A kind of high-temperature-resistant aluminum alloy wire suitable for electric arc fuse additive manufacturing and a preparation method thereof

Abstract

This invention discloses a high-temperature resistant aluminum alloy wire suitable for arc-fused-wire additive manufacturing and its preparation method. The alloy wire comprises: manganese (Mn): 0.3-0.5%, copper (Cu): 5.3-5.8%, titanium (Ti): 0.15-0.35%, boron (B): 0.0005-0.006%, vanadium (V): 0.05-0.3%, zirconium (Zr): 0.05-0.2%, cadmium (Cd): 0-0.4%, silicon carbide (SiC): 0.1-0.4%, iron (Fe): ≤0.15%, silicon (Si): ≤0.06%, magnesium (Mg): ≤0.05%, zinc (Zn): ≤0.1%, other individual impurity elements: ≤0.05%, total other impurity elements: ≤0.15%, and the balance being aluminum (Al). The wire of this invention exhibits a uniform microstructure and moderate strength. The deposit formed by the arc-fused-wire additive manufacturing process possesses excellent strength, toughness, and other mechanical properties, with significantly improved heat resistance.

Description

Technical Field

[0001] This invention belongs to the field of metallic materials, specifically relating to a high-temperature resistant aluminum alloy wire suitable for arc welding additive manufacturing and its preparation method. Technical Background

[0002] Hypersonic vehicles possess advantages such as long range, high speed, and strong penetration capabilities. During flight, the surface temperature of structural components rises due to air friction, requiring these components to have strong load-bearing capacity at high temperatures—that is, excellent high-temperature performance. Hypersonic vehicle structural components are coated with heat-resistant coatings, and the weight of these coatings is generally greater than the weight of the structural components themselves. Therefore, improving the high-temperature performance of the structural components helps to achieve overall weight reduction, thereby increasing the vehicle's range. The heat resistance of materials is a key factor in improving the high-temperature load-bearing capacity of structural components.

[0003] Hypersonic aircraft structural components are typically irregularly shaped and thin-walled, making them difficult to manufacture using traditional methods. Arc-wire additive manufacturing technology, employing a "discrete-stacking" principle, transforms complex three-dimensional components into two-dimensional structures, significantly reducing the difficulty of producing such complex components. Furthermore, arc-wire additive manufacturing technology offers advantages such as rapid design response, low overall manufacturing costs, and the ability to achieve digital and intelligent manufacturing. Whether in the product development or mass production phase, producing shell-type structural components using arc-wire additive manufacturing technology offers significant advantages.

[0004] However, the high-temperature performance of aluminum alloys currently suitable for arc-wire additive manufacturing is generally low. Taking Al-Cu alloy 2319 as an example, after being formed by arc-wire additive manufacturing, the room temperature tensile strength of its aggregate reaches 470 MPa, but the mechanical properties after holding at 200℃ for 30 minutes are only 300 MPa, a significant decrease. Research has found that high-strength aluminum alloys generally improve their strength by precipitating transition phases. These transition phases are metastable and cannot exist stably at high temperatures. They rapidly coarsen and grow during high-temperature processes, causing a significant reduction in the alloy's mechanical properties. Therefore, introducing a phase that exists stably at high temperatures into aluminum alloys is an effective way to improve high-temperature performance. Researchers have attempted to add ceramic powder to aluminum alloys to improve high-temperature performance, but due to the density and powder segregation issues of ceramic powder, it is difficult to effectively incorporate the ceramic powder into the aluminum alloy, making it unsuitable for practical production. Summary of the Invention

[0005] The purpose of this invention is to provide a high-temperature resistant aluminum alloy wire suitable for arc welding additive manufacturing. The aluminum alloy wire described in this invention has a smooth processing flow, fine grains, and a uniform microstructure, making it suitable for arc welding additive manufacturing. After heat treatment, the additively formed deposit exhibits fine and uniform grains, with dispersed reinforcing phases, resulting in excellent room temperature and high-temperature performance.

