Aluminum alloy material with high formability, aluminum alloy sheet, and method for producing the same

Abstract

This application relates to the field of metallic materials technology, disclosing a highly formable aluminum alloy material, an aluminum alloy sheet, and a method for preparing the same. The aluminum alloy sheet, by mass percentage, comprises: Fe 0.8%~1.2%, Mn 0.4%~0.8%, Zr 0.1%~0.3%, Si 0%~0.05%, Cr 0.1%~0.3%, with the remainder being Al and other unavoidable impurity elements. The total content of Fe and Mn ranges from 1.45% to 1.6%. The method for preparing the aluminum alloy sheet includes: preparing an aluminum alloy melt; continuously casting the aluminum alloy melt to obtain a billet; continuously rolling the billet to obtain a hot-rolled sheet; and performing a first cold rolling on the hot-rolled sheet to obtain the aluminum alloy sheet. This application can improve the strength, plasticity, and deep-drawing performance of the aluminum alloy material, achieve high formability, simplify the process flow, improve efficiency, and reduce energy consumption.

Description

Technical Field

[0001] This application relates to the field of metal materials technology, for example to a highly formable aluminum alloy material, an aluminum alloy sheet, and a method for preparing the same. Background Technology

[0002] Aluminum alloy is a widely used metallic material. For example, it is used in new energy vehicles. The structural components of lithium batteries in new energy vehicles generally consist of a shell and a cover plate, which are manufactured by stamping aluminum alloy. 3003 aluminum alloy sheet is widely used in the manufacture of power battery structural components due to its good corrosion resistance, heat dissipation, weldability, and deep drawing performance.

[0003] With the increasing demand for battery energy density, aluminum alloy materials are required to reduce the thickness of battery structural components while maintaining their rigidity. However, the 3003 aluminum alloy sheet used in related technologies is prepared using a hot-rolling process with large flat ingots. Due to the inherent limitations of 3003 aluminum alloy in its formability, this process cannot meet the manufacturing requirements of battery structural components. Furthermore, the hot-rolling process with large flat ingots also suffers from complex procedures and high energy consumption. Summary of the Invention

[0004] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0005] This disclosure provides a highly formable aluminum alloy material, an aluminum alloy sheet, and a method for preparing the same, thereby improving the strength, plasticity, and deep-drawing performance of the aluminum alloy material, achieving high formability, simplifying the process flow, improving efficiency, and reducing energy consumption.

[0006] In some embodiments, a highly formable aluminum alloy material is provided, comprising, by mass percentage: Fe 0.8%~1.2%, Mn 0.4%~0.8%, Zr 0.1%~0.3%, Si 0%~0.05%, Cr 0.1%~0.3%, with the remainder being Al and other unavoidable impurity elements; wherein the total content of Fe and Mn ranges from 1.45% to 1.6%.

[0007] In some embodiments, an aluminum alloy sheet is also provided, comprising, by mass percentage: Fe 0.8%~1.2%, Mn 0.4%~0.8%, Zr 0.1%~0.3%, Si 0%~0.05%, Cr 0.1%~0.3%, with the remainder being Al and other unavoidable impurity elements; wherein the total content of Fe and Mn ranges from 1.45% to 1.6%.

[0008] In some embodiments, a method for preparing aluminum alloy sheet is also provided, for preparing aluminum alloy sheet as described above, the method comprising the following steps: preparing aluminum alloy melt; continuously casting the aluminum alloy melt to obtain a billet; continuously rolling the billet to obtain a hot-rolled sheet; and performing a first cold rolling on the hot-rolled sheet to obtain an aluminum alloy sheet.

[0009] Optionally, the method for preparing aluminum alloy sheets may further include: performing online annealing on the aluminum alloy sheets obtained from the first cold rolling.

[0010] Optionally, the step of online annealing of the aluminum alloy sheet obtained from the first cold rolling includes: performing online continuous annealing on the aluminum alloy sheet obtained from the first cold rolling in an annealing furnace, with an annealing temperature of 350°C to 450°C, and / or, the traveling speed of the aluminum alloy sheet is 8 m / min to 15 m / min.

[0011] Optionally, the method for preparing aluminum alloy sheets may further include: subjecting the aluminum alloy sheets after online annealing to a second cold rolling process.

[0012] Optionally, the step of performing a second cold rolling on the aluminum alloy sheet after online annealing includes: performing a single-pass cold rolling on the aluminum alloy sheet after online annealing, with a deformation of 20% to 40%.

[0013] Optionally, the thickness of the cast billet is 20 mm to 25 mm; and / or, the thickness of the hot-rolled sheet is 3 mm to 4 mm; and / or, the thickness of the aluminum alloy sheet obtained by the first cold rolling is 1.5 mm to 1.8 mm; and / or, the thickness of the aluminum alloy sheet obtained by the second cold rolling is 1 mm to 1.2 mm.

[0014] Optionally, the method for preparing aluminum alloy sheets may further include: straightening and cleaning the aluminum alloy sheets after the second cold rolling process.

[0015] Optionally, the step of continuously casting the aluminum alloy melt to obtain a billet includes: transferring the aluminum alloy melt into a continuous casting machine for continuous casting at a casting temperature of 700°C to 710°C, and / or at a casting speed of 6 m / min to 10 m / min, and / or at a cooling water temperature of 15°C to 40°C, and obtaining the billet after cooling.

[0016] Optionally, the width of the cast billet is 1500 mm to 1800 mm.

[0017] Optionally, the step of continuously rolling the billet to obtain hot-rolled sheet includes: the billet enters a hot continuous rolling mill for continuous rolling, the deformation per hot rolling pass is 40% to 60%, the final rolling temperature is 250°C to 300°C, and hot-rolled sheet is obtained after rolling.

[0018] Optionally, the step of performing a first cold rolling on the hot-rolled sheet to obtain an aluminum alloy sheet includes: performing a single-pass cold rolling on the hot-rolled sheet with a deformation of 40% to 50%, and obtaining an aluminum alloy sheet after rolling.

[0019] Optionally, the steps for preparing the aluminum alloy melt include: preparing raw materials according to the composition and amount of the aluminum alloy sheet as described above; and sequentially passing the raw materials through alloy melting, in-furnace refining, online refining, and ultrasonic treatment to obtain the aluminum alloy melt.

[0020] Optionally, the raw materials include pure aluminum ingots, iron-containing materials, manganese-containing materials, chromium-containing materials, and zirconium-containing materials; wherein, the iron-containing materials include iron agents and / or aluminum-iron master alloys, the manganese-containing materials include pure manganese ingots and / or aluminum-manganese master alloys, the chromium-containing materials include pure chromium ingots and / or aluminum-chromium master alloys, and the zirconium-containing materials include pure zirconium ingots and / or aluminum-zirconium master alloys.

[0021] Optionally, the alloy smelting steps include: adding raw materials into a smelting furnace, heating and melting them, and then stirring and removing slag to obtain an aluminum alloy solution.

