Copper-magnesium-yttrium alloy wire and preparation method thereof

Abstract

The invention discloses a copper-magnesium-yttrium alloy wire and a preparation method thereof, and belongs to the technical field of alloys, and the copper-magnesium-yttrium alloy wire comprises the following components in percentage by weight: 0.6-0.8% of magnesium, 0.05-0.1% of yttrium and the balance of copper and inevitable impurities. Cathode copper, a copper-yttrium alloy and a copper-magnesium alloy are smelted into an alloy melt, then the alloy melt is dragged, a copper-magnesium alloy wire is synchronously and continuously fed during dragging, volatile magnesium elements are effectively supplemented, the component stability of the copper-magnesium alloy in the casting process is effectively improved, meanwhile, uniform distribution of the magnesium elements in the alloy wire is promoted, and the yield of the copper-magnesium alloy is improved. And formation of a stable intermetallic compound with the yttrium element is promoted, the conductivity, the wear resistance and the mechanical property of the copper-magnesium-yttrium alloy wire are effectively improved, and the copper-magnesium-yttrium alloy wire has a wide application prospect.

Description

Technical Field

[0001] The invention relates to the technical field of alloys, and in particular to a copper-magnesium-yttrium alloy wire and a preparation method thereof. Background Art

[0002] Due to its superior processing performance and physical properties, copper-magnesium alloys are widely used in railway systems such as railway contact wires and catenary cables, as well as in electronic information fields such as automotive wiring harnesses, medical devices, and robots. However, magnesium is very active and is easily volatilized and oxidized during the copper-magnesium alloy casting process, which leads to unstable distribution of magnesium in the copper-magnesium alloy and affects its performance. Therefore, how to achieve uniform addition of magnesium in copper alloys is a key issue restricting the preparation of large quantities of high-quality copper-magnesium alloy wires.

[0003] In addition, copper-magnesium alloy wires need to withstand complex loads such as vibration, impact, bending, tension and compression during service, and often face the problem of fracture failure. Wear is one of the important factors that induce the failure of copper-magnesium alloy wires. Therefore, how to improve the wear resistance of copper-magnesium alloys without losing mechanical and conductive properties is an urgent problem to be solved in order to achieve widespread application of copper-magnesium alloys.

[0004] In view of this, this application is filed. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a copper-magnesium-yttrium alloy having excellent mechanical properties, electrical conductivity and wear resistance, wherein the copper-magnesium-yttrium alloy has a tensile strength of 60-700 MPa, a conductivity of 85-90% IACS, and a wear rate of less than 8×10 -3 mg / m (P=20N, V=0.418m / s).

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A copper-magnesium-yttrium alloy wire contains the following components in percentage by weight: 0.6-0.8% magnesium, 0.05-0.1% yttrium, and the balance is copper and inevitable impurities.

[0008] The present invention also provides a method for preparing a copper-magnesium-yttrium alloy wire, comprising the following steps:

[0009] (1) Weigh cathode copper, copper-magnesium alloy and copper-yttrium alloy respectively according to the element composition of copper-magnesium-yttrium alloy wire;

[0010] (2) melting cathode copper, copper-yttrium alloy, and copper-magnesium alloy into an alloy melt;

[0011] (3) keeping the alloy melt warm, and pulling the alloy melt through a horizontal continuous casting device to obtain an alloy cast rod;

[0012] During the traction process, the copper-magnesium alloy wire is fed continuously;

[0013] (4) continuously extruding the alloy cast rod to obtain an extruded alloy rod;

[0014] (5) drawing the extruded alloy rod to a desired size to obtain a wire;

[0015] (6) The wire is placed in liquid nitrogen to keep warm, and then taken out to obtain a copper-magnesium-yttrium alloy wire.

[0016] The present invention creatively melts cathode copper, copper-yttrium alloy and copper-magnesium alloy into alloy melt, and then pulls the alloy melt, while simultaneously continuously feeding the copper-magnesium alloy wire, effectively replenishing the volatilized magnesium element, effectively improving the composition stability of the copper-magnesium alloy during the melting and casting process, and at the same time promoting the uniform distribution of the magnesium element in the alloy wire, promoting the formation of a stable intermetallic compound with the yttrium element, and promoting the formation of a uniformly distributed dispersion strengthening phase through liquid nitrogen deep cryogenic treatment, effectively improving the electrical conductivity, wear resistance and mechanical properties of the copper-magnesium-yttrium alloy wire, and having broad application prospects.