[0006] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows:

[0007] A high-temperature resistant aluminum alloy wire suitable for additive manufacturing of arc fuse wires has the following composition by mass percentage: manganese (Mn): 0.3-0.5%, copper (Cu): 5.3-5.8%, titanium (Ti): 0.15-0.35%, boron (B): 0.0005-0.006%, vanadium (V): 0.05-0.3%, zirconium (Zr): 0.05-0.2%, cadmium (Cd): 0-0.4%, silicon carbide (SiC): 0.1-0.4%, iron (Fe): ≤0.15%, silicon (Si): ≤0.06%, magnesium (Mg): ≤0.05%, zinc (Zn): ≤0.1%, other individual impurity elements: ≤0.05%, total other impurity elements: ≤0.15%, and the balance is aluminum (Al).

[0008] A high-temperature resistant aluminum alloy wire suitable for additive manufacturing of arc fuse wires has the following composition by mass percentage: manganese (Mn): 0.3-0.5%, copper (Cu): 5.3-5.8%, titanium (Ti): 0.15-0.25%, boron (B): 0.001-0.004%, vanadium (V): 0.05-0.2%, zirconium (Zr): 0.1-0.2%, cadmium (Cd): 0-0.3%, silicon carbide (SiC): 0.1-0.2%, iron (Fe): ≤0.15%, silicon (Si): ≤0.06%, magnesium (Mg): ≤0.05%, zinc (Zn): ≤0.03%, other individual impurity elements: ≤0.05%, total other impurity elements: ≤0.15%, and the balance is aluminum (Al).

[0009] A high-temperature resistant aluminum alloy wire suitable for additive manufacturing of arc fuse wires has the following composition by mass percentage: manganese (Mn): 0.35-0.45%, copper (Cu): 5.5-5.7%, titanium (Ti): 0.15-0.2%, boron (B): 0.002-0.003%, vanadium (V): 0.1-0.15%, zirconium (Zr): 0.1-0.15%, cadmium (Cd): 0-0.25%, silicon carbide (SiC): 0.15%, iron (Fe): ≤0.15%, silicon (Si): ≤0.05%, magnesium (Mg): ≤0.04%, zinc (Zn): ≤0.02%, other individual impurity elements: ≤0.05%, total other impurity elements: ≤0.15%, and the balance is aluminum (Al).

[0010] A high-temperature resistant aluminum alloy wire suitable for additive manufacturing of arc fuse wires has the following composition by mass percentage: manganese (Mn): 0.38%, copper (Cu): 5.65%, titanium (Ti): 0.19%, boron (B): 0.0027%, vanadium (V): 0.11%, zirconium (Zr): 0.15%, silicon carbide (SiC): 0.15%, iron (Fe): 0.10%, silicon (Si): 0.038%, magnesium (Mg): 0.0024%, zinc (Zn): 0.014%, with the balance being aluminum (Al).

[0011] A high-temperature resistant aluminum alloy wire suitable for additive manufacturing of arc fuses has the following composition by mass percentage: manganese (Mn): 0.43%, copper (Cu): 5.58%, titanium (Ti): 0.17%, boron (B): 0.0024%, vanadium (V): 0.1%, zirconium (Zr): 0.14%, cadmium (Cd): 0.21%, silicon carbide (SiC): 0.15%, iron (Fe): 0.12%, silicon (Si): 0.044%, magnesium (Mg): 0.0032%, zinc (Zn): 0.015%, with the balance being aluminum (Al).

[0012] The silicon carbide (SiC) described in this invention is magnetic silicon carbide (SiC) micro powder with a particle size of 1-3 micrometers, which can be purchased commercially.

[0013] The present invention also provides a method for preparing high-temperature resistant aluminum alloy wire suitable for arc-fused-wire additive manufacturing, comprising the following steps:

[0014] (1) The raw materials are proportioned according to the formula. Except for silicon carbide (SiC), the other raw materials are smelted and alloyed in an electromagnetic induction furnace to form a melt.

[0015] (2) After the alloy melting is completed, silicon carbide (SiC) is added to the melt and dispersed into the melt by electromagnetic stirring of the electromagnetic induction furnace.

[0016] (3) The melt of dispersed silicon carbide (SiC) obtained in step (2) is transferred into a casting furnace, and wire rods with a diameter of 9-12 mm are prepared by continuous casting and extrusion under inert gas protection and electromagnetic stirring.

[0017] (4) Finished wire materials are obtained through forging, drawing, rolling, scraping and packaging processes.

[0018] Preferably, in step (1), the voltage for melting and alloying in an electromagnetic induction furnace is 400-800V and the time is 100-150min.

[0019] Preferably, in step (2), silicon carbide (SiC) is wrapped in aluminum foil and pressed into the melt. This method can improve the yield of SiC and make the amount added controllable.