[0022] Optionally, the in-furnace refining step includes: transferring the aluminum alloy molten metal into a holding furnace for electromagnetic stirring at the bottom of the furnace to obtain an aluminum alloy melt, controlling the temperature of the aluminum alloy melt to 730°C to 750°C; refining the aluminum alloy melt in the furnace for 10 to 15 minutes; removing the slag from the surface of the refined aluminum alloy melt, readjusting the temperature to 720°C to 730°C, and allowing it to stand.

[0023] Optionally, the online refining steps include: online degassing using a rotary jet degassing box with high-purity nitrogen as the degassing medium and a nozzle rotation speed of 400 r / min to 500 r / min; and filtration to remove impurities using a two-stage foam ceramic filter plate with a porosity of 30 / 50 PPI. The hydrogen content in the aluminum alloy melt after online degassing and filtration is less than 0.12 mL / 100 g.

[0024] Optionally, the ultrasonic treatment step includes: performing online ultrasonic treatment on the online refined aluminum alloy melt, with the ultrasonic power being 5kW to 8kW and the frequency being 20kHz to 28kHz.

[0025] The highly formable aluminum alloy material, aluminum alloy sheet, and preparation method thereof provided in this disclosure can achieve the following technical effects: The high-formability aluminum alloy material provided in this disclosure has the following characteristics: Iron (Fe) of 0.8%~1.2% can refine the grains; Manganese (Mn) of 0.4%~0.8% can strengthen the material and increase its strength; Zirconium (Zr) of 0.1%~0.3% can increase the recrystallization temperature, inhibit recrystallized grain growth, and improve the uniformity of the aluminum alloy's microstructure. The total content of Fe and Mn ranges from 1.45%~1.6%, which can improve the uniformity of the iron-manganese phase, avoid the formation of coarse precipitates, thereby refining the grains and improving the uniformity and formability of the aluminum alloy. The aluminum alloy material includes Fe (0.8%~1.2%), Mn (0.4%~0.8%), Zr (0.1%~0.3%), Si (0%~0.05%), Cr (0.1%~0.3%), and Al, which can improve the strength, plasticity, and deep-drawing performance of the aluminum alloy, achieving high formability.

[0026] The aluminum alloy sheet provided in this embodiment has the same composition and content as the aforementioned highly formable aluminum alloy material. Therefore, all the technical effects of the aforementioned highly formable aluminum alloy material will not be repeated here.

[0027] The method for preparing aluminum alloy sheets disclosed in this application involves preparing an aluminum alloy melt to provide a base melt for the preparation of aluminum alloy sheets. The aluminum alloy melt is continuously cast to obtain a billet. The billet is then continuously rolled to obtain a hot-rolled sheet. This continuous casting and rolling process simplifies the process flow, improves efficiency, reduces energy consumption, and allows for sufficient deformation of the sheet by adjusting the billet thickness, thereby improving the strength and plasticity of the aluminum alloy sheet. The hot-rolled sheet undergoes a first cold rolling, followed by continuous online annealing to refine the recrystallized grains, further enhancing the strength and plasticity of the aluminum alloy sheet. The aluminum alloy sheet prepared by this method exhibits good strength, plasticity, and deep-drawing properties.

[0028] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0029] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein: Figure 1 This is a flowchart of a method for preparing an aluminum alloy sheet according to an embodiment of this disclosure; Figure 2 This is a flowchart of a method for preparing an aluminum alloy sheet according to another embodiment of the present disclosure; Figure 3This is a flowchart of a method for preparing an aluminum alloy sheet according to yet another embodiment of this disclosure; Figure 4 This is a flowchart of a method for preparing an aluminum alloy sheet according to yet another embodiment of this disclosure; Figure 5 This is a flowchart of a method for preparing an aluminum alloy sheet according to yet another embodiment of this disclosure; Figure 6 This is a flowchart of a method for preparing an aluminum alloy sheet according to yet another embodiment of this disclosure; Figure 7 This is a metallographic image of the aluminum alloy sheet provided in Embodiment 4 of this disclosure; Figure 8 This is the electron backscatter diffraction pattern of the aluminum alloy sheet provided in Embodiment 4 of this disclosure. Detailed Implementation

[0030] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0031] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0032] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0033] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0034] Unless otherwise stated, the term "multiple" means two or more.

[0035] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0036] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0038] This disclosure provides a highly formable aluminum alloy material. By mass percentage, the highly formable aluminum alloy material comprises: Fe 0.8%~1.2%, Mn 0.4%~0.8%, Zr 0.1%~0.3%, Si 0%~0.05%, Cr 0.1%~0.3%, with the remainder being Al and other unavoidable impurity elements. The total content of Fe and Mn ranges from 1.45% to 1.6%.

[0039] In this embodiment, iron (Fe) of 0.8% to 1.2% can refine the grains. Manganese (Mn) of 0.4% to 0.8% can strengthen the aluminum alloy and improve its strength. Zirconium (Zr) of 0.1% to 0.3% can increase the recrystallization temperature, inhibit recrystallized grain growth, and improve the uniformity of the aluminum alloy's microstructure.

[0040] In this embodiment, the total content of iron (Fe) and manganese (Mn) ranges from 1.45% to 1.6%, which can improve the uniformity of the iron-manganese phase, avoid the formation of coarse precipitates, refine the grains, and improve the microstructure uniformity and formability of the aluminum alloy material.

[0041] In this embodiment, the aluminum alloy material includes 0.8%~1.2% iron (Fe), 0.4%~0.8% manganese (Mn), 0.1%~0.3% zirconium (Zr), 0%~0.05% silicon (Si), 0.1%~0.3% chromium (Cr), and aluminum (Al), thereby improving the strength, plasticity, and deep-drawing performance of the aluminum alloy material and achieving high formability.

[0042] Optionally, the content of each of the other unavoidable impurity elements is ≤0.01%.

[0043] Optionally, the total amount of other unavoidable impurity elements is ≤0.05%.

[0044] Alternatively, the highly formable aluminum alloy material may be aluminum alloy sheet.

[0045] Alternatively, the highly formable aluminum alloy material may be aluminum alloy strip.

[0046] Optionally, the highly formable aluminum alloy material is an aluminum alloy profile.

[0047] Optionally, the iron (Fe) content is 0.8%, 0.9%, 1.0%, 1.1%, or 1.2%, and any value between them.

[0048] Optionally, the manganese (Mn) content is 0.4%, 0.5%, 0.6%, 0.7%, or 0.8%, or any value between them.

[0049] Optionally, the zirconium (Zr) content is 0.1%, 0.2%, or 0.3%, or any value in between.

[0050] Optionally, the silicon (Si) content is 0%, 0.01%, 0.02%, 0.03%, 0.04%, or 0.05%, or any value between them.

[0051] Optionally, the chromium (Cr) content is 0.1%, 0.2%, or 0.3%, or any value in between.

[0052] Optionally, the total content of iron (Fe) and manganese (Mn) is 1.45%, 1.46%, 1.47%, 1.48%, 1.49%, 1.50%, 1.51%, 1.52%, 1.53%, 1.54%, 1.55%, 1.56%, 1.57%, 1.58%, 1.59%, or 1.6%, and any value between them.

