Copper transition magnesium / titanium bimetallic material and preparation method thereof

Abstract

The invention relates to the field of magnesium / titanium bimetallic materials, in particular to a copper transition magnesium / titanium bimetallic material and a preparation method thereof, and the preparation method comprises the following steps: (1) modeling a target structural member; (2) pretreating the titanium alloy substrate; (3) printing a lower titanium alloy layer; (4) printing intermediate copper; (5) printing an upper magnesium alloy layer; and (6) the electric arc additive manufacturing process is adjusted, and the process is repeated. The electric arc additive technology is generally adopted, the electric arc serves as a heat source, the magnesium / titanium metal wires serve as raw materials, instant manufacturing of parts is achieved, and the method is suitable for preparing large magnesium-titanium alloy structural parts. In the material adding process, the metal wires are rapidly solidified and deposited layer by layer, and a more uniform and tighter metallurgical bonding interface is formed. In addition, copper (Cu) is adopted as transition metal, the interface reaction can be improved, the bonding strength of the magnesium / titanium alloy can be improved, and therefore the magnesium / titanium bimetallic material good in mechanical property is obtained. According to the process, the preparation cost is saved, and the manufacturing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of magnesium / titanium bimetallic materials, and in particular to a copper-transition magnesium / titanium bimetallic material and a preparation method thereof. Background Art

[0002] As the lightest metal material to date, magnesium alloys offer advantages such as low density, high specific strength and stiffness, excellent electromagnetic shielding, superior vibration damping, and easy processing and forming. They have broad application prospects in the aerospace and automotive industries. Titanium alloys offer excellent overall performance, including high strength, low density, and excellent corrosion resistance, and are commonly used in high-end fields such as marine engineering, chemical equipment, and aerospace.

[0003] Bimetallic materials are made by joining two metals with different properties through a specific process to form a composite material with special properties. Magnesium / titanium bimetallic materials, made from magnesium alloys and titanium alloys, combine the performance advantages of both metals, performing well in physical properties such as thermal and electrical conductivity, chemical properties such as corrosion resistance, and mechanical properties such as wear resistance. Despite this, the effective combination of magnesium and titanium alloys still faces many challenges. A series of problems, such as the low mutual solubility of magnesium and titanium alloys, the large difference in melting points, and the large differences in thermal conductivity, specific heat, and thermal expansion coefficient, have limited the preparation and application of magnesium / titanium bimetallic materials.

[0004] Currently, common methods for preparing magnesium / titanium bimetallic materials include powder metallurgy, stirring casting, and pressureless infiltration. Patent CN114147203A provides a method for laser shock-induced metallurgical bonding of the magnesium-titanium liquid-solid composite casting interface. Laser shock, ultrasonic cleaning, acid / alkali treatment, and other technologies are used to activate the titanium alloy surface. The magnesium alloy and the treated titanium alloy are then melted together using liquid-solid composite casting to achieve metallurgical bonding of the magnesium / titanium interface. This method is relatively complex, and the surface treatment of the titanium alloy may change the physical and chemical properties of the metal itself. The activation effect directly affects the results of the magnesium-titanium interface bonding.

[0005] Patent CN118699359A discloses a titanium-magnesium bimetallic composite material, its preparation method, and its application. This application utilizes an infiltration method for additive manufacturing, where the titanium alloy skeleton obtained through additive manufacturing is directly infiltrated into a magnesium alloy melt. While this method is simple, it increases material costs and takes a long time to add material, making it unsuitable for large, complex structural parts.

[0006] In summary, the preparation of magnesium / titanium bimetallic materials currently faces problems such as difficulty in forming a stable and strong bonding interface between the bimetallic materials, complex processes, long time and high costs, and unsuitability for large and complex structural parts. In view of this, the present application is filed. Summary of the Invention

[0007] To solve the related problems existing in the prior art, the present invention provides a copper-transitioned magnesium / titanium bimetallic material and a preparation method thereof. Overall, the arc additive manufacturing technology is adopted, with an arc as the heat source and magnesium / titanium metal wires as raw materials, realizing the instant manufacturing of parts and being applicable to the preparation of large magnesium-titanium alloy structural parts. During the additive process, the metal wires rapidly solidify and are deposited layer by layer, forming a more uniform and tighter metallurgical bonding interface. Additionally, copper (Cu) is used as the transition metal, which can improve the interfacial reaction and enhance the bonding strength of the magnesium / titanium alloy, thereby obtaining a magnesium / titanium bimetallic material with better mechanical properties. This process saves the preparation cost and improves the manufacturing efficiency.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] The present invention provides a preparation method for a copper-transitioned magnesium / titanium bimetallic material, comprising the following steps:

[0010] (1) Modeling of the target structural part

[0011] Model the target structural part and generate G-code, import it into the control system, and print in the deposition sequence of titanium / copper / magnesium in turn;

[0012] (2) Pretreatment of the titanium alloy substrate

[0013] Grind and clean the titanium alloy substrate, then fix it on the CNC machine tool, adjust the arc length and wire feeding angle, and fill with argon for protection;

[0014] (3) Printing of the lower-layer titanium alloy

[0015] Preheat the titanium alloy substrate and adjust the preheating parameters; after preheating for 2 cycles, adjust the deposition parameters, start depositing the titanium alloy, and cool it to room temperature;

[0016] (4) Printing of the intermediate copper

[0017] Preheat the top of the titanium alloy and adjust the preheating parameters; after preheating for 2 cycles, adjust the deposition parameters, start depositing the transition copper, and cool it to room temperature;

[0018] (5) Printing of the upper-layer magnesium alloy

[0019] Preheat the top of the copper and adjust the preheating parameters; after preheating for 2 cycles, adjust the deposition parameters, start depositing the magnesium alloy, and cool it to room temperature;

[0020] (6) Adjust the arc additive manufacturing process and repeat the above process.

[0021] Further, in step (1), the target structural part is selected from one or more of the "square" shape, "day" shape, and "one" shape.

[0022] In a set of preferred embodiments of the present application, it is a structural member in the shape of a "mouth".

[0023] Further, in step (2), the arc length is 4 - 8 mm, the wire feeding angle is 30 - 60°, and the argon filling flow rate is 20 - 25 L / min.

[0024] Preferably, the arc length is 5 mm and the wire feeding angle is 60°. Specifically, the arc length refers to the distance from the tip of the tungsten electrode to the titanium alloy substrate; the wire feeding angle refers to the angle between the wire feeding tube and the titanium alloy substrate.

[0025] Further, in step (3), the titanium alloy is deposited using TA15 welding wire; in the deposition parameters, the peak current is 220 - 232 A, the peak current time ratio is 10% - 30%, and the ratio of the base current to the peak current is 10% - 30%.

[0026] Preferably, in the deposition parameters, the peak current is 231 A, the peak current time ratio is 20%, and the ratio of the base current to the peak current is 20%.

[0027] Deposition is carried out using TA15 welding wire, the wire diameter of which is 1.6 mm. In addition to titanium, the main chemical components also include: aluminum 6.69 wt%, zirconium 2.14 wt%, molybdenum 1.65 wt%, vanadium 2.11 wt%, niobium 0 - 0.01 wt%, hafnium 0 - 0.01 wt%. The method of depositing the welding wire layer by layer is conducive to forming a more uniform and tighter titanium / copper bonding interface, facilitating the subsequent deposition of the transition copper.

[0028] Further, in the preheating parameters of the titanium alloy in step (3), the peak current is 250 - 260 A, the peak current time ratio is 20% - 40%, and the ratio of the base current to the peak current is 20% - 25%.

[0029] Preferably, in the preheating parameters, the peak current is 260 A, the peak current time ratio is 30%, and the ratio of the base current to the peak current is 20%.

[0030] Further, in step (4), the transition copper is deposited using S201 welding wire; in the deposition parameters, the peak current is 160 - 185 A, the peak current time ratio is 20% - 28%, and the ratio of the base current to the peak current is 20% - 28%.

[0031] Preferably, in the deposition parameters, the peak current is 160 A, the peak current time ratio is 20%, and the ratio of the base current to the peak current is 20%.

[0032] Deposition is performed using S201 welding wire with a diameter of 1.6mm. In addition to copper, the main chemical components include: 0-1.0wt% tin, 0-0.5wt% silicon, 0-0.5wt% manganese, 0-0.15wt% phosphorus, 0-0.02wt% lead, and 0-0.01wt% aluminum. This layer-by-layer deposition method facilitates the formation of a more uniform and compact titanium / copper / magnesium interface, facilitating interfacial bonding with the titanium alloy and facilitating subsequent magnesium alloy deposition.

[0033] Furthermore, in the preheating parameters of the transition copper in step (4), the peak current is 160-200 A, the peak current time accounts for 20%-30%, and the ratio of the base current to the peak current is 20%-30%.

