A rare earth micro-alloyed Al-Fe-Si based multipurpose aluminum alloy wire and a preparation method thereof

Abstract

The application discloses a rare earth micro-alloyed Al-Fe-Si-based multipurpose aluminum alloy wire and a preparation method thereof, and relates to the technical field of metal material processing and manufacturing. The wire composition formula is Al-xFe-ySi-zRE-mCu-nMg-pZn, wherein 0.3<=x<=0.55, 0.15<=y<=0.3, 0.1<=z<=0.35, m<=0.2, n<=0.2, p<=0.2, and x>=y. The wire is prepared from pure aluminum and intermediate alloy or pure metal as raw materials through a 'cross deformation two-stage aging' and 'twisting-extruding-drawing composite cold deformation' process method matched with the alloy formula. The application can develop Al-Fe-Si-based aluminum alloy wires with different characteristics, which are respectively suitable for high-conductivity-high-strength, high-conductivity-high-plasticity and high-conductivity-high-strength-high-plasticity application scenarios.

Description

Technical Field

[0001] This invention relates to the field of metal material processing and manufacturing technology, and in particular to a rare earth microalloyed Al-Fe-Si based multipurpose aluminum alloy wire and its preparation method. Background Technology

[0002] Cables are a major application area for copper in my country. Compared to copper conductors, although aluminum has lower conductivity, the cross-sectional area of ​​industrial pure aluminum conductors should be set to approximately 1.64 times that of copper conductors for the same power transmission capacity. The accurate replacement cross-sectional area is mainly determined by conductivity. Although the volume per unit length of conductor also increases by about 1.64 times, the production cost of aluminum conductors is less than half that of copper conductors because aluminum's density and price are much lower than copper. Nevertheless, due to the lower strength of industrial pure aluminum, its stress resistance still lags behind that of copper conductors after increasing the cross-sectional area. Replacing industrial pure aluminum with aluminum alloy conductors can significantly improve conductor strength. Currently, the most widely used aluminum alloy conductors are 8xxx Al-Fe based aluminum alloys. The addition of iron not only improves conductor strength but, under appropriate addition conditions, also increases conductor conductivity.

[0003] However, the tensile strength of traditional 8xxx aluminum alloy conductors (soft state) is typically below 110 MPa, while their conductivity is usually around 61% IACS (IACS represents the international standard conductivity for annealed copper), and their elongation is generally below 15%. This makes them unsuitable for many applications requiring higher strength, ductility, and conductivity. In particular, the conductivity of traditional 8xxx aluminum alloy conductors is difficult to improve further. Yet, every 1% increase in conductivity can save a significant amount of electricity nationwide annually. Therefore, over the many years of cable service, this will result in substantial energy savings, equivalent to a significant reduction in carbon emissions. Thus, developing new aluminum alloy conductors to further improve their performance in all aspects is of great significance for expanding the applications of aluminum alloy conductors. Summary of the Invention

[0004] To address the above shortcomings, this invention provides a rare-earth microalloyed Al-Fe-Si based multi-purpose aluminum alloy wire and its preparation method. By optimizing the formula and combining a "two-stage aging across deformation" heat treatment with a "torsional extrusion-pulling composite cold deformation" forming control process, this invention develops Al-Fe-Si based aluminum alloy wires with different properties, suitable for applications requiring high conductivity-high strength, high conductivity-high ductility, and high conductivity-high strength-high ductility, respectively. The specific technical solutions are as follows:

[0005] A rare earth microalloyed Al-Fe-Si-based multi-purpose aluminum alloy wire, the nominal composition of the aluminum alloy wire is Al-xFe-ySi-zRE-mCu-nMg-pZn, and the coefficients x, y, z, m, n, p respectively represent the mass percentage contents of Fe, Si, RE, Cu, Mg, Zn in the aluminum alloy wire. Among them, 0.3 ≤ x ≤ 0.55, 0.15 < y ≤ 0.3, 0.1 ≤ z ≤ 0.35, m ≤ 0.2, n ≤ 0.2, p ≤ 0.2, and x ≥ y;

[0006] The formula of the present invention contains rare earth elements. During the refining process, rare earth elements can further reduce the content of impurity oxygen (O) in the aluminum alloy melt, thereby enhancing the plasticity of the aluminum alloy. At the same time, due to the slow diffusion rate of rare earth elements, once they form a coating on the precipitate phase, it will play a good stabilizing role, which is conducive to the dispersed distribution of the precipitate phase and can inhibit the change of alloy properties caused by natural aging of the wire over time;

[0007] Different from traditional 8xxx aluminum alloys (Si ≤ 0.15%), in the formula of the present invention, the Si content is set to 0.15 < Si ≤ 0.3. The higher Si content and the appropriate amount of rare earth elements cooperate with each other to obtain an aluminum alloy wire with excellent performance. Among them, rare earth microalloying can increase the proportion of Si in the Al-Fe-Si second-phase particles and the volume fraction of the dispersed phase, thereby enhancing the strength and plasticity of the aluminum alloy; rare earth microalloying also forms a coating on the Al-Fe-Si second phase, controls the grain size of the dispersed phase, inhibits the aggregation and abnormal growth of the second phase, is conducive to reducing the scattering effect of the second-phase particles on electrons, and increases the mean free path of electrons, so that the alloy can obtain higher electrical conductivity. At the same time, the presence of the Al-Fe-Si primary second phase plays a role in heterogeneous nucleation for rare earth elements, thereby reducing the solubility of rare earth elements in the alloy matrix. The damage of rare earth alloy elements in solid solution form to the electrical conductivity of the alloy is much higher than the damage of forming dispersed phases to the electrical conductivity of the alloy.

[0008] Preferably, the RE is Ce or Er. Ce or Er is only a preferred option, and RE is not limited to using other rare earth elements.

[0009] Preferably, the multi-purpose aluminum alloy wire is a high electrical conductivity-high strength wire, or a high electrical conductivity-high plasticity wire, or a high electrical conductivity-high strength-high plasticity wire;

[0010] The electrical conductivity of the high electrical conductivity-high strength wire is ≥ 62% IACS, and the tensile strength is ≥ 179 MPa, which is suitable for occasions with large vertical drops and large spans;

[0011] The electrical conductivity of the high electrical conductivity-high plasticity wire is ≥ 63% IACS, and the elongation is ≥ 32%, which is suitable for occasions such as underground laying and small bending radii;

[0012] The high conductivity-high strength-high plasticity conductor has a conductivity ≥62%IACS, a tensile strength ≥110MPa, and an elongation ≥13%, making it suitable for use as an aluminum alloy conductor for cables.

