Optical aluminum alloy sheet and method for producing the same

Abstract

The application provides an optical aluminum alloy plate and a preparation method thereof. The preparation method comprises the following steps: S1, an original ingot is prepared by using a semi-continuous casting method, and the original ingot is subjected to homogenization treatment to obtain a to-be-processed ingot; S2, the to-be-processed ingot is subjected to rapid solidification treatment by using a single-roll melt strip casting method to obtain a rapid solidification alloy strip; S3, the rapid solidification alloy strip is crushed and then loaded into a mold to be cold-pressed to form a cold-pressed blank, the cold-pressed blank is subjected to covering and sealing to obtain a pre-pressed blank; S4, the pre-pressed blank is sequentially subjected to first cold rolling, hot rolling and second cold rolling to obtain a rolled plate; and S5, the rolled plate is sequentially subjected to solid solution treatment and aging treatment to obtain an optical aluminum alloy plate product. The method can be used for preparing a microcrystalline aluminum alloy plate for a large-specification optical reflector, and the plate has uniform composition, small grain size and dispersed fine precipitated phase.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aluminum alloy material preparation, in particular to an optical aluminum alloy plate and a preparation method thereof. BACKGROUND

[0002] Aluminum alloy has great potential in the manufacture of metal optical mirrors and the like due to its light weight, corrosion resistance and specific mechanical / thermal properties. Unlike the hard and brittle characteristics of glass ceramic materials, aluminum alloy is a commonly used structural material with good processing performance, which can fully utilize various processing techniques to achieve precision machining of optical devices. At present, high-quality optical aluminum alloys for high-end chips and high-end optical information fields mainly rely on imports. The long-term monopoly of material supply by foreign manufacturers has greatly restricted the development of China's semiconductor and high-end optical information industries. In recent years, domestic 6061 aluminum alloys can be processed by a series of surface processing methods such as precision grinding, magnetic flow polishing, ion beam polishing and coating (gold / silver) to prepare mirror surface aluminum alloys with a surface optical reflectivity of ≥90%, but only meet the basic requirements of semiconductor high-end chips and high-end optical information fields.

[0003] The aluminum alloy mirrors currently used are mainly prepared by round bar extrusion. The bar prepared by extrusion needs a large extrusion deformation to eliminate casting defects and refine grain structure, resulting in a small cross-sectional size of the finished bar, which is difficult to meet the demand of large-scale optical products. Inappropriate extrusion process control will produce coarse grain rings on the outside of the bar, reduce the uniformity of the structure and affect the subsequent surface polishing quality of the aluminum alloy finished product.

[0004] Based on the actual application requirements of large-scale optical mirrors, it is an urgent technical problem to be solved in the field to develop large-section, high-precision and high-quality optical aluminum alloy materials to reduce the application cost of domestic optical materials. SUMMARY

[0005] The main purpose of the present application is to provide an optical aluminum alloy plate and a preparation method thereof, to solve the problem of how to prepare an optical aluminum alloy plate with a large cross-sectional size and high optical reflectivity in the prior art.

[0006] In order to achieve the above object, according to one aspect of the present application, a preparation method of an optical aluminum alloy plate is provided, which comprises: step S1, preparing a raw ingot by using a semi-continuous casting method, homogenizing the raw ingot to obtain a to-be-processed ingot; step S2, rapidly solidifying the to-be-processed ingot by using a single-roll melt spinning method to obtain a rapidly solidified alloy strip; step S3, crushing the rapidly solidified alloy strip and then loading it into a mold for cold pressing to form a cold-pressed blank, and then performing covering and sealing on the cold-pressed blank to obtain a pre-pressed blank; step S4, sequentially performing first cold rolling, hot rolling and second cold rolling on the pre-pressed blank to obtain a rolled plate; and step S5, sequentially performing solid solution treatment and aging treatment on the rolled plate to obtain an optical aluminum alloy plate product.

[0007] Further, in the raw ingot, by mass percentage, it further comprises: Si content of 0.30%-1.10%, Fe content of ≤0.15%; Cu content of 0.10%-0.60%, Mn content of ≤0.20%; Mg content of 0.80%-1.20%; Cr content of 0.15%-0.30%, Zn content of ≤0.30%, Ti content of 0.05%-0.15%, Zr content of 0.02%-0.04%, Sc content of 0-0.30%, and the balance being Al and impurities, and the total amount of impurities is less than 0.15%, and the content of each impurity element is less than 0.05%.

[0008] Further, in step S1, the homogenization treatment temperature is 490-560℃, and the holding time is 8-48h.

[0009] Preferably, step S1 further comprises: cutting the head and tail of the ingot after homogenization treatment, and turning the skin.

[0010] Preferably, the length of the cut head and tail is 100-200mm, and the depth of the turned skin is 5-15mm.

[0011] Further, in step S2, the crucible melt temperature of the spinning machine during rapid solidification treatment is 780-850℃; preferably, inert gas is filled into the melting chamber of the spinning machine for protection.

[0012] Preferably, the rotating linear speed of the copper cooling roller of the spinning machine is 10-40m / s, and the cooling water flow is 1000-4000L / h.

[0013] Preferably, the pressure difference of the nozzle is 15-30kPa, and the liquid outflow width is 2.0-30.0mm.

[0014] Further, in step S3, the holding pressure of cold pressing is 200-600MPa, and the holding time is 100-600s.

[0015] And / or, in step S3, the cladding is made of pure aluminum plate, preferably the thickness of the pure aluminum plate is 0.5-4mm, further preferably, the two ends of the pure aluminum plate used for cladding are sealed by arc welding;

[0016] Preferably, the size of the pre-pressed blank is: length≤1000mm, width≤500mm, height≤300mm.

[0017] Further, in step S4, the rolling speed during the first cold rolling is 0.1-3m / s;

[0018] Preferably, the first cold rolling pass is 4-6 times, and the reduction per pass is 3-10%;

[0019] Preferably, the total reduction of the first cold rolling pass is 20%-80%.

[0020] Further, in step S4, the heating temperature during hot rolling is 360-520℃;

[0021] Preferably, the rolling speed is 0.1-5m / s;

[0022] Preferably, the hot rolling pass is 3-8 times, and the reduction per pass is 3-30%, further preferably, the total reduction of the hot rolling is 20%-90%.

[0023] Further, in step S4, the rolling speed during the second cold rolling is 1-10m / s;

[0024] Preferably, the second cold rolling pass is 4-8 times, and the reduction per pass is 3-30%;

[0025] Preferably, the total reduction of the second cold rolling pass is 30%-80%.

[0026] Further, in step S5, the temperature of the solid solution treatment is 490-560℃, and the time is 15-120min;

[0027] And / or, the temperature of the aging treatment is 150-200℃, and the time is 1-8h.

[0028] According to another aspect of the present application, an optical aluminum alloy plate is provided, which is prepared by any of the above preparation methods.

