Aluminum alloy, aluminum alloy foil, heat exchanger fin and refrigeration equipment

Abstract

The invention discloses an aluminum alloy, an aluminum alloy foil, a heat exchanger fin and refrigeration equipment, and relates to the technical field of alloy materials. The aluminum alloy provided by the invention comprises 0.05 wt%-0.8 wt% of cerium rare earth elements in percentage by weight; the cerium rare earth element comprises Ce. The rare earth element Ce is added into the alloy raw materials, meanwhile, the content of Fe and Si elements in the aluminum alloy is reduced, the grain size in the metal structure can be effectively refined, and the as-cast structure can be improved; the invention further develops a rolling process matched with the aluminum alloy material, so that a coarse intermetallic compound in an as-cast structure of an aluminum alloy ingot obtained by pouring is fully crushed in the rolling process, and the prepared aluminum alloy foil has relatively high yield strength, tensile strength and ductility.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of alloy materials, in particular to an aluminum alloy, an aluminum alloy foil, a heat exchanger fin and a refrigeration equipment. BACKGROUND

[0002] Aluminum foil has the characteristics of light weight, beauty, easy processing, no pollution, recyclability and excellent heat conduction performance, and is widely used in the fields of electromechanical, packaging, building, etc. In the field of household appliances, the aluminum foil for heat exchanger fins accounts for the largest proportion, and the development direction of the heat exchanger fin as the core component of the air conditioner includes lightweight design to realize cost reduction, and large pitch fin design which is beneficial to increase air volume and drainage to improve the capacity and energy efficiency of the air conditioner. Both of them require higher mechanical performance of the aluminum foil. The 3102 aluminum alloy used in the related technology cannot meet the requirements of mechanical performance, and risks such as burr, flange crack, abnormal blanking, etc. are prone to occur in the stamping forming process of thinner and large pitch fins. SUMMARY

[0003] The main purpose of the present application is to provide a new type of aluminum alloy and aluminum alloy foil, and to optimize the smelting process of the aluminum alloy and the rolling process of the aluminum alloy foil, so as to obtain an aluminum alloy foil with good mechanical properties and to solve the problem of thinning of deep-drawn aluminum foil.

[0004] The present application provides an aluminum alloy, which comprises a cerium group rare earth element with a weight percentage of 0.05wt%-0.8wt%.

[0005] In an embodiment, the aluminum alloy comprises a cerium group rare earth element with a weight percentage of 0.1wt%-0.4wt%, and the cerium group rare earth element comprises Ce.

[0006] In an embodiment, the aluminum alloy further comprises Fe with a weight percentage of 0.05wt%-0.5wt% and Si with a weight percentage of 0.05wt%-0.5wt%.

[0007] In an embodiment, the aluminum alloy further comprises Fe with a weight percentage of 0.05wt%-0.15wt% and Si with a weight percentage of 0.05wt%-0.2wt%.

[0008] In an embodiment, the aluminum alloy comprises: Ce: 0.05wt%-0.8wt%; Fe: 0.05wt%-0.5wt%; Si: 0.05wt%-0.5wt%; Mn: 0.10wt%-0.35wt%; unavoidable impurities: ≤0.03wt%; and the balance of Al.

[0009] In an embodiment, the aluminum alloy comprises: Ce: 0.1wt%-0.4wt%; Fe: 0.05wt%-0.15wt%; Si: 0.05wt%-0.2wt%; Mn: 0.10wt%-0.25wt%; inevitable impurities: ≤0.03wt%; and the balance of Al.

[0010] The application further provides a preparation method of the aluminum alloy, comprising the following steps: S10, each component of the metal raw material is weighed according to the metal element ratio of the aluminum alloy, and the metal raw material comprises aluminum ingot, Al-Fe intermediate alloy ingot, Al-Si intermediate alloy ingot, Al-Mn intermediate alloy ingot and Al-Ce intermediate alloy ingot; S20, the aluminum ingot is added into a smelting furnace, melted and heat preserved to obtain high-purity aluminum liquid; then the remaining metal raw materials are added, heated and stirred to melt to obtain alloy liquid; S30, refining and degassing treatment are performed, slag is removed, heat preserved and poured to obtain aluminum alloy plate ingot.

[0011] In an embodiment, in the step S20, the aluminum ingot is added into the smelting furnace, heated to 715-735 DEG C, and the aluminum ingot is completely melted and heat preserved for 30-50 min to obtain the high-purity aluminum liquid.

[0012] In an embodiment, in the step S20, the temperature of the high-purity aluminum liquid is kept at 715-735 DEG C, the Al-Fe intermediate alloy ingot is added into the high-purity aluminum liquid and heat preserved for 10-20 min; the Al-Si intermediate alloy ingot is added and heat preserved for 10-20 min; the Al-Mn intermediate alloy ingot is added and heat preserved for 10-20 min; the Al-Ce intermediate alloy ingot is added, heated to 760-770 DEG C, and stirred to completely melt to obtain the alloy liquid.