[0013] This invention also provides a method for preparing rare-earth microalloyed Al-Fe-Si based multipurpose aluminum alloy wires, comprising the following steps:

[0014] (1) Material preparation: According to the composition and dosage of the aluminum alloy wire as described in claim 1, pure aluminum is weighed as the aluminum alloy base material, and Fe, Si, RE, Cu, Mg aluminum-based intermediate alloy and pure Zn are weighed as alloying agents.

[0015] The pure aluminum grade is industrial pure aluminum or high-purity aluminum. The pure aluminum is not limited to liquid or solid, nor is it limited to aluminum ingots, aluminum materials or aluminum powder. The aluminum-based master alloy is a binary or multi-element alloy of Al-Fe, Al-Si, Al-RE, Al-Cu, Al-Mg, and Al-Zn with any proportion of alloying elements. The Al-Mg master alloy and pure Zn can be replaced by elemental Mg and Al-Zn master alloy.

[0016] (2) Smelting: Smelting the raw materials to obtain aluminum alloy melt.

[0017] (3) Refining: Add refining agent to the aluminum alloy melt for refining.

[0018] (4) Casting: The refined aluminum alloy melt is made into aluminum alloy cast rods.

[0019] (5) Solution treatment: The aluminum alloy casting rod is subjected to solution treatment to obtain the solution-treated aluminum alloy casting rod.

[0020] (6) First-level aging: After the solution-treated aluminum alloy casting rod is kept at 180-200℃ for 8-12 h, it is cooled to room temperature in the furnace to obtain an Al-Fe-Si based aluminum alloy guide rod with a certain dispersion phase structure.

[0021] The purpose of first-stage aging is to generate a dispersed phase with a suitable particle size. During subsequent cold deformation, these dispersed phases act as hard particles to shear and divide the aluminum matrix, which is beneficial for the formation of a large number of fine subgrains inside the relatively coarse primary grains.

[0022] (7) Torsional extrusion and pultrusion combined cold deformation: On a rolling mill, the Al-Fe-Si based aluminum alloy guide rod is extruded using a square hole roller. The guide rod with a circular cross section is extruded 6 to 10 times to obtain a square wire. Then, on a wire drawing machine, the square wire is sequentially drawn through round hole dies of different diameters in an orderly manner for 5 to 8 times to form a circular aluminum alloy wire, thus obtaining a hard aluminum alloy wire. Since the wire has not undergone further heat treatment, it is called a hard aluminum alloy wire.

[0023] During the extrusion process, the aluminum alloy guide rod is subjected not only to compressive stress perpendicular to the guide rod surface and tensile stress along the guide rod axis, but also to circumferential pushing stress. The combination of these two factors makes the material flow more complete, increasing the degree of deformation and dislocation density inside the alloy.

[0024] (8) Secondary aging: The hard aluminum alloy wire is artificially aged by heating to 240-260°C and holding at that temperature for 2-8 hours, followed by furnace cooling to obtain the aluminum alloy wire. The aluminum alloy wire is a soft rare earth aluminum alloy wire (Note: Unless otherwise specified in this invention, all aluminum alloy wires are soft).

[0025] The purpose of secondary aging is as follows: Due to the combined cold deformation of torsion and drawing, a large number of dislocations are formed inside the aluminum alloy. In addition, the nucleation effect induced by the dispersed phase formed by primary aging significantly reduces the secondary nucleation energy. Therefore, setting the temperature of secondary aging to be higher than that of primary aging can significantly reduce the solid solubility of alloying elements in the aluminum matrix, purify the matrix, and thus significantly improve the electrical conductivity of the aluminum alloy. At the same time, secondary aging also has an annealing effect, which can reduce the internal stress and defects of the conductor and significantly improve the plasticity of the conductor.

[0026] The aforementioned "two-stage aging process across cold deformation" can reduce the solid solubility of alloying elements and simultaneously form dispersed fine precipitates, thereby improving both the plasticity and strength of the alloy. Furthermore, the two-stage aging process further reduces the solid solubility of alloying elements and increases the volume fraction of dispersed phases, further purifying the matrix, enhancing the strengthening effect of the second phase, and possessing an annealing function. This allows the alloy grains to "recover," reducing internal defects and internal stress, thus improving the overall performance of the aluminum alloy.

[0027] Preferably, in step (2), the smelting involves placing the pure aluminum in a reaction vessel and heating it to 720-750°C and holding it thereafter. After all the pure aluminum has melted, intermediate alloys of Fe, Cu, RE, Si, and Mg, and pure Zn are added to the molten aluminum in sequence. Each alloy is stirred for 4-6 minutes after it is added. After all the intermediate alloys have been added, the mixture is allowed to stand for 5-10 minutes to obtain an aluminum alloy melt with a stable temperature.

[0028] Preferably, in step (3), the refining involves adding a refining agent to the aluminum alloy melt, stirring for 4 to 6 minutes, letting it stand for 5 to 10 minutes, removing the slag, and continuing to slowly stir for 3 to 5 minutes while maintaining the temperature at 720 to 750°C.

[0029] Preferably, the refining agent is hexachloroethane, and the amount of hexachloroethane added is 0.3 to 0.8 wt% of the total mass of the aluminum alloy melt.

[0030] Preferably, in step (4), the specific method of casting is as follows: the refined aluminum alloy melt is poured into a mold that has been preheated to 300-450°C and cooled naturally at room temperature to form an aluminum alloy casting rod.

[0031] Preferably, in step (5), the specific method of solution treatment is as follows: the aluminum alloy casting rod is placed in a muffle furnace and kept at a constant temperature of 500-520°C for 4-6 hours, and then quickly taken out of the furnace and naturally cooled to room temperature to obtain the solution-treated aluminum alloy casting rod.