[0020] Preferably, in step (2), during the dispersion of silicon carbide (SiC), the electromagnetic stirring voltage is 40–60V and the dispersion time is 20–30min.

[0021] In step (3), the inert gas can be a commonly used inert gas in the field, such as argon. During the S3 continuous casting and extrusion process for preparing wire rod, the pressure of the inert gas is 7-11 kPa. The argon pressure is automatically adjusted according to the weight of the melt in the casting furnace to ensure consistent casting speed. The adjustment method is a conventional method in the field, and the frequency of the electromagnetic stirring is 8-12 Hz.

[0022] The preparation methods described in this section, and other operational methods not described in detail, are all conventional operations in the field, such as using an electromagnetic induction furnace for melting, alloying, and obtaining finished wire materials through rotary forging, drawing, rolling, scraping, and packaging processes.

[0023] This invention also provides the application of the aluminum alloy wire described herein in the military or aerospace fields.

[0024] The present invention also provides the application of the aluminum alloy wire described herein in wire additive manufacturing.

[0025] The present invention relates to heat-resistant aluminum alloy wires suitable for additive manufacturing using arc-fused wires. The magnetic SiC micropowder used in this invention can be well distributed in the melt under electromagnetic stirring, exhibiting excellent wetting properties with the aluminum matrix. During the arc-fused wire additive manufacturing process, the magnetic SiC micropowder melts with the wire and enters the aggregate, becoming embedded in the aluminum matrix. When the alloy is subjected to load, the SiC micropowder can hinder the slippage of grain boundaries and dislocations, improving the alloy's strength. During high-temperature processes, the SiC micropowder remains unchanged, maintaining its strengthening effect, thus significantly improving the high-temperature performance of the alloy. Compared to existing technologies, the beneficial effects of this invention are:

[0026] The heat-resistant aluminum alloy wire suitable for arc additive manufacturing described in this invention has a smooth processing flow, fine wire grains, uniform structure, stable arc during arc additive manufacturing, and good processability.

[0027] The method for preparing the filament of this invention utilizes electromagnetic stirring to uniformly distribute magnetic SiC micropowder within the filament, avoiding the agglomeration problem of ceramic micropowder caused by traditional production methods and enabling industrial application. During additive manufacturing, the filament melts and forms an aggregate. Al₂Cu and Al₂O₃ are formed with alloying elements such as Cu, Mn, Ti, and Zr. 12The reinforcing phases, such as Mn2Cu, Al3Ti, and Al3Zr, collectively improve the room-temperature mechanical properties of the material, and these properties remain unchanged after high-temperature processes, significantly enhancing the material's high-temperature performance. Currently, the Al-Cu alloy prepared by this invention exhibits a tensile strength exceeding 400 MPa after holding at 200°C for 30 minutes, making it the best-performing arc-fused wire additive manufacturing aluminum alloy material reported to date (at 200°C for 30 minutes). Attached Figure Description

[0028] Figure 1 Microstructure of micronized Al-Cu alloy wire; (a) ZCL2319+SiC; (b) ZCL205C+SiC.

[0029] Figure 2 The microstructures of the direct-packed state of the micro-powder modified Al-Cu alloy packings are: (a) ZCL2319+SiC; (b) ZCL205C+SiC.

[0030] Figure 3 Microstructure of the T6 state of the micro-powder modified Al-Cu alloy packing material after holding at 200℃ for 30 min; (a) ZCL2319+SiC; (b) ZCL205C+SiC.

[0031] Figure 4 The distribution of strengthening phases in the T6 state of micronized Al-Cu alloy packings after holding at 200℃ for 30 min: (a) ZCL2319+SiC; (b) ZCL205C+SiC.

[0032] Figure 5 The morphology of SiC micropowder in the T6 state of Al-Cu alloy micropowder modified by micropowder after holding at 200℃ for 30 min: (a) ZCL2319+SiC; (b) ZCL205C+SiC. Detailed Implementation

[0033] The present invention will be further described below with reference to specific embodiments, but the present invention is not limited to this embodiment. Unless otherwise specified, the methods described in the present invention are conventional methods in the art, and the materials used are conventionally purchased unless otherwise specified.

