A copper-magnesium alloy wire and a method for producing the same

Abstract

The application relates to the technical field of alloy materials, and discloses a copper-magnesium alloy wire and a preparation method thereof, wherein the copper-magnesium alloy wire contains the following components in percentage by mass: 0.1-0.15% of magnesium, 0.007-0.02% of phosphorus, 0.002-0.03% of rare earth elements, and the balance of copper and inevitable impurities. The copper-magnesium alloy wire can effectively improve the ingot quality and the solid solution strengthening effect of the alloy by adding trace amounts of phosphorus and rare earth elements, and can improve the strength of the copper-magnesium alloy while maintaining high electrical conductivity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of alloy materials, in particular to a copper-magnesium alloy wire and a preparation method thereof. BACKGROUND

[0002] High-voltage wire harness refers to the wire harness connecting the engine, battery and other electrical equipment, wherein the copper-magnesium alloy is widely used as high-speed rail contact wire, new energy vehicle high-voltage wire harness and the like due to its high mechanical strength and good electrical conductivity. However, if the magnesium content in the copper-magnesium alloy is too high, the flowability of the copper alloy will be reduced, thereby reducing the ingot quality, and if the magnesium content is too low, the solid solution strengthening effect of the copper alloy will be affected. Therefore, how to balance the ingot quality and the solid solution strengthening effect of the copper-magnesium alloy is a problem to be solved. SUMMARY

[0003] Therefore, the present application provides a copper-magnesium alloy wire and a preparation method thereof to solve the problem that the existing copper-magnesium alloy cannot effectively balance the ingot quality and the solid solution strengthening effect.

[0004] In order to solve the above technical problems, the present application adopts the following technical solutions:

[0005] On the one hand, the present application provides a copper-magnesium alloy wire, which is composed of copper, magnesium, phosphorus, rare earth elements and inevitable impurities, wherein the content of magnesium is 0.1-0.15% and the content of phosphorus is 0.007-0.02% by mass percentage.

[0006] Preferably, the content of the rare earth elements is 0.002-0.03%.

[0007] Preferably, the rare earth elements include one or more of cerium, lanthanum, praseodymium and neodymium.

[0008] Preferably, the rare earth elements are cerium.

[0009] Preferably, the content of magnesium is 0.12-0.15%.

[0010] Preferably, the content of phosphorus is 0.007-0.01%.

[0011] On the other hand, the present application provides a preparation method of the copper-magnesium alloy wire as described in any one of the above, which comprises the following steps:

[0012] (1) sealing magnesium, copper-phosphorus intermediate alloy and copper-rare earth element intermediate alloy in a copper pipe to obtain a sealed copper pipe;

[0013] (2) melting copper to obtain a copper melt;

[0014] (3) inserting the sealed copper pipe into the copper melt, after the magnesium, copper-phosphorus intermediate alloy and copper-rare earth element intermediate alloy are melted, lifting the sealed copper pipe and removing it, to obtain an alloy melt;

[0015] (4) casting the alloy melt into an ingot, and then sequentially performing hot extrusion, primary drawing, heat treatment and secondary drawing on the ingot to obtain a copper-magnesium alloy wire.

[0016] Preferably, the purity of the magnesium is ≥ 99.9%.

[0017] Preferably, the purity of the copper is ≥ 99.9%.

[0018] Preferably, the mass content of phosphorus in the copper-phosphorus intermediate alloy is 13-15%.

[0019] Preferably, the mass content of rare earth elements in the copper-rare earth element intermediate alloy is 15-25%.

[0020] Preferably, the smelting is performed under a protective atmosphere.

[0021] Preferably, the pressure of the smelting is 0.04-0.06 MPa.

[0022] Preferably, the temperature of the copper melt is maintained at 1150-1300 ℃ in step (3).

[0023] Preferably, the insertion speed is 0.5-1 m / s.

[0024] Preferably, the temperature of the casting is 1150-1300 ℃.

[0025] Preferably, the temperature of the hot extrusion is 500-600 ℃.

[0026] Preferably, the heat treatment is heat preservation at 200-260 ℃ for 2 h, followed by quenching treatment.

