Rare earth element reinforced aluminum alloy material and preparation method of aluminum lamp pole

Abstract

The invention discloses a rare earth element reinforced aluminum alloy material which comprises the following chemical components in percentage by mass: 0.4 to 1.4 percent of Mg, 0.4 to 1.8 percent of Si, 0.2 to 0.8 percent of Cu, 0.4 to 1.4 percent of Mn, 0.1 to 0.5 percent of Zn, 0.03 to 0.3 percent of Hf, 0.03 to 0.3 percent of Zr, 0.03 to 0.3 percent of Co, 0.03 to 0.3 percent of W, 0.01 to 0.3 percent of In, 0.01 to 0.3 percent of Ti, 0.002 to 0.02 percent of B, 0.0003 to 0.002 percent of Be, 0.03 to 0.5 percent of Pr, 0.03 to 0.5 percent of Nd, 0.03 to 0.5 percent of Eu, less than or equal to 0.3 percent of Fe, less than or equal to 0.03 percent of other inevitable single impurity elements, less than or equal to 0.15 percent of total impurity elements and the balance of aluminum. The rare earth element reinforced aluminum alloy material is prepared through the steps of fusion casting, extrusion, heat treatment and the like, and then the aluminum lamp pole is prepared after the rare earth element reinforced aluminum alloy material is cut, welded, assembled and sprayed. The aluminum alloy material disclosed by the invention has excellent mechanical properties, and the prepared aluminum lamp pole has relatively long service life and relatively low manufacturing cost.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum alloy materials and casting, and particularly relates to a preparation method of an aluminum alloy material reinforced with a rare earth element and an aluminum lamp pole. Background Art

[0002] At present, most of the street light poles and garden light poles used in municipal construction and community courtyards in my country are made of steel materials, which are heavy and not corrosion-resistant. In coastal areas with high humidity and atmospheric salinity and heavy industrial concentrated areas with acidic rainfall, steel light poles are severely corroded, and their lifespan is significantly reduced due to corrosion in the atmospheric environment, far below the designed lifespan, resulting in high maintenance costs and expenses. Aluminum alloy has stronger corrosion resistance than steel. Light poles made of aluminum alloy have a longer service life in the same environment. Aluminum alloy is well formed, can be anodized, and has rich appearance shapes and colors. Therefore, aluminum alloy materials are gradually being used in the fields of street light poles and garden light poles. However, the strength of the aluminum alloy currently used for light poles is insufficient, the wall thickness of the light pole pipe is high, the manufacturing cost is much higher than that of steel light poles, and the height of the light pole is severely limited, which is not conducive to the application, promotion and popularization of aluminum light poles. Therefore, it is urgent to develop a new aluminum alloy material with high strength, excellent corrosion resistance and low and controllable production cost to replace steel materials and lay the foundation for the application, promotion and popularization of aluminum light poles. Summary of the invention

[0003] In view of the above-mentioned deficiencies, the present invention discloses a rare earth element reinforced aluminum alloy material and a preparation method of an aluminum lamp pole, which improves the performance of the aluminum alloy material, solves the problems of insufficient strength and high manufacturing cost of the current aluminum lamp pole materials, and promotes the promotion and application of aluminum lamp poles.

[0004] The present invention is achieved by adopting the following technical solutions: A rare earth element enhanced aluminum alloy material, comprising the following chemical components in mass fractions: Mg: 0.4~1.4%, Si: 0.4~1.8%, Cu: 0.2~0.8%, Mn: 0.4~1.4%, Zn: 0.1~0.5%, Hf: 0.03~0.3%, Zr: 0.03~0.3%, Co: 0.03~0.3%, W: 0.03~0.3%, In: 0.01~0.3%, Ti: 0.01~0.3%, B: 0.002~0.02%, Be: 0.0003~0.002%, Pr: 0.03~0.5%, Nd: 0.03~0.5%, Eu: 0.03~0.5%, Fe≤0.3%, other unavoidable single impurity elements ≤0.03%, the total amount of impurity elements ≤0.15%, the balance is aluminum.

[0005] The present invention uses silicon (Si), copper (Cu), magnesium (Mg), and zinc (Zn) as main alloying elements, and optimizes their content ratios. First, the Mg element has the characteristics of high solid solubility and supersaturation in aluminum alloys and strong solid solution strengthening effect, so as to improve the strength of the alloy material. Second, Si, Mg, Cu, and Zn elements can form β, q, η, S and their metastable phases β'', q'', η'', S'' and other nano-scale substances in aluminum alloys to hinder dislocation migration, produce strong precipitation strengthening effect, and improve the strength of the alloy material. Third, by adjusting the dosage ratio of Si, Mg, Cu, and Zn elements, in addition to precipitation, they are still partially dissolved in the matrix lattice, thereby producing a certain degree of solid solution strengthening effect, thereby improving the strength of the alloy material.

[0006] At the same time, the present invention adds transition metal elements such as manganese (Mn), hafnium (Hf), zirconium (Zr), cobalt (Co), and tungsten (W), whose melting points and densities are much higher than aluminum. These elements can form Al in aluminum alloys. 7 Mn、Al 3 Hf、Al 3 Zr、Al 9 Co 2 、Al 12 W intermetallic compounds. When these elements exist in the aluminum alloy system at the same time and their contents are low, these elements will interact with each other to form a chemical formula of Al 3 (Hf a ,Zr b ,Co c ,W d ) complex intermetallic compound, where (a+b+c+d=1, a≤1, b≤1, c≤1, d≤1), and Al 7 Mn、Al 3 Hf、Al 3 Zr、Al 9 Co 2 、Al 12 W intermetallic compounds. These substances can provide an effective heterogeneous nucleation interface for the nucleation of α-Al during the solidification of aluminum alloy liquid casting, reduce the energy barrier for the nucleation of α-Al grains, and increase the nucleation rate, which is manifested as the refinement of ingot grains on a macro scale. In addition, these elements can gradually precipitate nano-scale intermetallic compounds during a series of heat treatment processes of the material, such as homogenization, hot extrusion, solution treatment, artificial aging, etc., which is beneficial to further improve the strength of the alloy material.

[0007] The indium (In) added in the present invention is a rare metal element. Adding a small amount of In element can accelerate the precipitation of metastable phases β', q', η', S' and β, q, η, S and other nano-scale substances from the supersaturated solid solution, shortening the artificial aging process; and the beryllium (Be) element is an alkaline earth metal element. After being added into the aluminum alloy, it can reduce the burnout of the Mg element in the alloy, and also play a role in controlling the hydrogen content in the alloy.

[0008] The rare earth elements praseodymium (Pr), neodymium (Nd), and europium (Eu) added in the present invention can form Al 11 Pr 3 、Al 3 Nd、Al 3 Eu intermetallic compounds, if the three exist in aluminum alloy at the same time and the content is low, Al 3 (Pr x ,Nd y ,Eu z ) (x+y+z=1, x≤1, y≤1, z≤1) complex intermetallic compounds, and Al 11 Pr 3 、Al 3 Nd、Al 3 Eu intermetallic compounds. These substances can also provide an effective heterogeneous nucleation interface for the nucleation of α-Al during the solidification of aluminum alloy liquid casting, reduce the energy barrier of α-Al grain nucleation, and increase the nucleation rate, which is manifested as the refinement of ingot grains on a macro scale. In addition, these substances can also hinder the formation of dislocations generated during the deformation of aluminum alloys, promote the nucleation of recrystallized grains during the recrystallization process, and refine the recrystallized grains, so that the aluminum alloy material can retain a certain processing state structure and have a large number of fine non-distorted recrystallized structures, while improving the strength and plasticity of the aluminum alloy material.