[0029] By using the technical scheme of the application and the rapid solidification technology, component segregation can be reduced, micron-level grain structure can be obtained, and the number of primary crystalline phases is small and the scale is uniform, which is beneficial to preparing plate materials with high optical reflectivity; by using the package cold rolling, the density of the cold-pressed green compact can be improved, and defects such as pores and loose can be eliminated; by using the hot rolling process, metallurgical bonding between the green compact strips can be realized, and the uniformity of the material can be ensured; finally, by using the large deformation cold rolling process, the surface quality can be improved, the deformation dislocation can be reserved, the strength of the finished plate material can be improved, and the strength of the final finished plate material can be improved and the grain is uniform and small, which plays an important role in improving the surface performance of the optical aluminum alloy plate material.

[0030] The application adopts the technical route of'melt spinning-cold pressing-package cold rolling-hot rolling-cold rolling', and can prepare microcrystalline aluminum alloy plate materials for large-scale optical mirrors, the plate materials are uniform in composition, small in grain size, and fine in dispersed precipitated phases, the roughness of the plate materials can reach below Ra3.0 nm after precision machining of the surface, the optical reflectivity is increased, and the plate materials have excellent tensile strength and hardness. BRIEF DESCRIPTION OF DRAWINGS

[0031] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the exemplary embodiments of the application, serve to explain the application, and do not constitute improper limitations on the application. In the drawings:

[0032] Figure 1 It is a process flow chart for the preparation method of the embodiment 1 of the application;

[0033] Figure 2 It is a microcrystalline grain structure of the rapid solidification strip prepared in the embodiment 1 of the application;

[0034] Figure 3 It is a cold-pressed green compact sample prepared in the embodiment 1 of the application;

[0035] Figure 4 It is a TEM structure of the rapid solidification strip prepared in the embodiment 1 of the application;

[0036] Figure 5 It is a TEM structure of the rapid solidification strip prepared in the embodiment 4 of the application;

[0037] Figure 6 It is a metallographic structure of the optical aluminum alloy material prepared in the embodiment 1 of the application;

[0038] Figure 7 It is a metallographic structure of the optical aluminum alloy material prepared in the embodiment 22 of the application;

[0039] Figure 8 It is a cross-sectional grain structure (500x) of the finished material prepared in the embodiment 4 of the application;

[0040] Figure 9 SEM microstructure of a longitudinal section of Example 1 of the present application;

[0041] Figure 10 SEM microstructure of a longitudinal section of Example 21 of the present application. DETAILED DESCRIPTION

[0042] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments.

[0043] As analyzed in the background of the present application, there is a problem in the prior art that it is difficult to prepare an optical aluminum alloy plate material with a large cross-sectional size and high optical reflectivity. In order to solve this problem, the present application provides an optical aluminum alloy plate material and a preparation method thereof.

[0044] According to an embodiment of the present application, a preparation method of an optical aluminum alloy plate material is provided, which comprises the following steps: S1, an original ingot is prepared by using a semi-continuous casting method, and the original ingot is subjected to homogenization treatment to obtain a to-be-processed ingot; S2, the to-be-processed ingot is subjected to rapid solidification treatment by using a single-roll melt spinning method to obtain a rapid solidification alloy strip; S3, the rapid solidification alloy strip is crushed and then loaded into a mold for cold pressing to form a cold-pressed blank, and the cold-pressed blank is subjected to covering and sealing to obtain a pre-pressed blank; S4, the pre-pressed blank is sequentially subjected to first cold rolling, hot rolling and second cold rolling to obtain a rolled plate; and S5, the rolled plate is sequentially subjected to solid solution treatment and aging treatment to obtain a finished optical aluminum alloy plate material.

[0045] The present application first utilizes rapid solidification technology, which can reduce composition segregation, obtain micron-level grain structure, and has a small number of primary crystalline phases and uniform size, which is beneficial to the preparation of a plate material with high optical reflectivity; covering cold rolling can improve the density of the cold-pressed green blank and eliminate defects such as pores and porosity; then, the hot rolling process realizes the metallurgical bonding between the green blank strips and ensures the uniformity of the material; finally, large deformation cold rolling processing improves the surface quality, reserves dislocations, improves the strength of the finished plate material, and ensures that the finished plate material has high strength and fine and uniform grains, which plays an important role in improving the surface performance of the optical aluminum alloy plate material.

[0046] The present application adopts the technical route of "melt spinning-cold pressing-covering cold rolling-hot rolling-cold rolling", which can prepare a large-specification microcrystalline aluminum alloy plate material for optical mirrors, the plate material has uniform composition, fine grains, and dispersed and fine precipitated phases, the roughness of the plate material after precision machining can reach below Ra3.0 nm, the optical reflectivity is increased, and the plate material has excellent tensile strength and hardness.

[0047] To further improve the surface performance and mechanical strength of the aluminum alloy plate, in some embodiments of the present application, the original ingot contains, by mass percentage, Si 0.30-1.10%, Fe ≤0.15%; Cu 0.10-0.60%, Mn ≤0.20%; Mg 0.80-1.20%; Cr 0.15-0.30%, Zn ≤0.30%, Ti 0.05-0.15%, Zr 0.02-0.04%, Sc 0-0.30%, the balance being Al and impurities, and the total amount of impurities being less than 0.15%, and the content of each impurity element being less than 0.05%.

[0048] By designing the composition of the optical aluminum alloy material, the content of the impurity element Fe is reduced, which helps to improve the purity of the aluminum alloy melt, effectively reduces the volume of the insoluble Fe phase in the aluminum matrix, avoids the increase of surface roughness caused by large second phase in the high-precision surface processing of the finished material, and ensures the surface smoothness of the optical aluminum material. On the other hand, by optimizing the composition content of the main alloying elements Si and Mg on the basis of the conventional Al-Mg-Si aluminum alloy material composition, the atomic ratio and size of the precipitated phase are controlled to ensure the size stability of the nanometer precipitated phase of the finished material. In addition, by accurately controlling the content of Mn element, it is beneficial to promote the transformation of the alloy from AlFeSi phase to AlFeMnSi phase. On this basis, trace alloying elements such as Cr, Ti and Zr are added to improve the surface activity between the alloy phase boundaries and the hardness of the aluminum matrix, and to improve the yield of mirror surface precision processing of the material.

[0049] Typically but not limitedly, the content of Si in the aluminum alloy ingot can be listed as 0.30%, 0.35%, 0.40%, 0.45%, 0.50%, 0.55%, 0.60%, 0.65%, 0.70%, 0.75%, 0.80%, 0.85%, 0.90%, 0.95%, 1.0%, 1.05%, 1.10% or any range between any two of them, by mass percentage.

[0050] Typically but not limitedly, the content of Fe in the aluminum alloy ingot can be listed as 0.15%, 0.12%, 0.10%, 0.08%, 0.06%, 0.04%, 0.02%, 0 or any range between any two of them, by mass percentage.

[0051] Typically but not limitedly, the content of Cu in the aluminum alloy ingot can be listed as 0.10%, 0.15%, 0.20%, 0.25%, 0.30%, 0.35%, 0.40%, 0.45%, 0.50%, 0.55%, 0.60% or any range between any two of them, by mass percentage.

