Electric arc additive manufacturing rare earth magnesium alloy wire and preparation method thereof

Abstract

The invention discloses an electric arc additive manufacturing rare earth magnesium alloy wire and a preparation method thereof, and relates to the technical field of metal material additive manufacturing, and the wire comprises the following components in percentage by mass: 12.0-14.0% of gadolinium Gd, 4.2-5.5% of yttrium Y, 2.5-3.5% of zinc Zn, 0.8-1.2% of zirconium Zr, less than or equal to 0.1% of other single impurity elements, less than or equal to 0.2% of other impurity elements, and the balance of Mg. The high-quality rare earth magnesium alloy wire is prepared from the raw materials according to the proportion of the alloy components through the steps of burdening, total smelting, rod-shaped casting, homogenization treatment, forging machining, extrusion machining, drawing machining and scaling machining, and after electric arc additive forming and solid solution aging, the warm tensile strength of a component is larger than 365 MPa, the yield strength is larger than 290 MPa, the ductility is larger than 10%, and the tensile strength of the component is larger than 290 MPa. And no plasticity anisotropy exists in the transverse direction and the longitudinal direction, and the high-performance electric arc additive manufacturing requirement of the rare earth magnesium alloy is met.

Description

Technical Field

[0001] The present application belongs to the field of additive manufacturing of metal materials, and specifically relates to an arc additive manufacturing rare earth magnesium alloy wire and a preparation method thereof. Background Art

[0002] Magnesium alloys have excellent properties such as high specific strength, high specific stiffness, good shock absorption performance, good electromagnetic shielding performance, good damping and good recyclability, and are widely used in aerospace, automobile, new energy and other fields. Compared with traditional magnesium alloys, heavy rare earth elements in heavy rare earth magnesium alloys have obvious strengthening effects, and their room temperature and high temperature performance are better. They have become the preferred material for high-performance manufacturing of aerospace equipment. At present, large heavy rare earth magnesium alloy components are mainly manufactured by casting + subsequent machining. There are certain limitations in the manufacture of large and complex heavy rare earth magnesium alloy components. First, there are component segregation and hole defects in local positions of large heavy rare earth magnesium alloy components, and it is difficult to maintain consistency in organization and composition; second, there are differences in the mechanical properties of various parts of large and complex heavy rare earth magnesium alloy components, and the overall performance is low. With the continuous development of the high-performance requirements of aerospace components, the comprehensive performance requirements of heavy rare earth magnesium alloy components are getting higher and higher.

[0003] Arc additive manufacturing is a new type of digital manufacturing technology. It is based on a three-dimensional model and uses arc as a heat source to stack wires layer by layer along a planned path to form dense metal components, and then a small amount of machining is used to complete the manufacturing of parts. It has the characteristics of high material utilization, high forming efficiency, low manufacturing cost, and good mechanical properties of formed components. It is especially suitable for the manufacture of large and complex heavy rare earth magnesium alloy components in aerospace. In the process of arc additive manufacturing, the components undergo complex thermal cycles such as rapid melting / rapid solidification / local short heat treatment, which puts forward new requirements for the quality of heavy rare earth magnesium alloy wires. Therefore, it is urgent to develop special wires for arc additive manufacturing of complex heavy rare earth magnesium alloy components.

[0004] Patent CN114717458B discloses a rare earth magnesium alloy wire suitable for arc additive manufacturing and its preparation method. The invention is based on rare earth magnesium alloy cast rods, and prepares magnesium alloy wires with equal diameter, slender structure and uniform structure through homogenization, forging, extrusion, drawing, annealing and peeling. Patent CN114798800A discloses a preparation process for heavy rare earth magnesium alloy wire for arc additive manufacturing. The invention is based on heavy rare earth magnesium alloy raw materials, and prepares high-quality heavy rare earth magnesium alloy wires through raw material smelting, extrusion, drawing and post-treatment. Patent CN114798799A discloses a method for preparing rare earth magnesium alloy wire suitable for arc additive manufacturing. The invention is based on rare earth magnesium alloy thick wire (Φ4-6mm), and prepares rare earth magnesium alloy wire (Φ1-1.5mm) with good surface quality and equal diameter and slenderness through thick wire drawing, butt welding connection and heat treatment, thin wire drawing and peeling treatment.

