Aluminum-copper alloy wire suitable for arc additive manufacturing and preparation method thereof

Abstract

This invention relates to an aluminum-copper alloy wire suitable for arc additive manufacturing and its preparation method. The wire, by mass percentage, comprises: copper (Cu): 5.5–6.5%, manganese (Mn): 0.4–0.55%, magnesium (Mg): 0.02%, zinc (Zn): 0.1%, vanadium (V): 0.3–0.4%, titanium (Ti): 0.45–0.6%, zirconium (Zr): 0.3–0.45%, cerium (Ce): 0.08–0.16%, iron (Fe): 0.08%, silicon (Si): 0.06%, with the balance being aluminum (Al) or impurities. High-quality aluminum-copper alloy wire is prepared by batching, alloy smelting, semi-continuous casting, homogenization treatment, ingot surface treatment, and hot extrusion drawing according to the above alloy composition ratio. After arc additive manufacturing and solution aging, the sample exhibits a tensile strength greater than 474 MPa, a yield strength greater than 372 MPa, an elongation greater than 15.5%, and no plastic anisotropy in the transverse and longitudinal directions.

Description

Technical Field

[0001] This invention relates to the technical field of additive manufacturing of metal materials, and in particular to an aluminum-copper alloy wire suitable for arc additive manufacturing and its preparation method. Background Technology

[0002] Aluminum-copper alloys possess excellent high and low temperature mechanical properties, good corrosion resistance, and weldability, making them widely used in the manufacture of load-bearing structures such as rocket propellant tanks, transition rings, and frame beams. Current manufacturing processes for large-size, complex aluminum-copper alloy components mainly involve large-scale ingot casting, homogenization heat treatment, multi-directional forging, punching, reaming, ring rolling, deformation heat treatment, and machining. These processes are complex, have long production cycles, and are costly. With the widespread adoption of integrated structural / functional / performance design for aluminum alloy components in new-generation equipment, previously separate components are being replaced by integral ones, demanding increasingly higher standards for consistent mechanical properties. Existing traditional manufacturing technologies are no longer sufficient to meet the demands for high-efficiency, low-cost, and high-performance manufacturing.

[0003] Arc additive manufacturing technology, based on a three-dimensional slicing model, uses an electric arc to melt a wire and deposit it layer by layer along a planned path to prepare a blank component. With the addition of minimal machining, large-size, high-performance, dense, and complex components can be fabricated, making it highly suitable for the fabrication of large-size, complex structures. Relevant domestic and international literature has verified the feasibility of arc additive manufacturing of aluminum alloy components.

[0004] The application of arc additive manufacturing technology relies on the preparation of high-performance specialized wires to ensure stable wire feeding, uniform droplet transfer, and homogeneous composition and microstructure during the arc additive manufacturing process. This, in turn, ensures the stability of the chemical composition, macro- and micro-structure, and mechanical properties of the components manufactured using arc additive manufacturing. Existing aluminum-copper alloy wires are primarily prepared based on traditional welding requirements, resulting in poor uniformity in chemical composition and microstructure. Furthermore, they do not consider the impact of complex thermal cycles during arc additive manufacturing, such as rapid melting / solidification / local remelting / localized short-term thermal effects. Therefore, there is an urgent need to develop specialized wires specifically for aluminum-copper alloy arc additive manufacturing.

[0005] Currently published aluminum-copper alloy wires for arc additive manufacturing primarily reduce interlayer phase precipitation and plastic anisotropy by lowering the content of impurity elements (such as Fe and Si). They also improve strength by adding trace alloying elements (such as Ti and Zr) to form Al3(Ti,Zr) dispersed particles, refining the α-Al matrix. However, the proportions of these trace alloying elements are not clearly defined, and their comprehensive strengthening effects are not fully considered. This can easily lead to excessive content, forming intermetallic compounds and reducing the tensile properties of aluminum-copper alloy arc additively formed components. Summary of the Invention

[0006] This invention provides an aluminum-copper alloy wire suitable for arc additive manufacturing and its preparation method. The aluminum-copper alloy wire of this invention has a smooth production process, uniform composition and microstructure, and is suitable for arc additive manufacturing. In this invention, while controlling the content of trace alloying elements, the grain boundary element Ce is added to further refine the grains and form a dispersed precipitate phase. After arc additive forming and solution quenching aging heat treatment, the component has a fine grain structure, uniformly distributed strengthening phases, tensile strength greater than 474 MPa, yield strength greater than 372 MPa, elongation greater than 15.5%, and no plastic anisotropy in the transverse and longitudinal directions.