[0013] In an embodiment, in the step S30, the refining agent and the degassing agent are added into the alloy liquid, the stirring is continuously performed for 15 min, the slag is removed, and the alloy liquid is heat preserved for 10-15 min until the temperature of the alloy liquid is reduced to 720-760 DEG C, and then poured to obtain the aluminum alloy plate ingot.

[0014] The application further provides an aluminum alloy foil prepared by using the above aluminum alloy.

[0015] In an embodiment, when the thickness of the aluminum alloy foil is not less than 0.095 mm, the yield strength of the aluminum alloy foil is not less than 143 MPa.

[0016] In an embodiment, the tensile strength of the aluminum alloy foil is not less than 149 MPa when the thickness of the aluminum alloy foil is not less than 0.095 mm.

[0017] In an embodiment, the elongation of the aluminum alloy foil is not less than 8% when the thickness of the aluminum alloy foil is not less than 0.095 mm.

[0018] The present application also provides a preparation method of an aluminum alloy foil, comprising the following steps: T10, homogenizing heat treatment and removing the oxide skin of the aluminum alloy plate ingot; T20, multi-pass hot rolling treatment of the aluminum alloy plate ingot after the step T10 to obtain an aluminum alloy hot-rolled plate, and then air cooling to room temperature; T30, multi-pass cold rolling treatment of the aluminum alloy hot-rolled plate to obtain a foil, and then annealing treatment to complete the preparation of the aluminum alloy foil.

[0019] In an embodiment, in the step T10, the aluminum alloy plate ingot is placed in a furnace with a furnace temperature of 520-540℃ for 6-8h for homogenizing heat treatment, and then the oxide skin on the surface of the aluminum alloy plate ingot is removed.

[0020] In an embodiment, in the step T20, the hot rolling temperature of the aluminum alloy plate ingot is 420-450℃, and the aluminum alloy plate ingot is placed in a furnace at the hot rolling temperature for 30-60min before the hot rolling treatment.

[0021] In an embodiment, in the step T20, the pass deformation of the aluminum alloy plate ingot is controlled to be 15-20% during the hot rolling process, and the aluminum alloy plate ingot is reheated after each pass rolling and is kept at 420-450℃ for 10-30min.

[0022] In an embodiment, in the step T20, the thickness of the aluminum alloy hot-rolled plate is 3-5mm.

[0023] In an embodiment, in the step T30, the pass deformation of the aluminum alloy plate ingot is controlled to be 10-40% during the cold rolling process.

[0024] In an embodiment, in the step T30, the thickness of the foil after the cold rolling treatment is 0.095-0.15mm.

[0025] In an embodiment, in the step T30, the foil obtained after the cold rolling treatment is placed in a furnace for annealing treatment at 260-280℃ for 6-8h.

[0026] The application further provides a heat exchanger fin prepared from the aluminum alloy foil.

[0027] The application further provides a refrigeration device prepared from the aluminum alloy, or prepared from the aluminum alloy foil, or prepared from the heat exchanger fin.

[0028] The technical scheme in the application designs an aluminum alloy, an aluminum alloy foil and a corresponding preparation process, the application can effectively refine the grain size in the metal organization and improve the as-cast organization by adding a rare earth element Ce in the alloy raw material and simultaneously reducing the content of Fe and Si elements in the aluminum alloy, the application further develops a rolling process matched with the above aluminum alloy material, so that the coarse intermetallic compounds in the as-cast organization of the aluminum alloy ingot obtained by pouring are fully broken in the rolling process, so that the prepared aluminum alloy foil has high yield strength, tensile strength and elongation. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description, and obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of the structures shown in the drawings.

[0030] Figure 1 It is a metallographic organization photo of the aluminum alloy ingot after homogenization heat treatment in Example 1; Figure 2 It is a metallographic organization photo of the aluminum alloy ingot after homogenization heat treatment in Comparative Example 1; Figure 3 It is a metallographic organization photo (a) of the aluminum alloy hot-rolled plate after anode coating treatment in Example 1; Figure 4 It is a metallographic organization photo (a) of the aluminum alloy hot-rolled plate after anode coating treatment in Comparative Example 1; Figure 5 It is another metallographic organization photo (b) of the aluminum alloy hot-rolled plate after anode coating treatment in Example 1; Figure 6 It is another metallographic organization photo (b) of the aluminum alloy hot-rolled plate after anode coating treatment in Comparative Example 1; The implementation, functional features and advantages of the application will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION

[0031] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0032] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications will also change accordingly.

[0033] In addition, if the embodiments of the present application involve descriptions such as “first”, “second”, etc., the descriptions of “first”, “second”, etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first” and “second” can explicitly or implicitly include at least one of the features. In addition, “and / or” or “and / or” appearing throughout the text means that the three parallel solutions are included, for example, “A and / or B” includes A solution, or B solution, or A and B solutions are satisfied at the same time. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection claimed by the present application.