[0027] Preferably, the primary drawing and the secondary drawing are both cold deformation drawing, and the drawing speed of the primary drawing and the secondary drawing is independently 2-4 m / min.

[0028] Preferably, the ingot is cylindrical, the diameter of the ingot is 18-22 mm, the diameter of the ingot after the hot extrusion treatment is 8-12 mm, the diameter of the ingot after the primary drawing treatment is 4-8 mm, and the diameter of the copper-magnesium alloy wire after the secondary drawing treatment is 0.1-0.15 mm.

[0029] The present application provides a copper-magnesium alloy wire and a preparation method thereof, which has the following beneficial effects compared with the prior art:

[0030] The present application adds trace amounts of phosphorus and rare earth elements to a copper-magnesium alloy. The rare earth elements can effectively refine the grain of the alloy, optimize the structure of the alloy, and remove impurities in the alloy, thereby improving the quality of the ingot. The phosphorus can effectively improve the solid solution strengthening effect of the alloy, thereby improving the strength and hardness of the copper-magnesium alloy. In addition, by adding phosphorus, the fluidity of the copper alloy during melting and the welding performance of the alloy can be improved simultaneously. DETAILED DESCRIPTION

[0031] The present application will be described in detail below through specific examples. It should be understood by those skilled in the art that the specific examples below are for illustrative purposes only and do not limit the scope of the present application in any way. In addition, in the following examples, unless otherwise specified, the reagents and equipment used are commercially available. If the specific processing conditions and methods are not explicitly described in the following examples, the conditions and methods known in the art can be used for processing.

[0032] In one aspect of the present application, a copper-magnesium alloy wire is provided, which is composed of copper, magnesium, phosphorus, rare earth elements, and unavoidable impurities. The content of magnesium is 0.1-0.15% by mass percentage, and the content of phosphorus is 0.007-0.02% by mass percentage.

[0033] In some embodiments of the present application, the copper-magnesium alloy wire includes magnesium 0.1-0.15% by mass percentage, preferably 0.12-0.15%, for example, it can be 0.1%, 0.11%, 0.12%, 0.13%, 0.14%, 0.15%, etc.; the copper-magnesium alloy wire includes phosphorus 0.007-0.02%, preferably 0.007-0.01%, for example, it can be 0.007%, 0.01%, 0.015%, 0.02%, etc.

[0034] In some embodiments of the present application, the content of the rare earth element is 0.002-0.03%, for example, it can be 0.002%, 0.005%, 0.01%, 0.015%, 0.02%, 0.025%, 0.03%, etc.; the rare earth element includes one or more of cerium, lanthanum, praseodymium, and neodymium, preferably cerium. By adding rare earth elements, the grain of the alloy can be effectively refined, the structure of the alloy can be optimized, and impurities in the alloy can be removed, thereby improving the quality of the ingot.

[0035] It should be noted that the content of magnesium, phosphorus, and rare earth elements in the present application can be within the above defined range, and the combination of different contents is not specially limited and can be adjusted as needed.

[0036] In another aspect of the present application, there is provided a method for preparing the copper-magnesium alloy wire as described in any of the above, comprising the following steps:

[0037] (1) sealing magnesium, copper-phosphorus intermediate alloy and copper-rare earth element intermediate alloy in a copper tube to obtain a sealed copper tube;

[0038] (2) melting copper to obtain a copper melt;

[0039] (3) inserting the sealed copper tube into the copper melt, and after the magnesium, copper-phosphorus intermediate alloy and copper-rare earth element intermediate alloy are melted, lifting the sealed copper tube and removing it to obtain an alloy melt;

[0040] (4) casting the alloy melt into an ingot, and then sequentially performing hot extrusion, primary drawing, heat treatment and secondary drawing on the ingot to obtain a copper-magnesium alloy wire.

[0041] In the present application, magnesium, copper-phosphorus intermediate alloy and copper-rare earth element intermediate alloy are first sealed in a copper tube to obtain a sealed copper tube.