[0005] The rare earth magnesium alloy wires for arc additive manufacturing that have been published so far mainly play the role of solid solution strengthening and aging precipitation strengthening of the Mg matrix by adding heavy rare earth elements Gd and Y (such as gadolinium Gd: 8.0-12.0%, yttrium Y: 2.5-4.5%). At the same time, Gd and Y elements can weaken the basal plane texture in the matrix, improve the sliding ability of the main slip system and the side slip system, and improve the strength and plasticity of the rare earth magnesium alloy. The heavy rare earth element addition amount of the heavy rare earth magnesium alloy wires for arc additive manufacturing that have been published so far is relatively low, and the performance of the arc additively formed components cannot meet the manufacturing requirements of high-strength and tough components for aerospace. The preparation method of wires with high addition of heavy rare earth elements is significantly different from the existing preparation methods, so it is necessary to provide a preparation method for high-strength and tough heavy rare earth magnesium alloy arc additive forming wires. Summary of the invention

[0006] The technical problem solved by the present application is: to overcome the shortcomings of the prior art and provide an arc additively manufactured rare earth magnesium alloy wire and a preparation method thereof. The rare earth magnesium alloy wire prepared by this method has uniform composition and structure, good surface quality, and after arc additive forming and solution aging heat treatment, its room temperature tensile strength is greater than 365MPa, its yield strength is greater than 290MPa, its elongation is greater than 10%, and there is no plastic anisotropy in the transverse and longitudinal directions, which meets the high-performance manufacturing needs of aerospace.

[0007] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0008] An arc additively manufactured rare earth magnesium alloy wire comprises, by mass percentage, 12.0-14.0% gadolinium Gd, 4.2-5.5% yttrium Y, 1.5-2.5% zinc Zn, 0.8-1.2% zirconium Zr, ≤0.1% of other single impurity elements, ≤0.2% of other impurity elements in total, and the remainder is Mg.

[0009] An arc additively manufactured rare earth magnesium alloy wire comprises, by mass percentage, 12.0-13.0% gadolinium Gd, 4.5-5.0% yttrium Y, 1.5-2.0% zinc Zn, 0.8-1.0% zirconium Zr, and other single impurity elements ≤0.1%, and the rest of the impurity elements total ≤0.2%, with the remainder being Mg.

[0010] An arc additively manufactured rare earth magnesium alloy wire comprises, by mass percentage, 13.0-14.0% gadolinium Gd, 5.0-5.5% yttrium Y, 2.0-2.5% zinc Zn, 1.0-1.2% zirconium Zr, ≤0.1% of other single impurity elements, ≤0.2% of other impurity elements in total, and the remainder is Mg.

[0011] The method for preparing a magnesium alloy wire by arc additive manufacturing according to the present invention can be prepared according to the following steps:

[0012] S1 ingredients: select pure magnesium ingots, Mg-Zr master alloys, Mg-Gd master alloys, Mg-Y master alloys, and pure zinc ingots, and mix them according to the required composition ratio;

[0013] S2 alloy smelting: The magnesium alloy raw materials are smelted under argon protection at a smelting temperature of 820-840°C for 8-10 hours. The melt is stirred every 0.5 hours during smelting to keep the melt composition uniform. After smelting is completed, the melt is left to stand;

[0014] S3 Rod casting: When the melt temperature drops to 740°C, the melt is cast into a water-cooled mold to obtain a rod-shaped ingot with a diameter of 180 to 200 mm;

[0015] S4 rod-shaped ingot homogenization treatment: the prepared ingot is uniformly annealed at 400-450°C for 25-35h to obtain a homogenized rod-shaped ingot;