[0034] The technical problems solved by the present application include that the aluminum foil has the characteristics of light weight, beauty, easy processing, no pollution, recyclability, excellent heat conduction performance, etc., and is widely used in the fields of electromechanical, packaging, building, etc. In the field of household appliances, the aluminum foil for heat exchanger fins accounts for the largest proportion, and the development direction of the heat exchanger fins as the core component of the air conditioner includes lightweight design to realize cost reduction of the fins, and large-pitch fin design is beneficial to increase the air volume and drainage to improve the capacity and energy efficiency of the air conditioner, both of which require higher mechanical performance of the aluminum foil.

[0035] The 3102 aluminum alloy used in the related art cannot meet the requirements of mechanical properties, and in the stamping forming process of thinner and large-pitch fins, there are risks such as burrs, flange cracks, and abnormal blanking. Although the fin forming with 8011 material with good plasticity and an aluminum foil with a thickness of 0.105 mm can improve the above problems, the cost of the aluminum foil raw material will increase significantly.

[0036] In order to solve the above technical problems, a new type of aluminum alloy, aluminum alloy foil and the melting process of the aluminum alloy and the rolling process of the aluminum alloy foil are optimized, so that the aluminum alloy foil with good mechanical properties is obtained and the thinning problem of the deep-drawing aluminum foil is well solved.

[0037] The application provides an aluminum alloy, which comprises a cerium group rare earth element in a weight percentage of 0.05wt%-0.8wt%.

[0038] It should be noted that by adding a small amount of Ce to the raw material of the aluminum alloy, the Ce and Al in the alloy melt can form stable nanoscale intermetallic compounds such as Al4Ce and AlCe3, which can serve as heterogeneous nucleation cores to improve the nucleation rate; meanwhile, during the solidification process of the aluminum alloy, the Ce is enriched at the solid-liquid interface to inhibit the growth of alpha-Al grains and reduce the secondary dendrite spacing; and during the rolling process of the aluminum alloy foil, the Ce is segregated at the grain boundaries to pin dislocations, so that the annealing treatment can be carried out at a higher annealing temperature without grain growth and the fine-grained structure can be maintained.

[0039] It should be further noted that when the content of the Ce element in the aluminum alloy is too low (less than 0.05wt%), there are not enough heterogeneous nucleation cores in the aluminum alloy structure, which can cause the secondary dendrite spacing of alpha-Al to increase, so that the Ce element cannot play the corresponding role of refining the grains; in addition, the aluminum oxide and aluminum carbide inclusions in the aluminum alloy melt cannot be reduced in time by the Ce, which can reduce the density of the metal structure of the aluminum alloy. When the content of the Ce element in the aluminum alloy is too high (more than 0.8wt%), blocky Al8Ce3 phases can be formed, which can serve as crack sources during the subsequent rolling process after the pouring of the aluminum alloy, so that cracks are prone to occur when the thickness of the aluminum alloy foil is low; in addition, the Ce element can be excessively enriched at the grain boundaries to form a brittle structure, which can greatly reduce the toughness of the aluminum alloy material.

[0040] In an embodiment, the aluminum alloy comprises a cerium group rare earth element in a weight percentage of 0.1wt%-0.4wt%; and the cerium group rare earth element comprises Ce.

[0041] In some embodiments of the application, the weight percentage of the cerium group rare earth element in the aluminum alloy can be 0.1wt%, 0.2wt%, 0.25wt% and 0.4wt%, etc. By adopting the above technical solution, the Ce element can better refine the grains and maintain the fine-grained structure, so that the aluminum alloy foil prepared has higher yield strength, tensile strength and elongation.

[0042] In an embodiment, the aluminum alloy further comprises Fe in a weight percentage of 0.05wt%-0.5wt% and Si in a weight percentage of 0.05wt%-0.5wt%.

[0043] It should be noted that Fe and Si in the aluminum alloy material generally interact to form intermetallic phases such as iron-rich phases, for example, Al6(Fe, Mn) or a-Al(Fe, Mn)Si, which can act as heterogeneous nucleation cores and effectively pin grain boundaries during subsequent hot rolling and annealing processes, promoting grain refinement and thus improving the uniformity of the as-cast structure. Secondly, uniformly distributed iron-rich phases can play a certain dispersion strengthening role, which can improve the strength of the aluminum alloy to a certain extent. In addition, Fe and Si can synergize with Ce to generate nanoscale Al8CeFe2 phases and other intermetallic compounds with good thermal stability in the aluminum alloy, which is conducive to further pinning dislocations and grain boundaries and contributing to dispersion strengthening.

[0044] It should also be noted that when Fe and Si are added in excess in the aluminum alloy material, more coarse and brittle harmful β phases are easily formed, which cannot play the corresponding role of refining grains, resulting in a significant reduction in the strength and toughness of the aluminum alloy material; when Fe and Si are insufficiently added in the aluminum alloy material, there are not enough heterogeneous nucleation cores to inhibit grain growth, resulting in a weak effect of inhibiting grain growth.