[0042] In some embodiments of the present application, the mass content of phosphorus in the copper-phosphorus intermediate alloy is 13-15%, for example, it can be 13%, 14%, 15% or the like, and the mass content of rare earth elements in the copper-rare earth element intermediate alloy is 15-25%, for example, it can be 15%, 20%, 25% or the like. Since the surfaces of rare earth elements and phosphorus are easily oxidized, and after oxidation, dross may be introduced into the alloy melt, both rare earth elements and phosphorus are added in the form of intermediate alloy, which can effectively avoid the introduction of other impurities, ensure the accuracy and uniformity of alloy composition, and improve the quality of the ingot.

[0043] It should be noted that the copper-phosphorus intermediate alloy and the copper-rare earth element intermediate alloy used in the present application can be purchased from the market, so the mass content of phosphorus in the copper-phosphorus intermediate alloy and the mass content of rare earth elements in the copper-rare earth element intermediate alloy are not specially limited and can be purchased and used according to actual conditions.

[0044] In some embodiments of the present application, magnesium, copper-phosphorus intermediate alloy and copper-rare earth element intermediate alloy are sealed in a copper tube, which can be achieved by the following method: placing magnesium, copper-phosphorus intermediate alloy and copper-rare earth element intermediate alloy in the cavity of the copper tube, and then extruding the edges of the copper tube to be seamless. In this way, the leakage of magnesium, copper-phosphorus intermediate alloy and copper-rare earth element intermediate alloy can be effectively prevented, and the accuracy of the addition amount of each component can be ensured.

[0045] In the present application, copper is melted to obtain a copper melt.

[0046] In some embodiments of the present application, the smelting is performed under a protective atmosphere, for example, argon, nitrogen, etc. The pressure of the smelting is 0.04-0.06 MPa, for example, 0.04 MPa, 0.05 MPa, 0.06 MPa, etc. Since the melting point of copper is 1083℃, the temperature of the smelting of the present application is greater than 1083℃. Under vacuum conditions, the copper liquid is prone to boiling and sputtering. By increasing the pressure in the furnace through aeration, the present application can effectively reduce the boiling and sputtering of the copper liquid.

[0047] In some embodiments of the present application, the smelting is performed in a vacuum medium frequency electromagnetic induction furnace. Before smelting, the medium frequency electromagnetic induction furnace is vacuumed to 30-50 Pa, argon is filled into the cavity of the medium frequency electromagnetic induction furnace, gas washing is performed, and then the medium frequency electromagnetic induction furnace is vacuumed to 10 Pa. Then, argon is filled into the cavity of the medium frequency electromagnetic induction furnace. When the pressure in the cavity is 0.04-0.06 MPa, stop aeration, start heating, and perform smelting. -2 Pa, and then argon is filled into the cavity of the medium frequency electromagnetic induction furnace. When the pressure in the cavity is 0.04-0.06 MPa, stop aeration, start heating, and perform smelting.

[0048] In some embodiments of the present application, the purity of the magnesium is ≥99.9%, and the purity of the copper is ≥99.9%, wherein the copper can be industrial electrolytic copper. By limiting the purity of magnesium and copper, the obtained copper-magnesium alloy wire rod has good mechanical strength and electrical conductivity.

[0049] In the present application, after obtaining the copper melt, the sealed copper pipe is inserted into the copper melt. After the magnesium, copper-phosphorus intermediate alloy, and copper-rare earth element intermediate alloy are melted, the sealed copper pipe is lifted and removed, and the alloy melt is obtained.

[0050] In some embodiments of the present application, the melting process always maintains the temperature of the copper melt at 1150-1300℃, for example, 1150℃, 1200℃, 1250℃, 1300℃, etc. By maintaining the temperature of the copper melt, the magnesium, copper-phosphorus intermediate alloy, and copper-rare earth element intermediate alloy in the sealed copper pipe can be completely melted in the copper melt.

[0051] In some embodiments of the present application, the insertion speed is 0.5-1 m / s, for example, 0.5 m / s, 0.6 m / s, 0.7 m / s, 0.8 m / s, 0.9 m / s, 1 m / s, etc. The sealed copper pipe and the magnesium, copper-phosphorus intermediate alloy, and copper-rare earth element intermediate alloy inside it melt quickly. If the insertion speed is too slow, the magnesium, copper-phosphorus intermediate alloy, and copper-rare earth element intermediate alloy will melt and volatilize above the liquid surface of the copper melt, or react with residual oxygen, etc., resulting in inaccurate amount of addition.