[0052] Typically but not exclusively, the content of Mn in the aluminium alloy ingot described above can be cited as 0.20%, 0.18%, 0.16%, 0.14%, 0.15%, 0.12%, 0.10%, 0.08%, 0.06%, 0.04%, 0.02%, 0 or a range between any two of them, in mass percentage.

[0053] Typically but not exclusively, the content of Mg in the aluminium alloy ingot described above can be cited as 0.80%, 0.85%, 0.90%, 0.95%, 1.00%, 1.05%, 1.10%, 1.15%, 1.20% or a range between any two of them, in mass percentage.

[0054] Typically but not exclusively, the content of Cr in the aluminium alloy ingot described above can be cited as 0.15%, 0.18%, 0.20%, 0.22%, 0.25%, 0.27%, 0.30% or a range between any two of them, in mass percentage.

[0055] Typically but not exclusively, the content of Zn in the aluminium alloy ingot described above can be cited as 0, 0.05%, 0.08%, 0.10%, 0.13%, 0.15%, 0.18%, 0.20%, 0.22%, 0.25%, 0.27%, 0.30% or a range between any two of them, in mass percentage.

[0056] Typically but not exclusively, the content of Ti in the aluminium alloy ingot described above can be cited as 0.05%, 0.08%, 0.10%, 0.13%, 0.15% or a range between any two of them, in mass percentage.

[0057] Typically but not exclusively, the content of Zr in the aluminium alloy ingot described above can be cited as 0.02%, 0.025%, 0.03%, 0.035%, 0.04% or a range between any two of them, in mass percentage.

[0058] Typically but not exclusively, the content of Sc in the aluminium alloy ingot described above can be cited as 0, 0.02%, 0.04%, 0.06%, 0.08%, 0.10%, 0.12%, 0.14%, 0.16%, 0.18%, 0.20%, 0.22%, 0.25%, 0.27%, 0.30% or a range between any two of them, in mass percentage.

[0059] The implementation of the semi-continuous casting described above can refer to the prior art, and no special requirement is made by the present application, which will not be described in detail herein.

[0060] The homogenization treatment can improve the uniformity of the microstructure of the original ingot, and is beneficial to the subsequent process and improves the mechanical properties of the aluminum alloy plate. In some embodiments of the present application, in order to further improve the effect of the homogenization treatment, the temperature of the homogenization treatment is 490-560℃, and the holding time is 8-48h.

[0061] In some embodiments of the present application, in order to further improve the surface properties of the aluminum alloy, the above step S1 further comprises: cutting the head and tail of the homogenized ingot, and turning the skin; preferably, the length of the cut head and tail is 100-200mm, and the depth of the turned skin is 5-15mm, which is good for improving the surface properties and mechanical properties of the aluminum alloy.

[0062] In the above step S2, the single-roller melt spinning method is used for rapid solidification treatment of the ingot, wherein "rapid solidification" refers to that when the molten ingot to be processed contacts the rapidly rotating cooling roller, the temperature rapidly decreases, and the prepared metal strip has micron-level microstructure, and the number of primary crystalline phases is small and the size is uniform after subsequent densification processing.

[0063] In some embodiments of the present application, the crucible melt temperature of the spinning machine during rapid solidification treatment is 780-850℃, which can improve the surface smoothness of the finished aluminum alloy, and prepare a rapid solidification strip with smoother surface and more uniform thickness.

[0064] In some preferred embodiments of the present application, in order to prevent the oxidizing gas in the air from adversely affecting the high-temperature alloy, inert gas is filled into the melting chamber of the spinning machine for protection, and the inert gas includes but is not limited to any one or more of nitrogen, argon and helium.

[0065] In some preferred embodiments of the present application, the rotating linear speed of the copper cooling roller of the spinning machine is 10-40m / s, and the cooling water flow is 1000-4000L / h, and by selecting appropriate cooling roller rotating linear speed and cooling water flow, the surface smoothness and thickness uniformity of the rapid solidification strip are further improved. Preferably, the nozzle pressure difference is 15-30kPa, and the liquid outflow width is 2.0-30.0mm, which is beneficial to prepare a rapid solidification alloy strip with smoother surface and more uniform thickness.

[0066] In some embodiments of the present application, in the above step S2, the prepared strip has a thickness of 15-100μm and a width of 2.0-30.0mm.

[0067] In step S3, the prepared rapid solidification alloy strip is first crushed, such as by using a shearing machine, and the crushed alloy material is loaded into a mold for cold pressing to form a blank. In some embodiments of the present application, the holding pressure for cold pressing is 200-600 MPa, and the holding time is 100-600 s, which is good for cold pressing and facilitates the subsequent rolling process, further improving the surface finish of the finished aluminum alloy plate.

[0068] In some embodiments of the present application, in order to prevent material loosening during subsequent cold rolling and improve material density, the cold-pressed blank is wrapped with a pure aluminum plate. Preferably, the thickness of the pure aluminum plate is 0.5-4 mm, and further preferably, the ends of the pure aluminum plate used for wrapping are sealed by arc welding to further improve the mechanical properties of the blank and reduce defects.

[0069] In some typical embodiments of the present application, the pre-pressed blank obtained by the above wrapping and sealing treatment has the following specifications: length ≤1000 mm, width ≤500 mm, and height ≤300 mm.

[0070] In step S4, the pre-pressed blank is sequentially subjected to first cold rolling, hot rolling, and second cold rolling to obtain an aluminum alloy plate. The first cold rolling improves the density of the cold-pressed green body, eliminates defects such as pores and porosity, and makes it possible to be in a good state during subsequent hot rolling, avoiding fragmentation and improving the mechanical properties of the aluminum alloy product.

[0071] In some embodiments of the present application, the rolling speed during the first cold rolling is 0.1-3 m / s; preferably, the number of passes for the first cold rolling is 4-6, and the reduction per pass is 3-10%, which is more effective for improving the density of the alloy material; preferably, the total reduction of the first cold rolling is 20%-80%, more preferably 20%-60%, which is more effective for improving the density of the aluminum alloy and further reducing the occurrence of defects such as pores and porosity.

[0072] After the first cold rolling of the alloy material is completed, the outer wrapping is removed and subsequent hot rolling is performed.

[0073] In some embodiments of the present application, the heating temperature during hot rolling is 360-520°C, which is conducive to promoting the uniformity of the alloy material; for example, the heating temperature during hot rolling is 370°C, 380°C, 390°C, 400°C, 410°C, 420°C, 430°C, 440°C, 450°C, 460°C, 470°C, 480°C, 490°C, 500°C, 510°C, 520°C, or any range between any two of them. Preferably, the rolling speed is 0.1-5 m / s, which is conducive to the metallurgical bonding between the green strip materials. Preferably, the hot rolling pass is 3-8 times, and the reduction per pass is 3-30%, which is more obvious for improving the uniformity of the alloy material; preferably, the hot rolling pass is 4-8 times, and the reduction per pass is 5-25%, which is more obvious for improving the uniformity of the alloy material. Preferably, the total reduction of hot rolling is 20-90%, and more preferably, the total reduction of hot rolling is 40-80%, and the comprehensive performance of the aluminum alloy material obtained by rolling is better.