[0032] Preferably, in step (7), the torsional pultrusion composite cold deformation is performed at room temperature; performing the operation at room temperature can not only improve the strength of the rare earth aluminum alloy wire, but also improve the surface quality of the aluminum alloy wire.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] 1. This invention, through optimized formulation and combined with "two-stage aging across deformation" heat treatment and "torsional extrusion-pulling composite cold deformation" forming control process, develops Al-Fe-Si based aluminum alloy wires with different properties, which are suitable for application scenarios of high conductivity-high strength, high conductivity-high plasticity, and high conductivity-high strength-high plasticity respectively.

[0035] 2. The equipment, process methods, and process parameters used in this invention are compatible with modern aluminum alloy industrial production technology. In principle, the "two-stage aging across deformation" heat treatment and "torsion extrusion-pulling composite cold deformation" forming control process developed in this invention are not only suitable for Al-Fe-Si based aluminum alloy wires, but may also be suitable for the preparation of alloys containing second-phase strengthening or dispersed phase strengthening, such as Al-Si based, Al-Cu based, and Al-RE based alloys.

[0036] 3. The method of the present invention has a short process flow, is easy to operate, has low preparation cost, is easy to industrialize, and the prepared alloy material is an aluminum alloy conductor with great application potential and has excellent application and promotion prospects. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0038] Figure 1 This is a flow chart of the rare earth microalloyed Al-Fe-Si based aluminum alloy wire preparation process of the present invention;

[0039] Figure 2 This is a schematic diagram illustrating the effect of rare earth microalloying in this invention;

[0040] Figure 3 This is a schematic diagram showing the contour change of the sample (from the guide rod to the wire) during the "torsional pultrusion composite cold deformation" process of the present invention;

[0041] Figure 4 The image shows a field emission scanning electron microscope (FEM) image of the cross-section of the high-conductivity aluminum alloy as-cast conductor and the final conductor in Embodiment 1 of the present invention.

[0042] Figure 5 This is a comparison chart of the conductivity, tensile strength, and elongation of the high conductivity-high plasticity conductors prepared in Examples 1 to 5 of this invention with the standard values ​​recommended by the national standard (GB / T 30552-2014) for aluminum alloy wires for cable conductors;

[0043] Figure 6 This is a comparison chart of the conductivity, tensile strength, and elongation of the high conductivity-high strength conductors prepared in Examples 6-9 of this invention with the standard values ​​recommended by the national standard (GB / T 30552-2014) for aluminum alloy wires for cable conductors;

[0044] Figure 7 This is a comparison chart of the conductivity, tensile strength, and elongation of the high conductivity-high strength-high plasticity conductors prepared in Examples 10-12 of this invention with the standard values ​​recommended by the national standard (GB / T 30552-2014) for aluminum alloy wires used in cable conductors. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0046] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0047] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, and / or combinations thereof.

[0048] Example 1:

[0049] The raw materials are prepared according to the mass percentages of the Al-0.3Fe-0.3Si-0.2Ce-0.1Cu-0.05Mg-0.05Zn aluminum alloy formulation. This example illustrates that, under suitable formulation and preparation process conditions, aluminum alloy wires that meet both high conductivity and high ductility requirements can be prepared. The preparation steps of this wire are as follows:

[0050] (1) Weighing

[0051] Weigh out the following components according to the mass ratio: 139.125 g of high-purity aluminum, 4.500 g of Al-10Fe master alloy, 2.250 g of Al-20Si master alloy, 3.000 g of Al-10Ce master alloy, 0.300 g of Al-50Cu master alloy, 0.750 g of Al-10Mg master alloy, 0.075 g of pure Zn, and 0.750 g of refining agent hexachloroethane.

[0052] (2) Smelting

[0053] The pure aluminum from step (1) is placed in a reaction vessel and heated to 750°C and kept at that temperature. After the aluminum ingot is completely melted, intermediate alloys of Fe, Cu, Ce, Si, and Mg and pure Zn are added to the aluminum melt in sequence. After each alloy is added, the mixture is stirred for 5 minutes. After all the intermediate alloys are added, the mixture is allowed to stand for 5 minutes to keep the temperature of the aluminum alloy melt stable.

[0054] (3) Refining

[0055] Wrap the hexachloroethane from step (1) in aluminum foil and press it into the bottom of the reaction vessel. Stir for 5 minutes, let it stand for 5 minutes, then remove the slag. Continue to heat at 750℃ while stirring slowly. Cast after 3 minutes.

[0056] (4) Casting

[0057] The rare earth aluminum alloy melt obtained in step (3) is poured into a mold that has been preheated to 400°C and allowed to cool naturally at room temperature to form an aluminum alloy casting rod.

[0058] (5) Solution treatment

[0059] The aluminum alloy casting rod obtained in step (4) is placed in a muffle furnace and kept at a constant temperature within a temperature range of 520℃ for 4 hours. It is then quickly removed from the furnace and allowed to cool naturally to room temperature to obtain the solution-treated aluminum alloy casting rod.

[0060] (6) Level 1 Timeliness Processing

[0061] The aluminum alloy cast rod obtained in step (5) after homogenization heat treatment was placed in a muffle furnace and kept at a constant temperature of 180℃ for 12 h. Then it was cooled to room temperature with the furnace to obtain an Al-Fe-Si based aluminum alloy guide rod with a certain dispersed phase.

[0062] (7) Torsional pultrusion combined cold deformation

[0063] On a rolling mill, the aluminum alloy guide rod obtained in step (6) is extruded using a square-hole roller. The guide rod with a circular cross-section is twisted and extruded 8 times to obtain a square wire. Subsequently, on a wire drawing machine, the square wire is sequentially drawn through round-hole dies of different diameters. The drawing process generally involves 6 passes to form a circular aluminum alloy wire. Wires that have not undergone further heat treatment are called hard aluminum alloy wires.

[0064] (8) Secondary time-sensitive processing

[0065] The aluminum alloy wire obtained in step (7) was subjected to secondary aging in a muffle furnace at a temperature of 260°C for 8 h. After cooling in the furnace, a rare earth aluminum alloy wire was prepared. This wire is a soft rare earth aluminum alloy wire.