[0045] In an embodiment, the aluminum alloy further includes Fe at 0.05wt%-0.15wt% and Si at 0.05wt%-0.2wt% by weight percentage.

[0046] In some embodiments of the present application, the weight percentage of Fe in the aluminum alloy can be 0.05wt%, 0.1wt%, and 0.15wt%, and the weight percentage of Si in the aluminum alloy can be 0.05wt%, 0.1wt%, and 0.2wt%, etc. By adopting the above technical solution, the grain boundaries can be further effectively pinned, and the grain refinement can be promoted, thereby improving the uniformity of the as-cast structure. Thus, the aluminum alloy foil prepared has higher yield strength, tensile strength, and elongation.

[0047] In an embodiment, the aluminum alloy includes, by weight percentage: Ce: 0.05wt%-0.8wt%; Fe: 0.05wt%-0.5wt%; Si: 0.05wt%-0.5wt%; Mn: 0.10wt%-0.35wt%; unavoidable impurities ≤0.03wt%; and the balance of Al.

[0048] In a preferred embodiment, the aluminum alloy comprises, in percentage by weight: Ce: 0.1wt%-0.4wt%; Fe: 0.05wt%-0.15wt%; Si: 0.05wt%-0.2wt%; Mn: 0.10wt%-0.25wt%; inevitable impurities≤0.03wt%; and, the balance of Al. It should be noted that, in this embodiment, by further strictly limiting the Ce, Fe, Si, Mn and impurities in the aluminum alloy within a specific range, the prepared aluminum alloy material has a smaller grain size, and has excellent hot workability, toughness and formability.

[0049] The present application also provides a preparation method of the aluminum alloy, comprising the following steps: S10, the metal raw materials of each component are weighed according to the metal element ratio of the aluminum alloy, and the metal raw materials include aluminum ingot, Al-Fe intermediate alloy ingot, Al-Si intermediate alloy ingot, Al-Mn intermediate alloy ingot and Al-Ce intermediate alloy ingot; S20, the aluminum ingot is added into a smelting furnace, melted and heat preserved to obtain high-purity aluminum liquid; then the remaining metal raw materials are added, heated and stirred to melt to obtain alloy liquid; S30, refining and degassing treatment are performed, slag is removed, heat preserved, and poured to obtain aluminum alloy plate ingot.

[0050] In an embodiment, in the step S20, the aluminum ingot is added into the smelting furnace, heated to 715°C-735°C, and the aluminum ingot is completely melted and heat preserved for 30min-50min to obtain the high-purity aluminum liquid. In a preferred embodiment, in the step S10, the aluminum ingot is added into the smelting furnace, heated to 720°C, and the aluminum ingot is completely melted and heat preserved for 30min to obtain the high-purity aluminum liquid.

[0051] In an embodiment, in the step S20, the temperature of the high-purity aluminum liquid is kept at 715°C-735°C, the Al-Fe intermediate alloy ingot is added into the high-purity aluminum liquid and heat preserved for 10min-20min; the Al-Si intermediate alloy ingot is added and heat preserved for 10min-20min; the Al-Mn intermediate alloy ingot is added and heat preserved for 10min-20min; the Al-Ce intermediate alloy ingot is added, heated to 760°C-770°C, and stirred to completely melt to obtain the alloy liquid.

[0052] It should be noted that in the embodiment, the melting points of the Ce, Fe, Si and Mn intermediate alloys and the diffusion rates of Ce, Fe, Si and Mn in the aluminum liquid are comprehensively considered, the intermediate alloys of Fe, Si and Mn are sequentially added first to promote the formation of uniform and fine alpha-Al(Fe, Mn)Si phase and inhibit the formation of beta-AlFeSi needle-shaped phase, and finally the Al-Ce intermediate alloy is added to modify the iron-containing phase to make the alpha-Al(Fe, Mn)Si more rounded. In addition, the final addition of the Al-Ce intermediate alloy is beneficial to prevent the problem of premature addition of easy oxidation and burning loss. In summary, by controlling the addition sequence of the specific intermediate alloy in step S20, the aluminum alloy composition is ensured to be uniform, defects are avoided, and the metal organization performance of the aluminum alloy is optimized through "step-by-step dissolution, heat preservation diffusion and high-temperature final mixing".

[0053] In an embodiment, in step S30, a refining agent and a degassing agent are added to the alloy liquid, stirring is continued for 15 min, slag is removed, and the alloy liquid is allowed to stand until the temperature of the alloy liquid is reduced to 720-760 DEG C, heat preservation is performed for 10-15 min, and the aluminum alloy slab is obtained by pouring.

[0054] In a preferred embodiment, in step S30, a refining agent and a degassing agent are added to the alloy liquid, stirring is continued for 15 min, slag is removed, and the alloy liquid is allowed to stand until the temperature of the alloy liquid is reduced to 760 DEG C, heat preservation is performed for 10 min, and the aluminum alloy slab is obtained by pouring.