[0074] In some embodiments of the present application, the rolling speed during the second cold rolling is 1-10 m / s, which is conducive to further improving the surface quality and the strength of the finished product. Preferably, the second cold rolling pass is 4-8 times, and the reduction per pass is 3-30%, which can make the grains more uniform and small, and improve the strength of the plate; more preferably, the second cold rolling pass is 6-8 times, and the reduction per pass is 20-30%, which is more obvious for improving the strength of the plate. In some preferred embodiments of the present application, the total reduction of the second cold rolling pass is 30-80%, which is more obvious for improving the surface performance of the optical aluminum alloy plate.

[0075] The specific method of the solid solution treatment and the aging treatment in the above step S5 can refer to the prior art.

[0076] In some embodiments of the present application, in order to better eliminate the internal stress of the aluminum alloy plate after the above treatment, and obtain a suitable grain size, the solid solution treatment temperature is 490-560°C, and the time is 15-120 min, which can further improve the mechanical strength of the plate.

[0077] In some embodiments of the present application, the aging treatment temperature is 150-200°C, and the time is 1-8 h, which is conducive to better eliminating the residual stress of the plate, stabilizing the grain size, and thus improving the mechanical properties of the finished optical aluminum alloy plate.

[0078] According to another typical embodiment of the present application, an optical aluminum alloy plate is provided, which is prepared by any of the above preparation methods.

[0079] The optical aluminum alloy plate of the present application is prepared by the technical route of "melt spinning-cold pressing-coated cold rolling-hot rolling-cold rolling", has uniform composition, fine grains, and dispersed fine precipitated phase, and after precision machining of the surface, the roughness can reach below Ra3.0 nm, the optical reflectivity is increased, and meanwhile, the optical aluminum alloy product has excellent tensile strength and hardness, and can be obtained by single-point diamond precision turning, precision polishing technology and other means, and the surface roughness of the optical aluminum alloy product is less than Ra3.0 nm, and the optical aluminum alloy product can be used to manufacture large-specification optical mirrors.

[0080] The beneficial effects that can be achieved by the present application will be further illustrated below in combination with examples.

[0081] Example 1

[0082] A large-specification optical aluminum alloy plate and a preparation method thereof, and a process flow thereof is as shown in Figure 1

[0083] The alloy raw material comprises the following components in percentage by mass: Si: 0.72%; Fe: 0.063%; Cu: 0.33%, Mn: 0.069%; Mg: 0.92%; Cr: 0.24%, Zn: 0.13%, Ti: 0.11%; Zr: 0.03%, Sc: 0%, and the balance is Al and impurities. The above composition raw ingot is prepared by semi-continuous casting, and the ingot is homogenized at 520℃ for 24h, and after cutting the head and tail by 150mm and turning the skin by 5mm, the ingot is added into a single-roll tape caster for rapid solidification ribbon preparation, the vacuum degree of the melting chamber is 2x10 - 3 Pa, and argon gas is introduced for protection; the melt temperature in the intermediate frequency heating crucible is 820℃, the rotating linear speed of the copper cooling roller is 18m / s, the cooling water flow is 2000L / h, the nozzle pressure difference is 20kPa, the liquid outflow width is 10.0mm, the prepared ribbon thickness is 40-80μm, the ribbon width is 7.0-16.0mm, the microstructure of the grains is as shown in Figure 2 , and the TEM structure is as shown in Figure 4 ; after the solidified ribbon is mechanically sheared, the solidified ribbon is loaded into a pre-prepared mold for cold pressing, the holding pressure is 200MPa, and the pressure holding time is 100s, and a cold pressing blank with a length of 300mm, a width of 200mm, and a height of 200mm is prepared, and the cold pressing green sample is as shown in Figure 3 ​The cold-pressed blank is then wrapped with a 2mm-thick pure aluminum plate and welded to seal, followed by 4 passes of cold rolling at a rolling speed of 0.5m / s, a cold rolling reduction of 6% per pass, and a total reduction of 22%. After unwrapping, hot rolling is performed at a heating temperature of 480℃, a rolling speed of 1m / s, 4 rolling passes, and a reduction of 15% per pass. The material is then cold rolled for 5 passes at a rolling speed of 2m / s, a reduction of 20% per pass, and a total reduction of 67%. Finally, the cold-rolled plate is subjected to solid solution and aging treatment at a solid solution temperature of 520℃ for 60min, and an aging temperature of 175℃ for 2h.

[0084] The metallographic structure of the finished product is shown in Figure 6 , and the longitudinal section SEM structure is shown in Figure 9 .

[0085] Example 2

[0086] The alloy raw material includes the following components by mass percentage: Si: 0.63%; Fe: 0.072%; Cu: 0.28%, Mn: 0.05%; Mg: 0.85%; Cr: 0.22%, Zn: 0.15%, Ti: 0.08%; Zr: 0.03%, Sc: 0%, and the balance of Al and impurities. The raw ingot with the above composition is prepared by semi-continuous casting, and the ingot is homogenized at 520℃ for 24h, and after cutting off the head and tail by 150mm and turning the skin by 5mm, it is added into a single-roll tape caster for rapid solidification ribbon preparation, with a melting chamber vacuum degree of 2x10 -3 Pa and argon gas protection; the melt temperature in the intermediate frequency heating crucible is 820℃, the copper cooling roller rotating linear speed is 18m / s, the cooling water flow is 2000L / h, the nozzle pressure difference is 20kPa, the liquid outflow width is 10.0mm, the prepared ribbon thickness is 40-80μm, and the ribbon width is 7.0-16.0mm; after the solidified ribbon is mechanically sheared and crushed, it is loaded into a pre-prepared mold for cold pressing, with a holding pressure of 200MPa and a holding time of 100s, to form a cold-pressed blank with a length of 300mm, a width of 200mm, and a height of 200mm; the cold-pressed blank is then wrapped with a 2mm-thick pure aluminum plate and welded to seal, followed by 4 passes of cold rolling at a rolling speed of 0.5m / s, a cold rolling reduction of 6% per pass, and a total reduction of 22%. After unwrapping, hot rolling is performed at a heating temperature of 480℃, a rolling speed of 1m / s, 4 rolling passes, and a reduction of 15% per pass. The material is then cold rolled for 5 passes at a rolling speed of 2m / s, a reduction of 20% per pass, and a total reduction of 67%. Finally, the cold-rolled plate is subjected to solid solution and aging treatment at a solid solution temperature of 520℃ for 60min, and an aging temperature of 175℃ for 2h.

