High elastic modulus anodized alloy and preparation method thereof

Abstract

The invention relates to an anodized alloy with high elasticity modulus and a preparation method thereof. The alloy comprises the following components in percentage by weight: more than or equal to 1% and less than or equal to 4% of Si, more than or equal to 2% and less than or equal to 3% of Mn, less than or equal to 1% of Fe, less than or equal to 3% of Ni, less than or equal to 0.5% of Ti, less than or equal to 0.3% of Cu and the balance of Al, and Si + Mn is more than or equal to 3%, Si + Ni is less than or equal to 4% and Ni + Fe is less than or equal to 3%. The preparation method of the alloy comprises the following steps: S1, melting metal raw materials of the alloy at the temperature of 780-800 DEG C; s2, the temperature of the alloy melt is adjusted to 750-760 DEG C, then a refining agent and a refiner are added, and the alloy melt is prepared; and S3, the alloy melt is machined and formed. While the elasticity modulus is improved, it is guaranteed that the white brightness of the alloy material after anodic oxidation treatment is larger than 65, the color difference value is smaller than 0.5, and good surface treatment performance is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of alloy materials, and in particular to an anodic oxidation alloy with a high elastic modulus and a preparation method thereof. Background Art

[0002] As foldable screen mobile phones are widely used as a new type of mobile phone product, it is estimated that by 2027, the number of foldable screen mobile phones in the world will exceed 100 million. Foldable screen mobile phones still face the problem of poor frame reliability during use. In this field, the elastic modulus of metal materials is an important indicator to measure material performance. Materials with high elastic modulus are crucial to improving the reliability of foldable screen mobile phone frames, especially anodized alloys with high elastic modulus.

[0003] At present, most of the folding screen mobile phone battery compartments and frames on the market use TC4 titanium alloy. TC4 titanium alloy is an α+β type titanium alloy with a chemical composition of Ti-6Al-4V. It has an ultra-high elastic modulus, which can greatly improve the deformation resistance of mobile phones. Its elastic modulus can reach up to 118GPa, which can meet the use requirements. However, titanium alloy is expensive, 3 to 4 times more expensive than the current aluminum alloy used in mobile phone frames, which seriously increases production costs.

[0004] Therefore, as the foldable screen mobile phone market continues to expand, in order to meet its higher standards in durability and reliability, various mobile phone manufacturers are looking for alloy products that can replace titanium alloys. In addition to the foldable screen mobile phone market, the demand for high elastic modulus metal materials in other high-end electronic materials fields is also increasing.

[0005] The elastic modulus of pure aluminum is about 70GPa. Among conventional anodized profiles, 6-series and 5-series aluminum alloys, such as 6061 and 6063, can be anodized, but the elastic modulus is generally 65-70GPa, which cannot reach above 75GPa, and thus cannot meet the use requirements. Submitting elements such as Ti, Fe, and Mn to the alloy is beneficial to improving the elastic modulus of the alloy, but these elements have a greater impact on the anodizing performance and need to be added in a controlled manner.

[0006] Therefore, it is necessary to provide a new type of high elastic modulus anodized alloy and a preparation method thereof to solve the above-mentioned defects existing in the traditional method. Summary of the invention

[0007] The main purpose of the present invention is to provide an anodic oxidation alloy with a high elastic modulus and a preparation method thereof, so as to solve the problems of high cost, insufficient elastic modulus and poor surface quality after anodizing treatment of the anodic oxidation alloy in the prior art.

[0008] In order to achieve the above-mentioned object, according to one aspect of the present invention, there is provided an anodized alloy with a high elastic modulus, which comprises the following components, in weight percentage: 1%≤Si≤4%, 2%≤Mn≤3%, Fe≤1%, Ni≤3%, Ti≤0.5%, Cu≤0.3%, and the balance is Al, wherein Si+Mn≥3%, Si+Ni≤4%, and Ni+Fe≤3%.

[0009] Furthermore, in the alloy, Ni≤1% by weight.

[0010] Furthermore, in the alloy, by weight percentage, 0.1%≤Fe≤1%.

[0011] Furthermore, in the alloy, by weight percentage, 0.1%≤Cu≤0.3%, preferably 0.1%≤Cu≤0.2%.

[0012] Furthermore, in the alloy, by weight percentage, 2%≤Si+Ni≤3%; and / or, 0.5%≤Ni+Fe≤3%.