[0034] The SiC micro powder used in the following examples has a particle size of 1-3 micrometers, is magnetic, and was purchased from Anshan Xinxin Additive Manufacturing Technology Co., Ltd., 012023004. Other SiC micro powder products with magnetic properties and a particle size of 1-3 micrometers can also achieve the same effect.

[0035] Example 1

[0036] This invention discloses a heat-resistant aluminum alloy wire suitable for additive manufacturing using electric arc fuses and its preparation method. The alloy composition, by mass percentage, is: manganese (Mn): 0.38, copper (Cu): 5.65, titanium (Ti): 0.19, boron (B): 0.0027, vanadium (V): 0.11, zirconium (Zr): 0.15, SiC micro powder: 0.15, iron (Fe): 0.10, silicon (Si): 0.038, magnesium (Mg): 0.0024, zinc (Zn): 0.014, with the balance being aluminum (Al).

[0037] Meanwhile, the SiC micro powder ratio was removed, serving as control 1.

[0038] The aluminum alloy wire described in this invention is melted and alloyed in an electromagnetic induction furnace for 130 minutes at an induction voltage of 600V. After melting, SiC is... p The micro powder was wrapped in aluminum foil and pressed into the melt to disperse it in the melt. The electromagnetic stirring voltage was 50V and the dispersion time was 25min (Control 1 did not have the dispersion step).

[0039] The melt is transferred to a casting furnace, where 11.5 mm diameter wire rods are produced using a continuous casting and extrusion process under argon protection and electromagnetic stirring. The argon pressure is 9 kPa, the electromagnetic stirring frequency is 10 Hz, and the wire rod exit speed is 2.5 m / min.

[0040] Finished wire materials are obtained through processes such as rotary forging, drawing, rolling, scraping, and packaging.

[0041] The aluminum alloy wire prepared in this embodiment has a tensile strength of 330 MPa and an elongation of 6.5%. The suitable physical properties of the wire ensure the stability of wire feeding during the additive manufacturing process.

[0042] The aluminum alloy wire prepared in this embodiment has fine grains and a uniform structure, and the magnetic SiC micropowder (black particles) is dispersed in the matrix, such as... Figure 1 As shown in (a), this internal structure ensures a smooth reduction machining process, with a wire yield of 95%. Based on the genetic effect of alloy structure, the good internal structure of the wire ensures a good internal structure for the additive manufacturing product.

[0043] Using the wire prepared in this embodiment as raw material, CMT (Continuous Metal-Mechanical Assembly) was performed at room temperature with a current of 124 A, a voltage of 13.2 V, a wire feed speed of 6.5 m / min, and a welding speed of 8 mm / s. The surface of the deposited body was bright, and the internal microstructure of the directly deposited state had a grain size of approximately 40 μm, with uniform size. The precipitated phases were uniformly dispersed at the grain boundaries, and magnetic SiC micropowder was dispersed in the matrix. Figure 2 As shown in (a). After a high-temperature process of holding at 200℃ for 30 min following the T6 state accumulation, the microstructure of the accumulation is as follows. Figure 3As shown in (a), all grains are equiaxed, with a size of approximately 40 μm, and the precipitated phase is dispersed diffusely at the grain boundaries. The morphology of the precipitated phase in the T6 state packing after holding at 200 °C for 30 min is as follows. Figure 4 As shown in (a), rod-shaped θ' phases are interspersed throughout the matrix, serving a reinforcing function. The morphology of SiC micropowder after holding the T6 state packing at 200℃ for 30 min is as follows. Figure 5 As shown in (a), SiC micropowder is embedded in the aluminum matrix without a clear interface between it and the matrix, thus acting as a grain boundary pinning agent. The mechanical properties after holding at 200℃ for 30 min are shown in Table 1. They are superior to the properties of the aluminum-copper alloy 2319 arc additive manufacturing deposit after holding at 200℃ for 30 min, and the mechanical properties are uniform in both the transverse and longitudinal directions.

[0044] Example 2

[0045] This invention discloses a heat-resistant aluminum alloy wire suitable for additive manufacturing using electric arc fuses and its preparation method. The alloy composition, by mass percentage, is as follows: manganese (Mn): 0.43, copper (Cu): 5.58, titanium (Ti): 0.17, boron (B): 0.0024, vanadium (V): 0.1, zirconium (Zr): 0.14, cadmium (Cd): 0.21, SiC micro powder: 0.15, iron (Fe): 0.12, silicon (Si): 0.044, magnesium (Mg): 0.0032, zinc (Zn): 0.015, with the balance being aluminum (Al).