[0052] It should be noted that the magnesium, copper-phosphorus intermediate alloy and copper-rare earth element intermediate alloy are coated in the sealed copper pipe and then inserted into the copper melt, so that the added elements can be better melted in the copper body to avoid ablation and volatilization. In addition, the melting point of the magnesium, copper-phosphorus intermediate alloy and copper-rare earth element intermediate alloy is lower than the melting point of copper. After the sealed copper pipe is inserted into the copper melt, it can be quickly melted. After the magnesium, copper-phosphorus intermediate alloy and copper-rare earth element intermediate alloy are melted, the remaining copper pipe above the liquid surface of the copper melt is lifted to facilitate the subsequent casting process.

[0053] In the present application, after obtaining the alloy melt, the alloy melt is cast into an ingot, and then the ingot is sequentially subjected to hot extrusion, primary drawing, heat treatment and secondary drawing to obtain a copper-magnesium alloy wire.

[0054] In some embodiments of the present application, the casting temperature is 1150-1300℃, for example, it can be 1150℃, 1200℃, 1250℃, 1300℃, etc. Specifically, the alloy melt can be cast into a mold to obtain an ingot. The mold can be made of graphite material. The diameter of the mold can be 18-22mm, for example, it can be 18mm, 20mm, 22mm, etc. It should be noted that the casting temperature affects the quality of the ingot. If the casting temperature is too high, the ingot will produce more and larger shrinkage holes. If the casting temperature is too low, the strength of the ingot will be reduced.

[0055] In some embodiments of the present application, the temperature of the hot extrusion is 500-600℃, for example, it can be 500℃, 520℃, 550℃, 580℃, 600℃, etc. Specifically, the ingot can be heated to 500-600℃, and then the ingot is hot extruded into a round rod. The diameter of the round rod ingot can be 8-12mm, for example, it can be 8mm, 10mm, 12mm, etc. Through hot extrusion, the diameters of the multiple ingots for drawing operation can be unified to ensure the uniform size of the final copper-magnesium alloy wire.

[0056] In some embodiments of the present application, before hot extrusion, it also includes milling. The specific process of milling is not specially limited and can refer to the prior art. Through milling, the defects such as pores, shrinkage holes and dross on the surface of the ingot can be removed to improve the quality of the ingot.

[0057] In some embodiments of the present application, the primary drawing is cold deformation drawing. The drawing speed of the primary drawing is 2-4m / min, for example, it can be 2m / min, 3m / min, 4m / min, etc. Through the primary drawing, the diameter of the round rod ingot can be further reduced, for example, through the primary drawing, the round rod ingot can be reduced to a diameter of 4-8mm, for example, it can be 4mm, 6mm, 8mm, etc.

[0058] In some embodiments of the present application, the heat treatment is holding at 200-260°C for 2 hours, and then quenching. The heat treatment temperature can be, for example, 200°C, 220°C, 240°C, 260°C, etc., and the quenching can be performed by placing the ingot into water as the cooling medium. The quenching process is not particularly limited and can be performed according to the prior art. The heat treatment and quenching can further improve the strength and plasticity of the material.

[0059] In some embodiments of the present application, the secondary drawing is cold deformation drawing, and the drawing speed of the secondary drawing is 2-4 m / min, for example, 2 m / min, 3 m / min, 4 m / min, etc. The diameter of the material after the heat treatment can be further reduced by the secondary drawing, for example, the ingot is reduced to a diameter of 0.1-0.15 mm, i.e., a copper-magnesium alloy wire.

