating can be repeated during the upsetting and drawing processes to maintain the ingot temperature.

[0031] According to a method for preparing a corrosion-resistant, high-plasticity magnesium alloy provided by the present invention, in step (5) and step (6), the unidirectional deformation amount of upsetting and drawing is 50%.

[0032] According to a method for preparing a corrosion-resistant, high-plasticity magnesium alloy provided by the present invention, in the step (7), the temperature of the second heat treatment is 220° C., and the holding time of the second heat treatment is 60 hours.

[0033] Example 1 3.65 kg of pure magnesium, 1.6 kg of Mg-30Y master alloy and 0.75 kg of Mg-30Nd master alloy were weighed and preheated to 250°C. Under the protection of nitrogen, the furnace temperature was raised to 680°C to heat and melt the pure magnesium. The furnace temperature was raised to 700°C again, and the Mg-30Y master alloy and the Mg-30Nd master alloy were successively put into the molten magnesium for smelting to obtain a metallurgical melt. Under the protection of nitrogen, the metallurgical melt was injected into a mold preheated to 250°C, and cooled to obtain an ingot; the ingot was heated to 520°C at a heating rate of 20°C / hour, kept warm for 24 hours, and then water quenched. The three mutually perpendicular directions of the ingot are set as the X direction, the Y direction and the Z direction, and the ingot is heated to 400°C. After being kept warm for 24 hours, the ingot is upset in the X direction, the Y direction and the Z direction of the ingot in turn, and the upset ingot is stretched in the X direction, the Y direction and the Z direction of the ingot in turn, and the ingot is upset again in the X direction, the Y direction and the Z direction of the ingot in turn, and the upset ingot is stretched in the X direction, the Y direction and the Z direction of the ingot in turn, and the heating can be repeated during the upsetting and stretching process to maintain the ingot temperature, and the unidirectional deformation of each upsetting and stretching is 50%, and the forged alloy is obtained. The forged alloy is placed in a heat treatment furnace and heated to 220°C, and kept warm for 60 hours to obtain a corrosion-resistant and high-plasticity magnesium alloy.

[0034] After testing, the chemical composition of the corrosion-resistant and high-plasticity magnesium alloy provided in this embodiment is as follows: Y 4wt%, Nd 3wt%, and the balance is magnesium and inevitable impurities.

[0035] According to the test, the corrosion-resistant and high-plasticity magnesium alloy provided in this embodiment has a neutral salt spray corrosion rate of 0.005 mg / (d·cm 2 ), yield strength is 300 MPa, tensile strength is 320 MPa, and elongation is 15%.

[0036] Example 2 Weigh 3 kg of pure magnesium, 2 kg of Mg-30Y master alloy and 1 kg of Mg-30Nd master alloy, and preheat to 250°C. Under the protection of nitrogen, raise the furnace temperature to 680°C to heat and melt the pure magnesium. Raise the furnace temperature to 700°C again, and successively put the Mg-30Y master alloy and Mg-30Nd master alloy into the molten magnesium for smelting to obtain a metallurgical melt. Under the protection of nitrogen, inject the metallurgical melt into a mold preheated to 250°C, cool it to obtain an ingot; heat the ingot to 520°C at a heating rate of 35°C / hour, keep it warm for 24 hours, and then water quench it. The three mutually perpendicular directions of the ingot are set as the X direction, the Y direction and the Z direction, and the ingot is heated to 400°C. After being kept warm for 24 hours, the ingot is upset in the X direction, the Y direction and the Z direction of the ingot in turn, and the upset ingot is stretched in the X direction, the Y direction and the Z direction of the ingot in turn, and the ingot is upset again in the X direction, the Y direction and the Z direction of the ingot in turn, and the upset ingot is stretched in the X direction, the Y direction and the Z direction of the ingot in turn, and the heating can be repeated during the upsetting and stretching process to maintain the ingot temperature, and the unidirectional deformation of each upsetting and stretching is 50%, and the forged alloy is obtained. The forged alloy is placed in a heat treatment furnace and heated to 220°C, and kept warm for 60 hours to obtain a corrosion-resistant and high-plasticity magnesium alloy.

[0037] After testing, the chemical composition of the corrosion-resistant and high-plasticity magnesium alloy provided in this embodiment is as follows: Y 5wt%, Nd 4wt%, and the balance is magnesium and inevitable impurities.

[0038] According to the test, the corrosion-resistant and high-plasticity magnesium alloy provided in this embodiment has a neutral salt spray corrosion rate of 0.02 mg / (d·cm 2 ), yield strength is 320 MPa, tensile strength is 380 MPa, and elongation is 15%.