[0016] S5 Forging: Forging the rod-shaped ingot, preheating temperature is 480-500℃, holding time is 10-16h, forging temperature is 480-520℃, and Φ100-120mm rods are obtained;

[0017] S6 extrusion processing: put the rod into the extrusion die, the rod preheating temperature is 500-530℃, the heat preservation time is 12-16h, the extrusion speed is 6-14mm / s, and the Φ4-8mm wire is obtained;

[0018] S7 drawing process: annealing the wire, the annealing temperature is 500-530°C, and the annealing time is 2-4h; the annealed wire is directly fed into the drawing die for drawing, the drawing temperature is 420-450°C, the drawing passes are 50-70 times, annealing is performed after every 10-14 passes, and then the drawing is continued until a Φ1.2-Φ1.6mm wire is obtained;

[0019] S8 peeling process: add the wire to be processed for peeling to remove the surface oxide scale.

[0020] Preferably, the magnesium alloy in S1 is a heavy rare earth magnesium alloy, and its composition, by mass percentage, is: gadolinium Gd: 12.0-14.0%, yttrium Y: 4.2-5.5%, zinc Zn: 1.5-2.5%, zirconium Zr: 0.8-1.2%, and other single impurity elements: ≤0.1%, and the rest of the impurity elements total ≤0.2%, and the balance is Mg.

[0021] Preferably, the alloy melting temperature in S2 is 820-840° C., and the holding time is 8-10 h.

[0022] Preferably, in S4, the ingot is uniformly annealed at 400-450° C. for 25-35 hours.

[0023] Preferably, in S6, the rod preheating temperature is 500-530° C., the holding time is 12-16 h, the extrusion speed is 6-14 mm / s, and a Φ4-8 mm wire is obtained.

[0024] The above preparation method can obtain a high-strength and tough heavy rare earth magnesium alloy wire material, which meets the high-performance manufacturing requirements of aerospace rare earth magnesium alloy components.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention further increases the solid solution strengthening and aging strengthening effects of heavy rare earth elements Gd and Y on the Mg matrix by increasing the content of heavy rare earth elements Gd and Y, improves the coordinated activation ability of the dislocation basal slip system, lateral slip system and main slip system of the rare earth magnesium alloy, improves the deformation ability of the rare earth magnesium alloy, and thus improves the strength and plasticity of the rare earth magnesium alloy. At the same time, the content of Zn and Zr elements is accurately matched to reduce its LPSO phase aggregation ability and refine the grains, coarsen the matrix grains, improve the grain boundary strengthening ability, and further improve its strength and plasticity.

[0027] 2. Considering the further increase of alloy element content, the rare earth magnesium alloy wire preparation process (raw material smelting - casting composition uniformity - extrusion processing - drawing processing) is optimized. The rare earth magnesium alloy wire prepared by the present invention has uniform composition, uniform structure, good surface quality, and meets the requirements of arc additive manufacturing.

[0028] 3. The rare earth magnesium alloy wire prepared by the present invention, after arc additive forming and solution aging, has a component warm tensile strength greater than 365MPa, a yield strength greater than 290MPa, an elongation greater than 10%, and no plastic anisotropy in the transverse and longitudinal directions, meeting the rare earth magnesium alloy arc additive manufacturing requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The high-strength and toughness rare earth magnesium alloy wire prepared by the present application;

[0030] Figure 2 a is a scanning electron microscope image of the structure of the wire sample prepared in Example 1 after arc additive forming. It can be seen that the deposited sample presents coarse equiaxed grains and intracrystalline LPSO phase; Figure 2 b is Figure 2 The scanning electron microscope image of the structure of sample a obtained after solution aging shows that it presents fine equiaxed grains and there is no LPSO phase in the grains. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments disclosed in the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] Example 1

[0033] A method for preparing a rare earth magnesium alloy wire by arc additive manufacturing comprises the following steps:

[0034] S1 ingredients: select pure magnesium ingots, Mg-Zr master alloys, Mg-Gd master alloys, Mg-Y master alloys, and pure zinc ingots, and mix them according to the required composition ratio. The composition by mass percentage is: gadolinium Gd: 12.0%, yttrium Y: 4.5%, zinc Zn: 1.5%, zirconium Zr: 0.8%, and other single impurity elements: ≤0.1%, and the total of other impurity elements is ≤0.2%, and the balance is Mg.