[0060] It should be noted that in the whole drawing operation, the diameter of the ingot is gradually reduced until the final copper-magnesium alloy wire is obtained, which needs to be completed by using different diameter molds. For example, in a specific embodiment of the present application, a round rod-shaped ingot with a diameter of 10 mm is obtained after hot extrusion operation, and the hole diameters of the molds used in the first drawing process are as follows: 10 mm→9.8 mm→9.5 mm→9.2 mm→9.0 mm→8.8 mm→8.2 mm→8 mm→7.8 mm→7.5 mm→7.3 mm→7.0 mm→6.7 mm→6.5 mm→6.3 mm→6 mm, and the round rod-shaped ingot is drawn to 6 mm, then heat treatment and quenching operation are performed; then the second drawing is performed, and the hole diameters of the molds used in the second drawing process are as follows: 5.8 mm→5.6 mm→5.4 mm→5.2 mm→5.0 mm→4.8 mm→4.6 mm→4.4 mm→4.2 mm→4.0 mm→3.8 mm→3.6 mm→3.4 mm→3.2 mm→3.0 mm→2.8 mm→2.6 mm→2.4 mm→2.2 mm→2.0 mm→1.8 mm→1.6 mm→1.4 mm→1.2 mm→1.0 mm→0.9 mm→0.82 mm→0.75 mm→0.7 mm→0.67 mm→0.62 mm→0.6 mm→0.55 mm→0.5 mm→0.46 mm→0.44 mm→0.4 mm→0.38 mm→0.35 mm→0.33 mm→0.3 mm→0.28 mm→0.26 mm→0.24 mm→0.22 mm→0.2 mm→0.18 mm→0.16 mm→0.15 mm. Because the drawing process uses many molds with different hole diameters for continuous drawing, the copper-magnesium alloy wire prepared has good uniformity and stable performance. However, the selection of mold hole diameters is not limited to this, and the use of different hole diameter molds can be increased or decreased according to the size and performance requirements of the copper-magnesium alloy wire.

[0061] The ingot of the present application can effectively improve the strength of the alloy wire through the above hot extrusion, first drawing, heat treatment and quenching, and second drawing processes, and at the same time can make the alloy wire maintain high electrical conductivity.

[0062] The technical solutions in the present application will be described clearly and completely in combination with specific embodiments. The embodiments of the present application are only used as examples, and all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0063] Example 1

[0064] The embodiment provides a copper-magnesium alloy wire rod, which is composed of the following components in percentage by mass: 0.12% of magnesium, 0.007% of phosphorus, 0.002% of rare earth elements, and the balance of copper and inevitable impurities.

[0065] The preparation method of the copper-magnesium alloy wire rod is as follows:

[0066] (1) taking Cu (purity is 99.9%), Mg (purity is 99.9%), Cu-14% P intermediate alloy and Cu-20% Ce intermediate alloy as raw materials, placing the Mg, Cu-14% P intermediate alloy and Cu-20% Ce intermediate alloy in the cavity of a copper pipe, then extruding the edges of the copper pipe to be seamless, and obtaining a sealed copper pipe;

[0067] (2) placing the Cu into a graphite crucible, and adopting a medium-frequency electromagnetic induction furnace to smelt under the protection of argon, wherein, before smelting, the medium-frequency electromagnetic induction furnace is vacuumized to 40 Pa, and argon is filled into the medium-frequency electromagnetic induction furnace to wash the gas, then the medium-frequency electromagnetic induction furnace is vacuumized to 10 Pa again, and then the argon is filled into the cavity of the medium-frequency electromagnetic induction furnace to stop the filling of the argon when the pressure in the cavity is 0.05 MPa, and the heating is started to smelt, and after the Cu is completely melted, the copper melt is obtained; -2

[0068] (3) keeping the temperature of the copper melt at 1200 DEG C, inserting the sealed copper pipe into the copper melt at a speed of 0.5 m / s, after the sealed copper pipe and the magnesium, Cu-14% P intermediate alloy and Cu-20% Ce intermediate alloy coated by the sealed copper pipe are completely melted, the copper pipe above the liquid surface of the copper melt is lifted and removed, and the alloy melt is obtained;

[0069] (4) at the temperature of 1200 DEG C, the alloy melt is cast into a graphite mold with a diameter of 20 mm, and a cast ingot is obtained, and the cast ingot is subjected to face milling treatment to mill off defects such as pores, shrinkage holes and dross on the surface of the cast ingot;

[0070] (5) the cast ingot subjected to the face milling treatment is heated to 550 DEG C, and is hot extruded to 10 mm, and a round rod-shaped cast ingot is obtained;