[0017] As a preferred embodiment of the present invention, the mass percentage of magnesium in the copper-magnesium alloy is 5-95%.

[0018] As a preferred embodiment of the present invention, the mass percentage of yttrium in the copper-yttrium alloy is 10-60%.

[0019] As a preferred embodiment of the present invention, step (2) is specifically: smelting cathode copper at 1200-1300°C for 30-120min to obtain copper liquid, adding copper-yttrium alloy to the copper liquid, keeping it at 1200-1300°C for 20-40min, cooling it to 1100-1200°C, adding copper-magnesium alloy and keeping it at this temperature for 5-20min to obtain an alloy melt.

[0020] As a preferred embodiment of the present invention, the insulation temperature in step (3) is 1150-1200°C.

[0021] As a preferred embodiment of the present invention, the insulation time in step (5) is 24 to 48 hours.

[0022] As a preferred embodiment of the present invention, the pulling rate is 4-6 mm / s.

[0023] As a preferred embodiment of the present invention, the mass percentage of magnesium in the copper-magnesium alloy wire is 2-6%.

[0024] As a preferred embodiment of the present invention, the feeding rate of the copper-magnesium alloy wire is v=(a*t) mm / s, a is a rate constant, a is 0.0002-0.001, and t is the pulling time, the unit is s.

[0025] As a preferred embodiment of the present invention, the extrusion ratio is 1.5-4, and the extrusion rate is 5-8 rpm.

[0026] As a preferred embodiment of the present invention, the single-pass drawing deformation rate is 20-30%.

[0027] As a preferred embodiment of the present invention, the diameter of the alloy casting rod is 20 to 40 mm.

[0028] As a preferred embodiment of the present invention, the diameter of the extruded alloy rod is 8 to 16 mm.

[0029] As a preferred embodiment of the present invention, the diameter of the copper-magnesium alloy wire is 1 to 3 mm.

[0030] The beneficial effects of the present invention are as follows: the present invention melts cathode copper, copper-yttrium alloy, and copper-magnesium alloy into an alloy melt, and then pulls the alloy melt, while simultaneously and continuously feeding the copper-magnesium alloy wire, effectively replenishing the volatilized magnesium element, effectively improving the composition stability of the copper-magnesium alloy during the melting and casting process, and at the same time promoting the uniform distribution of the magnesium element in the alloy wire, promoting the formation of a stable intermetallic compound with the yttrium element, and effectively improving the electrical conductivity, wear resistance and mechanical properties of the copper-magnesium-yttrium alloy wire, and having broad application prospects. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0032] In the present application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0033] In this application, when it comes to numerical ranges, unless otherwise specified, the above numerical ranges are deemed to be continuous and include the minimum and maximum values ​​of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0034] In the present application, there is no particular limitation on the specific dispersion and stirring treatment methods.

[0035] Unless otherwise specified, the components, raw materials or instruments used in the embodiments and comparative examples of the present invention are all commercially available raw materials or instruments, and the components and raw materials used in each parallel experiment are all of the same kind.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] Example 1

[0038] A method for preparing a copper-magnesium-yttrium alloy wire comprises the following steps:

[0039] (1) According to the element composition of copper-magnesium-yttrium alloy wire: 0.6wt% magnesium, 0.05wt% yttrium, and the balance copper, cathode copper, copper-magnesium alloy, and copper-yttrium alloy are weighed respectively;

[0040] Wherein, the mass percentage of magnesium in the copper-magnesium alloy is 10%; the mass percentage of yttrium in the copper-yttrium alloy is 20%;

[0041] (2) Placing cathode copper in a vacuum melting furnace, evacuating the furnace, maintaining the vacuum degree in the furnace below 0.1 MPa, smelting at 1300° C. for 60 min to obtain molten copper, adding copper-yttrium alloy to the molten copper, keeping the temperature at 1300° C. for 30 min, cooling to 1150° C., adding copper-magnesium alloy and keeping the temperature for 10 min to obtain an alloy melt.