[0009] Furthermore, the rare earth element enhanced aluminum alloy material comprises the following chemical components in mass fraction: Mg: 0.6~1.3%, Si: 0.5~1.6%, Cu: 0.3~0.7%, Mn: 0.6~1.3%, Zn: 0.2~0.4%, Hf: 0.05~0.25%, Zr: 0.05~0.25%, Co: 0.05~0.25%, W: 0.05~0.25%, In: 0.01~0.2%, Ti: 0.01~0.15%, B: 0.004~0.015%, Be: 0.0005~0.0015%, Pr: 0.05~0.4%, Nd: 0.05~0.4%, Eu: 0.05~0.4%, Fe≤0.2%, other unavoidable single impurity elements ≤0.03%, the total amount of impurity elements ≤0.15%, the balance is aluminum.

[0010] Furthermore, the total content of the three elements Pr, Nd and Eu is not less than 0.3% and not more than 1.0%, and the content ratio of the three elements Pr, Nd and Eu is (2-5):(1-3):(1-3). By adjusting the dosage ratio of the three rare earth elements praseodymium (Pr), neodymium (Nd) and europium (Eu), a suitable complex intermetallic compound can be formed in the aluminum alloy, and a better performance improvement effect can be obtained.

[0011] The method for preparing the rare earth element reinforced aluminum alloy material comprises the following steps: (1) Weigh raw materials in proportion, including aluminum ingots, copper materials, silicon materials, metal magnesium ingots, metal zinc ingots, aluminum-hafnium master alloys, aluminum-zirconium master alloys, aluminum-cobalt master alloys, aluminum-tungsten master alloys, metal indium ingots, aluminum-titanium-boron master alloys, aluminum-beryllium master alloys, and rare earth aluminum master alloys; (2) placing aluminum ingots, copper materials, silicon materials, metal zinc ingots, aluminum hafnium master alloys, aluminum zirconium master alloys, aluminum cobalt master alloys, aluminum tungsten master alloys, metal indium ingots, aluminum beryllium master alloys, and rare earth aluminum master alloys in a smelting furnace and heating them to melt, then performing first-stage smelting at 760-860° C. for 2-5 hours, adding metal magnesium ingots for second-stage smelting after the materials are melted and mixed evenly, the second-stage smelting temperature is 720-800° C. for 1-3 hours; after the second-stage smelting is completed, a high-temperature aluminum alloy liquid is obtained; (3) The high-temperature aluminum alloy liquid obtained in step (2) is subjected to a primary refining at 720-800°C for 30-60 minutes. After the primary refining is completed, a sample is taken for chemical composition analysis. If there is a deviation in the composition, the raw material described in step (1) is used to adjust the composition and sample analysis is performed until all elements reach the expected index. After each composition adjustment, a secondary refining is required and then sampling and analysis are performed. The secondary refining time is 15-30 minutes and the secondary refining temperature is controlled at 720-800°C. (4) releasing the high-temperature aluminum alloy liquid treated in step (3) for casting, adding aluminum-titanium-boron master alloy to refine the grains after the high-temperature aluminum alloy liquid enters the launder, and then the high-temperature aluminum alloy liquid is subjected to double-stage filtration and then passes through a crystallizer into a casting mold for semi-continuous casting to obtain a rod-shaped ingot; Titanium (Ti) and boron (B) elements are added through aluminum-titanium-boron master alloy. Adding aluminum-titanium-boron master alloy online in the launder can produce a certain grain refinement effect on aluminum alloy ingots. (5) placing the rod-shaped ingot obtained in step (4) into an aluminum rod heating furnace, heating it to 500-600° C., and then keeping it warm for no less than 4 hours, and then extruding it to obtain a profile of the desired shape and length, wherein the profile includes any one of a lamp pole main body pipe, an arm pipe, a base plate, and a base reinforcement plate; (6) The profile obtained in step (5) is placed in an aging furnace for artificial aging treatment, and after the artificial aging treatment is completed, a rare earth element reinforced aluminum alloy material is obtained.

[0012] The obtained rare earth element reinforced aluminum alloy material can achieve the following performance parameters: yield strength ≥340MPa, tensile strength ≥41MPa, elongation after fracture ≥18%, and resistance to neutral salt spray test up to 500 hours.

[0013] Furthermore, the copper material in step (1) is any one or more combinations of electrolytic copper, copper wire and copper ingot; the silicon material is any one or two of metallic silicon and aluminum-silicon master alloy; the rare earth aluminum master alloy is any one or more combinations of aluminum-praseodymium master alloy, aluminum-neodymium master alloy and aluminum-europium master alloy.

[0014] Furthermore, in step (2), stirring is maintained during the first stage of smelting at a speed of 60 to 200 r / min. Because some elements in the alloy composition have a specific gravity much higher than that of aluminum, the aluminum alloy liquid needs to be stirred during the smelting process to allow them to be quickly mixed and evenly mixed.

[0015] Furthermore, in step (3), a mixed gas obtained by mixing high-purity argon gas with a concentration of 99.999%, high-purity nitrogen gas with a concentration of 99.999% and high-purity chlorine gas with a concentration of 99.999% is used in both the primary refining and the secondary refining processes, wherein the high-purity argon gas accounts for 60%, the high-purity nitrogen gas accounts for 37%, and the high-purity chlorine gas accounts for 3%.

[0016] Furthermore, in step (4), the first-stage filter plate of the double-stage filtration treatment is 60 mesh, and the second-stage filter plate is 80 mesh; the temperature of the high-temperature aluminum alloy liquid above the casting mold is maintained at 640-720°C, and the crystallizer descent speed is 50-250 mm / min.

[0017] Furthermore, in step (6), the artificial aging temperature is 150 to 220° C., and the artificial aging time is 3 to 16 hours.

[0018] A method for manufacturing an aluminum lamp pole, comprising the following steps: S1. Cut, assemble and weld the above rare earth element reinforced aluminum alloy material to form a lower lamp pole, a middle lamp pole, an upper lamp pole and a lamp pole support arm respectively; wherein, one end of the pipe with a larger diameter is subjected to pipe shrinkage processing, and the other end is assembled with the base plate and the base reinforcement plate and laser welded to firmly form the lower lamp pole; one end of the middle lamp pole is subjected to pipe shrinkage processing according to the size of the connected pipe; the upper lamp pole does not need to be subjected to pipe shrinkage processing; arm pipes of different specifications are assembled and laser welded to form the lamp pole support arm; S2. Develop the processing technology of the lamp pole according to its height. If the lamp pole is lower than 8 meters, it will be assembled in two sections; if the lamp pole is higher than 8 meters, it will be assembled in three sections; S3, covering the connection surfaces of the lower lamp pole, the middle lamp pole, the upper lamp pole, and the lamp pole support arm with a high temperature resistant plastic film, and then electrostatically spraying the film to produce the components with the color and appearance required by the customer and packing them; S4, transporting the lower lamp pole, middle lamp pole, upper lamp pole and lamp pole support arm processed in step S3 to the installation site for assembly as needed, and connecting the lamp poles of different parts with bolts to obtain an aluminum lamp pole.

[0019] Compared with the prior art, this technical solution has the following beneficial effects: 1. The invention adds rare earth elements praseodymium (Pr), neodymium (Nd), and europium (Eu) to aluminum alloy, which can improve the mechanical properties and plasticity of aluminum alloy materials from multiple aspects, thereby improving the toughness, fatigue resistance and other indicators of the material. At the same time, manganese (Mn), hafnium (Hf), zirconium (Zr), cobalt (Co), tungsten (W), praseodymium (Pr), neodymium (Nd), europium (Eu) elements and aluminum-titanium-boron master alloy are comprehensively utilized to perform grain refinement treatment on alloy ingots from multiple aspects, so as to achieve the purpose of reducing grain size and weakening segregation.

[0020] 2. In order to comprehensively utilize the solid solution strengthening and precipitation strengthening effects of Si, Cu, Mg, and Zn elements, the present invention reduces the addition amount of each main alloying element, regulates the effects of solid solution strengthening and precipitation strengthening, reduces the adverse effects of solid solution strengthening and precipitation strengthening on the plasticity of aluminum alloys, and comprehensively improves the strength and plasticity of aluminum alloy materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a 200-fold metallographic image of the rare earth element-enhanced rod-shaped ingot obtained in Example 1 in the cast state.