[0046] Meanwhile, the SiC micro powder ratio was removed, serving as control 2.

[0047] The aluminum alloy wire of this invention is smelted and alloyed in an electromagnetic induction furnace for 130 minutes with an induction voltage of 650V. After smelting, magnetic SiC micro powder is wrapped in aluminum foil and pressed into the melt to disperse it in the melt. The electromagnetic stirring voltage is 50V and the dispersion time is 27 minutes (Control 2 does not have the dispersion step).

[0048] The melt is transferred to a casting furnace, where 11.5 mm diameter wire rods are produced using a continuous casting and extrusion process under argon protection and electromagnetic stirring. The argon pressure is 8 kPa, the electromagnetic stirring frequency is 10 Hz, and the wire rod exit speed is 2.6 m / min.

[0049] Finished wire materials are obtained through processes such as rotary forging, drawing, rolling, scraping, and packaging.

[0050] The aluminum alloy wire prepared in this embodiment has a tensile strength of 350 MPa and an elongation of 6.5%. The suitable physical properties of the wire ensure the stability of wire feeding during the additive manufacturing process.

[0051] The aluminum alloy wire prepared in this embodiment has fine grains and a uniform structure, and the magnetic SiC micropowder (black particles) is dispersed in the matrix, such as... Figure 1As shown in (b), this internal structure ensures a smooth reduction machining process, with a wire yield of 95%. Based on the genetic effect of alloy structure, the good internal structure of the wire ensures a good internal structure for the additive manufacturing product.

[0052] Using the wire prepared in this embodiment as raw material, CMT (Continuous Metal-Mechanical Assembly) was performed at room temperature with a current of 124 A, a voltage of 13.2 V, a wire feed speed of 6.5 m / min, and a welding speed of 8 mm / s. The surface of the deposited body was bright, and the internal microstructure of the directly deposited state had a grain size of approximately 40 μm, with uniform size. The precipitated phases were uniformly dispersed at the grain boundaries, and magnetic SiC micropowder was dispersed in the matrix. Figure 2 As shown in (b). After a high-temperature process of holding at 200℃ for 30 minutes, the microstructure of the T6 state accumulator is as follows. Figure 3 As shown in (b), all grains are equiaxed, with a size of approximately 40 μm. The morphology of the precipitated phases in the T6 state packing after holding at 200 °C for 30 min is as follows. Figure 4 As shown in (b), rod-shaped θ' phases are interspersed in the matrix, improving the alloy properties. The morphology of the SiC micropowder after holding the T6 state deposit at 200℃ for 30 min is as follows. Figure 5 As shown in (b), the SiC micropowder is embedded in the aluminum matrix without a clear interface between it and the matrix, thus acting as a anchor. The mechanical properties after holding at 200℃ for 30 min are shown in Table 1. They are superior to the performance of the aluminum-copper alloy ZCL205C arc additive manufacturing deposit after holding at 200℃ for 30 min, and the mechanical properties are uniform in both the transverse and longitudinal directions.

[0053] Table 1 Mechanical properties of micronized Al-Cu alloy packings after holding at 200℃ for 30 min

[0054] Brand Tensile strength / MPa Yield strength / MPa Elongation / % 2319 (i.e., reference 1) 316 264 13 2319+SiC (Example 1) 350 280 10 ZCL205C (i.e., Reference 2) 367 353 3.5 ZCL205C+SiC (Example 2) 410 380 3