[0007] In the first aspect, an aluminum-copper alloy wire suitable for arc additive manufacturing is provided, with the following composition by mass percentage: copper Cu: 5.5-6.5%, manganese Mn: 0.4-0.55%, magnesium Mg: ≤0.02%, zinc Zn: ≤0.1%, vanadium V: 0.3-0.4%, titanium Ti: 0.45-0.6%, zirconium Zr: 0.3-0.45%, cerium Ce: 0.08-0.16%, iron Fe: ≤0.08%, silicon Si: ≤0.06%, other single impurity elements: ≤0.05%, other impurity element alloys: ≤0.15%, and the balance being aluminum Al.

[0008] In conjunction with the first aspect, in some implementations of the first aspect, the composition of the aluminum-copper alloy wire by mass percentage is as follows: copper Cu: 5.5-6%, manganese Mn: 0.5-0.55%, vanadium V: 0.3-0.35%, titanium Ti: 0.45-0.5%, zirconium Zr: 0.3-0.33%, cerium Ce: 0.08-0.10%.

[0009] In conjunction with the first aspect, in some implementations of the first aspect, the composition of the aluminum-copper alloy wire by mass percentage is as follows: copper Cu: 6-6.5%, manganese Mn: 0.4-0.55%, vanadium V: 0.35-0.4%, titanium Ti: 0.5-0.6%, zirconium Zr: 0.33-0.4%, cerium Ce: 0.1-0.16%.

[0010] In conjunction with the first aspect, in some implementations of the first aspect, the mass percentage ratio of Ti:Zr is 1.5:1.

[0011] In conjunction with the first aspect, in some implementations of the first aspect, the aluminum-copper alloy wire has an Al3(Ti,Zr) phase and a Ti2Cu phase formed in the aluminum matrix.

[0012] In conjunction with the first aspect, in some implementations of the first aspect, aluminum-copper alloy wires are used in arc additive manufacturing, forming θ(Al2Cu) microstructure in both the deposited state and after solution failure.

[0013] Secondly, a method for preparing aluminum-copper alloy wire as described in any of the implementations of the first aspect above is provided, comprising:

[0014] (1) Batching: Select pure Al, Al-Cu master alloy, Al-Mn master alloy, Al-Fe master alloy, Al-Ce master alloy, Al-Zr master alloy, and Al-Ti master alloy, and mix them according to the composition ratio;

[0015] (2) Alloy smelting: The prepared metal raw materials are smelted under vacuum at a temperature of 750-850℃ for 2-3 hours.

[0016] (3) Semi-continuous casting: After the melt has settled, it is continuously cast at a speed of 200-250 mm / min to obtain an ingot;

[0017] (4) Homogenization treatment: The ingot is placed in an annealing furnace for homogenization treatment. The temperature is raised to 540-550℃ and then held to obtain a homogenized ingot.

[0018] (5) Surface treatment of ingots: The homogenized ingots are surface-turned to remove the oxide scale and oil stains. The surface roughness Ra<3.2, and the surface-treated ingots are obtained.

[0019] (6) Hot extrusion processing: The surface-treated ingot is extruded at a speed of 12-14 mm / s to obtain a bar with a diameter of Φ8-10 mm.

[0020] (7) Drawing process: The prepared bar is subjected to multiple drawing and annealing processes to obtain wire with a diameter of Φ1.29mm;

[0021] (8) Scraping treatment: The prepared filament is scraped and peeled to a thickness of 0.06-0.1 mm to remove the surface oxide film and obtain solid filament.