[0035] S2 alloy smelting: The magnesium alloy raw materials are smelted with argon protection at a temperature of 840°C for 10 hours. The melt is stirred every 0.5 hours during smelting to keep the melt composition uniform. After the smelting is completed, the melt is left to stand;

[0036] S3 rod casting: when the melt temperature drops to 740°C, the melt is cast into a water-cooled mold to obtain a Φ180 mm rod-shaped ingot;

[0037] S4 rod-shaped ingot homogenization treatment: the prepared ingot is uniformly annealed at 450°C for 25 hours to obtain a homogenized rod-shaped ingot;

[0038] S5 Forging: Forging the rod-shaped ingot, with a preheating temperature of 480°C, a holding time of 10 hours, and a forging temperature of 480°C to obtain a Φ100mm rod;

[0039] S6 extrusion processing: put the rod into the extrusion die, the rod preheating temperature is 500℃, the heat preservation time is 12h, the extrusion speed is 6mm / s, and Φ8mm wire is obtained;

[0040] S7 drawing process: annealing the wire at a temperature of 500°C for 2 hours; directly feeding the annealed wire into a drawing die for drawing at a temperature of 420°C for 50 passes, wherein annealing is performed after every 10 passes, and then drawing is continued until a Φ1.6 mm wire is obtained;

[0041] S8 peeling process: add the wire to be processed for peeling to remove the surface oxide scale.

[0042] Example 2

[0043] A method for preparing a rare earth magnesium alloy wire by arc additive manufacturing comprises the following steps:

[0044] S1 ingredients: select pure magnesium ingots, Mg-Zr master alloys, Mg-Gd master alloys, Mg-Y master alloys, and pure zinc ingots, and mix them according to the required composition ratio. The composition by mass percentage is: gadolinium Gd: 13.0%, yttrium Y: 5.0%, zinc Zn: 2.0%, zirconium Zr: 1.0%, and other single impurity elements: ≤0.1%, and the total of other impurity elements is ≤0.2%, and the balance is Mg.

[0045] S2 alloy smelting: The magnesium alloy raw materials are smelted with argon protection at a temperature of 820°C for 9 hours. The melt is stirred every 0.5 hours during smelting to keep the melt composition uniform. After the smelting is completed, the melt is left to stand;

[0046] S3 rod casting: when the melt temperature drops to 740°C, the melt is cast into a water-cooled mold to obtain a Φ190 mm rod-shaped ingot;

[0047] S4 rod-shaped ingot homogenization treatment: the prepared ingot is uniformly annealed at 440°C for 28 hours to obtain a homogenized rod-shaped ingot;

[0048] S5 Forging: The rod-shaped ingot is forged with a preheating temperature of 490°C, a holding time of 12h, and a forging temperature of 500°C to obtain a Φ110mm rod;

[0049] S6 extrusion processing: put the rod into the extrusion die, the rod preheating temperature is 520℃, the holding time is 14h, the extrusion speed is 10mm / s, and Φ6mm wire is obtained;

[0050] S7 drawing process: annealing the wire at a temperature of 520°C for 3 hours; directly feeding the annealed wire into a drawing die for drawing at a temperature of 420°C for 60 drawing passes, wherein annealing is performed after every 12 passes, and then drawing is continued until a Φ1.2 mm wire is obtained;

[0051] S8 peeling process: add the wire to be processed for peeling to remove the surface oxide scale.