[0042] (3) pouring the alloy melt into a holding furnace for holding at a temperature of 1200° C., and then pulling it through a horizontal continuous casting device at a pulling rate of 4 mm / s to obtain a copper-magnesium-yttrium alloy casting rod with a diameter of 20 mm;

[0043] During the traction process, a continuous wire feeding device is used to continuously add copper-magnesium intermediate alloy wire with a diameter of 1.0 mm and a magnesium content of 2 wt% at the pouring channel. The continuous wire feeding rate is linearly increased according to the formula v=0.0002*t mm / s, where t is the traction time in seconds;

[0044] (4) continuously extruding the alloy cast rod at an extrusion ratio of 1.56 and an extrusion rate of 6 r / min to obtain an extruded alloy rod with a diameter of 16 mm;

[0045] (5) the extruded alloy rod is subjected to multiple drawing passes, with a single drawing deformation rate of 25%, to obtain a wire with a diameter of 5.23 mm;

[0046] (6) The wire is placed in liquid nitrogen and kept warm for 48 hours, and then taken out to obtain a copper-magnesium-yttrium alloy wire.

[0047] The element composition of the prepared copper-magnesium-yttrium alloy wire is maintained as follows: 0.6wt% of magnesium, 0.05wt% of yttrium, the balance of copper and less than 0.01wt% of impurities.

[0048] Example 2

[0049] A method for preparing a copper-magnesium-yttrium alloy wire comprises the following steps:

[0050] (1) According to the element composition of copper-magnesium-yttrium alloy wire: 0.7wt% magnesium, 0.075wt% yttrium, and the balance copper, cathode copper, copper-magnesium alloy, and copper-yttrium alloy are weighed respectively;

[0051] Wherein, the mass percentage of magnesium in the copper-magnesium alloy is 10%; the mass percentage of yttrium in the copper-yttrium alloy is 20%;

[0052] (2) Placing cathode copper in a vacuum melting furnace, evacuating the furnace, maintaining the vacuum degree in the furnace below 0.1 MPa, smelting at 1300° C. for 60 min to obtain molten copper, adding copper-yttrium alloy to the molten copper, keeping the temperature at 1300° C. for 30 min, cooling to 1150° C., adding copper-magnesium alloy and keeping the temperature for 10 min to obtain an alloy melt.

[0053] (3) pouring the alloy melt into a holding furnace for holding at a temperature of 1200° C., and then pulling it through a horizontal continuous casting device at a pulling rate of 4 mm / s to obtain a copper-magnesium-yttrium alloy casting rod with a diameter of 20 mm;

[0054] During the traction process, a continuous wire feeding device is used to continuously add copper-magnesium intermediate alloy wire with a diameter of 1.0 mm and a magnesium content of 2 wt% at the pouring channel. The continuous wire feeding rate is linearly increased according to the formula v=0.0002*t mm / s, where t is the traction time in seconds;

[0055] (4) continuously extruding the alloy cast rod at an extrusion ratio of 1.56 and an extrusion rate of 6 r / min to obtain an extruded alloy rod with a diameter of 16 mm;

[0056] (5) the extruded alloy rod is subjected to multiple drawing passes, with a single drawing deformation rate of 25%, to obtain a wire with a diameter of 5.23 mm;

[0057] (6) The wire is placed in liquid nitrogen and kept warm for 48 hours, and then taken out to obtain a copper-magnesium-yttrium alloy wire.

[0058] The element composition of the prepared copper-magnesium-yttrium alloy wire is maintained as follows: 0.7wt% magnesium, 0.075wt% yttrium, the balance copper and less than 0.01wt% impurities.