[0022] (9) Ultrasonic cleaning treatment: The solid filament is ultrasonically cleaned for 10-15 minutes and then dried.

[0023] In conjunction with the second aspect, in some implementations of the second aspect, the cooling rate in step (3) is 100-120 K / s.

[0024] In conjunction with the second aspect, in some implementations of the second aspect, the settling time in step (3) is 20-30 minutes.

[0025] In conjunction with the second aspect, in some implementations of the second aspect, the homogenization time in step (4) is 25-30h.

[0026] Compared with the prior art, the solution provided by the present invention has at least the following beneficial technical effects:

[0027] 1. This invention further increases the Mn content, increases the amount of T phase, and refines the α-Al matrix grains. It also increases the V content, further reducing the hot cracking sensitivity of aluminum-copper alloys and improving the crack resistance of arc additive manufacturing components and subsequent solution quenching.

[0028] 2. This invention adjusts the ratio of Ti and Zr elements, which has a significant effect on refining the matrix grains, inhibiting recrystallization, and preventing the formation of intergranular phases that cause cracking.

[0029] 3. This invention incorporates Ce, which promotes matrix nucleation and increases the growth stability of the spherical interface, thereby achieving Al... 13 Fe phase transformation improves the strength and plasticity of the alloy.

[0030] 4. The aluminum-copper alloy wire of the present invention, after being formed by electric arc additive manufacturing and subjected to solution aging heat treatment, has a tensile strength of 475-505 MPa, a yield strength of 367-394 MPa, and an elongation of 13.2-16.4%, and exhibits no plastic anisotropy in the transverse and longitudinal directions, thus meeting the requirements for aerospace applications. Attached Figure Description

[0031] Figure 1 The depositional microstructure of aluminum-copper alloy by arc additive manufacturing is mainly composed of equiaxed dendritic solidification, with α(Al) as the dendrites and α(Al) + θ(Al2Cu) symbiotic eutectic between the dendrites. The eutectic is in the form of a continuous network (the gray phase in the figure).

[0032] Figure 2 The solid solution aging microstructure of aluminum-copper alloy produced by arc additive manufacturing shows discontinuously distributed granular θ(Al2Cu) phases (gray) and strip-shaped iron-rich impurity phases (black) between grains, with fine θ(Al2Cu) residual phases within the dendrites. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0034] This invention provides an aluminum-copper alloy wire suitable for arc additive manufacturing, with the following composition by mass percentage: Copper Cu: 5.5-6.5%, Manganese Mn: 0.4-0.55%, Magnesium Mg: ≤0.02%, Zinc Zn: ≤0.1%, Vanadium V: 0.3-0.4%, Titanium Ti: 0.45-0.6%, Zirconium Zr: 0.3-0.45%, Cerium Ce: 0.08-0.16%, Iron Fe: ≤0.08%, Silicon Si: ≤0.06%, Other single impurity elements (non-alloy): ≤0.05%, Other impurity element alloys: ≤0.15%, and the balance being aluminum Al.

[0035] In a preferred embodiment, the composition of the aluminum-copper alloy wire suitable for arc additive manufacturing is as follows by mass percentage: copper (Cu): 5.5-6%, manganese (Mn): 0.5-0.55%, magnesium (Mg): ≤0.02%, zinc (Zn): ≤0.1%, vanadium (V): 0.3-0.35%, titanium (Ti): 0.45-0.5%, zirconium (Zr): 0.3-0.33%, cerium (Ce): 0.08-0.10%, iron (Fe): ≤0.08%, silicon (Si): ≤0.06%, other single impurity elements: ≤0.05%, other impurity element alloys: ≤0.15%, and the balance is aluminum (Al).