[0052] Example 3

[0053] A method for preparing a rare earth magnesium alloy wire by arc additive manufacturing comprises the following steps:

[0054] S1 ingredients: select pure magnesium ingots, Mg-Zr master alloys, Mg-Gd master alloys, Mg-Y master alloys, and pure zinc ingots, and mix them according to the required composition ratio. The composition by mass percentage is: gadolinium Gd: 14.0%, yttrium Y: 5.5%, zinc Zn: 2.5%, zirconium Zr: 1.2%, and other single impurity elements: ≤0.1%, and the total of other impurity elements is ≤0.2%, and the balance is Mg.

[0055] S2 alloy smelting: The magnesium alloy raw materials are smelted with argon protection at a temperature of 820°C for 8 hours. The melt is stirred every 0.5 hours during smelting to keep the melt composition uniform. After the smelting is completed, the melt is left to stand;

[0056] S3 rod casting: when the melt temperature drops to 740°C, the melt is cast into a water-cooled mold to obtain a Φ200mm rod-shaped ingot;

[0057] S4 rod-shaped ingot homogenization treatment: the prepared ingot is uniformly annealed at 440°C for 35 hours to obtain a homogenized rod-shaped ingot;

[0058] S5 Forging: The rod-shaped ingot is forged with a preheating temperature of 500°C, a holding time of 16 hours, and a forging temperature of 520°C to obtain a Φ120 mm rod;

[0059] S6 extrusion processing: put the rod into the extrusion die, the rod preheating temperature is 530℃, the holding time is 16h, the extrusion speed is 14mm / s, and Φ4mm wire is obtained;

[0060] S7 drawing process: annealing the wire at a temperature of 530°C for 4 hours; directly feeding the annealed wire into a drawing die for drawing at a temperature of 450°C for 80 drawing passes, wherein annealing is performed after every 12 passes, and then drawing is continued until a Φ1.2 mm wire is obtained;

[0061] S8 peeling process: add the wire to be processed for peeling, remove the surface oxide scale, and obtain the final wire.

[0062] Example 4

[0063] The only difference from Embodiment 1 is that step S2 is different.

[0064] In this embodiment, S2 alloy smelting: the magnesium alloy raw material is configured to be smelted under argon protection at a smelting temperature of 830°C for 10 hours. During the smelting, the melt is stirred every 0.5 hours to keep the melt composition uniform. After the smelting is completed, the melt is allowed to stand.

[0065] Example 5

[0066] In this embodiment, S2 alloy smelting: the magnesium alloy raw material is configured to be smelted under argon protection at a smelting temperature of 835°C for 10 hours. During the smelting, the melt is stirred every 0.5 hours to keep the melt composition uniform. After the smelting is completed, the melt is allowed to stand.

[0067] Example 6

[0068] The only difference from Embodiment 1 is that step S7 is different.

[0069] In this embodiment, the S7 alloy is drawn: the wire is annealed at a temperature of 515°C for 3.5 hours; the annealed wire is directly fed into a drawing die for drawing at a temperature of 435°C.

[0070] Example 7

[0071] The only difference from Embodiment 1 is that step S7 is different.

[0072] In this embodiment, the S7 alloy is drawn: the wire is annealed at a temperature of 525°C for 3.8 hours; the annealed wire is directly fed into a drawing die for drawing at a temperature of 440°C.

[0073] Comparative Example 1

[0074] The alloy element composition in this comparative example is as follows by mass percentage: gadolinium Gd: 10.0%, yttrium Y: 2.5%, zinc Zn: 1.0%, zirconium Zr: 0.5%, the total amount of impurity elements is ≤0.2%, each single impurity element included in the impurity elements is ≤0.1%, and the balance is Mg.

[0075] The rare earth magnesium alloy wire production process is shown in Example 1, and the final Φ1.2 mm wire can be prepared.

[0076] Comparative Example 2

[0077] The alloy element composition in this comparative example is as follows by mass percentage: gadolinium Gd: 14.5%, yttrium Y: 5.6%, zinc Zn: 3.8%, zirconium Zr: 1.5%, the total amount of impurity elements is ≤0.2%, each single impurity element included in the impurity elements is ≤0.1%, and the balance is Mg.

[0078] The rare earth magnesium alloy wire production process is shown in Example 1, and the final Φ1.2 mm wire can be prepared.