Claims

1. A wire suitable for electric arc wire additive manufacturing of high temperature resistant aluminium alloy, characterized in that, The composition, by mass percentage, is as follows: Manganese (Mn): 0.3–0.5%, Copper (Cu): 5.3–5.8%, Titanium (Ti): 0.15–0.35%, Boron (B): 0.0005–0.006%, Vanadium (V): 0.05–0.3%, Zirconium (Zr): 0.05–0.2%, Cadmium (Cd): 0–0.3%, and magnetic silicon carbide (SiC) with a particle size of 1–3 micrometers. 0.1-0.4%, Iron (Fe): ≤0.15%, Silicon (Si): ≤0.06%, Magnesium (Mg): ≤0.05%, Zinc (Zn): ≤0.1%, Other individual impurity elements: ≤0.05%, Total other impurity elements: ≤0.15%, Balance is Aluminum (Al); The aluminum alloy wire is prepared by the following steps: (1) The raw materials are proportioned according to the formula. Except for the magnetic silicon carbide (SiC) micro powder, the other raw materials are smelted and alloyed in an electromagnetic induction furnace to form a melt. (2) After the alloy melting is completed, magnetic silicon carbide (SiC) micro powder is added to the melt. The magnetic silicon carbide (SiC) micro powder is dispersed into the melt by electromagnetic stirring of the electromagnetic induction furnace. (3) The melt of dispersed magnetic silicon carbide (SiC) micro powder obtained in step (2) is transferred into a casting furnace, and wire rods with a diameter of 9-12 mm are prepared by continuous casting and extrusion under inert gas protection and electromagnetic stirring. (4) Finished wire materials are obtained through rotary forging, drawing, rolling, scraping and packaging processes.

2. A high-temperature resistant aluminum alloy wire suitable for additive manufacturing using arc welding wire, characterized in that, The composition, by mass percentage, is as follows: Manganese (Mn): 0.3–0.5%, Copper (Cu): 5.3–5.8%, Titanium (Ti): 0.15–0.25%, Boron (B): 0.001–0.004%, Vanadium (V): 0.05–0.2%, Zirconium (Zr): 0.1–0.2%, Cadmium (Cd): 0–0.3%, Magnetic Silicon Carbide (SiC) Powder with a particle size of 1–3 micrometers: 0.1–0.2%, Iron (Fe): ≤0.15%, Silicon (Si): ≤0.06%, Magnesium (Mg): ≤0.05%, Zinc (Zn): ≤0.03%, Other individual impurity elements: ≤0.05%, Total other impurity elements: ≤0.15%, Balance: Aluminum (Al); The aluminum alloy wire is prepared by the following steps: (1) The raw materials are proportioned according to the formula. Except for the magnetic silicon carbide (SiC) micro powder, the other raw materials are smelted and alloyed in an electromagnetic induction furnace to form a melt. (2) After the alloy melting is completed, magnetic silicon carbide (SiC) micro powder is added to the melt. The magnetic silicon carbide (SiC) micro powder is dispersed into the melt by electromagnetic stirring of the electromagnetic induction furnace. (3) The melt of dispersed magnetic silicon carbide (SiC) micro powder obtained in step (2) is transferred into a casting furnace, and wire rods with a diameter of 9-12 mm are prepared by continuous casting and extrusion under inert gas protection and electromagnetic stirring. (4) Finished wire materials are obtained through rotary forging, drawing, rolling, scraping and packaging processes.

3. A high-temperature resistant aluminum alloy wire suitable for arc-fused-wire additive manufacturing, characterized in that, The composition, by mass percentage, is as follows: Manganese (Mn): 0.35–0.45%, Copper (Cu): 5.5–5.7%, Titanium (Ti): 0.15–0.2%, Boron (B): 0.002–0.003%, Vanadium (V): 0.1–0.15%, Zirconium (Zr): 0.1–0.15%, Cadmium (Cd): 0–0.25%, Magnetic Silicon Carbide (SiC) Powder with a particle size of 1–3 micrometers: 0.15%, Iron (Fe): ≤0.15%, Silicon (Si): ≤0.05%, Magnesium (Mg): ≤0.04%, Zinc (Zn): ≤0.02%, Other individual impurity elements: ≤0.05%, Total other impurity elements: ≤0.15%, Balance: Aluminum (Al); The aluminum alloy wire is prepared by the following steps: (1) The raw materials are proportioned according to the formula. Except for the magnetic silicon carbide (SiC) micro powder, the other raw materials are smelted and alloyed in an electromagnetic induction furnace to form a melt. (2) After the alloy melting is completed, magnetic silicon carbide (SiC) micro powder is added to the melt. The magnetic silicon carbide (SiC) micro powder is dispersed into the melt by electromagnetic stirring of the electromagnetic induction furnace. (3) The melt of dispersed magnetic silicon carbide (SiC) micro powder obtained in step (2) is transferred into a casting furnace, and wire rods with a diameter of 9-12 mm are prepared by continuous casting and extrusion under inert gas protection and electromagnetic stirring. (4) Finished wire materials are obtained through rotary forging, drawing, rolling, scraping and packaging processes.