[0022] Figure 2 This is a metallographic image 200 times larger than that of the lamp pole profile obtained in Example 1.

[0023] Figure 3 This is a metallographic image 500 times larger than the lamp pole profile obtained in Example 1.

[0024] Figure 4 It is the stress-strain curve obtained by tensile testing of the lamp pole profile obtained in Example 1. DETAILED DESCRIPTION

[0025] The present invention is further described by the following examples, but is not intended to be limiting of the present invention. Specific experimental conditions and methods not specified in the following examples are conventional methods commonly known to those skilled in the art.

[0026] Embodiment 1: A rare earth element enhanced aluminum alloy material, comprising the following chemical components in mass fractions: Mg: 1.23%, Si: 0.88%, Cu: 0.62%, Mn: 1.04%, Zn: 0.31%, Hf: 0.11%, Zr: 0.19%, Co: 0.20%, W: 0.09%, In: 0.02%, Ti: 0.04%, B: 0.008%, Be: 0.0008%, Pr: 0.17%, Nd: 0.24%, Eu: 0.13%, Fe: 0.18%, other unavoidable single impurity elements ≤ 0.03%, the total amount of impurity elements ≤ 0.15%, the balance is aluminum.

[0027] The method for preparing the rare earth element enhanced aluminum alloy material described in this embodiment comprises the following steps: (1) Weighing raw materials in proportion, the raw materials include aluminum ingots, copper materials, silicon materials, metal magnesium ingots, metal zinc ingots, aluminum hafnium master alloys, aluminum zirconium master alloys, aluminum cobalt master alloys, aluminum tungsten master alloys, metal indium ingots, aluminum titanium boron master alloys, aluminum beryllium master alloys, and rare earth aluminum master alloys; the copper material is electrolytic copper; the silicon material is an aluminum silicon master alloy; the rare earth aluminum master alloy is a combination of an aluminum praseodymium master alloy, an aluminum neodymium master alloy, and an aluminum europium master alloy; (2) placing aluminum ingots, copper materials, silicon materials, metal zinc ingots, aluminum hafnium master alloys, aluminum zirconium master alloys, aluminum cobalt master alloys, aluminum tungsten master alloys, metal indium ingots, aluminum beryllium master alloys, and rare earth aluminum master alloys in a smelting furnace and heating them to melt, then performing first-stage smelting at 820° C. for 4 hours, maintaining stirring during the first-stage smelting process at a stirring speed of 100 r / min, and adding metal magnesium ingots after the furnace materials are melted and mixed uniformly for second-stage smelting, the second-stage smelting temperature is 765° C. for 1.5 hours; after the second-stage smelting is completed, a high-temperature aluminum alloy liquid is obtained; (3) The high-temperature aluminum alloy liquid obtained in step (2) is subjected to a primary refining at 765°C for 45 minutes. After the primary refining is completed, a sample is taken for chemical composition analysis. If there is a deviation in the composition, the raw material described in step (1) is used to adjust the composition and sample analysis is performed until all elements reach the expected indicators. After each composition adjustment, a secondary refining is required and then sampling and analysis are performed. The secondary refining time is 20 minutes and the secondary refining temperature is controlled at 765°C. (4) releasing the high-temperature aluminum alloy liquid treated in step (3) for casting, adding aluminum-titanium-boron master alloy to the high-temperature aluminum alloy liquid after entering the flow channel for grain refinement, and then the high-temperature aluminum alloy liquid is subjected to double-stage filtration treatment and then enters the casting mold through a crystallizer for semi-continuous casting to obtain a rod-shaped ingot with a diameter of 178 mm; the first-stage filter plate of the double-stage filtration treatment is 60 mesh, and the second-stage filter plate is 80 mesh; the temperature of the high-temperature aluminum alloy liquid above the casting mold is maintained at 715° C., and the crystallizer descends at a speed of 124 mm / min; (5) The rod-shaped ingot obtained in step (4) is placed in an aluminum rod heating furnace, heated to 545°C, and then kept warm for 6 hours, followed by extrusion processing to obtain a profile of the desired shape and length, wherein the profile includes pipes and plates with the following cross-sectional dimensions: Ф113mm*2.5mm, Ф80mm*1.8mm, Ф48mm*1.8mm, Ф30mm*1.6mm, 250mm*6.0mm, and 60mm*3mm. The profile is used for the main pipe of the lamp pole, the arm pipe, the base plate, and the base reinforcement plate; (6) placing the profile obtained in step (5) into an aging furnace for artificial aging treatment, and obtaining a rare earth element reinforced aluminum alloy material after the artificial aging treatment is completed; the artificial aging temperature is 175° C., and the artificial aging time is 9 hours; In the primary refining and secondary refining processes, a mixed gas is used, which is obtained by mixing high-purity argon with a concentration of 99.999%, high-purity nitrogen with a concentration of 99.999% and high-purity chlorine with a concentration of 99.999%. The high-purity argon accounts for 60%, the high-purity nitrogen accounts for 37%, and the high-purity chlorine accounts for 3%.

[0028] A method for manufacturing an aluminum lamp pole, comprising the following steps: S1. Cut, assemble and weld the rare earth element reinforced aluminum alloy material to form a lower lamp pole, a middle lamp pole, an upper lamp pole and a lamp pole arm respectively; wherein, a 113mm*2.5mm tube is cut into a length of 3.1 meters, one end is shrunk to form a 76.4mm connector, and the excess part of the connector is cut off to keep the length of the shrunk part at about 0.1m, which is used to connect with the upper lamp pole; a plate with a cross-section of 250mm*6.0mm is cut into a size of 250mm*6.0mm*250mm, and spliced ​​with a 113mm*2.5mm tube and laser-cut. Laser welding is firm. The plate with a cross-section of 60mm*3mm is cut into pieces of appropriate size, which are used as reinforcement plates between the base and the pipe, and laser welding is used to firmly make the lower part of the lamp pole; the Ф80mm*1.8mm pipe is cut into 3 meters in length, and one end is sealed with a 76mm diameter disc cut from the 60mm*3mm plate and laser welding is used to firmly make the upper part of the lamp pole; the Ф48mm*1.8mm pipe is cut into 1 meter in length, and the Ф30mm*1.6mm pipe is cut into 0.8 meter in length. The two are firmly laser welded to make the lamp pole arm part for installing lamps; S2, adopts two-stage assembly; S3, covering the connection surfaces of the components made in step S1 with a high temperature resistant plastic film and then performing electrostatic spraying to make components with the required color coating and package them; S4. The components processed in step S3 are transported to the installation site for assembly as needed. The lamp poles of different parts are connected with bolts, and after the lamps are installed and powered on, a 6-meter-high aluminum pole street lamp is obtained.

[0029] Embodiment 2: A rare earth element enhanced aluminum alloy material, comprising the following chemical components in mass fractions: Mg: 0.76%, Si: 0.93%, Cu: 0.65%, Mn: 1.22%, Zn: 0.23%, Hf: 0.19%, Zr: 0.10%, Co: 0.17%, W: 0.21%, In: 0.018%, Ti: 0.03%, B: 0.006%, Be: 0.0011%, Pr: 0.35%, Nd: 0.16%, Eu: 0.28%, Fe: 0.14%, other unavoidable single impurity elements ≤ 0.03%, the total amount of impurity elements ≤ 0.15%, the balance is aluminum.