[0053] In some embodiments, an aluminum alloy sheet is also provided. By weight percentage, the aluminum alloy sheet comprises: Fe 0.8%~1.2%, Mn 0.4%~0.8%, Zr 0.1%~0.3%, Si 0%~0.05%, Cr 0.1%~0.3%, with the remainder being Al and other unavoidable impurity elements. The total content of Fe and Mn ranges from 1.45% to 1.6%.

[0054] In this embodiment, 0.8%~1.2% Fe can refine the grains. 0.4%~0.8% Mn can strengthen the aluminum alloy sheet and increase its strength. 0.1%~0.3% Zr can increase the recrystallization temperature, inhibit recrystallized grain growth, and improve the microstructure uniformity of the aluminum alloy sheet.

[0055] In this embodiment, the total content of iron (Fe) and manganese (Mn) ranges from 1.45% to 1.6%, which can improve the uniformity of the iron-manganese phase, while avoiding the formation of coarse precipitates, thereby refining the grains and improving the microstructure uniformity and formability of the aluminum alloy sheet.

[0056] In this embodiment, the aluminum alloy sheet comprises 0.8%~1.2% iron (Fe), 0.4%~0.8% manganese (Mn), 0.1%~0.3% zirconium (Zr), 0%~0.05% silicon (Si), 0.1%~0.3% chromium (Cr), and aluminum (Al), thereby improving the strength, plasticity, and deep-drawing performance of the aluminum alloy sheet and enhancing its formability.

[0057] In practical applications, aluminum alloy sheets possess excellent formability and uniformity, making them suitable for manufacturing battery structural components for new energy vehicles. They can meet the rigidity and thickness requirements of these components. For instance, when used to manufacture ultra-thin battery structural components, aluminum alloy sheets, after stamping, can meet both the rigidity and thickness requirements of ultra-thin battery structural components.

[0058] Optionally, the content of each of the other unavoidable impurity elements is ≤0.01%.

[0059] Optionally, the total amount of other unavoidable impurity elements is ≤0.05%.

[0060] Optionally, the iron (Fe) content is 0.8%, 0.9%, 1.0%, 1.1%, or 1.2%, and any value between them.

[0061] Optionally, the manganese (Mn) content is 0.4%, 0.5%, 0.6%, 0.7%, or 0.8%, or any value between them.

[0062] Optionally, the zirconium (Zr) content is 0.1%, 0.2%, or 0.3%, or any value in between.

[0063] Optionally, the silicon (Si) content is 0%, 0.01%, 0.02%, 0.03%, 0.04%, or 0.05%, or any value between them.

[0064] Optionally, the chromium (Cr) content is 0.1%, 0.2%, or 0.3%, or any value in between.

[0065] Optionally, the total content of iron (Fe) and manganese (Mn) is 1.45%, 1.46%, 1.47%, 1.48%, 1.49%, 1.50%, 1.51%, 1.52%, 1.53%, 1.54%, 1.55%, 1.56%, 1.57%, 1.58%, 1.59%, or 1.6%, and any value between them.

[0066] Combination Figure 1 As shown in the embodiments of this disclosure, a method for preparing an aluminum alloy sheet is also provided, for preparing the aforementioned aluminum alloy sheet. The preparation method includes the following steps: S101. Prepare aluminum alloy melt.

[0067] In this embodiment, an aluminum alloy melt is prepared to provide a base melt for the preparation of aluminum alloy sheets.

[0068] S102. Continuously cast the aluminum alloy melt to obtain a billet.

[0069] In this embodiment, the billet is obtained through continuous casting.

[0070] S103. The billet is continuously rolled to obtain hot-rolled sheet.

[0071] In this embodiment, the continuous casting and rolling process simplifies the process flow, improves efficiency, reduces energy consumption, and improves the strength and plasticity of the aluminum alloy sheet by adjusting the thickness of the billet to achieve sufficient deformation.

[0072] S104. The hot-rolled sheet is subjected to a first cold rolling process to obtain an aluminum alloy sheet.

[0073] In this embodiment, the first cold rolling provides the conditions for obtaining the state and performance of the aluminum alloy sheet product.

[0074] The aluminum alloy sheet prepared by the method in this embodiment has good strength, plasticity and deep drawing performance.

[0075] In some embodiments, the method for preparing aluminum alloy sheet further includes: performing online annealing on the aluminum alloy sheet obtained from the first cold rolling.

[0076] In this embodiment, the aluminum alloy sheet obtained by the first cold rolling is annealed online to ensure that the aluminum alloy sheet is heated and cooled evenly, recrystallization occurs while avoiding grain growth, so that the sheet has uniform microstructure and properties.

[0077] Combination Figure 2 As shown, this embodiment provides a method for preparing an aluminum alloy sheet, used to prepare the aforementioned aluminum alloy sheet. The preparation method includes the following steps: S201. Prepare aluminum alloy melt.

[0078] S202. Continuously cast the aluminum alloy melt to obtain a billet.

[0079] S203. The billet is continuously rolled to obtain hot-rolled sheet.

[0080] S204. The hot-rolled sheet is subjected to a first cold rolling process to obtain an aluminum alloy sheet.

[0081] S205. The aluminum alloy sheet obtained from the first cold rolling is subjected to online annealing.

[0082] In this embodiment, the microstructure of the sheet metal is controlled by optimizing the rolling and heat treatment processes to obtain a reasonable match between the deformation texture and the annealing texture, thereby improving the strength, plasticity and deep drawing performance of the aluminum alloy sheet metal.

[0083] The aluminum alloy sheet prepared by the method of this embodiment has excellent formability and uniformity.

[0084] In some embodiments, the step of online annealing of the aluminum alloy sheet obtained from the first cold rolling includes: performing online continuous annealing treatment on the aluminum alloy sheet obtained from the first cold rolling in an annealing furnace. The annealing temperature is 350°C to 450°C. And / or, the traveling speed of the aluminum alloy sheet is 8 m / min to 15 m / min.

[0085] In this embodiment, because the aluminum alloy sheet moves at a relatively fast speed, the heat preservation time is shorter, which avoids the growth of recrystallized grains and makes the grain structure of the aluminum alloy sheet fine and uniform.

[0086] In this embodiment, during the continuous annealing process, the aluminum alloy sheet can be uniformly heated and cooled, recrystallization occurs while grain growth is avoided, thereby achieving a high degree of uniformity in the sheet's microstructure and properties.

[0087] It is understandable that the aluminum alloy sheet has a strip structure during the continuous annealing process.

[0088] Optionally, an air-cushion annealing furnace may be used.

[0089] Optionally, the annealing temperature is 350°C, 360°C, 370°C, 380°C, 390°C, 400°C, 410°C, 420°C, 430°C, 440°C, or 450°C, or any value between them.

[0090] Optionally, the traveling speed of the aluminum alloy sheet is 8 m / min, 9 m / min, 10 m / min, 11 m / min, 12 m / min, 13 m / min, 14 m / min or 15 m / min, and any value between them.

[0091] In some embodiments, the method for preparing aluminum alloy sheet further includes: subjecting the aluminum alloy sheet after online annealing to a second cold rolling.