[0066] Field emission scanning electron microscope (FESEM) images of the cross-sections of the high-conductivity aluminum alloy as-cast conductor and the final conductor in this embodiment are shown below. Figure 4 As shown, where, Figure 4 (a) shows that the precipitated phase in the untreated (as-cast) guide rod accumulates at the grain boundaries, making the grain boundaries coarser; Figure 4 (b) shows that the precipitated phase in the aluminum alloy wire prepared after solution treatment, first-stage aging, cold deformation and second-stage aging becomes very fine and is in a dispersed distribution state; Figure 4 (c) Shows elongated precipitated phases within the guide rod (cast state); while Figure 4 (d) shows that the precipitated phase in the conductor is relatively fine, changing from a long strip shape to a near equiaxed shape, and the grain boundaries are significantly refined to the point that they are difficult to distinguish. The refined grain boundaries are an important factor in improving the conductivity. Overall, this figure reflects that the new process developed in this invention has a significant refining and dispersion effect on the coarse second phase aggregated at the grain boundaries.

[0067] Example 2:

[0068] The raw materials are prepared according to the mass percentages of the Al-0.4Fe-0.2Si-0.2Ce-0.1Cu-0.05Mg-0.05Zn aluminum alloy formulation. This example illustrates that, under suitable formulation and preparation process conditions, aluminum alloy wires that meet both high conductivity and high ductility requirements can be prepared. The preparation steps of this wire are as follows:

[0069] (1) Weighing

[0070] Weigh out the following components according to the mass ratio: 138.375 g of high-purity aluminum, 6.000 g of Al-10Fe master alloy, 1.500 g of Al-20Si master alloy, 3.000 g of Al-10Ce master alloy, 0.300 g of Al-50Cu master alloy, 0.750 g of Al-10Mg master alloy, 0.075 g of pure Zn, and 0.750 g of refining agent hexachloroethane.

[0071] (2) Smelting

[0072] The pure aluminum from step (1) is placed in a reaction vessel and heated to 740°C and kept at that temperature. After the aluminum ingot is completely melted, intermediate alloys of Fe, Cu, Ce, Si, and Mg and pure Zn are added to the molten aluminum in sequence. After each alloy is added, the mixture is stirred for 4 minutes. After all the intermediate alloys are added, the mixture is allowed to stand for 10 minutes to keep the temperature of the aluminum alloy melt stable.

[0073] (3) Refining

[0074] Wrap the hexachloroethane from step (1) in aluminum foil and press it into the bottom of the reaction vessel. Stir for 4 minutes, let it stand for 10 minutes, then remove the slag. Continue to heat at 740℃ while stirring slowly. Cast after 5 minutes.

[0075] (4) Casting

[0076] The rare earth aluminum alloy melt obtained in step (3) is poured into a mold that has been preheated to 300°C and allowed to cool naturally at room temperature to form an aluminum alloy casting rod.

[0077] (5) Solution treatment

[0078] The aluminum alloy casting rod obtained in step (4) is placed in a muffle furnace and kept at a constant temperature within a temperature range of 520℃ for 4 hours. It is then quickly removed from the furnace and allowed to cool naturally to room temperature to obtain the solution-treated aluminum alloy casting rod.

[0079] (6) Level 1 Timeliness Processing

[0080] The aluminum alloy casting rod obtained in step (5) after homogenization heat treatment was placed in a muffle furnace and kept at a constant temperature of 200℃ for 8 hours. Then, it was cooled to room temperature with the furnace to obtain an Al-Fe-Si based aluminum alloy guide rod with a certain dispersed phase.

[0081] (7) Torsional pultrusion combined cold deformation

[0082] On a rolling mill, the aluminum alloy guide rod obtained in step (6) is extruded using a square-hole roller. The guide rod with a circular cross-section is twisted and extruded 6 times to obtain a square wire. Subsequently, on a wire drawing machine, the square wire is sequentially drawn through round-hole dies of different diameters. The wire drawing process generally involves 8 passes to form a circular aluminum alloy wire. Wires that have not undergone further heat treatment are called hard aluminum alloy wires.

[0083] (8) Secondary time-sensitive processing

[0084] The aluminum alloy wire obtained in step (7) was subjected to secondary aging in a muffle furnace at a temperature of 260°C for 8 h. After cooling in the furnace, a rare earth aluminum alloy wire was prepared. This wire is a soft rare earth aluminum alloy wire.

[0085] Example 3:

[0086] The raw materials are prepared according to the mass percentages of the Al-0.55Fe-0.16Si-0.2Ce-0.1Cu-0.05Mg-0.05Zn aluminum alloy formulation. This example illustrates that, under suitable formulation and preparation process conditions, aluminum alloy wires that meet both high conductivity and high ductility requirements can be prepared. The preparation steps of this wire are as follows:

[0087] (1) Weighing

[0088] Weigh out the following components according to the mass ratio: 137.760 g of industrial pure aluminum, 7.290 g of Al-10Fe master alloy, 0.825 g of Al-20Si master alloy, 3.000 g of Al-10Ce master alloy, 0.300 g of Al-50Cu master alloy, 0.750 g of Al-10Mg master alloy, 0.075 g of pure Zn, and 0.750 g of refining agent hexachloroethane.

[0089] (2) Smelting

[0090] The pure aluminum from step (1) is placed in a reaction vessel and heated to 750°C and kept at that temperature. After the aluminum ingot is completely melted, intermediate alloys of Fe, Cu, Ce, Si, and Mg and pure Zn are added to the aluminum melt in sequence. After each alloy is added, the mixture is stirred for 6 minutes. After all the intermediate alloys are added, the mixture is allowed to stand for 5 minutes to keep the temperature of the aluminum alloy melt stable.

[0091] (3) Refining

[0092] Wrap the hexachloroethane from step (1) in aluminum foil and press it into the bottom of the reaction vessel. Stir for 6 minutes, let it stand for 5 minutes, then remove the slag. Continue to heat at 750℃ while stirring slowly. Cast after 3 minutes.

[0093] (4) Casting

[0094] The rare earth aluminum alloy melt obtained in step (3) is poured into a mold that has been preheated to 450°C and allowed to cool naturally at room temperature to form an aluminum alloy casting rod.

[0095] (5) Solution treatment

[0096] The aluminum alloy casting rod obtained in step (4) is placed in a muffle furnace and kept at a constant temperature within a temperature range of 500℃ for 6 hours. It is then quickly removed from the furnace and allowed to cool naturally to room temperature to obtain the solution-treated aluminum alloy casting rod.