[0036] In a preferred embodiment, the composition of the aluminum-copper alloy wire suitable for arc additive manufacturing, by mass percentage, is as follows: Copper (Cu): 6-6.5%, Manganese (Mn): 0.4-0.55%, Magnesium (Mg): ≤0.02%, Zinc (Zn): ≤0.1%, Vanadium (V): 0.35-0.4%, Titanium (Ti): 0.5-0.6%, Zirconium (Zr): 0.33-0.4%, Cerium (Ce): 0.1-0.16%, Iron (Fe): ≤0.08%, Silicon (Si): ≤0.06%, Other single impurity elements: ≤0.05%, Other impurity element alloys: ≤0.15%, with the balance being aluminum (Al).

[0037] In a preferred embodiment, the mass percentage of Ti:Zr is 1.5:1.

[0038] Cu is a strengthening element in the α-Al matrix. After solution treatment and aging, it precipitates a nano-scale θ' phase with Al, which improves the strength of the alloy. Mn forms a T phase with Al and Cu, which is dispersed during solution treatment, preventing recrystallization of the aluminum alloy, increasing the recrystallization temperature, and significantly refining the recrystallized grains, thereby improving room temperature and high temperature strength.

[0039] V can prevent the aggregation and coarsening of grain boundary precipitates, reduce the susceptibility of aluminum-copper alloys to hot cracking, and improve the room temperature strength and plasticity of the alloys.

[0040] The addition of Ti and Zr to the alloy serves two main purposes: First, the enrichment of Ti and Zr at the solidification front of the ingot can generate significant compositional undercooling, forming fine equiaxed grains. Second, Ti and Zr react with Al to form the Al3(Ti,Zr) second phase. These second-phase particles pin dislocations and matrix grain boundaries, hindering grain boundary migration. These particles also act as nucleation sites for matrix recrystallization, refining the α-Al matrix grains and improving strength and plasticity. Specifically, in the alloy composition, when Ti:Zr = 1.5:1 by mass percentage, ensuring a Ti:Zr ratio of 1:1 ensures the formation of the Al3(Ti,Zr) second phase to refine the grains. Simultaneously, the remaining Ti can react with Cu to form the Ti2Cu phase, creating dispersed nucleation sites that refine the original α-Al matrix grains, prevent the formation of cracked intergranular phases, and further enhance strength and plasticity.

[0041] The addition of Ce to the alloy reduces the contact angle between heterogeneous nucleation particles and the α-Al matrix, promoting nucleation, increasing grain number, and refining the α-Al matrix size. Furthermore, Ce adsorbs on the phase surface, reducing the anisotropy of the solid-liquid interface, decreasing the concentration gradient at the solid-liquid interface front and the interfacial diffusion rate, increasing the stability of spherical interface growth, and achieving Al… 13 Fe phase transformation improves the strength and plasticity of the alloy.

[0042] This invention provides a method for preparing aluminum-copper alloy wire suitable for arc additive manufacturing, which can be prepared according to the following steps:

[0043] (1) Batching: Select pure Al, Al-Cu master alloy, Al-Mn master alloy, Al-Fe master alloy, Al-Ce master alloy, Al-Zr master alloy, and Al-Ti master alloy, and mix them according to the composition ratio;

[0044] (2) Alloy smelting: The prepared metal raw materials are smelted under vacuum at a temperature of 750-850℃ for 2-3 hours.

[0045] (3) Semi-continuous casting: After the melt has settled, it is continuously cast at a speed of 200-250 mm / min to obtain an ingot;

[0046] (4) Homogenization treatment: The ingot is placed in an annealing furnace for homogenization treatment. The temperature is raised to 540-550℃ and then held to obtain a homogenized ingot.

[0047] (5) Surface treatment of ingots: The homogenized ingots are surface-turned to remove the oxide scale and oil stains. The surface roughness Ra<3.2, and the surface-treated ingots are obtained.

[0048] (6) Hot extrusion processing: The surface-treated ingot is extruded at a speed of 12-14 mm / s to obtain a bar with a diameter of Φ8-10 mm.

[0049] (7) Drawing process: The prepared bar is subjected to multiple drawing and annealing processes to obtain wire with a diameter of Φ1.29mm;

[0050] (8) Scraping treatment: The prepared filament is scraped and peeled to a thickness of 0.06-0.1 mm to remove the surface oxide film and obtain solid filament.