[0030] The method for preparing the rare earth element enhanced aluminum alloy material described in this embodiment comprises the following steps: (1) Weighing raw materials in proportion, the raw materials include aluminum ingots, copper materials, silicon materials, metal magnesium ingots, metal zinc ingots, aluminum hafnium master alloys, aluminum zirconium master alloys, aluminum cobalt master alloys, aluminum tungsten master alloys, metal indium ingots, aluminum titanium boron master alloys, aluminum beryllium master alloys, and rare earth aluminum master alloys; the copper material is copper ingots; the silicon material is metal silicon; the rare earth aluminum master alloy is a combination of aluminum praseodymium master alloys, aluminum neodymium master alloys, and aluminum europium master alloys; (2) placing aluminum ingots, copper materials, silicon materials, metal zinc ingots, aluminum hafnium master alloys, aluminum zirconium master alloys, aluminum cobalt master alloys, aluminum tungsten master alloys, metal indium ingots, aluminum beryllium master alloys, and rare earth aluminum master alloys in a smelting furnace and heating them to melt, then performing first-stage smelting at 840° C. for 3.5 hours, maintaining stirring during the first-stage smelting process at a stirring speed of 80 r / min, adding metal magnesium ingots after the furnace materials are melted and mixed uniformly for second-stage smelting, the second-stage smelting temperature is 745° C. for 2 hours; after the second-stage smelting is completed, a high-temperature aluminum alloy liquid is obtained; (3) The high-temperature aluminum alloy liquid obtained in step (2) is subjected to a primary refining at 745°C for 60 minutes. After the primary refining is completed, a sample is taken for chemical composition analysis. If there is a deviation in the composition, the raw material described in step (1) is used to adjust the composition and sample analysis is performed until all elements reach the expected indicators. After each composition adjustment, a secondary refining is required and then sampling and analysis are performed. The secondary refining time is 20 minutes and the secondary refining temperature is controlled at 745°C. (4) releasing the high-temperature aluminum alloy liquid treated in step (3) for casting, adding aluminum-titanium-boron master alloy to the high-temperature aluminum alloy liquid after entering the flow channel for grain refinement, and then the high-temperature aluminum alloy liquid is subjected to double-stage filtration treatment and then enters the casting mold through a crystallizer for semi-continuous casting to obtain a rod-shaped ingot with a diameter of 178 mm; at 700° C. of the double-stage filtration treatment, the crystallizer descends at a speed of 108 mm / min; (5) The rod-shaped ingot obtained in step (4) is placed in an aluminum rod heating furnace, heated to 535°C, and then kept warm for 7 hours, followed by extrusion processing to obtain a profile of the desired shape and length, wherein the profile includes pipes and plates with the following cross-sectional dimensions: Ф113mm*2.8mm, Ф100mm*2.0mm, Ф80mm*2.0mm, Ф48mm*1.8mm, Ф30mm*1.6mm, 300mm*6.0mm, and 60mm*3mm. The profile is used for the main pipe of the lamp pole, the arm pipe, the base plate, and the base reinforcement plate; (6) placing the profile obtained in step (5) into an aging furnace for artificial aging treatment, and obtaining a rare earth element-reinforced aluminum alloy material after the artificial aging treatment; the artificial aging temperature is 185° C., and the artificial aging time is 8 hours; In the primary refining and secondary refining processes, a mixed gas is used, which is obtained by mixing high-purity argon with a concentration of 99.999%, high-purity nitrogen with a concentration of 99.999% and high-purity chlorine with a concentration of 99.999%. The high-purity argon accounts for 60%, the high-purity nitrogen accounts for 37%, and the high-purity chlorine accounts for 3%.

[0031] A method for manufacturing an aluminum lamp pole, comprising the following steps: S1. Cut, assemble and weld the rare earth element reinforced aluminum alloy material to form a lower lamp pole, a middle lamp pole, an upper lamp pole and a lamp pole support arm respectively; wherein, cut the Ф113mm*2.8mm tube into a length of 3.1 meters, shrink one end to form a Ф96mm connector, and cut off the excess part of the connector to keep the length of the shrink part at about 0.1m for connection with the middle lamp pole; cut the plate with a cross section of 300mm*6.0mm into a size of 300mm*6.0mm*300mm, splice it with the Ф113mm*2.8mm tube and weld it firmly with laser welding; cut the plate with a cross section of 60mm*3mm into blocks of appropriate size for use as the reinforcing plate between the base and the tube, and use laser welding to weld it firmly; Weld firmly to make the lower part of the lamp pole; cut the Ф100mm*2.0mm pipe into 3.1 lengths, shrink one end to make a Ф76mm connector, and cut off the excess part of the connector to keep the length of the shrink part at about 0.1m, which is used to connect with the upper lamp pole to make the middle part of the lamp pole; cut the Ф80mm*1.8mm pipe into 2 meters in length, seal one end with a 76mm diameter disc cut from a 60mm*3mm plate and weld it firmly with laser welding to make the upper part of the lamp pole; cut the Ф48mm*1.8mm pipe into 1.5 meters in length, cut the Ф30mm*1.6mm pipe into 1.2 meters in length, and weld the two firmly with laser welding to make the lamp pole arm part for installing lamps; S2, adopts three-stage assembly; S3, covering the connection surfaces of the components made in step S1 with a high temperature resistant plastic film and then performing electrostatic spraying to make components with the required color coating and package them; S4. The components processed in step S3 are transported to the installation site for assembly as needed. The lamp poles of different parts are connected with bolts, and after the lamps are installed and powered on, an 8-meter-high aluminum pole street lamp is obtained.

[0032] Embodiment 3: A rare earth element enhanced aluminum alloy material, comprising the following chemical components in mass fractions: Mg: 0.87%, Si: 1.36%, Cu: 0.36%, Mn: 0.98%, Zn: 0.39%, Hf: 0.23%, Zr: 0.11%, Co: 0.22%, W: 0.16%, In: 0.08%, Ti: 0.05%, B: 0.01%, Be: 0.0009%, Pr: 0.39%, Nd: 0.27%, Eu: 0.18%, Fe: 0.12%, other unavoidable single impurity elements ≤ 0.03%, the total amount of impurity elements ≤ 0.15%, the balance is aluminum.

[0033] The method for preparing the rare earth element enhanced aluminum alloy material described in this embodiment comprises the following steps: (1) Weighing raw materials in proportion, the raw materials include aluminum ingots, copper materials, silicon materials, metal magnesium ingots, metal zinc ingots, aluminum hafnium master alloys, aluminum zirconium master alloys, aluminum cobalt master alloys, aluminum tungsten master alloys, metal indium ingots, aluminum titanium boron master alloys, aluminum beryllium master alloys, and rare earth aluminum master alloys; the copper material is electrolytic copper; the silicon material is an aluminum silicon master alloy; the rare earth aluminum master alloy is a combination of an aluminum praseodymium master alloy, an aluminum neodymium master alloy, and an aluminum europium master alloy; (2) placing aluminum ingots, copper materials, silicon materials, metal zinc ingots, aluminum hafnium master alloys, aluminum zirconium master alloys, aluminum cobalt master alloys, aluminum tungsten master alloys, metal indium ingots, aluminum beryllium master alloys, and rare earth aluminum master alloys in a smelting furnace and heating them to melt, then performing first-stage smelting at 830° C. for 4 hours, maintaining stirring during the first-stage smelting process at a stirring speed of 80 r / min, and adding metal magnesium ingots after the furnace materials are melted and mixed uniformly for second-stage smelting, the second-stage smelting temperature is 735° C. for 2.5 hours; after the second-stage smelting is completed, a high-temperature aluminum alloy liquid is obtained; (3) The high-temperature aluminum alloy liquid obtained in step (2) is subjected to a primary refining at 735°C for 60 minutes. After the primary refining is completed, a sample is taken for chemical composition analysis. If there is a deviation in the composition, the raw material described in step (1) is used to adjust the composition and sample analysis is performed until all elements reach the expected indicators. After each composition adjustment, a secondary refining is required and then sampling and analysis are performed. The secondary refining time is 20 minutes and the secondary refining temperature is controlled at 735°C. (4) releasing the high-temperature aluminum alloy liquid treated in step (3) for casting, adding aluminum-titanium-boron master alloy to the high-temperature aluminum alloy liquid after entering the flow channel for grain refinement, and then the high-temperature aluminum alloy liquid is subjected to double-stage filtration treatment and then enters the casting mold through a crystallizer for semi-continuous casting to obtain a rod-shaped ingot with a diameter of 178 mm; the first-stage filter plate of the double-stage filtration treatment is 60 mesh, and the second-stage filter plate is 80 mesh; the temperature of the high-temperature aluminum alloy liquid above the casting mold is maintained at 690° C., and the crystallizer descends at a speed of 115 mm / min; (5) The rod-shaped ingot obtained in step (4) is placed in an aluminum rod heating furnace, heated to 555°C, and then kept warm for 7 hours, followed by extrusion processing to obtain a profile of the desired shape and length, wherein the profile includes pipes and plates with the following cross-sectional dimensions: Ф113mm*3.0mm, Ф100mm*2.0mm, Ф80mm*2.0mm, Ф48mm*1.8mm, Ф30mm*1.6mm, 300mm*6.0mm, and 60mm*3mm. The profile is used for the main pipe of the lamp pole, the arm pipe, the base plate, and the base reinforcement plate; (6) placing the profile obtained in step (5) into an aging furnace for artificial aging treatment, and obtaining a rare earth element-reinforced aluminum alloy material after the artificial aging treatment; the artificial aging temperature is 185° C., and the artificial aging time is 8 hours; In the primary refining and secondary refining processes, a mixed gas is used, which is obtained by mixing high-purity argon with a concentration of 99.999%, high-purity nitrogen with a concentration of 99.999% and high-purity chlorine with a concentration of 99.999%. The high-purity argon accounts for 60%, the high-purity nitrogen accounts for 37%, and the high-purity chlorine accounts for 3%.