[0013] Further, in the alloy, by weight percentage, the alloy comprises the following components: Si 2%, Mn 2%, Fe 0.5%, Ni 1%, Ti 0.2%, Cu 0.2% and the balance Al; Si 1%, Mn 3%, Fe1%, Ni 1%, Ti 0.5%, Cu 0.1% and the balance Al; or Si 1.5%, Mn 2%, Fe 0.1%, Ni0.5%, Ti 0.1%, Cu 0.2% and the balance Al.

[0014] According to another aspect of the present invention, a method for preparing the alloy of the present invention is provided, the method comprising the following steps: step S1, melting the metal raw material of the alloy at a temperature of 780-800°C; step S2, adjusting the temperature to 750-760°C, then adding a refining agent and a refiner to obtain an alloy melt; step S3, processing the alloy melt into shape.

[0015] Furthermore, the refining agent is a sodium-free powdered or block refining agent, and the refiner is AlTiB and / or AlTiC; preferably, in step S2, after adding the refining agent and the refiner, stirring is performed for 3 to 5 minutes, degassing is performed for 10 to 15 minutes, and then standing for 10 to 15 minutes; preferably, the amount of the refining agent added is 0.1 to 0.3‰ of the mass of the alloy melt, and the amount of the refiner added is 0.01 to 0.04% of the mass of the alloy melt.

[0016] Furthermore, in step S3, the alloy melt is cast at 700-730°C into a 5 mm thick plate, and is further processed into a 1.2-2 mm thick finished plate through hot rolling and cold rolling processes; or the alloy melt is directly die-casted at 720°C±10°C to form parts.

[0017] Furthermore, the elastic modulus of the finished plate or part is 75-82 GPa; preferably, the white brightness of the alloy after anodizing is greater than 65, and the color difference value is less than 0.5.

[0018] By applying the technical solution of the present invention, the elastic modulus of the finished plate or parts can reach 75 to 82 Gpa, which far exceeds the elastic modulus range of conventional anodized aluminum alloy materials (65 to 70 Gpa), and is close to or even exceeds the performance of some high-cost alloys. While improving the elastic modulus, it ensures that the white brightness of the alloy material after anodizing is greater than 65, the color difference value is less than 0.5, and it has good surface treatment performance. Compared with TC4 titanium alloy, the alloy material provided by the present invention greatly reduces the cost and provides a more cost-effective material choice for the field of high-end electronic materials, especially for applications with high requirements for aesthetics and durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 A metallographic structure photograph of the ingot of Example 1 of the present invention is shown. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below in conjunction with the embodiments.

[0022] As described in the background art, the anodized alloys in the prior art have the problems of high cost, insufficient elastic modulus, and poor surface quality after anodizing, which makes it difficult to meet the application fields with high requirements for elastic modulus and surface quality. In order to solve the above problems, in a typical embodiment of the present invention, an anodized alloy with a high elastic modulus is provided, which comprises the following components in weight percentage: 1%≤Si≤4%, 2%≤Mn≤3%, Fe≤1%, Ni≤3%, Ti≤0.5%, Cu≤0.3%, and the balance is Al, wherein Si+Mn≥3%, Si+Ni≤4%, and Ni+Fe≤3%.

[0023] The elastic modulus, also known as Young's modulus, is an important physical quantity that measures the material's ability to resist elastic deformation. Among metal materials, alloys with an elastic modulus significantly higher than that of conventional aluminum alloys (about 70 GPa) are generally called high elastic modulus alloys. The elastic modulus of the alloy of the present invention can reach 75 to 82 GPa, which is a significant improvement over conventional aluminum alloys.

[0024] In the alloy of the present invention, the addition amount of elements such as Mg and Zn is reduced, thereby suppressing the reduction of elastic modulus, and improving the elastic modulus of the material through the ratio of alloy elements. Among them, excessive addition of Si and Ni elements is likely to reduce the anodic oxidation performance of the material; Ni and Fe are likely to form large-sized second phases, deteriorate the mechanical properties of the alloy, and reduce the anodic oxidation performance; the addition of Cu element is beneficial to improving the white brightness of the alloy after anodization, but too high a content will affect the anodic oxidation performance. Through the joint regulation of Si, Fe, Mn and other elements, the alloy can be prepared by rolling and die casting, wherein the addition of Ti element is beneficial to the refinement of grains of rolled plates, and the addition of Si and Fe elements is beneficial to the filling and demolding during the die casting process.

[0025] In order to further improve the synergistic effect between alloy elements, thereby further increasing the elastic modulus of the alloy and improving the white brightness and color difference value after anodizing treatment, the present invention provides the following preferred embodiments.