[0097] (6) Level 1 Timeliness Processing

[0098] The aluminum alloy cast rod obtained in step (5) after homogenization heat treatment was placed in a muffle furnace and kept at a constant temperature of 180℃ for 12 h. Then it was cooled to room temperature with the furnace to obtain an Al-Fe-Si based aluminum alloy guide rod with a certain dispersed phase.

[0099] (7) Torsional pultrusion combined cold deformation

[0100] On a rolling mill, the aluminum alloy guide rod obtained in step (6) is extruded using a square-hole roller. The guide rod with a circular cross-section is twisted and extruded 10 times to obtain a square wire. Subsequently, on a wire drawing machine, the square wire is sequentially drawn through round-hole dies of different diameters. The drawing process generally involves 5 passes to form a circular aluminum alloy wire. Wires that have not undergone further heat treatment are called hard aluminum alloy wires.

[0101] (8) Secondary time-sensitive processing

[0102] The aluminum alloy wire obtained in step (7) was subjected to secondary aging in a muffle furnace at a temperature of 260°C for 8 h. After cooling in the furnace, a rare earth aluminum alloy wire was prepared. This wire is a soft rare earth aluminum alloy wire.

[0103] Example 4:

[0104] The raw materials are prepared according to the mass percentages of the Al-0.3Fe-0.3Si-0.2Ce-0.1Cu-0.05Mg-0.05Zn aluminum alloy formulation. This example illustrates that, under suitable formulation and preparation process conditions, aluminum alloy wires that meet both high conductivity and high ductility requirements can be prepared. The preparation steps of this wire are as follows:

[0105] (1) Weighing

[0106] Weigh out the following components according to the mass ratio: 139.125 g of high-purity aluminum, 4.500 g of Al-10Fe master alloy, 2.250 g of Al-20Si master alloy, 3.000 g of Al-10Ce master alloy, 0.300 g of Al-50Cu master alloy, 0.750 g of Al-10Mg master alloy, 0.075 g of pure Zn, and 0.450 g of refining agent hexachloroethane.

[0107] (2) Smelting

[0108] The pure aluminum from step (1) is placed in a reaction vessel and heated to 720°C and kept at that temperature. After the aluminum ingot is completely melted, intermediate alloys of Fe, Cu, Ce, Si, and Mg and pure Zn are added to the aluminum liquid in sequence. After each alloy is added, the mixture is stirred for 5 minutes. After all the intermediate alloys are added, the mixture is allowed to stand for 5 minutes to keep the temperature of the aluminum alloy melt stable.

[0109] (3) Refining

[0110] Wrap the hexachloroethane from step (1) in aluminum foil and press it into the bottom of the reaction vessel. Stir for 5 minutes, let it stand for 5 minutes, then remove the slag. Continue to heat at 720℃ while stirring slowly. Cast after 3 minutes.

[0111] (4) Casting

[0112] The rare earth aluminum alloy melt obtained in step (3) is poured into a mold that has been preheated to 400°C and allowed to cool naturally at room temperature to form an aluminum alloy casting rod.

[0113] The remaining steps are exactly the same as the process method and parameters in Example 1.

[0114] Example 5:

[0115] The raw materials are prepared according to the mass percentages of the Al-0.3Fe-0.3Si-0.2Ce-0.1Cu-0.05Mg-0.05Zn aluminum alloy formulation. This example illustrates that, under suitable formulation and preparation process conditions, aluminum alloy wires that meet both high conductivity and high ductility requirements can be prepared. The preparation steps of this wire are as follows:

[0116] (1) Weighing

[0117] Weigh out the following components according to the mass ratio: 139.125 g of high-purity aluminum, 4.500 g of Al-10Fe master alloy, 2.250 g of Al-20Si master alloy, 3.000 g of Al-10Ce master alloy, 0.300 g of Al-50Cu master alloy, 0.750 g of Al-10Mg master alloy, 0.075 g of pure Zn, and 1.200 g of refining agent hexachloroethane.

[0118] The remaining steps are exactly the same as the process method and parameters in Example 1.

[0119] A comparison of the conductivity, tensile strength, and elongation of the high conductivity-high plasticity conductors prepared in Examples 1-5 with the recommended standard values ​​in the national standard (GB / T 30552-2014) for aluminum alloy wires used in cable conductors. Figure 5 As shown in the figure, the dashed line represents the standard value. This figure illustrates that, except for the strength, which is slightly higher than the lower limit of the national standard recommended value, the electrical conductivity and plasticity of the samples prepared by Examples 1 to 5 are significantly higher than the national standard recommended values.

[0120] Example 6:

[0121] The raw materials are prepared according to the mass percentages of the Al-0.3Fe-0.3Si-0.1Ce-0.1Cu-0.05Mg-0.05Zn aluminum alloy formulation. This example illustrates that, under suitable formulation and preparation process conditions, aluminum alloy wires that meet both high electrical conductivity and high tensile strength requirements can be prepared. The preparation steps of this wire are as follows:

[0122] (1) Weighing

[0123] Weigh out the following components according to the mass ratio: 140.625 g of high-purity aluminum, 4.500 g of Al-10Fe master alloy, 2.250 g of Al-20Si master alloy, 1.500 g of Al-10Ce master alloy, 0.300 g of Al-50Cu master alloy, 0.750 g of Al-10Mg master alloy, 0.075 g of pure Zn, and 0.750 g of refining agent hexachloroethane.

[0124] The process methods and parameters for steps (2) to (7) of smelting, refining, casting, solution treatment, first-level aging treatment, and torsional extrusion composite cold deformation are exactly the same as those in Example (1).

[0125] (8) Secondary time-sensitive processing

[0126] The aluminum alloy wire obtained in step (7) was subjected to secondary aging in a muffle furnace at a temperature of 220°C for 4 h. After cooling in the furnace, a rare earth aluminum alloy wire was prepared. This wire is a soft rare earth aluminum alloy wire.