[0087] Example 3

[0088] The alloy raw material includes the following components by mass percent: Si: 0.70%; Fe: 0.068%; Cu: 0.32%, Mn: 0.071%; Mg: 0.90%; Cr: 0.21%, Zn: 0.16%, Ti: 0.11%; Zr: 0.02%, Sc: 0.05%, and the balance of Al and impurities. The original ingot with the above components is prepared by semi-continuous casting, and the ingot is homogenized at 500°C for 24h, and after cutting the head and tail by 180mm and turning the skin by 5mm, the ingot is added into a single-roller strip caster for rapid solidification strip preparation, the vacuum degree of the melting chamber is 2x10 - 3 Pa, and argon gas is introduced for protection; the temperature of the melt in the intermediate frequency heating crucible is 810°C, the rotating linear speed of the copper cooling roller is 18m / s, the cooling water flow is 1800L / h, the nozzle pressure difference is 20kPa, the liquid outflow width is 10.0mm, the prepared strip thickness is 40-80μm, and the strip width is 7.0-16.0mm; after the solidified strip is mechanically sheared, the solidified strip is loaded into a pre-prepared mold for cold pressing, the holding pressure is 200MPa, and the holding time is 100s, and a cold-pressed blank with a length of 300mm, a width of 200mm, and a height of 180mm is prepared; the cold-pressed blank is then wrapped with a pure aluminum plate with a thickness of 2mm and welded to be sealed, and then cold-rolled in 4 passes, the rolling speed is 0.5m / s, the reduction per pass is 8%, and the total reduction is 28%; after unwrapping, hot rolling is performed, the heating temperature is 460°C, the rolling speed is 1.2m / s, the rolling passes are 4, the reduction per pass is 20%, and the total reduction is 67%; finally, the cold-rolled plate is subjected to solid solution and aging treatment, the solid solution temperature is 530°C, the solid solution time is 60min, the aging temperature is 175°C, and the aging time is 2h.

[0089] Example 4

[0090] The alloy raw material includes the following components by mass percent: Si: 0.59%; Fe: 0.048%; Cu: 0.34%, Mn: 0.08%; Mg: 0.88%; Cr: 0.22%, Zn: 0.11%, Ti: 0.06%; Zr: 0.02%, Sc: 0.15%, and the balance of Al and impurities. The original ingot with the above components is prepared by semi-continuous casting, and the ingot is homogenized at 500°C for 36h, and after cutting the head and tail by 160mm and turning the skin by 5mm, the ingot is added into a single-roller strip caster for rapid solidification strip preparation, the vacuum degree of the melting chamber is 2x10 - 3Pa, and argon was introduced for protection; the temperature of the melt in the crucible was 810°C under the medium frequency heating, the rotating linear velocity of the copper cooling roller was 18 m / s, the cooling water flow was 1800 L / h, the nozzle pressure difference was 20 kPa, the liquid outflow width was 10.0 mm, the prepared strip thickness was 40-80 μm, the strip width was 7.0-16.0 mm, and the TEM structure thereof was as shown in Figure 5 After the solidified strip was mechanically sheared and cut, the cold-pressed blank with a length of 300 mm, a width of 200 mm, and a height of 180 mm was prepared by loading the solidified strip into a pre-prepared mold under a holding pressure of 200 MPa for 100 s; the cold-pressed blank was then wrapped with a pure aluminum plate with a thickness of 2 mm and welded to seal, followed by 4 passes of cold rolling at a rolling speed of 0.5 m / s, a cold rolling reduction of 8% per pass, and a total reduction of 28%; after unwrapping, hot rolling was performed at a heating temperature of 460°C, a rolling speed of 1.2 m / s, 4 rolling passes, a reduction of 20% per pass, and a total reduction of 67%; finally, the cold-rolled plate was subjected to solid solution and aging treatment at a solid solution temperature of 530°C for 60 min and an aging temperature of 175°C for 2 h.

[0091] The cross-sectional grain structure (500x) of the finished aluminum alloy material is as shown in Figure 8 .

[0092] Example 5

[0093] The alloy raw material includes the following components by mass percentage: Si: 0.59%; Fe: 0.048%; Cu: 0.34%, Mn: 0.08%; Mg: 0.88%; Cr: 0.22%, Zn: 0.11%, Ti: 0.06%; Zr: 0.02%, Sc: 0.15%, and the balance of Al and impurities. The raw ingot with the above components was prepared by semi-continuous casting, and the ingot was homogenized at 500°C for 36 h, and after the head and tail of 200 mm and the skin of 5 mm were removed, it was added to a single-roll strip caster for rapid solidification strip preparation, the vacuum degree of the melting chamber was 2x10 - 3Pa, and argon gas was introduced for protection; the temperature of the melt in the crucible was 830°C under the medium frequency heating, the rotating linear velocity of the copper cooling roller was 20 m / s, the cooling water flow was 2200 L / h, the pressure difference of the nozzle was 20 kPa, the liquid outflow width was 10.0 mm, the thickness of the prepared strip was 40-80 μm, and the width of the strip was 7.0-16.0 mm; the solidified strip was mechanically sheared and then was loaded into a pre-prepared mold for cold pressing, the holding pressure was 200 MPa, the holding time was 100 s, and a cold-pressed blank with a length of 300 mm, a width of 200 mm, and a height of 300 mm was prepared; the cold-pressed blank was then wrapped with a pure aluminum plate with a thickness of 2 mm and was welded to seal, and then 5 passes of cold rolling were performed at a rolling speed of 0.5 m / s, the reduction of each pass was 8%, and the total reduction was 34%; after unwrapping, hot rolling was performed at a heating temperature of 480°C and a rolling speed of 0.8 m / s, and 6 passes of rolling were performed, the reduction of each pass was 15%; the material was then cold rolled for 6 passes at a rolling speed of 2 m / s, the reduction of each pass was 25%, and the total reduction was 82%; finally, the cold-rolled plate was subjected to solid solution and aging treatment, the solid solution temperature was 530°C, the solid solution time was 60 min, the aging temperature was 175°C, and the aging time was 2 h.

[0094] Example 6

[0095] The alloy raw material included the following components by mass percentage: Si: 0.63%; Fe: 0.056%; Cu: 0.31%, Mn: 0.08%; Mg: 0.91%; Cr: 0.20%, Zn: 0.13%, Ti: 0.08%, Zr: 0.02%, Sc: 0.04%, and the balance of Al and impurities. The above component raw ingot was prepared by semi-continuous casting, and the ingot was homogenized at 500°C for 36 h, and after the head and tail of 150 mm and the skin of 5 mm were cut, the ingot was added into a single-roller strip caster for rapid solidification strip preparation, the vacuum degree of the melting chamber was 2x10 - 3Pa, and argon gas was introduced for protection; the temperature of the melt in the crucible was 830°C under the medium frequency heating, the rotating linear velocity of the copper cooling roller was 20 m / s, the cooling water flow was 2200 L / h, the pressure difference of the nozzle was 20 kPa, the liquid outflow width was 10.0 mm, the thickness of the prepared strip was 40-80 μm, and the width of the strip was 7.0-16.0 mm; after the solidified strip was mechanically sheared and crushed, the solidified strip was loaded into a pre-prepared mold for cold pressing, the holding pressure was 200 MPa, and the holding time was 100 s, thus a cold-pressed blank with a length of 500 mm, a width of 400 mm, and a height of 300 mm was prepared; the cold-pressed blank was then sleeved with a pure aluminum plate with a thickness of 3 mm and was welded and sealed, and then 6 passes of cold rolling were performed at a rolling speed of 0.3 m / s, the reduction of each pass was 10%, and the total reduction was 47%; after the sleeve was removed, hot rolling was performed at a heating temperature of 480°C and a rolling speed of 0.6 m / s, 6 passes of rolling were performed, and the reduction of each pass was 20%; the material was then cold-rolled for 5 passes at a rolling speed of 2.5 m / s, the reduction of each pass was 20%, and the total reduction was 67%; finally, the cold-rolled plate was subjected to solid solution and aging treatment, the solid solution temperature was 520°C, the solid solution time was 60 min, the aging temperature was 175°C, and the aging time was 2 h.