[0059] Example 3

[0060] A method for preparing a copper-magnesium-yttrium alloy wire comprises the following steps:

[0061] (1) According to the element composition of copper-magnesium-yttrium alloy wire: 0.8wt% magnesium, 0.1wt% yttrium, and the balance copper, cathode copper, copper-magnesium alloy, and copper-yttrium alloy are weighed respectively;

[0062] Wherein, the mass percentage of magnesium in the copper-magnesium alloy is 10%; the mass percentage of yttrium in the copper-yttrium alloy is 20%;

[0063] (2) Placing cathode copper in a vacuum melting furnace, evacuating the furnace, maintaining the vacuum degree in the furnace below 0.1 MPa, smelting at 1300° C. for 60 min to obtain molten copper, adding copper-yttrium alloy to the molten copper, keeping the temperature at 1300° C. for 30 min, cooling to 1150° C., adding copper-magnesium alloy and keeping the temperature for 10 min to obtain an alloy melt.

[0064] (3) pouring the alloy melt into a holding furnace for holding at a temperature of 1200° C., and then pulling it through a horizontal continuous casting device at a pulling rate of 4 mm / s to obtain a copper-magnesium-yttrium alloy casting rod with a diameter of 20 mm;

[0065] During the traction process, a continuous wire feeding device is used to continuously add copper-magnesium intermediate alloy wire with a diameter of 1.0 mm and a magnesium content of 2 wt% at the pouring channel. The continuous wire feeding rate is linearly increased according to the formula v=0.001*t mm / s, where t is the traction time in seconds;

[0066] (4) continuously extruding the alloy cast rod at an extrusion ratio of 1.56 and an extrusion rate of 6 r / min to obtain an extruded alloy rod with a diameter of 16 mm;

[0067] (5) the extruded alloy rod is subjected to multiple drawing passes, with a single drawing deformation rate of 25%, to obtain a wire with a diameter of 5.23 mm;

[0068] (6) The wire is placed in liquid nitrogen and kept warm for 48 hours, and then taken out to obtain a copper-magnesium-yttrium alloy wire.

[0069] The element composition of the prepared copper-magnesium-yttrium alloy wire is maintained as follows: 0.8 wt % of magnesium, 0.1 wt % of yttrium, the balance of copper and less than 0.01 wt % of impurities.

[0070] Comparative Example 1

[0071] A method for preparing a copper-magnesium alloy wire comprises the following steps:

[0072] (1) According to the elemental composition of the copper-magnesium alloy wire: 0.6 wt% magnesium and the balance copper, cathode copper and copper-magnesium alloy were weighed respectively;

[0073] Wherein, the mass percentage of magnesium in the copper-magnesium alloy is 10%;

[0074] (2) Placing the cathode copper in a vacuum melting furnace, evacuating the furnace, maintaining the vacuum degree in the furnace below 0.1 MPa, smelting at 1300° C. for 60 min to obtain molten copper, cooling the temperature to 1150° C., adding copper-magnesium alloy and keeping the temperature for 10 min to obtain an alloy melt.

[0075] (3) pouring the alloy melt into a holding furnace for holding at a temperature of 1200° C., and then pulling it through a horizontal continuous casting device at a pulling rate of 4 mm / s to obtain a copper-magnesium-yttrium alloy casting rod with a diameter of 20 mm;

[0076] During the traction process, a continuous wire feeding device is used to continuously add copper-magnesium intermediate alloy wire with a diameter of 1.0 mm and a magnesium content of 2 wt% at the pouring channel. The continuous wire feeding rate is linearly increased according to the formula v=0.0002*t mm / s, where t is the traction time in seconds;

[0077] (4) continuously extruding the alloy cast rod at an extrusion ratio of 1.56 and an extrusion rate of 6 r / min to obtain an extruded alloy rod with a diameter of 16 mm;

[0078] (5) the extruded alloy rod is subjected to multiple drawing passes, with a single drawing deformation rate of 25%, to obtain a wire with a diameter of 5.23 mm;

[0079] (6) The wire is placed in liquid nitrogen and kept warm for 48 hours, and then taken out to obtain a copper-magnesium alloy wire.