[0051] (9) Ultrasonic cleaning treatment: The solid filament is ultrasonically cleaned for 10-15 minutes and then dried.

[0052] Furthermore, in the filament, the mass percentage ratio of Ti:Zr is 1.5:1.

[0053] Furthermore, the cooling rate in step (3) is 100-120 K / s.

[0054] Furthermore, the settling time in step (3) is 20-30 minutes.

[0055] Furthermore, the homogenization time in step (4) is 25-30 hours.

[0056] The smooth progress of the wire production process is mainly due to the following three factors: 1) After melting, the wire is allowed to stand for 20-30 minutes to ensure uniform melt composition. The casting cooling rate is 100-120 K / s, which ensures good heat dissipation during the casting process, high crystallization efficiency, reduced component segregation, and more uniform chemical composition. At the same time, the rapid solidification of the high-temperature melt can refine the grains, which is beneficial to subsequent extrusion and drawing processes; 2) Homogenization treatment decomposes the non-equilibrium eutectic structure in the ingot into the matrix, and supersaturated solid solution elements precipitate from the matrix, eliminating casting residual stress and improving the uniformity of casting composition and structure; 3) Wire scraping and ultrasonic cleaning treatments improve the surface quality of the wire, ensuring the stability and surface quality of subsequent arc additive forming wire feeding.

[0057] In summary, this invention realizes the arc additive manufacturing of aluminum-copper alloy wires, providing a new, efficient, and high-performance printing solution for large-size, complex applications. Wires prepared using this method, after arc additive manufacturing and solution aging, exhibit tensile strengths of 474–495 MPa, yield strengths of 372–386 MPa, and elongation of 15.5–18.6%, with no transverse or longitudinal plastic anisotropy.

[0058] Example 1

[0059] This invention relates to an aluminum-copper alloy wire suitable for arc additive manufacturing and its preparation method. The alloy composition, by mass percentage, is as follows: copper (Cu): 5.5%, manganese (Mn): 0.4%, magnesium (Mg): 0.02%, zinc (Zn): 0.1%, vanadium (V): 0.3%, titanium (Ti): 0.45%, zirconium (Zr): 0.3%, cerium (Ce): 0.08%, iron (Fe): 0.06%, silicon (Si): 0.06%, other single impurity elements: ≤0.05%, other impurity element alloys: ≤0.15%, and the balance is aluminum (Al).

[0060] The production process of aluminum-copper alloy wire is as follows:

[0061] (1) Batching: Select pure Al, Al-Cu master alloy, Al-Mn master alloy, Al-Fe master alloy, Al-Ce master alloy, Al-Zr master alloy, and Al-Ti master alloy, and mix them according to the composition ratio; mix the ingredients according to the above composition ratio;

[0062] (2) Alloy smelting: The prepared metal raw materials are placed in a vacuum smelting furnace for vacuum smelting. The vacuum degree is 5 Pa, the smelting temperature is 800℃, and the smelting time is 2 hours to obtain molten raw materials.

[0063] (3) Semi-continuous casting: After the melt is allowed to stand for 20 minutes, it is poured into a water-cooled mold with a diameter of Ф120mm. The cooling rate of the water-cooled mold is 120K / s, and the continuous casting speed is 220mm / min to obtain an ingot.

[0064] (4) Homogenization treatment: The ingot is placed in an annealing furnace for homogenization treatment. The temperature is increased to 540℃ at 10℃ / min and then held for 30h to obtain a homogenized ingot.

[0065] (5) Surface treatment of ingots: Remove the head and tail of the homogenized ingot, and use a lathe to process the ingot into a Ф120mm×600mm ingot. Remove the surface oxide scale and oil stains to ensure that the surface roughness Ra<3.2 of the ingot and obtain a smooth ingot.

[0066] (6) Hot extrusion processing: The smooth casting ingot is extruded using a hot extrusion press at a speed of 12 mm / s to obtain Φ10 mm bars.