[0055] In a specific embodiment, the refining agent can be one or more of sodium nitrate, chloride salt, fluoride salt and other inorganic salts, and the degassing agent can be hexachloroethane and the like.

[0056] The application further provides an aluminum alloy foil prepared from the aluminum alloy.

[0057] In an embodiment, when the thickness of the aluminum alloy foil is not less than 0.095 mm, the yield strength of the aluminum alloy foil is not less than 143 MPa.

[0058] In an embodiment, when the thickness of the aluminum alloy foil is not less than 0.095 mm, the tensile strength of the aluminum alloy foil is not less than 149 MPa.

[0059] In an embodiment, when the thickness of the aluminum alloy foil is not less than 0.095 mm, the elongation of the aluminum alloy foil is not less than 8%.

[0060] In a preferred embodiment, when the thickness of the aluminum alloy foil is not less than 0.095 mm, the yield strength of the aluminum alloy foil is not less than 143 MPa, the tensile strength of the aluminum alloy foil is not less than 149 MPa, and the elongation of the aluminum alloy foil is not less than 8%.

[0061] The application further provides a preparation method of the aluminum alloy foil, comprising the following steps: T10, homogenizing heat treatment and oxide removal treatment are performed on the aluminum alloy slab ingot; T20, the aluminum alloy slab ingot after the step T10 is subjected to multi-pass hot rolling treatment to obtain an aluminum alloy hot-rolled plate, and then air cooling is performed to room temperature; T30, the aluminum alloy hot-rolled plate is subjected to multi-pass cold rolling treatment to obtain a foil, and then annealing treatment is performed, thereby completing the preparation of the aluminum alloy foil.

[0062] In an embodiment, in the step T10, the aluminum alloy slab ingot is placed in a furnace with a furnace temperature of 520-540 DEG C for 6-8 hours for homogenizing heat treatment, and then the oxide on the surface of the aluminum alloy slab ingot is removed.

[0063] In an embodiment, in the step T20, the hot rolling temperature of the aluminum alloy slab ingot is 420-450 DEG C, and the aluminum alloy slab ingot is placed in a furnace for 30-60 minutes at the hot rolling temperature before the hot rolling treatment.

[0064] In an embodiment, in the step T20, the pass deformation of the aluminum alloy slab ingot is controlled to be 15-20% during the hot rolling, and the aluminum alloy slab ingot is reheated and kept for 10-30 minutes after each pass rolling.

[0065] In an embodiment, in the step T20, the thickness of the aluminum alloy hot-rolled plate is 3-5 mm.

[0066] In an embodiment, in the step T30, the pass deformation of the aluminum alloy slab ingot is controlled to be 10-40% during the cold rolling.

[0067] In an embodiment, in the step T30, the thickness of the foil after the cold rolling treatment is 0.095-0.15 mm.

[0068] In an embodiment, in the step T30, the foil obtained after the cold rolling treatment is placed in a furnace for annealing treatment at 260-280 DEG C for 6-8 hours.

[0069] The application further provides a heat exchanger fin prepared from the aluminum alloy foil.

[0070] The application further provides a refrigeration equipment prepared from the aluminum alloy.

[0071] The application further provides a refrigeration equipment prepared from the aluminum alloy foil, in particular, a heat exchanger fin of the refrigeration equipment.

[0072] The application further provides a refrigeration device using the heat exchanger fin.

[0073] The application is further described below through specific examples: The application does not make specific restrictions on the source of raw materials, and the raw materials in each embodiment of the application are commercially available.

[0074] Preparation Example 1 The elemental composition of the aluminum alloy in Preparation Example 1 includes, by weight percentage: Ce: 0.4wt%; Fe: 0.15wt%; Si: 0.2wt%; Mn: 0.25wt%; and the balance of Al (impurity content is very small and negligible).

[0075] The preparation method of the aluminum alloy in Preparation Example 1 includes the following steps: S10, a total weight of 3kg per furnace is prepared, and the metal raw materials of each component are weighed according to the metal element ratio of the aluminum alloy, and the metal raw materials include aluminum ingots, Al-Fe intermediate alloy ingots, Al-Si intermediate alloy ingots, Al-Mn intermediate alloy ingots, and Al-Ce intermediate alloy ingots; S20, the aluminum ingots are added to the smelting furnace, heated to 720℃, and after the aluminum ingots are completely melted, heat preservation is performed for 30min to obtain high-purity aluminum liquid; the Al-Fe intermediate alloy ingot is added to the high-purity aluminum liquid, and heat preservation is performed for 20min; the Al-Si intermediate alloy ingot is added, and heat preservation is performed for 20min; the Al-Mn intermediate alloy ingot is added, and heat preservation is performed for 20min; the Al-Ce intermediate alloy ingot is added, heated to 760℃, and stirred until completely melted to obtain an alloy liquid; S30, a refining agent and a degassing agent are added for refining and degassing treatment, and slag is removed, and after the temperature of the alloy liquid is reduced to 760℃, heat preservation is performed for 15min, and pouring is performed to obtain a 3102 aluminum alloy plate ingot containing rare earth cerium.