4. A high-temperature resistant aluminum alloy wire suitable for additive manufacturing with arc welding, characterized in that, The composition, by mass percentage, is: manganese (Mn): 0.38%, copper (Cu): 5.65%, titanium (Ti): 0.19%, boron (B): 0.0027%, vanadium (V): 0.11%, zirconium (Zr): 0.15%, and magnetic silicon carbide (SiC) micropowder with a particle size of 1–3 micrometers. 0.15% iron (Fe), 0.10% silicon (Si), 0.038% magnesium (Mg), 0.0024% zinc (Zn), with the balance being aluminum (Al); the aluminum alloy wire is prepared by the following steps: (1) The raw materials are proportioned according to the formula. Except for the magnetic silicon carbide (SiC) micro powder, the other raw materials are smelted and alloyed in an electromagnetic induction furnace to form a melt. (2) After the alloy melting is completed, magnetic silicon carbide (SiC) micro powder is added to the melt. The magnetic silicon carbide (SiC) micro powder is dispersed into the melt by electromagnetic stirring of the electromagnetic induction furnace. (3) The melt of dispersed magnetic silicon carbide (SiC) micro powder obtained in step (2) is transferred into a casting furnace, and wire rods with a diameter of 9-12 mm are prepared by continuous casting and extrusion under inert gas protection and electromagnetic stirring. (4) Finished wire materials are obtained through rotary forging, drawing, rolling, scraping and packaging processes.

5. A high-temperature resistant aluminum alloy wire suitable for additive manufacturing with arc welding, characterized in that, The composition, by mass percentage, is as follows: Manganese (Mn): 0.43%, Copper (Cu): 5.58%, Titanium (Ti): 0.17%, Boron (B): 0.0024%, Vanadium (V): 0.1%, Zirconium (Zr): 0.14%, Cadmium (Cd): 0.21%, Magnetic Silicon Carbide (SiC) micropowder with a particle size of 1–3 micrometers: 0.15%, Iron (Fe): 0.12%, Silicon (Si): 0.044%, Magnesium (Mg): 0.0032%, Zinc (Zn): 0.015%, with the balance being Aluminum (Al). The aluminum alloy wire is prepared through the following steps: (1) The raw materials are proportioned according to the formula. Except for the magnetic silicon carbide (SiC) micro powder, the other raw materials are smelted and alloyed in an electromagnetic induction furnace to form a melt. (2) After the alloy melting is completed, magnetic silicon carbide (SiC) micro powder is added to the melt. The magnetic silicon carbide (SiC) micro powder is dispersed into the melt by electromagnetic stirring of the electromagnetic induction furnace. (3) The melt of dispersed magnetic silicon carbide (SiC) micro powder obtained in step (2) is transferred into a casting furnace, and wire rods with a diameter of 9-12 mm are prepared by continuous casting and extrusion under inert gas protection and electromagnetic stirring. (4) Finished wire materials are obtained through rotary forging, drawing, rolling, scraping and packaging processes.

6. The high-temperature resistant aluminum alloy wire suitable for arc-fused-wire additive manufacturing according to any one of claims 1 to 5, characterized in that, In step (1), the voltage for melting and alloying in an electromagnetic induction furnace is 400-800V and the time is 100-150min.

7. The high-temperature resistant aluminum alloy wire suitable for arc-fused-wire additive manufacturing according to any one of claims 1 to 5, characterized in that, In step (2), magnetic silicon carbide (SiC) micro powder is wrapped in aluminum foil and pressed into the melt.

8. The high-temperature resistant aluminum alloy wire suitable for arc-fused-wire additive manufacturing according to any one of claims 1 to 5, characterized in that, In step (2), during the dispersion of magnetic silicon carbide (SiC) micro powder, the electromagnetic stirring voltage is 40-60V and the dispersion time is 20-30min.

9. The high-temperature resistant aluminum alloy wire suitable for arc-fused-wire additive manufacturing according to any one of claims 1 to 5, characterized in that, In step (3), the inert gas is argon; during the S3 continuous casting and extrusion process to prepare wire rod, the pressure of the inert protective gas is 7-11 kPa and the frequency of the electromagnetic stirring is 8-12 Hz.

10. The application of the aluminum alloy wire according to any one of claims 1 to 5 in the military or aerospace fields.

11. The application of the aluminum alloy wire according to any one of claims 1 to 5 in wire additive manufacturing.

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