[0034] A method for manufacturing an aluminum lamp pole comprises the following steps: S1. Cut, assemble and weld the rare earth element reinforced aluminum alloy material to form a lower lamp pole, a middle lamp pole, an upper lamp pole and a lamp pole support arm respectively; wherein, cut the Ф113mm*3.0mm tube into a length of 3.1 meters, shrink one end to form a Ф96mm connector, and cut off the excess part of the connector to keep the length of the shrink part at about 0.1m for connection with the middle lamp pole; cut the plate with a cross section of 300mm*6.0mm into a size of 300mm*6.0mm*300mm, splice it with the Ф113mm*3.0mm tube and weld it firmly with laser welding; cut the plate with a cross section of 60mm*3mm into blocks of appropriate size for use as the reinforcing plate between the base and the tube, and use laser welding to weld it firmly; Weld firmly to make the lower part of the lamp pole; cut the Ф100mm*2.0mm pipe into 3.1 lengths, shrink one end to make a Ф76mm connector, and cut off the excess part of the connector to keep the length of the shrink part at about 0.1m, which is used to connect with the upper lamp pole to make the middle part of the lamp pole; cut the Ф80mm*1.8mm pipe into 4 meters in length, seal one end with a 76mm diameter disc cut from a 60mm*3mm plate and weld it firmly with laser welding to make the upper part of the lamp pole; cut the Ф48mm*1.8mm pipe into 1.5 meters in length, cut the Ф30mm*1.6mm pipe into 1.2 meters in length, and weld the two firmly with laser welding to make the lamp pole arm part for installing lamps S2, adopts three-stage assembly; S3, covering the connection surfaces of the components made in step S1 with a high temperature resistant plastic film and then performing electrostatic spraying to make components with the required color coating and package them; S4. The components processed in step S3 are transported to the installation site for assembly as needed. The lamp poles of different parts are connected with bolts, and after the lamps are installed and powered on, a 10-meter-high aluminum pole street lamp is obtained.

[0035] Embodiment 4: A rare earth element enhanced aluminum alloy material, comprising the following chemical components in mass fractions: Mg: 0.92%, Si: 1.38%, Cu: 0.5%, Mn: 0.9%, Zn: 0.3%, Hf: 0.18%, Zr: 0.15%, Co: 0.2%, W: 0.2%, In: 0.2%, Ti: 0.15%, B: 0.01%, Be: 0.001%, Pr: 0.4%, Nd: 0.2%, Eu: 0.3%, Fe: 0.2%, other unavoidable single impurity elements ≤ 0.03%, the total amount of impurity elements ≤ 0.15%, the balance is aluminum.

[0036] The method for preparing the rare earth element enhanced aluminum alloy material described in this embodiment comprises the following steps: (1) Weighing raw materials in proportion, the raw materials include aluminum ingots, copper materials, silicon materials, metal magnesium ingots, metal zinc ingots, aluminum hafnium master alloys, aluminum zirconium master alloys, aluminum cobalt master alloys, aluminum tungsten master alloys, metal indium ingots, aluminum titanium boron master alloys, aluminum beryllium master alloys, and rare earth aluminum master alloys; the copper material is a copper ingot; the silicon material is an aluminum silicon master alloy; the rare earth aluminum master alloy is a combination of an aluminum praseodymium master alloy, an aluminum neodymium master alloy, and an aluminum europium master alloy; (2) placing aluminum ingots, copper materials, silicon materials, metal zinc ingots, aluminum hafnium master alloys, aluminum zirconium master alloys, aluminum cobalt master alloys, aluminum tungsten master alloys, metal indium ingots, aluminum beryllium master alloys, and rare earth aluminum master alloys in a smelting furnace and heating them to melt, then performing first-stage smelting at 800° C. for 3.5 hours. During the first-stage smelting process, stirring is maintained at a stirring speed of 100 r / min. When the furnace materials are melted and mixed uniformly, metal magnesium ingots are added for second-stage smelting. The second-stage smelting temperature is 760° C. for 2 hours. After the second-stage smelting is completed, a high-temperature aluminum alloy liquid is obtained. (3) The high-temperature aluminum alloy liquid obtained in step (2) is subjected to a primary refining at 760°C for 40 minutes. After the primary refining is completed, a sample is taken for chemical composition analysis. If there is a deviation in the composition, the raw material described in step (1) is used to adjust the composition and sample analysis is performed until all elements reach the expected indicators. After each composition adjustment, a secondary refining is required and then sampling and analysis are performed. The secondary refining time is 20 minutes and the secondary refining temperature is controlled at 760°C. (4) releasing the high-temperature aluminum alloy liquid treated in step (3) for casting, adding aluminum-titanium-boron master alloy to the flow channel for grain refinement, and then the high-temperature aluminum alloy liquid is subjected to double-stage filtration treatment and then enters the casting mold through a crystallizer for semi-continuous casting to obtain a rod-shaped ingot with a diameter of 178 mm; the first-stage filter plate of the double-stage filtration treatment is 60 mesh, and the second-stage filter plate is 80 mesh; the temperature of the high-temperature aluminum alloy liquid above the casting mold is maintained at 680° C., and the crystallizer descends at a speed of 100 mm / min; (5) The rod-shaped ingot obtained in step (4) is placed in an aluminum rod heating furnace, heated to 550°C, and then kept warm for 6 hours, followed by extrusion processing to obtain a profile of the desired shape and length, wherein the profile includes pipes and plates with the following cross-sectional dimensions: Ф113mm*2.5mm, Ф80mm*1.8mm, Ф48mm*1.8mm, Ф30mm*1.6mm, 250mm*6.0mm, and 60mm*3mm. The profile is used for the main pipe of the lamp pole, the arm pipe, the base plate, and the base reinforcement plate; (6) placing the profile obtained in step (5) into an aging furnace for artificial aging treatment, and obtaining a rare earth element reinforced aluminum alloy material after the artificial aging treatment is completed; the artificial aging temperature is 180° C., and the artificial aging time is 10 hours; In the primary refining and secondary refining processes, a mixed gas is used, which is obtained by mixing high-purity argon with a concentration of 99.999%, high-purity nitrogen with a concentration of 99.999% and high-purity chlorine with a concentration of 99.999%. The high-purity argon accounts for 60%, the high-purity nitrogen accounts for 37%, and the high-purity chlorine accounts for 3%.