[0034] Preferably, in the preheating parameters, the peak current is 165A, the peak current time accounts for 25%, and the ratio of the base current to the peak current is 20%.

[0035] Furthermore, the magnesium alloy in step (5) is deposited using AZ91D welding wire; the peak current in the deposition parameters is 110-120A, the peak current time accounts for 10%-15%, and the ratio of base current to peak current is 5%-15%.

[0036] Preferably, in the deposition parameters, the peak current is 120 A, the peak current time accounts for 10%, and the ratio of the base current to the peak current is 10%.

[0037] Deposition was performed using AZ91D welding wire with a diameter of 1.6mm. In addition to magnesium, the main chemical components include: 8.5-9.5wt% aluminum, 0.45-0.9wt% zinc, 0.17-0.4wt% manganese, 0.004wt% iron, 0.08wt% silicon, 0.02wt% copper, and 0.001wt% nickel. The layer-by-layer deposition method facilitates the formation of a more uniform and compact magnesium / copper interface, facilitating bonding with the copper layer.

[0038] Furthermore, in the preheating parameters of the magnesium alloy in step (5), the peak current is 100-150A, the peak current time accounts for 10%-25%, and the ratio of the base current to the peak current is 10%-20%.

[0039] Preferably, in the preheating parameters of the magnesium alloy, the peak current is 135A, the peak current time accounts for 25%, and the ratio of the base current to the peak current is 15%.

[0040] The present invention also provides a copper-transition magnesium / titanium bimetallic material, comprising the copper-transition magnesium / titanium bimetallic material prepared according to the preparation method as described above.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] (1) The present invention provides a method for preparing a copper-transition magnesium / titanium bimetallic material. The method employs arc additive technology to sequentially deposit a titanium alloy layer, a transition copper layer, and a magnesium alloy layer using TA15 welding wire, S201 welding wire, and AZ91D welding wire. During the deposition process, the welding wires rapidly solidify, resulting in a more uniform and stable titanium / copper / magnesium metallurgical interface.

[0043] (2) The present invention provides a method for preparing a copper-transition magnesium / titanium bimetallic material. The magnesium / titanium bimetallic material prepared according to the preparation method provided by the present invention has good mechanical properties and has the dual advantages of the physical and chemical properties of magnesium alloys and titanium alloys. The use of copper as a transition metal can improve the interface reaction and enhance the bonding strength of the magnesium / titanium alloy interface.

[0044] (3) The present invention provides a method for preparing a copper-transition magnesium / titanium bimetallic material. The preparation process is simple, and the instant preparation of structural parts is achieved, which saves preparation costs and improves manufacturing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A schematic structural diagram of a copper-transition magnesium / titanium bimetallic material provided by the present invention;

[0046] Figure 2 A physical picture of a copper-transition magnesium / titanium bimetallic material provided by the present invention;

[0047] Figure 3 A metallographic diagram of the interface of a copper-transition magnesium / titanium bimetallic material provided by the present invention;

[0048] Figure 4 A schematic diagram of the dimensions of a tensile specimen of a copper-transition magnesium / titanium bimetallic material provided by the present invention;

[0049] Figure 5 This is a stress-strain curve of a tensile specimen of a copper-transition magnesium / titanium bimetallic material in Example 1 of the present invention.

[0050] Wherein: welding gun 1; titanium alloy substrate 2; magnesium alloy deposition layer 3; copper deposition layer 4; titanium alloy deposition layer 5. DETAILED DESCRIPTION

[0051] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following embodiments are only descriptive and not restrictive, and the protection scope of the present invention cannot be limited thereby. When expressing a certain quantity, concentration or other value or parameter in the form of a range, a preferred range, or a preferred upper limit and lower limit of a value, it should be understood that any range is equivalently disclosed by combining any pair of upper limits of the range or preferred values with any lower limit of the range or preferred values, regardless of whether the range is specifically disclosed. Unless otherwise indicated, the numerical range values listed herein include the endpoints of the range and all integers and fractions within the range.

[0052] Unless otherwise specified, all percentages, parts, ratios, etc. in this article are by weight.

[0053] The materials, methods and embodiments in this article are all exemplary and should not be construed as restrictive unless otherwise specified. Unless otherwise specified, the materials in this article can be obtained commercially.