[0076] Example 1 The aluminum alloy foil in Example 1 is prepared using the aluminum alloy plate ingot in Preparation Example 1.

[0077] The preparation method of the aluminum alloy foil in Example 1 includes the following steps: T10, the aluminum alloy plate ingot prepared in Preparation Example 1 is subjected to homogenization heat treatment: heat preservation at 540℃ for 8h; and then the oxide skin on the surface of the aluminum alloy plate ingot is removed; T20, the aluminum alloy plate ingot after the step T10 is processed is subjected to multi-pass hot rolling treatment, the hot rolling temperature is 450℃, the plate ingot is kept for at least 30min before rolling, the plate ingot is rolled to 3-5mm by multi-pass hot rolling, the reduction of each pass is about 15%-20%, the plate ingot is returned to the furnace after each pass of rolling, and is kept for 30min at 450℃, to obtain an aluminum alloy hot-rolled plate, which is then air-cooled; T30, the aluminum alloy hot-rolled plate is subjected to multi-pass cold rolling treatment, the reduction of each pass is about 15%-20%, and is cold-rolled to a thickness of 0.095mm to obtain a foil, which is then annealed at 280℃ for 8h to complete the preparation of the aluminum alloy foil.

[0078] Preparation Example 2 Preparation Example 2 is based on Preparation Example 1, except that the element composition of the aluminum alloy in Preparation Example 2 is different; the element composition of the aluminum alloy in Preparation Example 2 includes, by weight percentage: Ce: 0.2wt%; Fe: 0.15wt%; Si: 0.2wt%; Mn: 0.25wt%; and the balance of Al (the impurity content is extremely small and can be ignored).

[0079] The preparation method of the aluminum alloy in Preparation Example 2 is the same as that in Preparation Example 1.

[0080] Example 2 The aluminum alloy foil in Example 2 is prepared by using the aluminum alloy plate ingot in Preparation Example 2.

[0081] The preparation method of the aluminum alloy foil in Example 2 is the same as that in Example 1.

[0082] Preparation Example 3 Preparation Example 3 is based on Preparation Example 1, except that the element composition of the aluminum alloy in Preparation Example 3 is different; the element composition of the aluminum alloy in Preparation Example 3 includes, by weight percentage: Ce: 0.1wt%; Fe: 0.15wt%; Si: 0.2wt%; Mn: 0.25wt%; and the balance of Al (the impurity content is extremely small and can be ignored).

[0083] The preparation method of the aluminum alloy in Preparation Example 3 is the same as that in Preparation Example 1.

[0084] Example 3 The aluminum alloy foil in Example 3 is prepared by using the aluminum alloy plate ingot in Preparation Example 3.

[0085] The preparation method of the aluminum alloy foil in Example 3 is the same as that in Example 1.

[0086] Preparation Example 4 Preparation Example 4 is based on Preparation Example 1, except that the elemental composition of the aluminum alloy in Preparation Example 4 is different; the elemental composition of the aluminum alloy in Preparation Example 4 includes, by weight percent: Ce: 0.8 wt%; Fe: 0.15 wt%; Si: 0.2 wt%; Mn: 0.25 wt%; and the balance Al (impurities are present in very small amounts and are negligible).

[0087] The aluminum alloy in Preparation Example 4 is prepared in the same manner as in Preparation Example 1.

[0088] Example 4 The aluminum alloy foil in Example 4 is prepared from the aluminum alloy ingot in Preparation Example 4.

[0089] The aluminum alloy foil in Example 4 is prepared in the same manner as in Example 1.

[0090] Preparation Comparative Example 1 The elemental composition of the aluminum alloy in Preparation Comparative Example 1 includes, by weight percent: Fe: 0.3 wt%; Si: 0.55 wt%; Mn: 0.25 wt%; and the balance Al (impurities are present in very small amounts and are negligible).

[0091] The aluminum alloy in Preparation Comparative Example 1 is prepared by the following steps: S10, each furnace is charged with a total weight of 3 kg of metal raw materials of each component according to the metal element ratio of the aluminum alloy, the metal raw materials including aluminum ingots, Al-Fe intermediate alloy ingots, Al-Si intermediate alloy ingots, and Al-Mn intermediate alloy ingots; S20, the aluminum ingots are added to a smelting furnace, heated to 720°C, and after the aluminum ingots are completely melted, heat preservation is performed for 30 min to obtain a high-purity aluminum liquid; the Al-Fe intermediate alloy ingots are added to the high-purity aluminum liquid, and heat preservation is performed for 20 min; the Al-Si intermediate alloy ingots are added, and heat preservation is performed for 20 min; the Al-Mn intermediate alloy ingots are added, heated to 760°C, and stirred until completely melted to obtain an alloy liquid; S30, refining and degassing agents are added for refining and degassing treatment, slag is removed, the alloy liquid is cooled to 760°C, heat preservation is performed for 15 min, and then casting is performed to obtain a 3102 aluminum alloy ingot.