[0092] In this embodiment, the final state and properties of the aluminum alloy sheet are controlled by a second cold rolling process.

[0093] Combination Figure 3 As shown, this embodiment provides a method for preparing an aluminum alloy sheet, used to prepare the aforementioned aluminum alloy sheet. The preparation method includes the following steps: S301. Prepare aluminum alloy melt.

[0094] S302. Continuous casting of aluminum alloy melt to obtain a billet.

[0095] S303. The billet is continuously rolled to obtain hot-rolled sheet.

[0096] S304. The hot-rolled sheet is subjected to a first cold rolling process to obtain an aluminum alloy sheet.

[0097] S305. The aluminum alloy sheet obtained from the first cold rolling is subjected to online annealing.

[0098] S306. The aluminum alloy sheet after online annealing is subjected to a second cold rolling process.

[0099] In this embodiment, grain refinement was achieved, which improved the strength and plasticity of the aluminum alloy sheet.

[0100] In some embodiments, the step of performing a second cold rolling on the aluminum alloy sheet after online annealing includes: performing a single-pass cold rolling on the aluminum alloy sheet after online annealing, with a deformation amount of 20% to 40%.

[0101] In this embodiment, the aluminum alloy sheet after online annealing is subjected to single-pass cold rolling with a deformation amount of 20% to 40% to achieve grain refinement.

[0102] In some embodiments, the thickness of the cast billet is 20 mm to 25 mm. And / or, the thickness of the hot-rolled sheet is 3 mm to 4 mm. And / or, the thickness of the aluminum alloy sheet obtained by the first cold rolling is 1.5 mm to 1.8 mm. And / or, the thickness of the aluminum alloy sheet obtained by the second cold rolling is 1 mm to 1.2 mm.

[0103] In this embodiment, the thickness of the billet, the thickness of the hot-rolled sheet, the thickness of the aluminum alloy sheet obtained from the first cold rolling, and the thickness of the aluminum alloy sheet obtained from the second cold rolling decrease sequentially, so that the aluminum alloy sheet can obtain sufficient deformation and improve its strength and plasticity.

[0104] Optionally, the thickness of the cast billet is 20 mm, 21 mm, 22 mm, 23 mm, 24 mm or 25 mm, or any value in between.

[0105] Optionally, the thickness of the hot-rolled sheet is 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm or 4 mm, or any value in between.

[0106] Optionally, the thickness of the aluminum alloy sheet obtained from the first cold rolling is 1.5 mm, 1.6 mm, 1.7 mm or 1.8 mm, or any value in between.

[0107] Optionally, the thickness of the aluminum alloy sheet obtained by the second cold rolling is 1 mm, 1.1 mm, or 1.2 mm, or any value in between.

[0108] Combination Figure 4 As shown, this embodiment provides a method for preparing an aluminum alloy sheet, used to prepare the aforementioned aluminum alloy sheet. The preparation method includes the following steps: S401. Prepare aluminum alloy melt.

[0109] S402. Continuously cast the aluminum alloy melt to obtain a billet with a thickness of 20mm to 25mm.

[0110] S403. The billet is continuously rolled to obtain a hot-rolled plate with a thickness of 3 mm to 4 mm.

[0111] S404. The hot-rolled sheet is subjected to a first cold rolling process to obtain an aluminum alloy sheet with a thickness of 1.5mm to 1.8mm.

[0112] S405. The aluminum alloy sheet obtained from the first cold rolling is subjected to online annealing.

[0113] S406. The aluminum alloy sheet after online annealing is subjected to a second cold rolling to obtain an aluminum alloy sheet with a thickness of 1 mm to 1.2 mm.

[0114] In this embodiment, the obtained aluminum alloy sheet with a thickness of 1 mm to 1.2 mm is equivalent to obtaining a novel H14 state aluminum alloy sheet. This aluminum alloy sheet has the advantages of high strength, good plasticity, reasonable texture matching, and uniform microstructure and properties. In practical applications, it can be used for the stamping fabrication of high-energy-density lithium battery structural components.

[0115] In some embodiments, the method for preparing aluminum alloy sheet further includes: straightening and cleaning the aluminum alloy sheet after the second cold rolling process.

[0116] In this embodiment, the surface quality of the aluminum alloy sheet is improved by straightening and cleaning the aluminum alloy sheet after the second cold rolling process, so as to meet the needs of subsequent processing and use.

[0117] Combination Figure 5 As shown, this embodiment provides a method for preparing an aluminum alloy sheet, used to prepare the aforementioned aluminum alloy sheet. The preparation method includes the following steps: S501. Prepare aluminum alloy melt.

[0118] S502. Continuous casting of aluminum alloy melt to obtain a billet.

[0119] S503. The billet is continuously rolled to obtain hot-rolled sheet.

[0120] S504. The hot-rolled sheet is subjected to a first cold rolling process to obtain an aluminum alloy sheet.

[0121] S505. The aluminum alloy sheet obtained from the first cold rolling is subjected to online annealing.

[0122] S506. The aluminum alloy sheet after online annealing is subjected to a second cold rolling process.

[0123] S507. Straighten and clean the aluminum alloy sheet after the second cold rolling process.

[0124] In some embodiments, the step of continuously casting the aluminum alloy melt to obtain a billet includes: transferring the aluminum alloy melt into a continuous casting machine for continuous casting, with a casting temperature of 700°C to 710°C, and / or a casting speed of 6 m / min to 10 m / min, and / or a cooling water temperature of 15°C to 40°C, and obtaining a billet after cooling.

[0125] In this embodiment, the casting temperature is 700°C to 710°C, and / or the casting speed is 6 m / min to 10 m / min, and / or the cooling water temperature is 15°C to 40°C, so as to realize continuous casting of aluminum alloy melt to obtain billet, simplify the process, improve efficiency and reduce energy consumption.

[0126] In some embodiments, the width of the cast billet is 1500 mm to 1800 mm.

[0127] In this embodiment, a billet with a width of 1500mm to 1800mm is obtained by continuously casting the aluminum alloy melt, in preparation for continuous rolling.

[0128] Optionally, the width of the cast billet is 1500 mm, 1600 mm, 1700 mm or 1800 mm, or any value in between.

[0129] For example, molten aluminum alloy enters the mold cavity of a continuous casting machine via a horizontal ladle. The mold cavity is enclosed by two steel strips and stops. The inner surface of the steel strips is treated with a non-wetting coating material (e.g., a ceramic coating) to prevent aluminum adhesion during casting and improve the surface quality of the cast billet. In this example, the cooling rate is adjusted by controlling the cooling water spray, resulting in a cast billet with a width of 1500 mm to 1800 mm and a thickness of 20 mm to 25 mm.

[0130] In some embodiments, the step of continuously rolling a billet to obtain a hot-rolled sheet includes: the billet enters a hot continuous rolling mill for continuous rolling, the deformation per hot rolling pass is 40% to 60%, the final rolling temperature is 250°C to 300°C, and a hot-rolled sheet is obtained after rolling.