[0127] Example 7:

[0128] The raw materials are prepared according to the mass percentages of the Al-0.3Fe-0.3Si-0.35Er-0.1Cu-0.05Mg-0.05Zn aluminum alloy formulation. This example illustrates that, under suitable formulation and preparation process conditions, aluminum alloy wires that meet both high electrical conductivity and high tensile strength requirements can be prepared. The preparation steps of this wire are as follows:

[0129] (1) Weighing

[0130] Weigh out the following components according to the mass ratio: 136.700 g of high-purity aluminum, 4.500 g of Al-10Fe master alloy, 2.250 g of Al-20Si master alloy, 5.250 g of Al-10Er master alloy, 0.300 g of Al-50Cu master alloy, 0.750 g of Al-10Mg master alloy, 0.250 g of Al-30Zn master alloy, and 0.750 g of refining agent hexachloroethane.

[0131] (2)-(5) The process methods and parameters for smelting, refining, casting and solution treatment are exactly the same as those in Example (1).

[0132] (6) Level 1 Timeliness Processing

[0133] The aluminum alloy cast rod obtained in step (5) after homogenization heat treatment was placed in a muffle furnace and kept at a constant temperature of 200℃ for 10 h. Then it was cooled to room temperature with the furnace to obtain an Al-Fe-Si based aluminum alloy guide rod with a certain dispersion phase.

[0134] (7) Torsional pultrusion combined cold deformation

[0135] On a rolling mill, the aluminum alloy guide rod obtained in step (6) is extruded using a square-hole roller. The guide rod with a circular cross-section is twisted and extruded 8 times to obtain a square wire. Subsequently, on a wire drawing machine, the square wire is sequentially drawn through round-hole dies of different diameters. The wire drawing process generally involves 6 passes to produce a rare-earth aluminum alloy wire. Wires that have not undergone further heat treatment are called hard-state aluminum alloy wires.

[0136] (8) Secondary time-sensitive processing

[0137] The aluminum alloy wire obtained in step (7) was subjected to secondary aging in a muffle furnace at a temperature of 220°C for 6 h. After cooling in the furnace, a rare earth aluminum alloy wire was prepared. This wire is a soft rare earth aluminum alloy wire.

[0138] Example 8:

[0139] The raw materials are prepared according to the mass percentages of the Al-0.3Fe-0.2Si-0.15Ce-0.2Cu-0.05Mg-0.05Zn aluminum alloy formulation. This example illustrates that, under suitable formulation and preparation process conditions, aluminum alloy wires that meet both high electrical conductivity and high tensile strength requirements can be prepared. The preparation steps of this wire are as follows:

[0140] (1) Weighing

[0141] Weigh out the following components according to the mass ratio: 141.660 g of industrial pure aluminum, 3.540 g of Al-10Fe master alloy, 1.125 g of Al-20Si master alloy, 2.250 g of Al-10Ce master alloy, 0.600 g of Al-50Cu master alloy, 0.750 g of Al-10Mg master alloy, 0.075 g of pure Zn, and 0.750 g of refining agent hexachloroethane.

[0142] The process methods and parameters for smelting, refining and casting in steps (2) to (4) are exactly the same as those in Example 1.

[0143] (5) Solution treatment

[0144] The aluminum alloy casting rod obtained in step (4) is placed in a muffle furnace and kept at a constant temperature of 500°C for 6 hours. It is then quickly removed from the furnace and allowed to cool naturally to room temperature to obtain a solution-treated aluminum alloy casting rod.

[0145] Steps (6) and (7) are exactly the same as those in Example 1 for the process method and process parameters of first-level aging and torsional pultrusion composite cold deformation.

[0146] (8) Secondary time-sensitive processing

[0147] The aluminum alloy wire obtained in step (7) was subjected to secondary aging in a muffle furnace at a temperature of 220°C for 8 h. After cooling in the furnace, a rare earth aluminum alloy wire was prepared. This wire is a soft rare earth aluminum alloy wire.

[0148] Example 9:

[0149] The raw materials are prepared according to the mass percentages of the Al-0.3Fe-0.3Si-0.1Ce-0.1Cu-0.05Mg-0.05Zn aluminum alloy formulation. This example illustrates that, under suitable formulation and preparation process conditions, aluminum alloy wires that meet both high electrical conductivity and high tensile strength requirements can be prepared. The preparation steps of this wire are as follows:

[0150] (1) Weighing

[0151] Weigh out the following components according to the mass ratio: 141.960 g of industrial pure aluminum, 3.540 g of Al-10Fe master alloy, 1.875 g of Al-20Si master alloy, 1.500 g of Al-10Ce master alloy, 0.300 g of Al-50Cu master alloy, 0.750 g of Al-10Mg master alloy, 0.075 g of pure Zn, and 0.750 g of refining agent hexachloroethane.

[0152] The product obtained after the torsion extrusion composite cold deformation in step (7) of this embodiment was not subjected to secondary aging treatment, and the process methods and parameters of the remaining steps were exactly the same as those in Example 1.

[0153] Comparison of the conductivity, tensile strength, and elongation of the high conductivity-high strength conductors prepared in Examples 6-9 with the recommended standard values ​​of the national standard (GB / T 30552-2014) for aluminum alloy wires used in cable conductors. Figure 6 As shown in the figure, the dotted line represents the standard value. This figure illustrates that the aluminum alloy wires prepared by Examples 6 to 8, except for the plasticity index which does not meet the standard recommended value, have electrical conductivity and tensile strength indexes that are far higher than the lower limit of the standard recommended value, making them non-standard products.

[0154] Example 10:

[0155] The raw materials are prepared according to the mass percentages of the Al-0.3Fe-0.2Si-0.15Ce-0.1Cu-0.2Mg-0.05Zn aluminum alloy formulation. This example illustrates that, under suitable formulation and preparation process conditions, aluminum alloy wires that meet the requirements of high conductivity, high strength, and high ductility can be prepared. The preparation steps of this wire are as follows:

[0156] (1) Weighing

[0157] Weigh out the following components according to the mass ratio: 138.375 g of high-purity aluminum, 4.500 g of Al-10Fe master alloy, 1.500 g of Al-20Si master alloy, 2.250 g of Al-10Ce master alloy, 0.300 g of Al-50Cu master alloy, 3.000 g of Al-10Mg master alloy, 0.075 g of pure Zn, and 0.750 g of refining agent hexachloroethane.