[0092] Comparative Example 1 The aluminum alloy foil in Comparative Example 1 is prepared from the aluminum alloy ingot in Preparation Comparative Example 1.

[0093] The aluminum alloy foil in Comparative Example 1 is prepared by the following steps: T10, the aluminum alloy ingot prepared in Preparation Comparative Example 1 is subjected to homogenization heat treatment at 540°C for 8 h; and then the oxide skin on the surface of the aluminum alloy ingot is removed; T20, the aluminum alloy ingot after step T10 is subjected to multi-pass hot rolling treatment, the hot rolling temperature is 450℃, the ingot is kept for at least 30 minutes before rolling, the ingot is rolled to 3-5mm by multi-pass hot rolling, the reduction of each pass is about 15%-20%, the ingot is kept for 30 minutes after each pass of rolling, and an aluminum alloy hot-rolled plate is prepared, and then the aluminum alloy hot-rolled plate is subjected to air cooling; T30, the aluminum alloy hot-rolled plate is subjected to multi-pass cold rolling treatment to obtain a foil, and then the foil is subjected to annealing treatment at 280℃ for 8 hours, and the preparation of the aluminum alloy foil is completed.

[0094] Performance detection (1) The yield strength, tensile strength and elongation of the aluminum alloy foils prepared in Examples 1-4 and Comparative Example 1 are measured respectively, and the measurement results are shown in Table 1.

[0095] (2) The metallographic structure photos of the aluminum alloy ingots after homogenization heat treatment in Example 1 and Comparative Example 1 and the metallographic structure photos of the aluminum alloy hot-rolled plates after anodic film plating treatment are measured respectively, and the measurement results are shown in Figures 1-6 . (The anodic film plating parameters specifically include: voltage: 20V-30V, current: 0.2A-0.4A, temperature: room temperature, etchant: fluoroboric acid: distilled water = 5g: 200ml, etching time: 1min-3min) Table 1

[0096] Through analysis of the data in Table 1, the room temperature mechanical properties of the aluminum alloy foil in Comparative Example 1 are: the yield strength is 121MPa, the tensile strength is 132MPa, and the elongation is 5.9%, which are obviously lower than those of the examples of the present application.

[0097] By observing the metallographic structures of the ingots after homogenization heat treatment in Example 1 and Comparative Example 1, it can be found that the microstructure is composed of α-Al matrix and coarse black intragranular spherical or strip-shaped second phase and network-shaped second phase distributed along the grain boundary, and the grain size of Example 1 is obviously smaller than that of Comparative Example 1. By observing the metallographic structures of the ingots after homogenization heat treatment and hot rolling in Example 1 and Comparative Example 1, it can be found that after the microstructure is deformed by rolling, the cast microstructure grains are stretched into obvious fibrous structure along the rolling direction under the action of rolling stress, and a typical rolling structure is presented. The long strip-shaped and flaky coarse intermetallic compounds in the as-cast state are broken into short rod-shaped and granular shapes by multi-pass rolling. In addition, it can be found that the number of second phases in Example 1 is obviously more than that in Comparative Example 1, which is crucial for improving the mechanical properties of the subsequent hot-rolled plate, especially the foil.

[0098] The above merely illustrates the embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like, within the technical concept of the present application, and based on the content of the present application and the accompanying drawings, are included in the patent protection scope of the present application.

Claims

1. An aluminum alloy characterized by, The aluminum alloy includes cerium group rare earth elements in a weight percentage of 0.05wt%-0.8wt%; The cerium group rare earth elements include Ce.

2. The aluminum alloy of claim 1, wherein, The aluminum alloy includes cerium group rare earth elements in a weight percentage of 0.1wt%-0.4wt%; The cerium group rare earth elements include Ce.

3. The aluminum alloy of claim 1, wherein The aluminum alloy further includes Fe in a weight percentage of 0.05wt%-0.5wt% and Si in a weight percentage of 0.05wt%-0.5wt%.

4. The aluminum alloy of claim 1, wherein The aluminum alloy further includes Fe in a weight percentage of 0.05wt%-0.15wt% and Si in a weight percentage of 0.05wt%-0.2wt%.

5. The aluminum alloy of claim 1, wherein The aluminum alloy includes, in weight percentage: Ce: 0.05wt%-0.8wt%; Fe: 0.05wt%-0.5wt%; Si: 0.05wt%-0.5wt%; Mn: 0.10wt%-0.35wt%; Inevitable impurities ≤0.03wt%; and, the balance of Al.

6. The aluminum alloy of claim 5, wherein, The aluminum alloy includes, in weight percentage: Ce: 0.1wt%-0.4wt%; Fe: 0.05wt%-0.15wt%; Si: 0.05wt%-0.2wt%; Mn: 0.10wt%-0.25wt%; Inevitable impurities ≤0.03wt%; and, the balance of Al.