[0071] (6) the round rod-shaped cast ingot is subjected to cold deformation drawing to a diameter of 6 mm, and the drawing rate is 4 m / min, and the drawing process is completed by means of molds with different hole diameters, and the hole diameters of the molds used are as follows: 10 mm→9.8 mm→9.5 mm→9.2 mm→9.0 mm→8.8 mm→8.2 mm→8 mm→7.8 mm→7.5 mm→7.3 mm→7.0 mm→6.7 mm→6.5 mm→6.3 mm→6 mm;

[0072] ​(7) The round bar ingot with a diameter of 6 mm is put into a heat treatment furnace, and is kept at 240 °C for 2 h, and then is taken out from the heat treatment furnace and is quickly put into water to cool to perform quenching treatment;

[0073] (8) The round bar ingot after the heat treatment and quenching treatment is cold deformed and drawn to a diameter of 0.15 mm at a drawing speed of 4 m / min to obtain a copper-magnesium alloy wire; the drawing process is completed by means of a die with different hole diameters, and the hole diameters of the die used are in turn: 5.8 mm→5.6 mm→5.4 mm→5.2 mm→5.0 mm→4.8 mm→4.6 mm→4.4 mm→4.2 mm→4.0 mm→3.8 mm→3.6 mm→3.4 mm→3.2 mm→3.0 mm→2.8 mm→2.6 mm→2.4 mm→2.2 mm→2.0 mm→1.8 mm→1.6 mm→1.4 mm→1.2 mm→1.0 mm→0.9 mm→0.82 mm→0.75 mm→0.7 mm→0.67 mm→0.62 mm→0.6 mm→0.55 mm→0.5 mm→0.46 mm→0.44 mm→0.4 mm→0.38 mm→0.35 mm→0.33 mm→0.3 mm→0.28 mm→0.26 mm→0.24 mm→0.22 mm→0.2 mm→0.18 mm→0.16 mm→0.15 mm.

[0074] Examples 2-4

[0075] Examples 2-4 are basically the same as Example 1, and the only difference is that the component composition of the copper-magnesium alloy wire is different.

[0076] Comparative Example 1

[0077] This comparative example is basically the same as Example 1, and the only difference is that the component composition of the copper-magnesium alloy wire is different.

[0078] Comparative Example 2

[0079] This comparative example is basically the same as Example 1, and the only difference is that the component composition of the copper-magnesium alloy wire is different, and the drawing speed of step (6) and step (8) is independently 10 m / min.

[0080] The component composition of the copper-magnesium alloy wire of Examples 2-4 and Comparative Example 1 is shown in Table 1.

[0081] Table 1

[0082]

[0083]

[0084] The tensile strength and electrical conductivity of the copper-magnesium alloy wire prepared in Examples 1-4 and Comparative Examples 1-2 were tested, and the results are shown in Table 2. The tensile strength was tested according to GB / T 4909.3-2009 Bare Wire Test Methods Part 3: Tensile Test; the electrical conductivity was tested according to GB / T 3048.2-2007 Wire and Cable Electrical Property Test Methods Part 2: Resistance Rate Test of Metallic Materials; and the hardness was tested according to the following parameters: test load 1.961 N (200 gf), and load holding time 15 s.

[0085] Table 2

[0086] Tensile strength (MPa) Electrical conductivity (% IACS) Hardness (HV) Example 1 813 80.2 225 Example 2 808 81.4 218 Example 3 793 80.7 214 Example 4 836 74.3 236 Comparative Example 1 774 84.7 201 Comparative Example 2 758 85.1 194

[0087] As can be seen from Table 2, the copper-magnesium alloy wire of the present application can effectively improve the tensile strength while maintaining a high electrical conductivity. In Example 3, the addition of phosphorus forms precipitates, which reduces the tensile strength of the copper-magnesium alloy wire. In Example 4, the addition of magnesium reduces the electrical conductivity of the copper-magnesium alloy wire, but also increases the tensile strength of the copper-magnesium alloy wire.