[0054] Example 1

[0055] The present invention provides a preparation method of a copper-transitioned magnesium / titanium bimetallic material, which includes the following steps:

[0056] (1) Modeling of the target structural member

[0057] Use CAD software to construct a "mouth" - shaped model of 50mm * 25mm * 100mm, set the parameters: layer height 2.0mm, welding torch 1 moving speed 100mm / min, preheating 2 times, edit the G code, import it into the control system, and print in the deposition order of titanium / copper / magnesium successively, as Figure 1 shown;

[0058] (2) Pretreatment of the titanium alloy substrate

[0059] Grind and clean the TA15 titanium alloy substrate 2 (150mm * 150mm * 5mm), then fix it on the CNC machine tool, adjust the arc length to 5mm and the wire feeding angle to 60°, build an experimental gas protection cover, and fill it with argon for protection. After filling, control the argon flow rate at 20 - 25L / min and keep inflating to ensure an argon environment;

[0060] (3) Printing of the lower - layer titanium alloy

[0061] The peak current was 260A, the peak current duration was 30%, and the base current to peak current ratio was 20%. After two preheating cycles, the deposition parameters were adjusted to: peak current 231A, peak current duration 20%, base current to peak current ratio 20%, welding gun 1 travel speed 100mm / min, wire feed speed 100cm / min, AC wire (200A, 200Hz), and deposition height 50mm. After fabrication, the material was cooled to room temperature to obtain titanium alloy deposition layer 5.

[0062] (4) Intermediate copper printing

[0063] The top of the titanium alloy was preheated, and the preheating parameters were adjusted to: pulse frequency of 1.2 Hz, peak current of 165 A, peak current time ratio of 25%, and base current to peak current ratio of 20%. After two preheating cycles, the deposition parameters were adjusted to: peak current of 160 A, peak current time ratio of 20%, base current to peak current ratio of 20%, welding gun 1 movement speed of 100 mm / min, wire feed speed of 100 cm / min, AC wire (200 A, 200 Hz), and deposition height of 1 mm. After manufacturing, the copper deposit layer 4 was obtained by cooling to room temperature.

[0064] (5) Upper magnesium alloy printing

[0065] Preheat the copper top, adjusting the preheating parameters to: pulse frequency of 1.2Hz, peak current of 135A, peak current time ratio of 25%, and base current to peak current ratio of 15%. After preheating for 2 cycles, adjust the deposition parameters to: peak current of 120A, peak current time ratio of 10%, base current to peak current ratio of 10%, welding gun 1 movement speed of 100mm / min, wire feed speed of 100cm / min, AC wire (200A, 200Hz), and deposition height of 50mm. After manufacturing, cool to room temperature to obtain magnesium alloy deposition layer 3;

[0066] (6) Adjust the arc additive manufacturing process and repeat the above process. Finally, we get Figure 2 Magnesium / titanium bimetallic part shown.

[0067] Example 2

[0068] The present invention provides a method for preparing a copper-transition magnesium / titanium bimetallic material, comprising the following steps:

[0069] (1) Modeling of target structural parts

[0070] Use CAD software to construct a "mouth" - shaped model with dimensions of 50mm * 25mm * 100mm, set parameters: layer height 2.0mm, welding torch 1 moving speed 100mm / min, preheat 2 times, edit G - code, import it into the control system, and print in the deposition order of titanium / copper / magnesium;

[0071] (2) Pretreatment of titanium alloy substrate

[0072] Grind, clean a TA15 titanium alloy substrate (150mm * 150mm * 5mm), then fix it on a CNC machine tool. Adjust the arc length to 5mm and the wire - feeding angle to 60°. Build an experimental gas protection cover and fill it with argon for protection. After filling, control the argon flow rate at 20 - 25L / min and continue to inflate to ensure an argon environment;

[0073] (3) Printing of the lower - layer titanium alloy

[0074] Preheat the titanium alloy substrate. Adjust the preheating parameters as follows: pulse frequency 1.2Hz, peak current 250A, peak - current time - occupancy ratio 30%, ratio of base - current to peak - current 20%. After preheating 2 rounds, adjust the deposition parameters: peak current 220A, peak Moving speed 100mm / min, wire - feeding speed 100cm / min, the hot wire uses alternating current (200A, 200Hz); deposition height 50mm. After manufacturing, cool it to room temperature to obtain a titanium alloy deposition layer;