[0131] In this embodiment, the billet enters the hot continuous rolling mill, the deformation per hot rolling pass is 40% to 60%, and the final rolling temperature is 250°C to 300°C, so as to continuously roll the billet.

[0132] In this embodiment, the continuous casting and rolling process simplifies the process flow, improves efficiency, reduces energy consumption, and achieves green and low-carbon manufacturing. Continuous casting and rolling allows the sheet metal to achieve sufficient deformation, improving the strength and plasticity of the aluminum alloy sheet.

[0133] Optionally, the final rolling temperature is 250°C, 260°C, 270°C, 280°C, 290°C, or 300°C, or any value between them.

[0134] For example, after the billet leaves the continuous casting machine, it enters a hot rolling mill consisting of three stands via pinch rolls. The deformation per hot rolling pass is 40% to 60%. The resulting aluminum alloy sheet has a thickness of 3 mm to 4 mm. The final rolling temperature ranges from 250°C to 300°C. This process improves the strength and ductility of the aluminum alloy sheet.

[0135] In some embodiments, the step of performing a first cold rolling on a hot-rolled sheet to obtain an aluminum alloy sheet includes: performing a single-pass cold rolling on the hot-rolled sheet with a deformation of 40% to 50%, and obtaining an aluminum alloy sheet after rolling.

[0136] In this embodiment, aluminum alloy sheets are obtained by performing single-pass cold rolling on the continuously rolled hot-rolled sheet with a deformation of 40% to 50%, which provides conditions for finally controlling the state and performance of the aluminum alloy sheet products.

[0137] In some embodiments, the step of preparing the aluminum alloy melt includes: preparing raw materials according to the composition and amount of the aluminum alloy sheet as described above; and sequentially subjecting the raw materials to alloy melting, in-furnace refining, online refining, and ultrasonic treatment to obtain the aluminum alloy melt.

[0138] In this embodiment, raw materials are prepared according to the composition and dosage of the aluminum alloy sheet as described above, in order to prepare an aluminum alloy sheet with good strength, plasticity and deep drawing performance.

[0139] In this embodiment, the raw materials are sequentially subjected to alloy smelting, furnace refining, online refining and ultrasonic treatment to obtain aluminum alloy melt, which provides a basic melt for the preparation of aluminum alloy sheets.

[0140] Combination Figure 6 As shown, this embodiment provides a method for preparing an aluminum alloy sheet, used to prepare the aforementioned aluminum alloy sheet. The preparation method includes the following steps: S601. Prepare raw materials.

[0141] S602, alloy smelting.

[0142] S603, in-furnace refining.

[0143] S604, Online Refining.

[0144] S605, Ultrasonic treatment.

[0145] S606, Continuous casting. Aluminum alloy molten material is continuously cast to obtain a cast billet.

[0146] S607. Continuous rolling. The billet is continuously rolled to obtain hot-rolled sheet.

[0147] S608, First Cold Rolling. The hot-rolled sheet is subjected to a first cold rolling process to obtain an aluminum alloy sheet.

[0148] S609, Online Annealing. The aluminum alloy sheet obtained from the first cold rolling process is subjected to online annealing.

[0149] S610, Second Cold Rolling. The aluminum alloy sheet after online annealing undergoes a second cold rolling process.

[0150] S611. Straightening and Cleaning. Straightening and cleaning are performed on the aluminum alloy sheet after the second cold rolling process.

[0151] In this embodiment, the microstructure of the sheet metal is controlled by optimizing the rolling and heat treatment processes to obtain a reasonable match between the deformation texture and the annealing texture, thereby improving the strength, plasticity and deep drawing performance of the aluminum alloy sheet metal.

[0152] In some embodiments, the raw materials include pure aluminum ingots, iron-containing materials, manganese-containing materials, chromium-containing materials, and zirconium-containing materials. The iron-containing materials include iron-based agents and / or aluminum-iron master alloys. The manganese-containing materials include pure manganese ingots and / or aluminum-manganese master alloys. The chromium-containing materials include pure chromium ingots and / or aluminum-chromium master alloys. The zirconium-containing materials include pure zirconium ingots and / or aluminum-zirconium master alloys.

[0153] In this embodiment, pure aluminum ingots, iron-containing materials, manganese-containing materials, chromium-containing materials, and zirconium-containing materials are used as raw materials to obtain the above-mentioned aluminum alloy sheet with good strength, plasticity, and deep drawing performance.

[0154] In some embodiments, the alloy smelting step includes: adding raw materials to a smelting furnace, heating and melting them, and then stirring and removing slag to obtain an aluminum alloy solution.

[0155] In this embodiment, an aluminum alloy solution is obtained by adding raw materials into a smelting furnace, heating and melting them, and then stirring and removing slag.

[0156] In practical applications, rapid spectral analysis can be performed by sampling in front of the furnace to adjust the alloy composition and thus obtain the aforementioned aluminum alloy sheet.

[0157] In some embodiments, the in-furnace refining step includes: transferring the aluminum alloy molten metal into a holding furnace for electromagnetic stirring at the bottom of the furnace to obtain an aluminum alloy melt, controlling the temperature of the aluminum alloy melt at 730°C to 750°C. The aluminum alloy melt in the furnace is then refined for 10 to 15 minutes. The slag on the surface of the refined aluminum alloy melt is removed, the temperature is readjusted to 720°C to 730°C, and the melt is allowed to stand.

[0158] In this embodiment, the aluminum alloy solution is refined in a furnace to remove impurities and refine grains, thereby improving the quality of the aluminum alloy sheet.

[0159] In some embodiments, the online refining step includes online degassing and filtration. Online degassing employs a rotary jet degassing box using high-purity nitrogen as the degassing medium, with a nozzle rotation speed of 400 to 500 r / min. Filtration employs a two-stage foam ceramic filter plate with a porosity of 30 / 50 PPI. The hydrogen content in the aluminum alloy melt after online degassing and filtration is less than 0.12 mL / 100 g.

[0160] In this embodiment, after casting begins, the aluminum alloy melt is refined online to further improve its purity. Specifically, high-purity nitrogen is used as the degassing medium, the nozzle speed is 400 r / min to 500 r / min, and the porosity of the two-stage foam ceramic filter plate is 30 / 50 PPI, thereby improving the purity of the aluminum alloy melt.

[0161] Optionally, the rotary jet degassing box is a dual-chamber, dual-rotor rotary jet degassing box.

[0162] In some embodiments, the ultrasonic treatment step includes: subjecting the online refined aluminum alloy melt to online ultrasonic treatment, wherein the power of the ultrasonic wave is 5kW to 8kW and the frequency is 20kHz to 28kHz.

[0163] In this embodiment, the refined aluminum alloy melt is subjected to online ultrasonic treatment. The ultrasonic power is 5kW to 8kW, and the frequency is 20kHz to 28kHz. The localized undercooling caused by the cavitation effect forms a large number of fine crystal nuclei in the aluminum alloy melt. During casting, these crystal nuclei can act as heterogeneous nuclei to strongly refine the as-cast grain structure and improve the morphology of the iron-containing primary phase.