[0080] Comparative Example 2

[0081] A method for preparing a copper-magnesium-yttrium alloy wire comprises the following steps:

[0082] (1) According to the element composition of copper-magnesium-yttrium alloy wire: 0.6wt% magnesium, 0.05wt% yttrium, and the balance copper, cathode copper, copper-magnesium alloy, and copper-yttrium alloy are weighed respectively;

[0083] Wherein, the mass percentage of magnesium in the copper-magnesium alloy is 10%; the mass percentage of yttrium in the copper-yttrium alloy is 20%;

[0084] (2) Placing cathode copper in a vacuum melting furnace, evacuating the furnace, maintaining the vacuum degree in the furnace below 0.1 MPa, smelting at 1300° C. for 60 min to obtain molten copper, adding copper-yttrium alloy to the molten copper, keeping the temperature at 1300° C. for 30 min, cooling to 1150° C., adding copper-magnesium alloy and keeping the temperature for 10 min to obtain an alloy melt.

[0085] (3) pouring the alloy melt into a holding furnace for holding at a temperature of 1200° C., and then pulling it through a horizontal continuous casting device at a pulling rate of 4 mm / s to obtain a copper-magnesium-yttrium alloy casting rod with a diameter of 20 mm;

[0086] During the traction process, a continuous wire feeding device is used to continuously add copper-magnesium intermediate alloy wire with a diameter of 1.0 mm and a magnesium content of 2 wt% at the pouring channel. The continuous wire feeding rate is linearly increased according to the formula v=0.0002*t mm / s, where t is the traction time in seconds;

[0087] (4) continuously extruding the alloy cast rod at an extrusion ratio of 1.56 and an extrusion rate of 6 r / min to obtain an extruded alloy rod with a diameter of 16 mm;

[0088] (5) The extruded alloy rod is subjected to multiple drawing passes, with a single drawing deformation rate of 25%, to obtain a copper-magnesium-yttrium alloy wire with a diameter of 5.23 mm.

[0089] Comparative Example 3

[0090] A method for preparing a copper-magnesium-yttrium alloy wire comprises the following steps:

[0091] (1) According to the element composition of copper-magnesium-yttrium alloy wire: 0.6wt% magnesium, 0.05wt% yttrium, and the balance copper, cathode copper, copper-magnesium alloy, and copper-yttrium alloy are weighed respectively;

[0092] Wherein, the mass percentage of magnesium in the copper-magnesium alloy is 10%; the mass percentage of yttrium in the copper-yttrium alloy is 20%;

[0093] (2) Placing cathode copper in a vacuum melting furnace, evacuating the furnace, maintaining the vacuum degree in the furnace below 0.1 MPa, smelting at 1300° C. for 60 min to obtain molten copper, adding copper-yttrium alloy to the molten copper, keeping the temperature at 1300° C. for 30 min, cooling to 1150° C., adding copper-magnesium alloy and keeping the temperature for 10 min to obtain an alloy melt.

[0094] (3) pouring the alloy melt into a holding furnace for holding at a temperature of 1200° C., and then pulling it through a horizontal continuous casting device at a pulling rate of 4 mm / s to obtain a copper-magnesium-yttrium alloy casting rod with a diameter of 20 mm;

[0095] (4) continuously extruding the alloy cast rod at an extrusion ratio of 1.56 and an extrusion rate of 6 r / min to obtain an extruded alloy rod with a diameter of 16 mm;

[0096] (5) the extruded alloy rod is subjected to multiple drawing passes, with a single drawing deformation rate of 25%, to obtain a wire with a diameter of 5.23 mm;

[0097] (6) The wire is placed in liquid nitrogen and kept warm for 48 hours, and then taken out to obtain a copper-magnesium-yttrium alloy wire.

[0098] Comparative Example 4

[0099] The difference between Comparative Example 4 and Example 1 is that the feeding rate of the copper-magnesium alloy wire in Comparative Example 4 is different.

[0100] The feeding rate of this comparative example is v=0.0001*t mm / s, which increases linearly, wherein t is the traction time in seconds.

[0101] Comparative Example 5

[0102] The difference between Comparative Example 5 and Example 1 is that the feeding rate of the copper-magnesium alloy wire in Comparative Example 5 is different.

[0103] The feeding rate of this comparative example is v=0.003*t mm / s, which increases linearly, wherein t is the traction time in seconds.

[0104] Test Case

[0105] The properties of the copper-magnesium-yttrium alloy wires prepared in the examples and comparative examples are shown in Table 1.

[0106] Mechanical properties: The mechanical properties of the wire are tested by tensile test. The tensile test is carried out in accordance with the provisions of GB / T34505-2017, and the sample number is R7 in the table of GB / T34505-2017.