[0096] Example 7

[0097] The alloy raw material comprises the following components in percentage by mass: Si: 0.72%; Fe: 0.063%; Cu: 0.33%, Mn: 0.069%; Mg: 0.92%; Cr: 0.24%, Zn: 0.13%, Ti: 0.11%; Zr: 0.03%, Sc: 0%, and the balance is Al and impurities. The original ingot with the above components was prepared by semi-continuous casting, and the ingot was subjected to homogenization at 520°C for 24 h, and after the head and tail of 160 mm and the skin of 5 mm were removed, the ingot was added into a single-roller strip caster for rapid solidification strip preparation, the vacuum degree of the melting chamber was 2x10 - 3Pa, and argon was introduced for protection; the temperature of the melt in the crucible was 820°C under the medium frequency heating, the rotating linear velocity of the copper cooling roller was 25 m / s, the cooling water flow was 3000 L / h, the pressure difference of the nozzle was 20 kPa, the liquid outflow width was 10.0 mm, the thickness of the prepared strip was 30-60 μm, and the width of the strip was 7.0-16.0 mm; the solidified strip was mechanically sheared and then was loaded into a prepared mold for cold pressing under a holding pressure of 200 MPa for 100 s to form a cold-pressed blank with a length of 300 mm, a width of 200 mm, and a height of 200 mm; the cold-pressed blank was then wrapped with a pure aluminum plate with a thickness of 2 mm and was welded to seal the opening, and then was cold-rolled for 4 passes at a rolling speed of 0.5 m / s, a cold-rolling reduction of 6% per pass, and a total reduction of 22%; after unwrapping, the material was hot-rolled at a heating temperature of 480°C, a rolling speed of 1 m / s, 4 rolling passes, and a reduction of 15% per pass; the material was then cold-rolled for 5 passes at a rolling speed of 2 m / s, a cold-rolling reduction of 20% per pass, and a total reduction of 67%; and finally, the cold-rolled plate was subjected to solid solution and aging treatment at a solid solution temperature of 520°C for 60 min, an aging temperature of 175°C, and an aging time of 2 h.

[0098] Example 8

[0099] The difference from Example 1 is that the mass percentage of Si in the alloy raw material is 0.30%.

[0100] Example 9

[0101] The difference from Example 1 is that the mass percentage of Si in the alloy raw material is 1.1%.

[0102] Example 10

[0103] The difference from Example 1 is that the mass percentage of Mg in the alloy raw material is 1.20%.

[0104] Example 11

[0105] The difference from Example 1 is that the rotating linear velocity of the copper cooling roller is 12 m / s.

[0106] Example 12

[0107] The difference from Example 1 is that the rotating linear velocity of the copper cooling roller is 38 m / s.

[0108] Example 13

[0109] The difference from Example 1 is that after sealing the opening by welding, the material is cold-rolled for 2 passes at a rolling speed of 0.5 m / s, a cold-rolling reduction of 12% per pass, and a total reduction of 22%.

[0110] Example 14

[0111] The difference from Example 1 is that after welding the seal, 6 passes of cold rolling are performed at a rolling speed of 0.5 m / s, with a reduction of 3% per pass and a total reduction of 17.5%.

[0112] Example 15

[0113] The difference from Example 1 is that the heating temperature during hot rolling is 360°C.

[0114] Example 16

[0115] The difference from Example 1 is that the heating temperature during hot rolling is 520°C.

[0116] Example 17

[0117] The difference from Example 1 is that the heating temperature during hot rolling is 600°C.

[0118] Example 18

[0119] The difference from Example 1 is that during hot rolling, 3 passes are performed with a reduction of 15% per pass.

[0120] Example 19

[0121] The difference from Example 1 is that after hot rolling, the material is cold rolled 3 passes at a rolling speed of 2 m / s, with a reduction of 30% per pass and a total reduction of 51%.

[0122] Example 20

[0123] The difference from Example 1 is that after hot rolling, the material is cold rolled 8 passes at a rolling speed of 2 m / s, with a reduction of 5% per pass and a total reduction of 43%.

[0124] Example 21

[0125] The alloy raw material includes the following components by mass percentage: Si: 0.72%; Fe: 0.059%; Cu: 0.34%, Mn: 0.065%; Mg: 0.89%; Cr: 0.24%, Zn: 0.13%, Ti: 0.11%; Zr: 0.03%, Sc: 0%, and the balance being Al and impurities. The raw ingot of the above components is prepared by semi-continuous casting, and the ingot is homogenized at 520°C for 24 h, after which the head and tail are cut off and the skin is turned to 5 mm, and then added to a single-roller strip caster for rapid solidification strip preparation, with a melting chamber vacuum of 2 x 10 -3Pa, and argon gas was introduced for protection; the temperature of the melt in the crucible was heated by medium frequency to 820°C, the rotating linear velocity of the copper cooling roller was 18 m / s, the cooling water flow was 2000 L / h, the nozzle pressure difference was 20 kPa, the liquid outflow width was 10.0 mm, the prepared strip thickness was 40-80 μm, and the strip width was 7.0-16.0 mm; after the solidified strip was mechanically sheared and crushed, it was loaded into a pre-prepared mold for cold pressing, the holding pressure was 200 MPa, the holding time was 100 s, the cold-pressed blank with a length of 300 mm, a width of 200 mm, and a height of 200 mm was prepared; the cold-pressed blank was then sleeved with a pure aluminum plate with a thickness of 2 mm and welded to seal, and then 4 passes of cold rolling were performed at a rolling speed of 0.5 m / s, the cold rolling reduction of each pass was 3%, and the total reduction was 11.5%; after the sleeve was removed, hot rolling was performed at a heating temperature of 480°C and a rolling speed of 1 m / s, and the rolling passes were 4, the reduction of each pass was 15%; the material was then cold rolled for 5 passes at a rolling speed of 2 m / s, the reduction of each pass was 20%, and the total reduction was 67%; finally, the cold-rolled plate was subjected to solid solution and aging treatment, the solid solution temperature was 520°C, the solid solution time was 60 min, the aging temperature was 175°C, and the aging time was 2 h.