[0164] In this embodiment, online ultrasonic treatment of the refined aluminum alloy melt can significantly refine the casting grain structure and reduce microsegregation and casting defects. Furthermore, ultrasonic treatment makes the FeMnAl6 precipitates smaller and more regular.

[0165] The specific preparation process of the aluminum alloy sheet is described below through Examples 1 to 7. The contents of iron (Fe), silicon (Si), manganese (Mn), chromium (Cr), and zirconium (Zr) in Examples 1 to 7, as well as the total content of Fe + Mn, are shown in Table 1. The performance test results of the aluminum alloy sheet in Examples 1 to 7 are shown in Table 2.

[0166] Table 1. Content of various elements in aluminum alloy sheets (wt.%)

[0167] Table 2 Performance test results of aluminum alloy sheets

[0168] Example 1 As shown in Table 1, pure aluminum ingots (e.g., aluminum ingots with a purity greater than 99.7%), iron flux, aluminum-manganese master alloy, aluminum-chromium master alloy, and aluminum-zirconium master alloy are prepared according to the following composition: iron 0.81% Fe, silicon 0.04% Si, manganese 0.75% Mn, chromium 0.15% Cr, and zirconium 0.18%. In this embodiment, Fe + Mn: 1.56%.

[0169] Pure aluminum ingots, iron flux, aluminum-manganese master alloy, aluminum-chromium master alloy, and aluminum-zirconium master alloy are added to a melting furnace. After heating and melting, the mixture is stirred and slag is skimmed off to obtain an aluminum alloy solution. Samples are taken at the furnace for rapid spectral analysis to adjust the alloy composition.

[0170] The molten aluminum alloy was transferred to a holding furnace and electromagnetically stirred at the bottom, maintaining the temperature at 740°C. The molten aluminum alloy in the furnace was then refined for 10 minutes. Afterward, the slag on the surface of the molten aluminum alloy was thoroughly removed. The temperature was readjusted to 720°C, and the mixture was allowed to stand.

[0171] After casting begins, the aluminum alloy melt undergoes online refining to further improve its purity. Online refining includes two parts: online degassing and filtration to remove impurities, controlling the hydrogen content in the aluminum alloy melt to be less than 0.12 mL / 100 g.

[0172] The refined aluminum alloy melt undergoes continuous online ultrasonic treatment to improve the morphology of the iron-containing primary phase, forming numerous fine crystal nuclei and refining the as-cast grains. The ultrasonic power is 5kW and the frequency is 22kHz.

[0173] The molten aluminum alloy enters the mold cavity of the continuous casting machine via a horizontal ladle for continuous casting. The casting temperature is 710℃, the casting speed is 8m / min, and the cooling water temperature is 25℃. After cooling, a billet with a width of 1700mm and a thickness of 22mm is obtained.

[0174] After the billet leaves the continuous casting machine, it enters the hot rolling mill via pinch rolls. The deformation per hot rolling pass is 40% to 60%. After rolling, a hot-rolled plate with a thickness of 3 mm is obtained. The final rolling temperature is 260℃.

[0175] The hot-rolled sheet obtained by continuous rolling is subjected to a first cold rolling. Specifically, a single-pass cold rolling is performed with a deformation of 40% to 50%, resulting in an aluminum alloy sheet with a thickness of 1.6 mm.

[0176] The aluminum alloy sheet obtained from the first cold rolling was subjected to online continuous annealing in an air cushion annealing furnace at a temperature of 420℃ and a traveling speed of 15m / min.

[0177] After annealing, the aluminum alloy sheet is subjected to single-pass cold rolling (second cold rolling) with a deformation of 20% to 40% to obtain an aluminum alloy sheet with a thickness of 1.0 mm.

[0178] The aluminum alloy sheet after the second cold rolling is straightened and cleaned.

[0179] In this embodiment, the performance of the prepared aluminum alloy sheet with a thickness of 1.0 mm was tested. The test results are shown in Table 2: the tensile strength is 178 MPa, the yield strength is 144 MPa, the elongation is 16.8%, and the cupping value is 9.6 mm. According to the test results, the aluminum alloy sheet prepared by the method of this embodiment has good strength, plasticity, deep drawing performance, and formability.

[0180] Example 2 As shown in Table 1, pure aluminum ingots, iron flux, aluminum-manganese master alloy, aluminum-chromium master alloy, and aluminum-zirconium master alloy were prepared according to the following composition: iron 0.96%, silicon 0.03%, manganese 0.54%, chromium 0.22%, and zirconium 0.15%. In this embodiment, Fe + Mn: 1.5%.

[0181] Pure aluminum ingots, iron flux, aluminum-manganese master alloy, aluminum-chromium master alloy, and aluminum-zirconium master alloy are added to the melting furnace. After heating and melting, the mixture is stirred and slag is skimmed off to obtain an aluminum alloy solution. Samples are taken at the furnace for rapid spectral analysis to adjust the alloy composition.

[0182] The molten aluminum alloy was transferred to a holding furnace and electromagnetically stirred at the bottom, maintaining the temperature at 740°C. The molten aluminum alloy in the furnace was then refined for 10 minutes. Afterward, the slag on the surface of the molten aluminum alloy was thoroughly removed. The temperature was readjusted to 720°C, and the mixture was allowed to stand.

[0183] After casting begins, the aluminum alloy melt undergoes online refining to further improve its purity. Online refining includes two parts: online degassing and filtration to remove impurities, controlling the hydrogen content in the aluminum alloy melt to be less than 0.12 mL / 100 g.

[0184] The refined aluminum alloy melt undergoes continuous online ultrasonic treatment to improve the morphology of the iron-containing primary phase, forming numerous fine crystal nuclei and refining the as-cast grains. The ultrasonic power is 5kW and the frequency is 22kHz.

[0185] The molten aluminum alloy enters the mold cavity of the continuous casting machine via a horizontal ladle for continuous casting. The casting temperature is 710℃, the casting speed is 8m / min, and the cooling water temperature is 25℃. After cooling, a billet with a width of 1700mm and a thickness of 22mm is obtained.

[0186] After the billet leaves the continuous casting machine, it enters the hot rolling mill via pinch rolls. The deformation per hot rolling pass is 40% to 60%. After rolling, a hot-rolled plate with a thickness of 4 mm is obtained. The final rolling temperature is 260℃.

[0187] The hot-rolled sheet obtained by continuous rolling is subjected to a first cold rolling. Specifically, a single-pass cold rolling is performed with a deformation of 40% to 50%, resulting in an aluminum alloy sheet with a thickness of 1.8 mm.

[0188] The aluminum alloy sheet obtained from the first cold rolling was subjected to online continuous annealing in an air cushion annealing furnace at a temperature of 420℃ and a traveling speed of 12m / min.

[0189] After annealing, the aluminum alloy sheet is subjected to single-pass cold rolling (second cold rolling) with a deformation of 20% to 40% to obtain an aluminum alloy sheet with a thickness of 1.2 mm.

[0190] The aluminum alloy sheet after the second cold rolling is straightened and cleaned.