[0067] (7) Drawing process: The prepared bar is subjected to 10 drawing and annealing processes to obtain wire with a diameter of Φ1.29mm;

[0068] (8) Scraping treatment: The prepared filament is scraped and peeled to a thickness of 0.1 mm to remove the surface oxide film and obtain solid filament.

[0069] (9) Ultrasonic cleaning treatment: The solid filament is ultrasonically cleaned for 15 minutes and then dried to obtain the final product.

[0070] Example 2

[0071] This invention relates to an aluminum-copper alloy wire suitable for arc additive manufacturing and its preparation method. The alloy composition, by mass percentage, is as follows: copper (Cu): 6%, manganese (Mn): 0.5%, magnesium (Mg): 0.02%, zinc (Zn): 0.1%, vanadium (V): 0.35%, titanium (Ti): 0.5%, zirconium (Zr): 0.33%, cerium (Ce): 0.1%, iron (Fe): 0.06%, silicon (Si): 0.06%, other single impurity elements: ≤0.05%, other impurity element alloys: ≤0.15%, and the balance is aluminum (Al).

[0072] The aluminum-copper alloy wire production process is shown in Example 1, which can produce a final Φ1.2mm wire.

[0073] Example 3

[0074] This invention relates to an aluminum-copper alloy wire suitable for arc additive manufacturing and its preparation method. The alloy composition, by mass percentage, is as follows: copper (Cu): 6.5%, manganese (Mn): 0.55%, magnesium (Mg): 0.02%, zinc (Zn): 0.1%, vanadium (V): 0.3%, titanium (Ti): 0.6%, zirconium (Zr): 0.45%, cerium (Ce): 0.12%, iron (Fe): 0.06%, silicon (Si): 0.06%, other single impurity elements: ≤0.05%, other impurity element alloys: ≤0.15%, and the balance is aluminum (Al).

[0075] The aluminum-copper alloy wire production process is shown in Example 1, which can produce a final Φ1.2mm wire.

[0076] Comparative Example 1

[0077] The alloying elements in the comparative example, by mass percentage, are: copper (Cu): 5.8%, manganese (Mn): 0.4%, magnesium (Mg): 0.02%, zinc (Zn): 0.1%, vanadium (V): 0.15%, titanium (Ti): 0.2%, zirconium (Zr): 0.1%, iron (Fe): 0.06%, silicon (Si): 0.06%, other single impurity elements: ≤0.05%, other impurity element alloys: ≤0.15%, and the balance is aluminum (Al).

[0078] The aluminum-copper alloy wire production process is shown in Example 1, which can produce a final Φ1.2mm wire. Using 1.2mm diameter wires prepared in Comparative Example 1, Example 1, Example 2, and Example 3 as raw materials, component forming and solution aging treatments were performed using arc additive manufacturing equipment. Figure 1 As shown, the aluminum-copper alloy sample deposited in the arc additive manufacturing process of Example 1 exhibits an α(Al)+θ(Al₂Cu) microstructure. (As...) Figure 2 As shown, the aluminum-copper alloy solution-aged (535℃ / 2h / water-cooled + 175℃ / 4h / air-cooled) samples exhibit α(Al) + iron-rich impurity phases + fine θ(Al₂Cu) residual phases within the grains. As shown in Table 1, the properties of the formed components are as follows: tensile strength 474–495 MPa, yield strength 372–386 MPa, and elongation 15.5–18.6%.

[0079] Table 1 Comparison of tensile properties of aluminum-copper alloy arc additive manufacturing components after solution treatment and aging.

[0080]

[0081] As shown in Table 1, the aluminum-copper alloy wire prepared using this invention, by adjusting the content of Cu and Mn matrix strengthening elements, controlling the content of Ti and Zr elements to refine the grains while preventing cracking and intergranular phase formation, and adding Ce element to further refine the grains, improves the strength and plasticity of the component, and eliminates plastic anisotropy. The aluminum-copper alloy wire described in this invention is more suitable for arc additive manufacturing.