[0088] In addition, as can be seen from Comparative Example 1-2, if the drawing speed is increased, the electrical conductivity of the copper-magnesium alloy wire is slightly increased, but the strength and hardness are significantly reduced. Therefore, the drawing speed is preferably limited to 2-4 m / min.

[0089] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present application.

Claims

1. A copper-magnesium alloy wire, characterized by, The copper-magnesium alloy wire is composed of copper, magnesium, phosphorus, rare earth elements and inevitable impurities, and the content of magnesium is 0.1-0.15% by mass percentage, the content of phosphorus is 0.007-0.01% by mass percentage, and the content of rare earth elements is 0.002-0.005% by mass percentage. The preparation method of the copper-magnesium alloy wire comprises the following steps: (1) sealing magnesium, copper-phosphorus intermediate alloy and copper-rare earth element intermediate alloy in a copper pipe to obtain a sealed copper pipe; (2) melting copper to obtain a copper melt; (3) inserting the sealed copper pipe into the copper melt, and after the magnesium, copper-phosphorus intermediate alloy and copper-rare earth element intermediate alloy are melted, lifting the sealed copper pipe and removing it to obtain an alloy melt; (4) casting the alloy melt into an ingot, and then sequentially performing hot extrusion, primary drawing, heat treatment and secondary drawing on the ingot to obtain a copper-magnesium alloy wire; The drawing speed of the primary drawing and the secondary drawing is independently 2-4 m / min.

2. The copper-magnesium alloy wire of claim 1, wherein The rare earth elements include one or more of cerium, lanthanum, praseodymium and neodymium.

3. The copper-magnesium alloy wire of claim 2, wherein The rare earth elements are cerium.

4. The copper-magnesium alloy wire of claim 1, wherein The content of magnesium is 0.12-0.15%.

5. A method of producing the copper-magnesium alloy wire as claimed in any one of claims 1 to 4, characterized by, The preparation method of the copper-magnesium alloy wire comprises the following steps: (1) sealing magnesium, copper-phosphorus intermediate alloy and copper-rare earth element intermediate alloy in a copper pipe to obtain a sealed copper pipe; (2) melting copper to obtain a copper melt; (3) inserting the sealed copper pipe into the copper melt, and after the magnesium, copper-phosphorus intermediate alloy and copper-rare earth element intermediate alloy are melted, lifting the sealed copper pipe and removing it to obtain an alloy melt; (4) casting the alloy melt into an ingot, and then sequentially performing hot extrusion, primary drawing, heat treatment and secondary drawing on the ingot to obtain a copper-magnesium alloy wire; The drawing speed of the primary drawing and the secondary drawing is independently 2-4 m / min.

6. The method of producing a copper-magnesium alloy wire according to claim 5, characterized by, The mass content of phosphorus in the copper-phosphorus intermediate alloy is 13-15%; The mass content of rare earth elements in the copper-rare earth element intermediate alloy is 15-25%.

7. The method of producing a copper-magnesium alloy wire according to claim 5, characterized by, The melting is performed under a protective atmosphere; The pressure of the melting is 0.04-0.06 MPa.

8. The method of producing a copper-magnesium alloy wire according to claim 5, characterized by, The temperature of the copper melt is maintained at 1150-1300°C in step (3).

9. The method of producing a copper-magnesium alloy wire according to claim 5, characterized by, The inserting speed is 0.5-1 m / s.

10. The method of producing a copper-magnesium alloy wire according to claim 5, characterized by, The temperature of the casting is 1150-1300°C.

11. The method of producing a copper-magnesium alloy wire according to claim 5, characterized by, The temperature of the hot extrusion is 500-600°C; The heat treatment is heat preservation at 200-260°C for 2 h, and then quenching treatment; Both the primary drawing and the secondary drawing are cold deformation drawing.

12. The method of producing a copper-magnesium alloy wire according to any one of claims 5 to 11, characterized by, The ingot is cylindrical, the diameter of the ingot is 18-22 mm, the diameter of the ingot after the hot extrusion is 8-12 mm, the diameter of the ingot after the primary drawing is 4-8 mm, and the diameter of the copper-magnesium alloy wire after the secondary drawing is 0.1-0.15 mm.

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