[0126] The longitudinal section SEM structure of the prepared finished product is shown in Figure 10 .

[0127] Example 22

[0128] The alloy raw material includes the following components by mass percentage: Si: 0.71%; Fe: 0.48%; Cu: 0.32%, Mn: 0.072%; Mg: 0.90%; Cr: 0.22%, Zn: 0.11%, Ti: 0.08%; Zr: 0.03%, Sc: 0%, and the balance is Al and impurities. The original ingot with the above components was prepared by semi-continuous casting, and the ingot was homogenized at 520°C for 24 h, and after the head and tail were cut and the skin was removed by 5 mm, it was added into a single-roll strip caster for rapid solidification strip preparation, the vacuum degree of the melting chamber was 2x10 -3Pa, and argon was introduced for protection; the temperature of the melt in the crucible was 820°C under the medium frequency heating, the rotating linear velocity of the copper cooling roller was 18 m / s, the cooling water flow was 2000 L / h, the pressure difference of the nozzle was 20 kPa, the liquid outflow width was 10.0 mm, the thickness of the prepared strip was 40-80 μm, and the width of the strip was 7.0-16.0 mm; the solidified strip was mechanically sheared into pieces and then was loaded into a prepared mold for cold pressing under a holding pressure of 200 MPa for 100 s to form a cold-pressed blank with a length of 300 mm, a width of 200 mm, and a height of 200 mm; the cold-pressed blank was then wrapped with a pure aluminum plate with a thickness of 2 mm and was welded to seal the plate, and then was cold-rolled for 4 passes at a rolling speed of 0.5 m / s, a reduction of 6% for each pass, and a total reduction of 22%; after unwrapping, the material was hot-rolled at a heating temperature of 480°C, a rolling speed of 1 m / s, 4 rolling passes, and a reduction of 15% for each pass; the material was then cold-rolled for 5 passes at a rolling speed of 2 m / s, a reduction of 20% for each pass, and a total reduction of 67%; and finally, the cold-rolled plate was subjected to solid solution and aging treatment at a solid solution temperature of 520°C for 60 min, and an aging temperature of 175°C for 2 h.

[0129] Compared with Example 1, the alloy raw material was industrial pure aluminum, and the prepared alloy ingot had a Fe content of 0.48%, which was much higher than the Fe content (0.063%) of the alloy in Example 1. The cross-sectional metallographic structure of the prepared finished material is shown in FIG. 2. As can be seen, there are many large Fe-containing phases in the prepared finished material, which reduces the uniformity of the material. Figure 7

[0130] Example 23

[0131] The alloy raw material included the following components by mass percentage: Si: 0.72%; Fe: 0.063%; Cu: 0.33%, Mn: 0.069%; Mg: 0.92%; Cr: 0.24%, Zn: 0.13%, Ti: 0.11%; Zr: 0.03%, Sc: 0%, and the balance being Al and impurities. The raw ingot with the above components was prepared by semi-continuous casting, and the ingot was homogenized at 420°C for 24 h, and after the head and tail were cut and the skin was removed by 5 mm, the ingot was introduced into a single-roller strip caster for rapid solidification strip preparation, the vacuum degree of the melting chamber was 2x10 -3 ​Pa, and argon gas was introduced for protection; the temperature of the melt in the crucible was heated by medium frequency to 820°C, the rotating linear velocity of the copper cooling roller was 18 m / s, the cooling water flow was 2000 L / h, the pressure difference of the nozzle was 20 kPa, the liquid outflow width was 10.0 mm, the thickness of the prepared strip was 40-80 μm, and the width of the strip was 7.0-16.0 mm; after the solidified strip was mechanically sheared and crushed, the solidified strip was loaded into a pre-prepared mold for cold pressing, the holding pressure was 200 MPa, the holding time was 100 s, a cold-pressed blank with a length of 300 mm, a width of 200 mm, and a height of 200 mm was prepared; the cold-pressed blank was then sleeved with a pure aluminum plate with a thickness of 2 mm and was welded and sealed, and then 4 passes of cold rolling were performed at a rolling speed of 0.5 m / s, the reduction of each pass of cold rolling was 6%, and the total reduction was 22%; after the sleeve was removed, hot rolling was performed at a heating temperature of 480°C and a rolling speed of 1 m / s, and the rolling passes were 4, the reduction of each pass was 15%; the material was then cold-rolled for 5 passes at a rolling speed of 2 m / s, the reduction of each pass was 20%, and the total reduction was 67%; finally, the cold-rolled plate was subjected to solid solution and aging treatment, the solid solution temperature was 520°C, the solid solution time was 60 min, the aging temperature was 175°C, and the aging time was 2 h.

[0132] Example 24

[0133] The alloy raw material includes the following components by mass percentage: Si: 0.72%; Fe: 0.063%; Cu: 0.33%, Mn: 0.069%; Mg: 0.92%; Cr: 0.24%, Zn: 0.13%, Ti: 0.11%; Zr: 0.03%, Sc: 0%, and the balance is Al and impurities. The raw ingot with the above components was prepared by semi-continuous casting, and the ingot was homogenized at 520°C for 24 h, and after the head and tail were cut and the skin was removed by 5 mm, the ingot was added into a single-roll strip caster for rapid solidification strip preparation, the vacuum degree of the melting chamber was 2x10 -3Pa, and argon gas was introduced for protection; the temperature of the melt in the crucible was heated by medium frequency to 820°C, the rotating linear speed of the copper cooling roller was 18 m / s, the cooling water flow was 2000 L / h, the pressure difference of the nozzle was 20 kPa, the liquid outflow width was 10.0 mm, the thickness of the prepared strip was 40-80 μm, and the width of the strip was 7.0-16.0 mm; after the solidified strip was mechanically sheared, it was loaded into a previously prepared mold for cold pressing, the holding pressure was 200 MPa, the holding time was 100 s, and a cold-pressed blank with a length of 300 mm, a width of 200 mm, and a height of 200 mm was prepared; the cold-pressed blank was then wrapped with a pure aluminum plate with a thickness of 2 mm and welded to seal, and then 4 passes of cold rolling were performed at a rolling speed of 0.5 m / s, with a reduction of 6% per pass and a total reduction of 22%; after unwrapping, hot rolling was performed at a heating temperature of 320°C and a rolling speed of 1 m / s, with 4 rolling passes and a reduction of 15% per pass; the material was then cold rolled for 5 passes at a rolling speed of 2 m / s, with a reduction of 20% per pass and a total reduction of 67%; finally, the cold-rolled plate was subjected to solid solution and aging treatment, with a solid solution temperature of 520°C, a solid solution time of 60 min, an aging temperature of 175°C, and an aging time of 2 h.

[0134] The aluminum alloy finished product obtained in the above example was tested, and the testing method was as follows:

[0135] Grain size test: the finished product material was made into a smooth metallographic sample, which was mechanically ground and polished, then anodized, observed under a metallographic microscope, and photographed, and then the average grain size was measured according to the straight-line intercept method of GB / T 6394-2002.