[0075] (4) Printing of the middle - layer copper

[0076] Preheat the top of the titanium alloy. Adjust the preheating parameters as follows: pulse frequency 1.2Hz, peak current 200A, peak - current time - occupancy ratio 30%, ratio of base - current to peak - current 30%. After preheating 2 rounds, adjust the deposition parameters: peak current 185A, peak Moving speed 100mm / min, wire - feeding speed 100cm / min, the hot wire uses alternating current (200A, 200Hz), deposition height 1mm. After manufacturing, cool it to room temperature to obtain a copper deposition layer;

[0077] (5) Printing of the upper - layer magnesium alloy

[0078] Preheat the copper top, and adjust the preheating parameters as follows: pulse frequency is 1.2 Hz, peak current is 120 A, the ratio of peak current time to the total time is 20%, and the ratio of background current to peak current is 10%. After preheating for 2 laps, adjust the deposition parameters as follows: peak current is 115 A, the ratio of peak current time to the total time is 10%, the ratio of background current to peak current is 10%, the moving speed of torch 1 is 100 mm / min, the wire feeding speed is 100 cm / min, the hot wire uses alternating current (200 A, 200 Hz), and the deposition height is 50 mm. After manufacturing, cool it to room temperature to obtain a magnesium alloy deposition layer;

[0079] (6) Adjust the arc additive manufacturing process and repeat the above process.

[0080] Example 3

[0081] The present invention provides a preparation method of a copper-transitioned magnesium / titanium bimetallic material, including the following steps:

[0082] (1) Modeling of the target structural part

[0083] Use CAD software to construct a "mouth" - shaped model of 50 mm * 25 mm * 100 mm, Edit the G code, import it into the control system, and print in the order of titanium / copper / magnesium deposition;

[0084] (2) Pretreatment of the titanium alloy substrate

[0085] Grind and clean a TA15 titanium alloy substrate (150 mm * 150 mm * 5 mm), then fix it on a CNC machine tool, adjust the arc length to 6 mm and the wire feeding angle to 45°, build an experimental gas protection cover, and fill it with argon for protection. After filling, control the argon flow rate at 20 - 25 L / min and keep inflating to ensure an argon environment;

[0086] (3) Printing of the lower - layer titanium alloy

[0087] Preheat the titanium alloy substrate, and adjust the preheating parameters as follows: pulse frequency is 1.2 Hz, peak current is 260 A, the ratio of peak current time to the total time is 30%, and the ratio of background current to peak current is 20%. After preheating for 2 laps, adjust the deposition parameters as follows: peak current is 232 A,

[0088] The moving speed is 100 mm / min, the wire feeding speed is 100 cm / min, the hot wire uses alternating current (200 A, 200 Hz); the deposition height is 50 mm. After manufacturing, cool it to room temperature to obtain a titanium alloy deposition layer;

[0089] (4) Printing of the middle copper

[0090] Preheat the top of the titanium alloy and adjust the preheating parameters to: pulse frequency 1.2Hz, peak current 170A, peak current time proportion 25%, base current to peak current ratio 25%. After preheating for 2 cycles, adjust the deposition parameters to: peak current 160A, peak current 17 ...

[0091] The moving speed was 100 mm / min, the wire feeding speed was 100 cm / min, the hot wire used AC power (200 A, 200 Hz), and the deposition height was 1 mm. After the fabrication was completed, the copper deposit was cooled to room temperature to obtain a copper deposition layer.

[0092] (5) Upper magnesium alloy printing

[0093] Preheat the copper top and adjust the preheating parameters as follows: pulse frequency 1.2Hz, peak current 135A, peak current time proportion 15%, base current to peak current ratio 15%. After preheating for 2 cycles, adjust the deposition parameters as follows: peak current 113A, peak current

[0094] The wire feed speed is 100 mm / min, the wire feeding speed is 100 cm / min, the hot wire uses AC power (200 A, 200 Hz), and the deposition height is 50 mm. After the manufacturing is completed, it is cooled to room temperature to obtain a magnesium alloy deposition layer;

[0095] (6) Adjust the arc additive manufacturing process and repeat the above process.

[0096] Performance Testing

[0097] This application takes Example 1 as an example to conduct a performance test on a prepared copper-transition magnesium / titanium bimetallic material, specifically including:

[0098] Test Example 1 Interface Metallographic Microstructure Observation

[0099] With the copper layer as the center, a block sample with a height of 20mm, a width of 10mm, and a thickness of 8mm was cut out near the interface of the sample. It was mechanically ground using 1000 mesh, 1500 mesh, 2000 mesh, 5000 mesh, and 7000 mesh sandpaper in sequence, and then manually polished for 80 seconds using a magnesium alloy special polishing liquid. The microstructure was observed under a metallographic microscope. The results are as follows: Figure 3 As shown, the thickness of the copper layer is about 1 mm, there are no micro cracks at the titanium / copper interface and the copper / magnesium interface, and the interface bonding is good.