[0079] The wires with a diameter of 1.2 mm prepared in the comparative example and the example were used as raw materials, and arc additive manufacturing equipment was used to perform component forming and solid solution aging treatment. Figure 1 Shown is the rare earth magnesium alloy wire prepared in Example 1.

[0080] Figure 2 a is a scanning electron microscope image of the sample structure of the rare earth magnesium alloy wire prepared in Example 1 after arc additive forming. The specific parameters of arc additive forming are as follows: arc additive forming deposition process parameters are: wire elongation 15mm, argon gas flow 40L / min, current 125A, wire feeding rate 7.5m / min, deposition rate 5.5mm / s, layer thickness 2.5mm, overlap rate 62%;

[0081] like Figure 2 As shown in b, Figure 2 The scanning electron microscope image of the sample a after solution aging. Figure 2 The solution aging conditions of sample a are: 525℃ / 2h / water cooling + 175℃ / 170h / air cooling. Figure 2 In b, the sample shows fine equiaxed grains and no LPSO phase in the grains.

[0082] As shown in Table 1, the properties of the formed component are as shown in Table 1, the tensile strength is greater than 365 MPa, the yield strength is greater than 300 MPa, the elongation is greater than 10%, and there is no plastic anisotropy in the transverse and longitudinal directions.

[0083] As shown in Table 1, by using the rare earth magnesium alloy welding wire prepared in the present invention, by adjusting the content of Gd, Y, Zn, and Zr elements, and accurately controlling the subsequent wire processing process of the raw material smelting industry, high-performance magnesium alloy wire that meets the requirements of arc additive manufacturing can be prepared. The rare earth magnesium alloy wire described in the present invention is more suitable for arc additive manufacturing.

[0084] Table 1 Comparison of tensile properties of rare earth magnesium alloy arc additively manufactured components after solution aging

[0085]

[0086] In comparative example 1, when the four main alloying elements (gadolinium Gd, yttrium Y, zinc Zn, zirconium Zr) of the rare earth magnesium alloy wire are lower than the components of claim 1, the arc additive forming process is very easy to form coarse grains (45-65 μm) and coarse intragranular precipitation phase structure (LPSO phase of 0.3-0.6 μm), the grain boundary storage distortion energy is low, and it is impossible to provide sufficient driving force for subsequent special solution aging, and the mechanical properties of the prepared sample are low and there is plastic anisotropy. In comparative example 2, when the four main alloying elements (gadolinium Gd, yttrium Y, zinc Zn, zirconium Zr) of the rare earth magnesium alloy wire are higher than the components of claim 1, the arc additive forming process is very easy to form fine grains (5-15 μm) and grain boundary microsegregation structure, and in the subsequent special heat treatment, the grain boundary microsegregation structure is further caused to gather near the grain boundary, reducing the plasticity of the sample, and even cracking and forming. The rare earth magnesium alloy welding wire prepared by the method provided by the present invention obtains moderate-sized grains (20-35 μm) and fine precipitated phases (LPSO phases of 0.1-0.2 μm) during the arc additive forming process. After subsequent heat treatment, the prepared sample has good mechanical properties and no plastic anisotropy.

[0087] The contents not described in detail in this application specification belong to the common knowledge of those skilled in the art.

[0088] The present application is described in detail above in conjunction with specific implementation methods and exemplary examples, but these descriptions cannot be understood as limiting the present application. Those skilled in the art understand that, without departing from the spirit and scope of the present application, a variety of equivalent replacements, modifications or improvements can be made to the technical solution of the present application and its implementation methods, all of which fall within the scope of the present application. The scope of protection of the present application shall be subject to the attached claims.

Claims

1. An arc additive manufacturing method for complex rare earth magnesium alloy wire, characterized in that: Taking the sum of the mass percentages of the various components as 100%, the invention includes: gadolinium Gd: 12.0-14.0%, yttrium Y: 4.2-5.5%, zinc Zn: 1.5-2.5%, zirconium Zr: 0.8-1.2%, the total amount of impurity elements is ≤0.2%, each single impurity element included in the impurity elements is ≤0.1%, and the balance is Mg.