[0136] Surface roughness test after fine polishing: the finished product material with the corresponding diameter was taken, mechanically turned, precisely turned on a single-point diamond lathe, and the surface roughness of the precisely turned surface was tested using a high-precision roughness meter.

[0137] Surface reflectivity test after fine polishing: the sample after single-point diamond turning was measured for mirror reflectivity using an optical detector.

[0138] The test results of the above indexes are shown in Table 1 below.

[0139] Table 1

[0140] Test Example Average crystal grain size / μm Polished surface roughness / Ra Specular reflectance / % Example 1 46 2.9 97.3 Example 2 48 2.8 98.2 Example 3 23 2.4 99.1 Example 4 7.9 2.3 99.1 Example 5 6.8 2.2 99.1 Example 6 34 2.7 98 Example 7 44 2.8 98 Example 8 53 3.1 96.5 Example 9 43 3.0 96.8 Example 10 41 3.1 97.1 Example 11 48 3.0 97.1 Example 12 42 2.6 97.7 Example 13 48 6.5 92.1 Example 14 46 6.8 91.3 Example 15 42 3.2 96.8 Example 16 47 3.0 97.3 Example 17 56 8.7 92.1 Example 18 47 3.0 97.0 Example 19 44 2.7 97.5 Example 20 53 3.4 96.2 Example 21 52 8.3 83.2 Example 22 49 7.3 87.6 Example 23 44 6.3 92.1 Example 24 58 12.3 80.2

[0141] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects: by using the rapid solidification technology, the component segregation can be reduced, the micron-level grain structure can be obtained, and the number of primary crystalline phases is small and the size is uniform, which is beneficial to the preparation of the plate with high optical reflectivity; by the cladding cold rolling, the density of the cold-pressed green compact can be improved, and the defects such as pores and loose can be eliminated; then by the hot rolling process, the metallurgical bonding between the green compact strips is realized, and the uniformity of the material is ensured; finally by the large deformation cold rolling process, the surface quality is improved, the deformation dislocation is reserved, the strength of the finished plate is improved, and the strength of the final finished plate is improved and the grain is uniform and small, which plays an important role in improving the surface performance of the optical aluminum alloy plate. The present application adopts the technical route of "melt spinning-cold pressing-cladding cold rolling-hot rolling-cold rolling", and can prepare the microcrystalline aluminum alloy plate for large-size optical reflector, the plate has uniform composition, small grain size, and dispersed small precipitated phase, and after precision machining of the surface, the roughness can reach below Ra3.0nm, the optical reflectivity is increased, and the plate also has excellent tensile strength and hardness.

[0142] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing an optical aluminum alloy sheet, characterized in that, include: Step S1: Prepare the original ingot using a semi-continuous casting method, and homogenize the original ingot to obtain the ingot to be processed. The original ingot, by mass percentage, also includes: Si content 0.30%-1.10%, Fe content ≤0.15%; Cu content 0.10%-0.60%, Mn content ≤0.20%; Mg content 0.80%-1.20%; Cr content 0.15%-0.30%, Zn content ≤0.30%, Ti content 0.05%-0.15%, Zr content 0.02%-0.04%, Sc content 0-0.30%, with the balance being Al and impurities, and the total amount of impurities being less than 0.15%, and the content of each impurity element being less than 0.05%. Step S2: The ingot to be processed is rapidly solidified using a single-roll melt casting method to obtain rapidly solidified alloy strip. Step S3: After crushing the rapidly solidified alloy strip, it is placed into a mold for cold pressing to form a cold-pressed billet. The cold-pressed billet is then encased and sealed to obtain a pre-pressed billet. Step S4: The pre-pressed billet is subjected to a first cold rolling, a hot rolling, and a second cold rolling in sequence to obtain a rolled plate; the rolling speed during the first cold rolling is 0.1-3 m / s, the number of passes during the first cold rolling is 4-6, the reduction per pass is 3-10%, and the total reduction per pass during the first cold rolling is 20%~80%; the heating temperature during the hot rolling is 360℃-520℃; Step S5: The rolled sheet is subjected to solution treatment and aging treatment in sequence to obtain the finished optical aluminum alloy sheet.

2. The preparation method according to claim 1, characterized in that, In step S1, the homogenization treatment temperature is 490-560℃ and the holding time is 8-48 h.

3. The preparation method according to claim 2, characterized in that, Step S1 further includes: cutting off the head and tail of the homogenized ingot and rolling it into a car body.

4. The preparation method according to claim 3, characterized in that, The length of the cut ends is 100-200 mm, and the depth of the car body is 5-15 mm.

5. The preparation method according to claim 1, characterized in that, In step S2, the crucible melt temperature of the tape spinner during the rapid solidification process is 780-850℃.

6. The preparation method according to claim 5, characterized in that, The melting chamber of the tape spinning machine is filled with inert gas for protection.

7. The preparation method according to claim 5, characterized in that, The linear speed of the copper cooling roller of the belt spinning machine is 10-40 m / s, and the cooling water flow rate is 1000-4000 L / h.

8. The preparation method according to claim 5, characterized in that, The nozzle pressure difference of the belt spinning machine is 15-30 kPa, and the liquid outflow width is 2.0-30.0 mm.

9. The preparation method according to claim 1, characterized in that, In step S3, the holding pressure of the cold pressing is 200-600 MPa, and the holding time is 100-600 s; And / or, in step S3, the casing is made of pure aluminum sheet, and the thickness of the pure aluminum sheet is 0.5-4 mm.

10. The preparation method according to claim 9, characterized in that, The two ends of the pure aluminum sheet used for the casing are sealed by arc welding.

11. The preparation method according to claim 9, characterized in that, The specifications of the pre-pressed blank are: length ≤ 1000 mm, width ≤ 500 mm, and height ≤ 300 mm.

12. The preparation method according to claim 1, characterized in that, In step S4, the rolling speed during hot rolling is 0.1-5 m / s.

13. The preparation method according to claim 1, characterized in that, The hot rolling passes are 3-8, with a reduction of 3-30% per pass.

14. The preparation method according to claim 1, characterized in that, The total reduction during hot rolling is 20% to 90%.

15. The preparation method according to claim 1, characterized in that, In step S4, the rolling speed during the second cold rolling is 1-10 m / s.

16. The preparation method according to claim 15, characterized in that... The second cold rolling pass consists of 4-8 passes, with a reduction of 3-30% per pass.

17. The preparation method according to claim 15, characterized in that, The total reduction in the second cold rolling pass is 30% to 80%.

18. The preparation method according to claim 1, characterized in that, In step S5, the solution treatment temperature is 490-560℃ and the time is 15-120 min; And / or, the aging treatment is performed at a temperature of 150-200℃ for a time of 1-8 hours.

19. An optical aluminum alloy sheet, characterized in that, It is prepared by the preparation method according to any one of claims 1 to 18.

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