7. A method of producing the aluminum alloy as claimed in any one of claims 1 to 6, characterized by, The preparation method of the aluminum alloy includes the following steps: S10, according to the metal element ratio of the aluminum alloy, the metal raw materials of each component are weighed, and the metal raw materials include aluminum ingot, Al-Fe intermediate alloy ingot, Al-Si intermediate alloy ingot, Al-Mn intermediate alloy ingot, and Al-Ce intermediate alloy ingot; S20, the aluminum ingot is added to a smelting furnace, melted and heat preserved to obtain high-purity aluminum liquid; then the remaining metal raw materials are added, heated and stirred to melt to obtain alloy liquid; S30, refining and degassing treatment are performed, slag is removed, heat preserved, and poured to obtain aluminum alloy plate ingot.

8. The preparation method of the aluminum alloy according to claim 7, wherein, in the step S20, the aluminum ingot is added to the smelting furnace, heated to 715°C-735°C, and heat preserved for 30min-50min after the aluminum ingot is completely melted to obtain the high-purity aluminum liquid; and / or, in the step S20, the temperature of the high-purity aluminum liquid is maintained at 715°C-735°C, the Al-Fe intermediate alloy ingot is added to the high-purity aluminum liquid, heat preserved for 10min-20min; the Al-Si intermediate alloy ingot is added, heat preserved for 10min-20min; the Al-Mn intermediate alloy ingot is added, heat preserved for 10min-20min; the Al-Ce intermediate alloy ingot is added, heated to 760°C-770°C, and stirred to completely melt to obtain the alloy liquid; and / or, in the step S30, the refining agent and the degassing agent are added to the alloy liquid, continuously stirred for 15min, slag is removed, and heat preserved for 15min-30min after the temperature of the alloy liquid is reduced to 760°C-770°C, and then poured to obtain the aluminum alloy plate ingot.

9. An aluminum alloy foil, characterized by, The aluminum alloy foil is prepared by using the aluminum alloy according to any one of claims 1-8. 10.The aluminum alloy foil according to claim 9, wherein the yield strength of the aluminum alloy foil is not less than 143 MPa when the thickness of the aluminum alloy foil is not less than 0.095 mm; and / or the tensile strength of the aluminum alloy foil is not less than 149 MPa when the thickness of the aluminum alloy foil is not less than 0.095 mm; and / or the elongation of the aluminum alloy foil is not less than 8% when the thickness of the aluminum alloy foil is not less than 0.095 mm. The preparation method of the aluminum alloy foil comprises the following steps: T10, homogenizing heat treatment and removing the oxide skin of the aluminum alloy plate ingot; T20, multi-pass hot rolling treatment of the aluminum alloy plate ingot after the step T10 to obtain an aluminum alloy hot-rolled plate, and then air cooling to room temperature; 11. A method of producing the aluminum alloy foil according to any one of claims 9 to 10, characterized by, T30, multi-pass cold rolling treatment of the aluminum alloy hot-rolled plate to obtain a foil, and then annealing treatment, to complete the preparation of the aluminum alloy foil. 12.The preparation method of the aluminum alloy foil according to claim 11, wherein in the step T10, the aluminum alloy plate ingot is placed in a furnace with a furnace temperature of 520 ℃ to 540 ℃ for 6 h to 8 h for homogenizing heat treatment, and then the oxide skin on the surface of the aluminum alloy plate ingot is removed; and / or in the step T20, the hot rolling temperature of the aluminum alloy plate ingot is 420 ℃ to 450 ℃, and the aluminum alloy plate ingot is placed in a furnace at the hot rolling temperature for 30 min to 60 min before the hot rolling treatment; and / or in the step T20, the pass deformation of the aluminum alloy plate ingot during the hot rolling process is controlled to be 15% to 20%, and the aluminum alloy plate ingot is reheated after each pass rolling, and then is kept at 420 ℃ to 450 ℃ for 10 min to 30 min; and / or in the step T20, the thickness of the aluminum alloy hot-rolled plate is 3 mm to 5 mm; and / or in the step T30, the pass deformation of the aluminum alloy plate ingot during the cold rolling process is controlled to be 10% to 40%; and / or in the step T30, the thickness of the foil after the cold rolling treatment is 0.095 mm to 0.15 mm; and / or in the step T30, the foil obtained after the cold rolling treatment is placed in a furnace for annealing treatment at 260 ℃ to 280 ℃ for 6 h to 8 h. The heat exchanger fin is prepared by using the aluminum alloy foil according to any one of claims 9 to 10. The refrigeration equipment uses the aluminum alloy according to any one of claims 1 to 6; or the refrigeration equipment uses the aluminum alloy foil according to any one of claims 9 to 10; or the refrigeration equipment uses the heat exchanger fin according to claim 13. ​ ​ 13. A heat exchanger fin, characterized by, ​ 14. A refrigeration appliance characterized in that, ​

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