[0158] (2)-(7) Except for the process parameters of the second-level aging in step (8) which are different from those in Example 1, the other process methods and steps are exactly the same as those in Example 1.

[0159] (8) Secondary time-sensitive processing

[0160] The aluminum alloy wire obtained in step (7) was subjected to secondary aging in a muffle furnace at a temperature of 260°C for 4 h. After cooling in the furnace, a rare earth aluminum alloy wire was prepared. This wire is a soft rare earth aluminum alloy wire.

[0161] Example 11:

[0162] The raw materials are prepared according to the mass percentages of the Al-0.3Fe-0.2Si-0.15Ce-0.1Cu-0.05Mg-0.2Zn aluminum alloy formulation. This example illustrates that, under suitable formulation and preparation process conditions, aluminum alloy wires that meet the requirements of high conductivity, high strength, and high ductility can be prepared. The preparation steps of this wire are as follows:

[0163] (1) Weighing

[0164] Weigh out the following components according to the mass ratio: 141.735 g of industrial pure aluminum, 3.540 g of Al-10Fe master alloy, 1.125 g of Al-20Si master alloy, 2.250 g of Al-10Ce master alloy, 0.300 g of Al-50Cu master alloy, 0.750 g of Al-10Mg master alloy, 0.300 g of pure Zn, and 0.750 g of refining agent hexachloroethane.

[0165] (2)-(7) Except for the process parameters of the second-level aging in step (8) which are different from those in Example 1, the other process methods and steps are exactly the same as those in Example 1.

[0166] (8) Secondary time-sensitive processing

[0167] The aluminum alloy wire obtained in step (7) was subjected to secondary aging in a muffle furnace at a temperature of 260°C for 2 h. After cooling in the furnace, a rare earth aluminum alloy wire was prepared. This wire is a soft rare earth aluminum alloy wire.

[0168] Example 12:

[0169] The raw materials are prepared according to the mass percentage of the Al-0.3Fe-0.3Si-0.2Ce-0.1Cu-0.05Mg-0.05Zn aluminum alloy formula: This example is used to illustrate that under suitable formula and preparation process conditions, aluminum alloy wires that meet the requirements of high conductivity, high strength and high plasticity can be prepared.

[0170] Except for the secondary aging process parameters, the formulation, preparation process and parameters of this wire are exactly the same as those of Example 1.

[0171] (8) Secondary time-sensitive processing

[0172] The aluminum alloy wire obtained in step (7) was subjected to secondary aging in a muffle furnace at a temperature of 240°C for 8 h. After cooling in the furnace, a rare earth aluminum alloy wire was prepared. This wire is a soft rare earth aluminum alloy wire.

[0173] A comparison of the conductivity, tensile strength, and elongation of the high conductivity-high strength-high ductility conductors prepared in Examples 10-12 with the recommended standard values ​​in the national standard (GB / T 30552-2014) for aluminum alloy wires used in cable conductors. Figure 7 As shown in the figure, the dashed line represents the standard value. This figure illustrates that the aluminum alloy wires prepared by Examples 10-12 are generally significantly higher than the lower limit of the recommended standard in terms of conductivity, strength and plasticity. However, in terms of individual properties, the plasticity is not as good as that of Examples 1-5, and the strength is not as good as that of the samples prepared by Examples 6-8 (soft state comparison only).

[0174] Example description:

[0175] Note 1: Since aluminum alloy wires used in practice are generally required to be in a soft state, especially for aluminum alloy wires used in cables, all of them are in a soft state except for the wire prepared in Example 9, which is a hard aluminum alloy wire.

[0176] Note 2: The conductors prepared by Examples 1 to 5 above have the characteristics of high conductivity (≥62% IACS) and high plasticity (elongation ≥20%), but low tensile strength (≤105 MPa). These indicators meet the standard requirements of aluminum alloy wire for cable conductors (GB / T 30552-2014), and are suitable for applications with high requirements for conductivity and plasticity, such as cable laying scenarios with small bending radii.

[0177] Note 3: The conductors prepared in Examples 6 to 9 above exhibit high electrical conductivity (≥62% IACS), high tensile strength (≥140 MPa), and low plasticity (elongation <10%). The conductor prepared in Example 9 is a hard aluminum alloy conductor. These conductors are suitable for applications requiring high electrical conductivity, extremely high tensile strength, and low plasticity.

[0178] Note 4: The conductors prepared by Examples 10 to 12 above have good comprehensive performance, namely high electrical conductivity (≥62% IACS), high plasticity (elongation ≥13%), and high tensile strength (≥110MPa). These indicators all meet the standard requirements of aluminum alloy wire for cable conductors (GB / T 30552-2014).

[0179] Explanation 5: The "torsional-pulling composite cold deformation" involved in the above embodiments involves first extruding the aluminum alloy round guide rod to form a square cross-section wire, and then drawing it to form a round wire. During the transformation from round to square to round, the internal particles of the aluminum alloy guide rod undergo rheological changes in multiple directions. Under the same deformation amount, the aluminum alloy has a higher dislocation density and a lower nucleation energy, which is beneficial to improving the subsequent secondary aging effect. Furthermore, the "torsional" method used in this invention differs from ordinary torsional methods. Ordinary torsional methods apply an additional torque to the guide rod, causing it to enter the die hole in a rotating state, resulting in rotation and translation of the entire guide rod. However, this invention does not require applying this external torque to the guide rod. Instead, it relies on the difference between the original shape of the guide rod and the shape of the die hole when the guide rod passes through it, causing the guide rod to be subjected to axial and radial stresses as well as circumferential stresses. Under this circumferential stress, the guide rod naturally undergoes torsional deformation, thereby achieving a composite deformation of torsion and pulling. The profile change of the sample (from guide rod to wire) during the "torsional pultrusion composite cold deformation" process of this invention is as follows: Figure 3As shown in the figure, the change trend of the outer contour and cross-sectional area of ​​the prepared sample during cold deformation is reflected. This shows that during cold deformation, the particles in the sample not only flow along the axial direction to make the sample thinner and longer, but also move along the circumferential direction to make up for the gap caused by the shape difference between the mold hole and the sample, so that the internal structure of the sample will undergo a deeper degree of deformation.