2. An arc additive manufacturing method for complex rare earth magnesium alloy wire, characterized in that: Taking the sum of the mass percentages of each component as 100%, it includes: gadolinium Gd: 12.0-13.0%, yttrium Y: 4.5-5.0%, zinc Zn: 1.5-2.0%, zirconium Zr: 0.8-1.0%, the total amount of impurity elements is ≤0.2%, each single impurity element included in the impurity elements is ≤0.1%, and the balance is Mg.

3. An arc additive manufacturing method for complex rare earth magnesium alloy wire, characterized in that: Taking the sum of the mass percentages of each component as 100%, it includes: gadolinium Gd: 13.0-14.0%, yttrium Y: 5.0-5.5%, zinc Zn: 2.0-2.5%, zirconium Zr: 1.0-1.2%, the total amount of impurity elements is ≤0.2%, each single impurity element included in the impurity elements is ≤0.1%, and the balance is Mg.

4. A method for preparing complex rare earth magnesium alloy wire by arc additive manufacturing according to any one of claims 1 to 3, characterized in that: include: S1. Mixing: Mixing raw materials according to the content of the complex rare earth magnesium alloy wire manufactured by arc additive manufacturing according to any one of claims 1 to 3 to obtain configured raw materials; S2, alloy smelting: smelting the configured raw materials to obtain a melt; S3, rod casting: when the melt temperature drops to 740°C, the melt is cast into a water-cooled mold to obtain a rod-shaped ingot with a diameter of 180 to 200 mm; S4, annealing the rod-shaped ingot to obtain a homogenized rod-shaped ingot; S5, forging the rod-shaped ingot to obtain a rod; S6, extruding the rod to obtain a wire with a first diameter; S7, annealing the wire of the first diameter to obtain an annealed wire; drawing the annealed wire to obtain a wire of a second diameter; the second diameter is smaller than the first diameter; S8, peeling processing: the wire material obtained in S7 is peeled to remove the surface oxide scale.

5. The preparation method according to claim 4, characterized in that: In the S1, the raw materials are pure magnesium ingot, Mg-Zr master alloy, Mg-Gd master alloy, Mg-Y master alloy and pure zinc ingot.

6. The preparation method according to claim 4, characterized in that: In S2, the raw materials are smelted to obtain a melt, including: The raw materials are melted under argon protection at a temperature of 820-840°C for 8-10 hours. The melt is stirred every 0.5 hours during the melting process to keep the melt composition uniform. After the melting is completed, the melt is allowed to stand.

7. The preparation method according to claim 4, characterized in that: In the above S4, the rod-shaped ingot is subjected to annealing treatment, including: uniformly annealing the rod-shaped ingot at 400-450° C. for a holding time of 25-35 hours.

8. The preparation method according to claim 4, characterized in that: In the S5, the rod-shaped ingot is forged to obtain a rod material, including: forging the rod-shaped ingot, preheating the ingot to 480-500°C, holding time to 10-16h, forging temperature to 480-520°C, to obtain a Φ100-120mm rod material.

9. The preparation method according to claim 4, characterized in that: In the S6, the rod is extruded to obtain a wire, including: placing the rod in an extrusion die, preheating the rod to a temperature of 500 to 530° C., keeping the temperature for 12 to 16 hours, and extruding at a speed of 6 to 14 mm / s to obtain a Φ4 to 8 mm wire.

10. The preparation method according to claim 4, characterized in that: In the step S7, the wire of the first diameter is subjected to annealing treatment, including: an annealing temperature of 500 to 530° C. and an annealing time of 2 to 4 hours; In S7, the annealed wire is subjected to a drawing process, including: a drawing temperature of 420-450° C., 50-70 drawing passes, wherein annealing is performed after every 10-14 passes, and then the drawing is continued until a Φ1.2-Φ1.6 mm wire is obtained.

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