[0039] Example 3 Weigh 4.3 kg of pure magnesium, 1.2 kg of Mg-30Y master alloy and 0.5 kg of Mg-30Nd master alloy, and preheat to 250°C. Under the protection of nitrogen, raise the furnace temperature to 680°C to heat and melt the pure magnesium. Raise the furnace temperature to 700°C again, and successively put the Mg-30Y master alloy and Mg-30Nd master alloy into the molten magnesium for smelting to obtain a metallurgical melt. Under the protection of nitrogen, inject the metallurgical melt into a mold preheated to 250°C, cool it to obtain an ingot; heat the ingot to 520°C at a heating rate of 20°C / hour, keep it warm for 24 hours, and then water quench it. The three mutually perpendicular directions of the ingot are set as the X direction, the Y direction and the Z direction, and the ingot is heated to 400°C. After being kept warm for 24 hours, the ingot is upset in the X direction, the Y direction and the Z direction of the ingot in turn, and the upset ingot is stretched in the X direction, the Y direction and the Z direction of the ingot in turn, and the ingot is upset again in the X direction, the Y direction and the Z direction of the ingot in turn, and the upset ingot is stretched in the X direction, the Y direction and the Z direction of the ingot in turn, and the heating can be repeated during the upsetting and stretching process to maintain the ingot temperature, and the unidirectional deformation of each upsetting and stretching is 50%, and the forged alloy is obtained. The forged alloy is placed in a heat treatment furnace and heated to 220°C, and kept warm for 60 hours to obtain a corrosion-resistant and high-plasticity magnesium alloy.

[0040] After testing, the chemical composition of the corrosion-resistant and high-plasticity magnesium alloy provided in this embodiment is as follows: Y 3wt%, Nd 2wt%, and the remainder is magnesium and inevitable impurities.

[0041] After testing, the corrosion-resistant and high-plasticity magnesium alloy provided in this embodiment has a neutral salt spray corrosion rate of 0.01 mg / (d·cm 2 ), yield strength is 280 MPa, tensile strength is 300 MPa, and elongation is 10%.

[0042] Comparative Example 1 Weigh 2.95 kg of pure magnesium, 2.8 kg of Mg-30Y master alloy and 0.25 kg of Mg-30Nd master alloy, and preheat to 250°C. Under the protection of nitrogen, raise the furnace temperature to 680°C to heat and melt the pure magnesium. Raise the furnace temperature to 700°C again, and successively put the Mg-30Y master alloy and Mg-30Nd master alloy into the molten magnesium for smelting to obtain a metallurgical melt. Under the protection of nitrogen, inject the metallurgical melt into a mold preheated to 250°C, cool it to obtain an ingot; heat the ingot to 520°C at a heating rate of 20°C / hour, keep it warm for 16 hours, and then water quench it. The three mutually perpendicular directions of the ingot are set as X, Y and Z directions, the ingot is heated to 400°C, and after keeping warm for 24 hours, the ingot is upset in the X, Y and Z directions in turn, the upsetting ingot is stretched in the X, Y and Z directions in turn, the ingot is upset again in the X, Y and Z directions in turn, the upsetting ingot is stretched in the X, Y and Z directions in turn, the heating can be repeated during the upsetting and stretching process to maintain the ingot temperature, the unidirectional deformation of each upsetting and stretching is 50%, and a forging alloy is obtained.

[0043] After testing, the chemical composition of the magnesium alloy provided in this comparative example is as follows: Y 7wt%, Nd 1wt%, and the balance being magnesium and unavoidable impurities.

[0044] After testing, the neutral salt spray corrosion rate of the magnesium alloy provided in this comparative example is 0.03 mg / (d·cm 2 ), the yield strength is 202 MPa, the tensile strength is 254 MPa, and the elongation is 11%.

[0045] Comparative Example 2 3.8 kg of pure magnesium, 1.2 kg of Mg-30Y master alloy and 2 kg of Mg-30Nd master alloy were weighed and preheated to 250°C. Under the protection of nitrogen, the furnace temperature was raised to 680°C to heat and melt the pure magnesium. The furnace temperature was raised to 700°C again, and the Mg-30Y master alloy and the Mg-30Nd master alloy were successively put into the molten magnesium for smelting to obtain a metallurgical melt. Under the protection of nitrogen, the metallurgical melt was injected into a mold preheated to 250°C, and cooled to obtain an ingot; the ingot was heated to 520°C at a heating rate of 20°C / hour, and after keeping warm for 16 hours, it was water quenched to obtain a magnesium alloy.

[0046] After testing, the chemical composition of the magnesium alloy provided in this comparative example is as follows: Y 3wt%, Nd 8wt%, and the balance is magnesium and unavoidable impurities.