[0037] A method for manufacturing an aluminum lamp pole, comprising the following steps: S1. Cut, assemble and weld the rare earth element reinforced aluminum alloy material to form a lower lamp pole, a middle lamp pole, an upper lamp pole and a lamp pole arm respectively; wherein, a 113mm*2.5mm tube is cut into a length of 3.1 meters, one end is shrunk to form a 76.4mm connector, and the excess part of the connector is cut off to keep the length of the shrunk part at about 0.1m, which is used to connect with the upper lamp pole; a plate with a cross-section of 250mm*6.0mm is cut into a size of 250mm*6.0mm*250mm, and spliced ​​with a 113mm*2.5mm tube and laser-cut. Laser welding is firm. The plate with a cross-section of 60mm*3mm is cut into pieces of appropriate size, which are used as reinforcement plates between the base and the pipe, and laser welding is used to firmly make the lower part of the lamp pole; the Ф80mm*1.8mm pipe is cut into 3 meters in length, and one end is sealed with a 76mm diameter disc cut from the 60mm*3mm plate and laser welding is used to firmly make the upper part of the lamp pole; the Ф48mm*1.8mm pipe is cut into 1 meter in length, and the Ф30mm*1.6mm pipe is cut into 0.8 meter in length. The two are firmly laser welded to make the lamp pole arm part for installing lamps; S2, adopts two-stage assembly; S3, covering the connection surfaces of the components made in step S1 with a high temperature resistant plastic film and then performing electrostatic spraying to make components with the required color coating and package them; S4. The components processed in step S3 are transported to the installation site for assembly as needed. The lamp poles of different parts are connected with bolts, and after the lamps are installed and powered on, a 6-meter-high aluminum pole street lamp is obtained.

[0038] Embodiment 5: A rare earth element enhanced aluminum alloy material, comprising the following chemical components in mass fractions: Mg: 0.42%, Si: 0.41%, Cu: 0.23%, Mn: 0.4%, Zn: 0.11%, Hf: 0.033%, Zr: 0.03%, Co: 0.032%, W: 0.032%, In: 0.01%, Ti: 0.012%, B: 0.002%, Be: 0.0003%, Pr: 0.032%, Nd: 0.032%, Eu: 0.034%, Fe: 0.26%, other unavoidable single impurity elements ≤ 0.03%, the total amount of impurity elements ≤ 0.15%, the balance is aluminum.

[0039] The method for preparing the rare earth element enhanced aluminum alloy material described in this embodiment comprises the following steps: (1) Weighing raw materials in proportion, the raw materials include aluminum ingots, copper materials, silicon materials, metal magnesium ingots, metal zinc ingots, aluminum hafnium master alloys, aluminum zirconium master alloys, aluminum cobalt master alloys, aluminum tungsten master alloys, metal indium ingots, aluminum titanium boron master alloys, aluminum beryllium master alloys, and rare earth aluminum master alloys; the copper material is copper wire and copper ingot; the silicon material is metal silicon; the rare earth aluminum master alloy is a combination of aluminum praseodymium master alloy, aluminum neodymium master alloy, and aluminum europium master alloy; (2) placing aluminum ingots, copper materials, silicon materials, metal zinc ingots, aluminum hafnium master alloys, aluminum zirconium master alloys, aluminum cobalt master alloys, aluminum tungsten master alloys, metal indium ingots, aluminum beryllium master alloys, and rare earth aluminum master alloys in a smelting furnace and heating them to melt, then performing first-stage smelting at 760° C. for 3.5 hours. During the first-stage smelting process, stirring is maintained at a stirring speed of 90 r / min. When the furnace materials are melted and mixed uniformly, metal magnesium ingots are added for second-stage smelting. The second-stage smelting temperature is 720° C. for 2 hours. After the second-stage smelting is completed, a high-temperature aluminum alloy liquid is obtained. (3) The high-temperature aluminum alloy liquid obtained in step (2) is subjected to a primary refining at 720°C for 60 minutes. After the primary refining is completed, a sample is taken for chemical composition analysis. If there is a deviation in the composition, the raw material described in step (1) is used to adjust the composition and sample analysis is performed until all elements reach the expected indicators. After each composition adjustment, a secondary refining is required and then sampling and analysis are performed. The secondary refining time is 30 minutes and the secondary refining temperature is controlled at 720°C. (4) releasing the high-temperature aluminum alloy liquid treated in step (3) for casting, adding aluminum-titanium-boron master alloy to the high-temperature aluminum alloy liquid after entering the flow channel for grain refinement, and then the high-temperature aluminum alloy liquid is subjected to double-stage filtration treatment and then enters the casting mold through a crystallizer for semi-continuous casting to obtain a rod-shaped ingot with a diameter of 178 mm; the first-stage filter plate of the double-stage filtration treatment is 60 mesh, and the second-stage filter plate is 80 mesh; the temperature of the high-temperature aluminum alloy liquid above the casting mold is maintained at 640°C, and the crystallizer descends at a speed of 50 mm / min; (5) The rod-shaped ingot obtained in step (4) is placed in an aluminum rod heating furnace and heated to 500-600°C and then kept warm for not less than 4 hours, followed by extrusion processing to obtain a profile of the desired shape and length, wherein the profile includes pipes and plates with the following cross-sectional dimensions: Ф113mm*2.8mm, Ф100mm*2.0mm, Ф80mm*2.0mm, Ф48mm*1.8mm, Ф30mm*1.6mm, 300mm*6.0mm, 60mm*3mm, and the profile is used for the main pipe of the lamp pole, the arm pipe, the base plate, and the base reinforcement plate; (6) placing the profile obtained in step (5) into an aging furnace for artificial aging treatment, and obtaining an aluminum alloy material reinforced with rare earth elements after the artificial aging treatment is completed; the artificial aging temperature is 150° C., and the artificial aging time is 16 hours; In the primary refining and secondary refining processes, a mixed gas is used, which is obtained by mixing high-purity argon with a concentration of 99.999%, high-purity nitrogen with a concentration of 99.999% and high-purity chlorine with a concentration of 99.999%. The high-purity argon accounts for 60%, the high-purity nitrogen accounts for 37%, and the high-purity chlorine accounts for 3%.

[0040] A method for manufacturing an aluminum lamp pole, comprising the following steps: S1. Cut, assemble and weld the rare earth element reinforced aluminum alloy material to form a lower lamp pole, a middle lamp pole, an upper lamp pole and a lamp pole support arm respectively; wherein, cut the Ф113mm*2.8mm tube into a length of 3.1 meters, shrink one end to form a Ф96mm connector, and cut off the excess part of the connector to keep the length of the shrink part at about 0.1m for connection with the middle lamp pole; cut the plate with a cross section of 300mm*6.0mm into a size of 300mm*6.0mm*300mm, splice it with the Ф113mm*2.8mm tube and weld it firmly with laser welding; cut the plate with a cross section of 60mm*3mm into blocks of appropriate size for use as the reinforcing plate between the base and the tube, and use laser welding to weld it firmly; Weld firmly to make the lower part of the lamp pole; cut the Ф100mm*2.0mm pipe into 3.1 lengths, shrink one end to make a Ф76mm connector, and cut off the excess part of the connector to keep the length of the shrink part at about 0.1m, which is used to connect with the upper lamp pole to make the middle part of the lamp pole; cut the Ф80mm*1.8mm pipe into 2 meters in length, seal one end with a 76mm diameter disc cut from a 60mm*3mm plate and weld it firmly with laser welding to make the upper part of the lamp pole; cut the Ф48mm*1.8mm pipe into 1.5 meters in length, cut the Ф30mm*1.6mm pipe into 1.2 meters in length, and weld the two firmly with laser welding to make the lamp pole arm part for installing lamps; S2, adopts three-stage assembly; S3, covering the connection surfaces of the components made in step S1 with a high temperature resistant plastic film and then performing electrostatic spraying to make components with the required color coating and package them; S4. The components processed in step S3 are transported to the installation site for assembly as needed. The lamp poles of different parts are connected with bolts, and after the lamps are installed and powered on, an 8-meter-high aluminum pole street lamp is obtained.