[0180] The effects of rare earth microalloying in this invention are shown in the figure. Figure 2 The figure illustrates the stabilizing and dispersing effect of rare earth microalloying on the Al-Fe-Si second phase. Of course, this effect requires a specific process that matches the alloy composition formulation to achieve.

[0181] To facilitate a clearer understanding of the formulations of rare-earth microalloyed Al-Fe-Si based aluminum alloys, they are summarized in Table 1.

[0182] Table 1. Composition formula (g) of rare earth microalloyed aluminum alloy wires in the examples.

[0183]

[0184] Note: In Table 1, the Fe and Si contents in industrial pure aluminum are 0.064wt% and 0.05wt%, respectively. The contents of other elements are very low. Therefore, only the Fe and Si elements in the raw materials were considered and compensated for when the raw materials were prepared, while the other elements were prepared according to the stoichiometry of the alloy.

[0185] To demonstrate the main mechanical properties and electrical conductivity of the aluminum alloys prepared in the examples, they are listed in Table 2, as shown below:

[0186] Table 2. Performance test data of rare earth microalloyed aluminum alloy wires at room temperature (20℃)

[0187]

[0188]

[0189] Comprehensive analysis reveals that the rare-earth microalloyed Al-Fe-Si based aluminum alloy conductor prepared by this invention, within the scope of the patent protection, can produce a novel and practical high-conductivity aluminum alloy conductor material with better conductivity than 6xxx series aluminum alloys, better mechanical properties than 1xxx series aluminum alloys, and better comprehensive performance than 8xxx series aluminum alloys by selecting appropriate alloy formulations, processes, and parameters. It has great potential in high-precision fields such as wires and cables and electrical equipment.

[0190] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A method of producing a rare earth microalloyed Al-Fe-Si based multipurpose aluminum alloy wire, characterized in that, The nominal composition of the multipurpose aluminum alloy wire is Al-xFe-ySi-zRE-mCu-nMg-pZn, and coefficients x, y, z, m, n, and p respectively represent the mass percentage of Fe, Si, RE, Cu, Mg, and Zn in the aluminum alloy wire, wherein 0.3≤x≤0.55, 0.15 The preparation method of the rare earth micro-alloyed Al-Fe-Si-based multipurpose aluminum alloy wire comprises the following steps: (1) material preparation: according to the composition and amount of the aluminum alloy wire, pure aluminum is weighed as the aluminum alloy base material, and Fe, Si, RE, Cu, Mg aluminum-based intermediate alloy and pure Zn are weighed as alloying agents; (2) melting: the raw materials are melted to obtain an aluminum alloy melt; (3) refining: a refining agent is added to the aluminum alloy melt for refining; (4) casting: the refined aluminum alloy melt is made into an aluminum alloy casting rod; (5) solid solution treatment: the aluminum alloy casting rod is subjected to solid solution treatment to obtain a solid-solution-treated aluminum alloy casting rod; (6) primary aging: the solid-solution-treated aluminum alloy casting rod is kept at 180-200℃ for 8-12 h, and then cooled to room temperature in the furnace to obtain an Al-Fe-Si-based aluminum alloy guide rod with a certain dispersion phase structure; (7) torsion-extrusion and drawing composite cold deformation: on a twisting machine, the Al-Fe-Si-based aluminum alloy guide rod is extruded using square hole rollers, and the round-section guide rod is extruded for 6-10 passes to obtain a square wire, which is then sequentially and orderly drawn through different diameter round hole dies on a drawing machine, and drawn for 5-8 passes. The square guide rod is subjected to axial, radial and circumferential stresses during drawing, and naturally deforms by torsion under the circumferential stress, gradually changing from square to round, and finally drawn into a round aluminum alloy wire to obtain a hard aluminum alloy wire; (8) secondary aging: the hard aluminum alloy wire is subjected to artificial aging, heated to 240-260℃, kept at constant temperature for 2-8 h, and then cooled in the furnace to obtain the multipurpose aluminum alloy wire.

2. A method of producing a rare earth microalloyed Al-Fe-Si based multipurpose aluminum alloy wire according to claim 1, characterized in that, The RE is Ce or Er.

3. A method of producing a rare earth microalloyed Al-Fe-Si based multipurpose aluminum alloy wire according to claim 1, characterized in that, In step (2), the specific method of melting is as follows: the pure aluminum is placed in a reaction container and heated to 720-750℃, and after the pure aluminum is completely melted, the intermediate alloys of Fe, Cu, RE, Si, Mg and pure Zn are sequentially added to the aluminum liquid, each alloy is stirred for 4-6 min after being added, and after all the intermediate alloys are added, the aluminum alloy melt with stable temperature is obtained after standing for 5-10 min.

4. The method of claim 1, wherein the method of producing a rare earth microalloyed Al-Fe-Si based multipurpose aluminum alloy wire is characterized by, In step (3), the specific method of refining is as follows: a refining agent is added to the aluminum alloy melt, stirred for 4-6 min, and then stood for 5-10 min, and the slag is removed, and then slowly stirred for 3-5 min while keeping the temperature at 720-750℃.

5. The method of claim 1, wherein the method of producing a rare earth microalloyed Al-Fe-Si based multipurpose aluminum alloy wire is characterized by, The refining agent is hexachloroethane, and the addition amount of the hexachloroethane is 0.3-0.8 wt% of the total mass of the aluminum alloy melt.

6. A method of producing a rare earth microalloyed Al-Fe-Si based multipurpose aluminum alloy wire according to claim 1, characterized in that, In step (4), the specific method of casting is: pouring the refined aluminum alloy melt into a mold preheated to 300-450°C, and naturally cooling in a room temperature environment to form an aluminum alloy casting rod.

7. A method of producing a rare earth microalloyed Al-Fe-Si based multipurpose aluminum alloy wire according to claim 1, characterized in that, In step (5), the specific method of solid solution treatment is: placing the aluminum alloy casting rod into a muffle furnace, keeping the temperature at 500-520°C for 4-6 hours, then quickly taking out the aluminum alloy casting rod from the furnace and naturally cooling to room temperature to obtain the solid-solution-treated aluminum alloy casting rod.

8. A method of producing a rare earth microalloyed Al-Fe-Si based multipurpose aluminum alloy wire according to claim 1, characterized in that, In step (7), the torsion-extrusion combined cold deformation is operated at room temperature.

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