[0191] In this embodiment, the performance of the prepared 1.2mm thick aluminum alloy sheet was tested. The test results are shown in Table 2: the tensile strength is 174 MPa, the yield strength is 136 MPa, the elongation is 15.5%, and the cupping value is 9.2mm. According to the test results, the aluminum alloy sheet prepared by the method of this embodiment has good strength, plasticity, deep drawing performance, and formability.

[0192] Example 3 As shown in Table 1, pure aluminum ingots, iron flux, aluminum-manganese master alloy, aluminum-chromium master alloy, and aluminum-zirconium master alloy were prepared according to the following composition: iron 1.12%, silicon 0.05%, manganese 0.47%, chromium 0.11%, and zirconium 0.20%. In this embodiment, Fe + Mn: 1.59%.

[0193] Pure aluminum ingots, iron flux, aluminum-manganese master alloy, aluminum-chromium master alloy, and aluminum-zirconium master alloy are added to the melting furnace. After heating and melting, the mixture is stirred and slag is skimmed off to obtain an aluminum alloy solution. Samples are taken at the furnace for rapid spectral analysis to adjust the alloy composition.

[0194] The molten aluminum alloy was transferred to a holding furnace and electromagnetically stirred at the bottom, maintaining the temperature at 740°C. The molten aluminum alloy in the furnace was then refined for 10 minutes. Afterward, the slag on the surface of the molten aluminum alloy was thoroughly removed. The temperature was readjusted to 720°C, and the mixture was allowed to stand.

[0195] After casting begins, the aluminum alloy melt undergoes online refining to further improve its purity. Online refining includes two parts: online degassing and filtration to remove impurities, controlling the hydrogen content in the aluminum alloy melt to be less than 0.12 mL / 100 g.

[0196] The refined aluminum alloy melt undergoes continuous online ultrasonic treatment to improve the morphology of the iron-containing primary phase, forming numerous fine crystal nuclei and refining the as-cast grains. The ultrasonic power is 5kW and the frequency is 22kHz.

[0197] The molten aluminum alloy enters the mold cavity of the continuous casting machine via a horizontal ladle for continuous casting. The casting temperature is 710℃, the casting speed is 8m / min, and the cooling water temperature is 25℃. After cooling, a billet with a width of 1700mm and a thickness of 22mm is obtained.

[0198] After the billet leaves the continuous casting machine, it enters the hot rolling mill via pinch rolls. The deformation per hot rolling pass is 40% to 60%. After rolling, a hot-rolled plate with a thickness of 3 mm is obtained. The final rolling temperature is 260℃.

[0199] The aluminum alloy sheet obtained by continuous rolling is subjected to a first cold rolling, specifically, a single-pass cold rolling with a deformation of 40% to 50%, resulting in an aluminum alloy sheet with a thickness of 1.6 mm.

[0200] The aluminum alloy sheet obtained from the first cold rolling was subjected to online continuous annealing in an air cushion annealing furnace at a temperature of 400℃ and a traveling speed of 15m / min.

[0201] After annealing, the aluminum alloy sheet is subjected to single-pass cold rolling (second cold rolling) with a deformation of 20% to 40% to obtain an aluminum alloy sheet with a thickness of 1.0 mm.

[0202] The aluminum alloy sheet after the second cold rolling is straightened and cleaned.

[0203] In this embodiment, the performance of the prepared aluminum alloy sheet with a thickness of 1.0 mm was tested. The test results are shown in Table 2: the tensile strength is 182 MPa, the yield strength is 138 MPa, the elongation is 17.4%, and the cupping value is 9.9 mm. According to the test results, the aluminum alloy sheet prepared by the method of this embodiment has good strength, plasticity, deep drawing performance, and formability.

[0204] Example 4 As shown in Table 1, pure aluminum ingots, iron flux, aluminum-manganese master alloy, aluminum-chromium master alloy, and aluminum-zirconium master alloy were prepared according to the following composition: iron (Fe) 1.2%, silicon (Si) 0.05%, manganese (Mn) 0.4%, chromium (Cr) 0.10%, and zirconium (Zr) 0.21%. In this embodiment, Fe + Mn: 1.6%.

[0205] The preparation process and parameters of the aluminum alloy sheet in this embodiment are the same as those in Embodiment 3.

[0206] In this embodiment, the performance of the prepared 1.0 mm thick aluminum alloy sheet was tested. The test results are shown in Table 2: the tensile strength is 188 MPa, the yield strength is 140 MPa, the elongation is 16.3%, and the cupping value is 9.8 mm. According to the test results, the aluminum alloy sheet prepared by the method of this embodiment has good strength, plasticity, deep drawing performance, and formability.

[0207] The following section presents a microstructure analysis of the aluminum alloy sheet prepared using the method described in this embodiment, obtaining a metallographic image and an electron backscatter diffraction (EBSD) pattern to illustrate the performance of the aluminum alloy sheet.

[0208] Combination Figure 7 As shown in the metallographic image, the numerous black dots represent iron-manganese phases. This means that the aluminum alloy sheet contains a large number of fine iron-manganese phases. These iron-manganese phases promote grain nucleation, resulting in finer grains and thus improving the formability of the aluminum alloy sheet.

[0209] Combination Figure 8 As shown, Figure 8 This is an electron backscatter diffraction pattern obtained using a scanning electron microscope. Figure 8 In the diagram, different colors represent different grain sizes. Most grains are elongated structures with a length and thickness of less than 20 μm. This indicates that the aluminum alloy sheet contains a high amount of iron-rich phases, has fine grains, and good formability.

[0210] Example 5 As shown in Table 1, pure aluminum ingots, iron flux, aluminum-manganese master alloy, aluminum-chromium master alloy, and aluminum-zirconium master alloy were prepared according to the following composition: iron 0.8%, silicon 0.04%, manganese 0.8%, chromium 0.25%, and zirconium 0.30%. In this embodiment, Fe + Mn: 1.6%.

[0211] The preparation process and parameters of the aluminum alloy sheet in this embodiment are the same as those in Embodiment 3.

[0212] In this embodiment, the performance of the prepared aluminum alloy sheet with a thickness of 1.0 mm was tested. The test results are shown in Table 2: the tensile strength is 185 MPa, the yield strength is 148 MPa, the elongation is 15.7%, and the cupping value is 9.5 mm. According to the test results, the aluminum alloy sheet prepared by the method of this embodiment has good strength, plasticity, deep drawing performance, and formability.

[0213] Example 6 As shown in Table 1, pure aluminum ingots, iron flux, aluminum-manganese master alloy, aluminum-chromium master alloy, and aluminum-zirconium master alloy were prepared according to the following composition: iron 0.8%, silicon 0.05%, manganese 0.65%, chromium 0.3%, and zirconium 0.10%. In this embodiment, Fe + Mn: 1.45%.

[0214] The preparation process and parameters of the aluminum alloy sheet in this embodiment are the same as those in Embodiment 3.

[0215] In this embodiment, the performance of the prepared aluminum alloy sheet with a thickness of 1.0 mm was tested. The test results are shown in Table 2: the tensile strength is 170 MPa, the yield strength is 133 MPa, the elongation is 18.2%, and the cupping value is 10.3 mm. According to the test results, the aluminum alloy sheet prepared by the method of this embodiment has good strength, plasticity, deep drawing performance, and formability.