[0041] Embodiment 6: A rare earth element enhanced aluminum alloy material, comprising the following chemical components in mass fractions: Mg: 1.38%, Si: 1.81%, Cu: 0.78%, Mn: 1.42%, Zn: 0.45%, Hf: 0.32%, Zr: 0.3%, Co: 0.32%, W: 0.32%, In: 0.27%, Ti: 0.32%, B: 0.02%, Be: 0.002%, Pr: 0.51%, Nd: 0.49%, Eu: 0.48%, Fe: 0.3%, other unavoidable single impurity elements ≤ 0.03%, the total amount of impurity elements ≤ 0.15%, the balance is aluminum.

[0042] The method for preparing the rare earth element enhanced aluminum alloy material described in this embodiment comprises the following steps: (1) Weighing raw materials in proportion, the raw materials include aluminum ingots, copper materials, silicon materials, metal magnesium ingots, metal zinc ingots, aluminum hafnium master alloys, aluminum zirconium master alloys, aluminum cobalt master alloys, aluminum tungsten master alloys, metal indium ingots, aluminum titanium boron master alloys, aluminum beryllium master alloys, and rare earth aluminum master alloys; the copper material is a combination of electrolytic copper and copper ingots; the silicon material is an aluminum silicon master alloy; the rare earth aluminum master alloy is a combination of aluminum praseodymium master alloys, aluminum neodymium master alloys, and aluminum europium master alloys; (2) placing aluminum ingots, copper materials, silicon materials, metal zinc ingots, aluminum hafnium master alloys, aluminum zirconium master alloys, aluminum cobalt master alloys, aluminum tungsten master alloys, metal indium ingots, aluminum beryllium master alloys, and rare earth aluminum master alloys in a smelting furnace and heating them to melt, then performing first-stage smelting at 860° C. for 3 hours. During the first-stage smelting process, stirring is maintained at a stirring speed of 100 r / min. After the furnace materials are melted and mixed evenly, metal magnesium ingots are added for second-stage smelting. The second-stage smelting temperature is 800° C. for 2 hours. After the second-stage smelting is completed, a high-temperature aluminum alloy liquid is obtained. (3) The high-temperature aluminum alloy liquid obtained in step (2) is subjected to a primary refining at 800°C for 30 minutes. After the primary refining is completed, a sample is taken for chemical composition analysis. If there is a deviation in the composition, the raw material described in step (1) is used to adjust the composition and sample analysis is performed until all elements reach the expected indicators. After each composition adjustment, a secondary refining is required and then sampling and analysis are performed. The secondary refining time is 15 minutes and the secondary refining temperature is controlled at 800°C. (4) releasing the high-temperature aluminum alloy liquid treated in step (3) for casting, adding aluminum-titanium-boron master alloy to the high-temperature aluminum alloy liquid after entering the flow channel for grain refinement, and then the high-temperature aluminum alloy liquid is subjected to double-stage filtration treatment and then enters the casting mold through a crystallizer for semi-continuous casting to obtain a rod-shaped ingot with a diameter of 178 mm; the first-stage filter plate of the double-stage filtration treatment is 60 mesh, and the second-stage filter plate is 80 mesh; the temperature of the high-temperature aluminum alloy liquid above the casting mold is maintained at 720° C., and the crystallizer descends at a speed of 250 mm / min; (5) The rod-shaped ingot obtained in step (4) is placed in an aluminum rod heating furnace, heated to 600°C, and then kept warm for 4 hours, followed by extrusion processing to obtain a profile of the desired shape and length, wherein the profile includes pipes and plates with the following cross-sectional dimensions: Ф113mm*3.0mm, Ф100mm*2.0mm, Ф80mm*2.0mm, Ф48mm*1.8mm, Ф30mm*1.6mm, 300mm*6.0mm, and 60mm*3mm. The profile is used for the main pipe of the lamp pole, the arm pipe, the base plate, and the base reinforcement plate; (6) placing the profile obtained in step (5) into an aging furnace for artificial aging treatment, and obtaining a rare earth element reinforced aluminum alloy material after the artificial aging treatment; the artificial aging temperature is 220° C., and the artificial aging time is 3 hours; In the primary refining and secondary refining processes, a mixed gas is used, which is obtained by mixing high-purity argon with a concentration of 99.999%, high-purity nitrogen with a concentration of 99.999% and high-purity chlorine with a concentration of 99.999%. The high-purity argon accounts for 60%, the high-purity nitrogen accounts for 37%, and the high-purity chlorine accounts for 3%.

[0043] A method for manufacturing an aluminum lamp pole, comprising the following steps: S1. Cut, assemble and weld the rare earth element reinforced aluminum alloy material to form a lower lamp pole, a middle lamp pole, an upper lamp pole and a lamp pole support arm respectively; wherein, cut the Ф113mm*3.0mm tube into a length of 3.1 meters, shrink one end to form a Ф96mm connector, and cut off the excess part of the connector to keep the length of the shrink part at about 0.1m for connection with the middle lamp pole; cut the plate with a cross section of 300mm*6.0mm into a size of 300mm*6.0mm*300mm, splice it with the Ф113mm*3.0mm tube and weld it firmly with laser welding; cut the plate with a cross section of 60mm*3mm into blocks of appropriate size for use as the reinforcing plate between the base and the tube, and use laser welding to weld it firmly; Weld firmly to make the lower part of the lamp pole; cut the Ф100mm*2.0mm pipe into 3.1 lengths, shrink one end to make a Ф76mm connector, and cut off the excess part of the connector to keep the length of the shrink part at about 0.1m, which is used to connect with the upper lamp pole to make the middle part of the lamp pole; cut the Ф80mm*1.8mm pipe into 4 meters in length, seal one end with a 76mm diameter disc cut from a 60mm*3mm plate and weld it firmly with laser welding to make the upper part of the lamp pole; cut the Ф48mm*1.8mm pipe into 1.5 meters in length, cut the Ф30mm*1.6mm pipe into 1.2 meters in length, and weld the two firmly with laser welding to make the lamp pole arm part for installing lamps S2, adopts three-stage assembly; S3, covering the connection surfaces of the components made in step S1 with a high temperature resistant plastic film and then performing electrostatic spraying to make components with the required color coating and package them; S4. The components processed in step S3 are transported to the installation site for assembly as needed. The lamp poles of different parts are connected with bolts, and after the lamps are installed and powered on, a 10-meter-high aluminum pole street lamp is obtained.

[0044] Comparative Example 1: For comparison, an aluminum lamp pole made of 6061 aluminum alloy is used. The 6061 aluminum alloy is made into corresponding extruded profiles through smelting casting, hot extrusion, solution treatment, and artificial aging. A 10-meter-high aluminum alloy lamp pole is obtained through assembly, welding, painting, and installation. The wall thickness of the lower lamp pole is 5.0mm, the wall thickness of the middle lamp pole is 3.5mm, and the wall thickness of the upper lamp pole is 3.0mm.

[0045] Comparative Example 2: A lamp pole produced from Q235 steel is used for comparison. The Q235 steel plate is rolled, welded, spun, assembled, sprayed and installed to obtain a lamp pole with a height of 10 meters and a wall thickness of 3.0 mm.

[0046] Experimental Example 1: A lamp pole was prepared according to the methods described in Examples 1 to 6 and Comparative Examples 1 to 2, and the following tests were performed: Room temperature mechanical properties test: According to GB / T 228.1-2010 "Tensile test of metallic materials Part 1: Room temperature test method", samples were taken at random positions on the lamp pole and machined into tensile specimens, and tested on a tensile testing machine. The results are shown in Table 1.

[0047] Table 1 Mechanical properties test results of light pole materials

[0048] Light pole weight test: The light poles of Examples 1, 2, 3 and Comparative Examples 1 and 2 were weighed (excluding lamps), and the results are shown in Table 2.

[0049] Table 2 Light pole weight test results

[0050] From Table 1 and Figures 1 to 4 It can be seen that the yield strength, tensile strength and elongation of the lamp pole profile obtained by the present invention are much higher than those of the lamp pole profile made of 6061 aluminum alloy, and the yield strength and tensile strength are higher than Q235 steel, and the elongation is equivalent to that of Q235 steel.