[0107] Conductivity: The electrical performance test of the wire shall be carried out in accordance with the provisions of GB / T 351.

[0108] Wear rate: GB / T 3960-2016 “Test methods for sliding friction and wear of plastics”, using M2000 ring block friction and wear testing machine, friction and wear tests were carried out under the conditions of pressure of 20N and speed of 0.418m / s.

[0109] Table 1

[0110]

[0111]

[0112] It can be seen from Table 1 that the copper-magnesium-yttrium alloy wire of the present invention has excellent mechanical properties, electrical conductivity and wear resistance. The copper-magnesium-yttrium alloy has a tensile strength of 600-700 MPa, a conductivity of 85-91% IACS, and a wear rate of less than 8×10 -3 mg / m (P=20N, V=0.418m / s), good uniformity, basically no difference between the head end and the tail end, the magnesium element is evenly distributed in the alloy wire, promoting the formation of stable intermetallic compounds with the yttrium element.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A copper-magnesium-yttrium alloy wire, characterized in that: The invention contains the following components in weight percentage: 0.6-0.8% magnesium, 0.05-0.1% yttrium, and the balance is copper and inevitable impurities.

2. The method for preparing copper-magnesium-yttrium alloy wire according to claim 1, characterized in that: The following steps are involved: (1) Weigh cathode copper, copper-magnesium alloy and copper-yttrium alloy respectively according to the element composition of copper-magnesium-yttrium alloy wire; (2) melting cathode copper, copper-yttrium alloy, and copper-magnesium alloy into an alloy melt; (3) keeping the alloy melt warm, and pulling the alloy melt through a horizontal continuous casting device to obtain an alloy cast rod; During the traction process, the copper-magnesium alloy wire is fed continuously; (4) continuously extruding the alloy cast rod to obtain an extruded alloy rod; (5) drawing the extruded alloy rod to a desired size to obtain a wire; (6) The wire is placed in liquid nitrogen to keep warm, and then taken out to obtain a copper-magnesium-yttrium alloy wire.

3. The method for preparing the copper-magnesium-yttrium alloy wire according to claim 2, characterized in that: The mass percentage of magnesium in the copper-magnesium alloy is 5 to 95%; and / or The mass percentage of yttrium in the copper-yttrium alloy is 10-60%.

4. The method for preparing the copper-magnesium-yttrium alloy wire according to claim 2, characterized in that: Step (2) is specifically as follows: smelting cathode copper at 1200-1300° C. for 30-120 min to obtain molten copper, adding copper-yttrium alloy to the molten copper, keeping it at 1200-1300° C. for 20-40 min, cooling it to 1100-1200° C., adding copper-magnesium alloy and keeping it at this temperature for 5-20 min to obtain an alloy melt.

5. The method for preparing the copper-magnesium-yttrium alloy wire according to claim 2, characterized in that: The temperature of the insulation in step (3) is 1150-1200° C.; and / or The insulation time in step (5) is 24 to 48 hours.

6. The method for preparing copper-magnesium-yttrium alloy wire according to claim 2, characterized in that: The pulling rate is 4-6 mm / s.

7. The method for preparing copper-magnesium-yttrium alloy wire according to claim 2, characterized in that: The mass percentage of magnesium in the copper-magnesium alloy wire is 2-6%; and / or The feeding rate of the copper-magnesium alloy wire is v=(a*t) mm / s, a is a rate constant, a is 0.0002-0.001, and t is the pulling time, the unit is s.

8. The method for preparing copper-magnesium-yttrium alloy wire according to claim 2, characterized in that: The extrusion ratio is 1.5-4, and the extrusion rate is 5-8 rpm.

9. The method for preparing copper-magnesium-yttrium alloy wire according to claim 2, characterized in that: The single-pass drawing deformation rate is 20-30%.

10. The method for preparing copper-magnesium-yttrium alloy wire according to claim 2, characterized in that: The diameter of the alloy casting rod is 20 to 40 mm; and / or The diameter of the extruded alloy rod is 8 to 16 mm; and / or The diameter of the copper-magnesium alloy wire is 1 to 3 mm.

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