[0100] Test Example 2: Room Temperature Mechanical Properties Test

[0101] With the copper layer as the center, cut out the following Figure 4 The tensile test specimens shown were tested for room temperature mechanical properties using an Instron 5966 electronic universal material testing machine. Figure 5 As shown in the figure, it can be seen that the optimal tensile strength is 106MPa, the yield strength is 100MPa, and the elongation after fracture is 0.2%.

[0102] Thus, the bimetallic material produced using the copper-transition magnesium / titanium bimetallic material preparation method provided by the preferred embodiment of the present invention exhibits a stable and uniform bonding interface. Using copper as the transition metal improves interfacial reactions and enhances mechanical properties such as tensile strength and yield strength.

[0103] There is no special limitation on the specific method of writing the G code and the machine tool control system described in the above embodiments. Their function is to realize the movement of the welding gun and can be achieved by using methods familiar to those skilled in the art.

[0104] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. 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 or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A method for preparing a copper-transition magnesium / titanium bimetallic material, characterized in that: It includes the following steps: (1) Modeling of the target structural component Model the target structural component and generate G-code, import it into the control system, and print it in the deposition sequence of titanium / copper / magnesium in turn; (2) Pretreatment of the titanium alloy substrate Grind and clean the titanium alloy substrate, fix it on the CNC machine tool, adjust the arc length and wire feeding angle, and fill it with argon for protection; (3) Printing of the lower-layer titanium alloy Preheat the titanium alloy substrate and adjust the preheating parameters; after preheating for 2 cycles, adjust the deposition parameters, start depositing the titanium alloy and cool it to room temperature; (4) Printing of the intermediate copper Preheat the top of the titanium alloy and adjust the preheating parameters; after preheating for 2 cycles, adjust the deposition parameters, start depositing the transition copper and cool it to room temperature; (5) Printing of the upper-layer magnesium alloy Preheat the top of the copper and adjust the preheating parameters; after preheating for 2 cycles, adjust the deposition parameters, start depositing the magnesium alloy and cool it to room temperature; (6) Adjust the arc additive manufacturing process and repeat the above process.

2. The preparation method according to claim 1, characterized in that The target structural component described in step (1) is selected from one or more of the "mouth" shape, "day" shape, and "one" shape.

3. The preparation method according to claim 1, characterized in that In step (2), the arc length is 4-8 mm, the wire feeding angle is 30-60°, and the argon filling flow rate is 20-25 L / min.

4. The preparation method according to claim 1, characterized in that In step (3), the titanium alloy is deposited using TA15 welding wire; in the deposition parameters, the peak current is 220-232 A, the peak current time ratio is 10%-30%, and the ratio of the base current to the peak current is 10-30%.

5. The preparation method according to claim 1, characterized in that In the preheating parameters of the titanium alloy in step (3), the peak current is 250-260 A, the peak current time ratio is 20%-40%, and the ratio of the base current to the peak current is 20%-25%.

6. The preparation method according to claim 1, characterized in that In step (4), the transition copper is deposited using S201 welding wire; in the deposition parameters, the peak current is 160-185 A, the peak current time ratio is 20%-28%, and the ratio of the base current to the peak current is 20%-28%.

7. The preparation method according to claim 1, characterized in that In the preheating parameters of the transition copper in step (4), the peak current is 160-200 A, the peak current time ratio is 20%-30%, and the ratio of the base current to the peak current is 20%-30%.

8. The preparation method according to claim 1, characterized in that In step (5), the magnesium alloy is deposited using AZ91D welding wire; in the deposition parameters, the peak current is 110-120 A, the peak current time ratio is 10%-15%, and the ratio of the base current to the peak current is 5%-15%.

9. The preparation method according to claim 1, characterized in that In the preheating parameters of the magnesium alloy in step (5), the peak current is 100-150 A, the peak current time ratio is 10%-25%, and the ratio of the base current to the peak current is 10%-20%.

10. A copper-transition magnesium / titanium bimetallic material, characterized in that: It includes the copper-transitioned magnesium / titanium bimetallic material prepared by the preparation method according to any one of claims 1-9.

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