[0216] Example 7 As shown in Table 1, pure aluminum ingots, iron flux, aluminum-manganese master alloy, aluminum-chromium master alloy, and aluminum-zirconium master alloy were prepared according to the following composition: iron 0.85%, silicon 0.05%, manganese 0.7%, chromium 0.3%, and zirconium 0.12%. In this embodiment, Fe + Mn: 1.55%.

[0217] The preparation process and parameters of the aluminum alloy sheet in this embodiment are the same as those in Embodiment 3.

[0218] In this embodiment, the performance of the prepared aluminum alloy sheet with a thickness of 1.0 mm was tested. The test results are shown in Table 2: the tensile strength is 175 MPa, the yield strength is 141 MPa, the elongation is 16.9%, and the cupping value is 9.8 mm. According to the test results, the aluminum alloy sheet prepared by the method of this embodiment has good strength, plasticity, deep drawing performance, and formability.

[0219] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A highly formable aluminum alloy material, characterized in that, By weight percentage, including: Fe 0.8%~1.2%, Mn 0.4%~0.8%, Zr 0.1%~0.3%, Si 0%~0.05%, Cr 0.1%~0.3%, with the remainder being Al and other unavoidable impurity elements; The total content of Fe and Mn ranges from 1.45% to 1.6%.

2. An aluminum alloy sheet, characterized in that, By weight percentage, including: Fe 0.8%~1.2%, Mn 0.4%~0.8%, Zr 0.1%~0.3%, Si 0%~0.05%, Cr 0.1%~0.3%, with the remainder being Al and other unavoidable impurity elements; The total content of Fe and Mn ranges from 1.45% to 1.6%.

3. A method for preparing an aluminum alloy sheet, used to prepare the aluminum alloy sheet as described in claim 2, characterized in that, Includes the following steps: Prepare the aluminum alloy melt; Aluminum alloy melt is continuously cast to obtain a cast billet; The billet is continuously rolled to obtain hot-rolled sheet metal; The hot-rolled sheet is subjected to a first cold rolling process to obtain an aluminum alloy sheet.

4. The preparation method according to claim 3, characterized in that, Also includes: The aluminum alloy sheet obtained from the first cold rolling process is subjected to online annealing.

5. The preparation method according to claim 4, characterized in that, The steps for online annealing of aluminum alloy sheets obtained from the first cold rolling process include: The aluminum alloy sheet obtained from the first cold rolling is subjected to online continuous annealing in an annealing furnace at an annealing temperature of 350℃ to 450℃, and / or the traveling speed of the aluminum alloy sheet is 8m / min to 15m / min.

6. The preparation method according to claim 4, characterized in that, Also includes: The aluminum alloy sheet after online annealing is subjected to a second cold rolling process.

7. The preparation method according to claim 6, characterized in that, The steps for a second cold rolling of aluminum alloy sheets after online annealing include: The aluminum alloy sheet after online annealing is subjected to single-pass cold rolling with a deformation of 20% to 40%.

8. The preparation method according to claim 6, characterized in that, The thickness of the cast billet is 20 mm to 25 mm; and / or, The thickness of the hot-rolled sheet is 3mm to 4mm; and / or, The thickness of the aluminum alloy sheet obtained from the first cold rolling is 1.5 mm to 1.8 mm; and / or, The thickness of the aluminum alloy sheet obtained by the second cold rolling is 1 mm to 1.2 mm.

9. The preparation method according to claim 6, characterized in that, Also includes: The aluminum alloy sheet after the second cold rolling process is straightened and cleaned.

10. The preparation method according to any one of claims 3 to 9, characterized in that, The steps for continuously casting aluminum alloy molten metal to obtain a billet include: The molten aluminum alloy is transferred to a continuous casting machine for continuous casting at a casting temperature of 700°C to 710°C and / or a casting speed of 6 m / min to 10 m / min and / or a cooling water temperature of 15°C to 40°C. After cooling, a cast billet is obtained.

11. The preparation method according to claim 10, characterized in that, The width of the cast billet is 1500mm to 1800mm.

12. The preparation method according to any one of claims 3 to 9, characterized in that, The steps for continuously rolling a cast billet to obtain a hot-rolled sheet include: The billet enters the hot continuous rolling mill for continuous rolling. The deformation per hot rolling pass is 40% to 60%, and the final rolling temperature is 250℃ to 300℃. After rolling, hot-rolled plates are obtained.

13. The preparation method according to any one of claims 3 to 9, characterized in that, The steps for obtaining aluminum alloy sheets by first cold rolling hot-rolled sheets include: Hot-rolled sheets are subjected to single-pass cold rolling with a deformation of 40% to 50%, resulting in aluminum alloy sheets.

14. The preparation method according to any one of claims 3 to 9, characterized in that, The steps for preparing molten aluminum alloy include: Prepare raw materials according to the composition and dosage of the aluminum alloy sheet as described in claim 2; The raw materials are sequentially subjected to alloy smelting, furnace refining, online refining and ultrasonic treatment to obtain aluminum alloy melt.

15. The preparation method according to claim 14, characterized in that, The raw materials include pure aluminum ingots, iron-containing materials, manganese-containing materials, chromium-containing materials, and zirconium-containing materials; Among them, iron-containing materials include iron agents and / or aluminum-iron master alloys, manganese-containing materials include pure manganese ingots and / or aluminum-manganese master alloys, chromium-containing materials include pure chromium ingots and / or aluminum-chromium master alloys, and zirconium-containing materials include pure zirconium ingots and / or aluminum-zirconium master alloys.

16. The preparation method according to claim 14, characterized in that, The steps of alloy smelting include: The raw materials are added to a smelting furnace, heated and melted, and then stirred and slag is removed to obtain an aluminum alloy solution.

17. The preparation method according to claim 16, characterized in that, The in-furnace refining process includes: The aluminum alloy molten metal is transferred into a holding furnace and electromagnetically stirred at the bottom of the furnace to obtain an aluminum alloy melt. The temperature of the aluminum alloy melt is controlled at 730°C to 750°C. The aluminum alloy molten material in the furnace is refined for 10 to 15 minutes. Remove the slag from the surface of the refined aluminum alloy melt, readjust the temperature to 720℃ to 730℃, and let it stand.

18. The preparation method according to claim 17, characterized in that, The steps for online refining include: Online degassing uses a rotary jet degassing box with high-purity nitrogen as the degassing medium, and the nozzle speed is 400 r / min to 500 r / min; For filtration and impurity removal, a two-stage foam ceramic filter plate is used, with a porosity of 30 / 50 PPI. The hydrogen content in the aluminum alloy melt after online degassing and filtration is less than 0.12 mL / 100 g.

19. The preparation method according to claim 18, characterized in that, The steps of ultrasonic treatment include: The refined aluminum alloy melt is subjected to online ultrasonic treatment with an ultrasonic power of 5kW to 8kW and a frequency of 20kHz to 28kHz.

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