[0051] It can be seen from Table 2 that the lamp pole obtained by the present invention has a lower weight. Under the condition of the same height, the weight is lower than that of the traditional 6061 aluminum alloy lamp pole and much lower than that of the Q235 steel lamp pole.

[0052] Experimental Example 2: A rare earth element-enhanced aluminum alloy material was prepared according to the method described in Examples 1 to 6, and the crystal structure and lattice parameters of the aluminum alloy material were detected. The results are shown in Table 3.

[0053] Table 3 Test results of aluminum alloy materials

[0054] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A rare earth element reinforced aluminum alloy material, characterized in that: The chemical components include the following mass fractions: Mg: 0.4~1.4%, Si: 0.4~1.8%, Cu: 0.2~0.8%, Mn: 0.4~1.4%, Zn: 0.1~0.5%, Hf: 0.03~0.3%, Zr: 0.03~0.3%, Co: 0.03~0.3%, W: 0.03~0.3%, In: 0.01~0.3%, Ti: 0.01~0.3%, B: 0.002~0.02%, Be: 0.0003~0.002%, Pr: 0.03~0.5%, Nd: 0.03~0.5%, Eu: 0.03~0.5%, Fe≤0.3%, other unavoidable single impurity elements ≤0.03%, the total amount of impurity elements ≤0.15%, the balance is aluminum.

2. The rare earth element reinforced aluminum alloy material according to claim 1, characterized in that: The rare earth element enhanced aluminum alloy material comprises the following chemical components by mass fraction: Mg: 0.6~1.3%, Si: 0.5~1.6%, Cu: 0.3~0.7%, Mn: 0.6~1.3%, Zn: 0.2~0.4%, Hf: 0.05~0.25%, Zr: 0.05~0.25%, Co: 0.05~0.25%, W: 0.05~0.25%, In: 0.01~0.2%, Ti: 0.01~0.15%, B: 0.004~0.015%, Be: 0.0005~0.0015%, Pr: 0.05~0.4%, Nd: 0.05~0.4%, Eu: 0.05~0.4%, Fe≤0.2%, other unavoidable single impurity elements ≤0.03%, the total amount of impurity elements ≤0.15%, the balance is aluminum.

3. The rare earth element reinforced aluminum alloy material according to claim 1, characterized in that: The total content of the three elements Pr, Nd and Eu is not less than 0.3% and not more than 1.0%, and the content ratio of the three elements Pr, Nd and Eu is (2-5):(1-3):(1-3).

4. The method for preparing the rare earth element-reinforced aluminum alloy material according to any one of claims 1 to 3, characterized in that: The following steps are involved: (1) Weigh raw materials in proportion, including aluminum ingots, copper materials, silicon materials, metal magnesium ingots, metal zinc ingots, aluminum-hafnium master alloys, aluminum-zirconium master alloys, aluminum-cobalt master alloys, aluminum-tungsten master alloys, metal indium ingots, aluminum-titanium-boron master alloys, aluminum-beryllium master alloys, and rare earth aluminum master alloys; (2) placing aluminum ingots, copper materials, silicon materials, metal zinc ingots, aluminum hafnium master alloys, aluminum zirconium master alloys, aluminum cobalt master alloys, aluminum tungsten master alloys, metal indium ingots, aluminum beryllium master alloys, and rare earth aluminum master alloys in a smelting furnace and heating them to melt, then performing first-stage smelting at 760-860° C. for 2-5 hours, adding metal magnesium ingots for second-stage smelting after the materials are melted and mixed evenly, the second-stage smelting temperature is 720-800° C. for 1-3 hours; after the second-stage smelting is completed, a high-temperature aluminum alloy liquid is obtained; (3) The high-temperature aluminum alloy liquid obtained in step (2) is subjected to a primary refining at 720-800°C for 30-60 minutes. After the primary refining is completed, a sample is taken for chemical composition analysis. If there is a deviation in the composition, the raw material described in step (1) is used to adjust the composition and sample analysis is performed until all elements reach the expected index. After each composition adjustment, a secondary refining is required and then sampling and analysis are performed. The secondary refining time is 15-30 minutes and the secondary refining temperature is controlled at 720-800°C. (4) releasing the high-temperature aluminum alloy liquid treated in step (3) for casting, adding aluminum-titanium-boron master alloy to refine the grains after the high-temperature aluminum alloy liquid enters the launder, and then the high-temperature aluminum alloy liquid is subjected to double-stage filtration and then passes through a crystallizer into a casting mold for semi-continuous casting to obtain a rod-shaped ingot; (5) placing the rod-shaped ingot obtained in step (4) into an aluminum rod heating furnace, heating it to 500-600° C., and then keeping it warm for no less than 4 hours, and then extruding it to obtain a profile of the desired shape and length, wherein the profile includes any one of a lamp pole main body pipe, an arm pipe, a base plate, and a base reinforcement plate; (6) The profile obtained in step (5) is placed in an aging furnace for artificial aging treatment, and after the artificial aging treatment is completed, a rare earth element reinforced aluminum alloy material is obtained.

5. The method for preparing the rare earth element reinforced aluminum alloy material according to claim 4, characterized in that: The copper material in step (1) is any one or more combinations of electrolytic copper, copper wire and copper ingot; the silicon material is any one or two of metallic silicon and aluminum-silicon master alloy; the rare earth aluminum master alloy is any one or more combinations of aluminum-praseodymium master alloy, aluminum-neodymium master alloy and aluminum-europium master alloy.

6. The method for preparing the rare earth element reinforced aluminum alloy material according to claim 4, characterized in that: In step (2), stirring is maintained during the first stage of smelting, and the stirring speed is 60 to 200 r / min.

7. The method for preparing the rare earth element reinforced aluminum alloy material according to claim 4, characterized in that: In step (3), the primary refining and secondary refining processes both use a mixed gas obtained by mixing high-purity argon with a concentration of 99.999%, high-purity nitrogen with a concentration of 99.999% and high-purity chlorine with a concentration of 99.999%, wherein the high-purity argon accounts for 60%, the high-purity nitrogen accounts for 37%, and the high-purity chlorine accounts for 3%.

8. The method for preparing the rare earth element reinforced aluminum alloy material according to claim 4, characterized in that: In step (4), the first-stage filter plate of the double-stage filtration treatment is 60 mesh, and the second-stage filter plate is 80 mesh; the temperature of the high-temperature aluminum alloy liquid above the casting mold is maintained at 640-720°C, and the crystallizer descent speed is 50-250 mm / min.

9. The method for preparing the rare earth element enhanced aluminum alloy material according to claim 4, characterized in that: In step (6), the artificial aging temperature is 150 to 220° C., and the artificial aging time is 3 to 16 hours.

10. A method for manufacturing an aluminum lamp pole, characterized in that: The following steps are involved: S1. Cut, assemble and weld the rare earth element reinforced aluminum alloy material described in any one of claims 4 to 9 to respectively form a lower lamp pole, a middle lamp pole, an upper lamp pole and a lamp pole support arm; wherein, one end of the pipe with a larger diameter is subjected to pipe shrinkage processing, and the other end is assembled with the base plate and the base reinforcement plate and laser welded to firmly form the lower lamp pole; one end of the middle lamp pole is subjected to pipe shrinkage processing according to the size of the connected pipe; the upper lamp pole does not need to be subjected to pipe shrinkage processing; arm pipes of different specifications are assembled and laser welded to form the lamp pole support arm; S2. Develop the processing technology of the lamp pole according to its height. If the lamp pole is lower than 8 meters, it will be assembled in two sections; if the lamp pole is higher than 8 meters, it will be assembled in three sections; S3, covering the connection surfaces of the lower lamp pole, the middle lamp pole, the upper lamp pole, and the lamp pole support arm with a high temperature resistant plastic film, and then electrostatically spraying the film to produce the components with the color and appearance required by the customer and packing them; S4, transporting the lower lamp pole, middle lamp pole, upper lamp pole and lamp pole support arm processed in step S3 to the installation site for assembly as needed, and connecting the lamp poles of different parts with bolts to obtain an aluminum lamp pole.

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