[0082] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope defined in the claims of the present invention.

Claims

1. A type of aluminum-copper alloy wire suitable for arc additive manufacturing, characterized in that, The composition by mass percentage is as follows: Copper Cu: 5.5-6.5%, Manganese Mn: 0.4-0.55%, Magnesium Mg: ≤0.02%, Zinc Zn: ≤0.1%, Vanadium V: 0.3-0.4%, Titanium Ti: 0.45-0.6%, Zirconium Zr: 0.3-0.45%, Cerium Ce: 0.08-0.16%, Iron Fe: ≤0.08%, Silicon Si: ≤0.06%, Other single impurity elements: ≤0.05%, Other impurity element alloys: ≤0.15%, and the balance is aluminum Al.

2. The aluminum-copper alloy wire according to claim 1, characterized in that, The aluminum-copper alloy wire has the following composition by mass percentage: copper Cu: 5.5-6%, manganese Mn: 0.5-0.55%, vanadium V: 0.3-0.35%, titanium Ti: 0.45-0.5%, zirconium Zr: 0.3-0.33%, and cerium Ce: 0.08-0.10%.

3. The aluminum-copper alloy wire according to claim 1, characterized in that, The aluminum-copper alloy wire has the following composition by mass percentage: copper Cu: 6-6.5%, manganese Mn: 0.4-0.55%, vanadium V: 0.35-0.4%, titanium Ti: 0.5-0.6%, zirconium Zr: 0.33-0.4%, and cerium Ce: 0.1-0.16%.

4. The aluminum-copper alloy wire according to any one of claims 1 to 3, characterized in that, The mass percentage ratio of Ti to Zr is 1.5:

1.

5. The aluminum-copper alloy wire according to claim 4, characterized in that, The aluminum-copper alloy wire has Al3(Ti,Zr) phase and Ti2Cu phase formed in the aluminum matrix.

6. The aluminum-copper alloy wire according to any one of claims 1 to 3 and 5, characterized in that, Aluminum-copper alloy wires are used in arc additive manufacturing, and θ(Al2Cu) microstructure is formed in both the deposited state and after solid solution failure.

7. A method for preparing an aluminum-copper alloy wire as described in any one of claims 1 to 6, characterized in that, include: (1) Batching: Select pure Al, Al-Cu master alloy, Al-Mn master alloy, Al-Fe master alloy, Al-Ce master alloy, Al-Zr master alloy, and Al-Ti master alloy, and mix them according to the composition ratio; (2) Alloy smelting: The prepared metal raw materials are smelted under vacuum at a temperature of 750-850℃ for 2-3 hours. (3) Semi-continuous casting: After the melt has settled, it is continuously cast at a speed of 200-250 mm / min to obtain an ingot; (4) Homogenization treatment: The ingot is placed in an annealing furnace for homogenization treatment. The temperature is raised to 540-550℃ and then held to obtain a homogenized ingot. (5) Surface treatment of ingots: The homogenized ingots are surface-turned to remove the oxide scale and oil stains. The surface roughness Ra<3.2, and the surface-treated ingots are obtained. (6) Hot extrusion processing: The surface-treated ingot is extruded at a speed of 12-14 mm / s to obtain a bar with a diameter of Φ8-10 mm. (7) Drawing process: The prepared bar is subjected to multiple drawing and annealing processes to obtain wire with a diameter of Φ1.29mm; (8) Scraping treatment: The prepared filament is scraped and peeled to a thickness of 0.06-0.1 mm to remove the surface oxide film and obtain solid filament. (9) Ultrasonic cleaning treatment: The solid filament is ultrasonically cleaned for 10-15 minutes and then dried.

8. The aluminum-copper alloy wire according to claim 7, characterized in that, The cooling rate in step (3) is 100-120 K / s.

9. The aluminum-copper alloy wire according to claim 7, characterized in that, The settling time in step (3) is 20-30 minutes.

10. The aluminum-copper alloy wire according to claim 7, characterized in that, The homogenization time in step (4) is 25-30 hours.

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