[0047] After testing, the neutral salt spray corrosion rate of the magnesium alloy provided in this comparative example is 0.05 mg / (d·cm2 ), the yield strength is 248 MPa, the tensile strength is 281 MPa, and the elongation is 8%.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A corrosion-resistant, high-plasticity magnesium alloy, characterized in that: The corrosion-resistant, high-plasticity magnesium alloy is composed of the following components in percentage by mass: Yttrium 2~6wt%; Neodymium 2~5wt%; The balance is magnesium and unavoidable impurities; The method for preparing a corrosion-resistant and highly plastic magnesium alloy comprises the following steps: (1) According to the elemental composition of the magnesium alloy, pure magnesium, Mg-30Y master alloy and Mg-30Nd master alloy are weighed and preheated; (2) Under the protection of nitrogen, pure magnesium is heated and melted, the furnace temperature is increased, and the Mg-30Y master alloy and the Mg-30Nd master alloy are sequentially added into the molten magnesium for smelting to obtain a metallurgical melt; (3) Under the protection of nitrogen, the metallurgical melt is injected into a preheated mold and cooled to obtain an ingot; (4) Under the protection of nitrogen, the ingot is subjected to the first heat treatment; (5) After the first heat treatment, the three mutually perpendicular directions of the ingot are set as the X direction, the Y direction and the Z direction. After the ingot is heated, it is upset in the X direction, the Y direction and the Z direction of the ingot in sequence, and then the upset ingot is stretched in the X direction, the Y direction and the Z direction of the ingot in sequence; (6) heating the ingot again, upsetting the ingot in the X, Y and Z directions in sequence, and then stretching the upset ingot in the X, Y and Z directions in sequence to obtain a forging alloy; (7) The forged alloy is placed in a heat treatment furnace for a second heat treatment to obtain a magnesium alloy.

2. The method for preparing a corrosion-resistant, high-plasticity magnesium alloy according to claim 1, characterized in that: The following steps are involved: (1) According to the elemental composition of the magnesium alloy, pure magnesium, Mg-30Y master alloy and Mg-30Nd master alloy are weighed and preheated; (2) Under the protection of nitrogen, pure magnesium is heated and melted, the furnace temperature is increased, and the Mg-30Y master alloy and the Mg-30Nd master alloy are sequentially added into the molten magnesium for smelting to obtain a metallurgical melt; (3) Under the protection of nitrogen, the metallurgical melt is injected into a preheated mold and cooled to obtain an ingot; (4) Under the protection of nitrogen, the ingot is subjected to the first heat treatment; (5) After the first heat treatment, the three mutually perpendicular directions of the ingot are set as the X direction, the Y direction and the Z direction, and after the ingot is heated, the ingot is upset in the X direction, the Y direction and the Z direction of the ingot in sequence, and the upset ingot is stretched in the X direction, the Y direction and the Z direction of the ingot in sequence; (6) heating the ingot again, upsetting the ingot in the X, Y and Z directions in sequence, and stretching the upset ingot in the X, Y and Z directions in sequence to obtain a forged alloy; (7) The forged alloy is placed in a heat treatment furnace for a second heat treatment to obtain a magnesium alloy.

3. The method for preparing a corrosion-resistant, high-plasticity magnesium alloy according to claim 2, characterized in that: In the step (1), the temperature of the preheating treatment is 200-300°C.

4. The method for preparing a corrosion-resistant, high-plasticity magnesium alloy according to claim 2, characterized in that: In the step (2), the furnace temperature for heating and melting pure magnesium is 650-700°C, and the furnace temperature for smelting is 680-750°C.

5. The method for preparing a corrosion-resistant and highly plastic magnesium alloy according to claim 2, characterized in that: In the step (3), the mold is preheated to a temperature of 200-300°C.

6. The method for preparing a corrosion-resistant, high-plasticity magnesium alloy according to claim 2, characterized in that: In the step (4), the temperature of the first heat treatment is 520°C, the heating rate of the first heat treatment is 20-50°C / hour, and the insulation time of the first heat treatment is 24 hours.

7. The method for preparing a corrosion-resistant, high-plasticity magnesium alloy according to claim 2, characterized in that: In the steps (5) and (6), the ingot is heated to a temperature of 400° C. The ingot is heated and kept warm for 24 hours. The ingot can be heated repeatedly during the upsetting and drawing process to maintain the ingot temperature.

8. The method for preparing a corrosion-resistant and highly plastic magnesium alloy according to claim 2, characterized in that: In the steps (5) and (6), the unidirectional deformation amount of upsetting and drawing is 50%.

9. The method for preparing a corrosion-resistant, high-plasticity magnesium alloy according to claim 2, characterized in that: In the step (7), the temperature of the second heat treatment is 220° C., and the insulation time of the second heat treatment is 60 hours.

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