[0026] In a preferred embodiment, in the alloy, Ni≤1% by weight. Typically but not limiting, the content of Ni can be 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1% or a range of any two of them. The Ni element can form a second phase with elements such as Al, Si, Mn, Fe, and Ti in aluminum alloys, which has an impact on the mechanical properties of the alloy. With the increase of Ni content, it is beneficial to improve the elastic modulus, but when the Ni content is too high, it is easy to form a large-sized second phase, which will not only deteriorate the strength and plasticity of the alloy, but also reduce the anodizing performance. By limiting the Ni content to less than 1%, the size of the second phase can be effectively controlled to avoid negative effects on the mechanical properties of the alloy while maintaining the high elastic modulus of the alloy. At the same time, controlling the Ni content at a low level helps to keep the white brightness of the material greater than 65 after anodizing and the color difference value less than 0.5, thereby meeting the high surface quality requirements.

[0027] In a preferred embodiment, in the alloy, 0.1%≤Fe≤1% by weight. Typically but not limiting, the content of Fe can be 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1% or a range of any two of them. By preferably setting the lower limit of the content of the Fe element to 0.1%, it is possible to ensure that the elastic modulus of the material remains at a high level, while providing the material with a certain strength and hardness, making it more suitable for application scenarios requiring high mechanical properties. Excessive content of the Fe element in the alloy may form relatively coarse second-phase particles, significantly reduce the mechanical properties of the alloy, and also affect the anodizing performance of the material. Therefore, the upper limit of the Fe content is set to 1%, in order to control the size and distribution of the second-phase particles formed by the Fe element, maintain the good mechanical properties and processing properties of the material, and ensure the surface quality and performance after anodizing. In addition, during the die-casting process, an appropriate amount of Fe element can improve the fluidity of the alloy, make the alloy easier to fill the mold at high temperature, and improve the molding accuracy. At the same time, Fe can also promote the demolding of the alloy in the mold, avoid mold sticking, ensure the smoothness of the part surface, and optimize the die-casting performance of the alloy, so that it can still maintain a high elastic modulus and good surface treatment performance after die-casting.

[0028] In a preferred embodiment, in the alloy, 0.1%≤Cu≤0.3% by weight. Typically but not limiting, the content of Cu can be 0.1%, 0.15%, 0.2%, 0.25%, 0.3% or a range of any two of them. Preferably, the content of Cu is 0.1% to 0.2%. The Cu element in the alloy can improve the surface white brightness of the material after anodizing. An appropriate amount of Cu content can promote the growth and formation of an oxide film under specific conditions, thereby improving the gloss and aesthetics of the material surface. Too high a Cu content will affect the anodizing performance, so limiting the Cu content to 0.3% can ensure that the white brightness after anodizing is maximized without sacrificing other properties of the alloy (such as machinability and weldability). The Cu content is preferably less than 0.2% to achieve an optimized balance between the elastic modulus of the material, the surface white brightness after anodizing, and other properties.

[0029] In a preferred embodiment, in the alloy, 2%≤Si+Ni≤3% by weight. Typically but not limiting, the sum of the contents of Si and Ni can be 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3% or a range consisting of any two of them. Both Si and Ni elements can improve the fluidity of the alloy during the die-casting process, but the content of Si and Ni elements in the alloy affects the surface quality and performance after anodizing. By controlling the total content of Si and Ni between 2% and 3%, the die-casting performance and the anodizing performance can be balanced to ensure that the material can still maintain a high elastic modulus and good surface quality after anodizing.

[0030] In a preferred embodiment, in the alloy, 0.5%≤Ni+Fe≤3% by weight. Typically but not limiting, the sum of the contents of Ni and Fe can be 0.5%, 1%, 1.5%, 2%, 2.5%, 3% or a range consisting of any two of them. Both Ni and Fe elements can play a strengthening role in aluminum alloys, but the size and distribution of the second phase particles formed by Ni and Fe elements have a direct impact on the mechanical properties and processing properties of the material. Controlling the total content of Ni and Fe below 3% helps to control the size of these strengthening phases, ensuring that the material has good processability while maintaining high strength. In addition, controlling the total content of Ni and Fe between 0.5% and 3% can balance the strengthening effect of the material with the anodizing performance, ensuring that the material can still maintain good surface quality after anodizing, such as high white brightness and low color difference.

[0031] It should be noted that although it is possible to find out the roles of various alloying elements in alloy materials from the prior art, it is not a simple task to optimize the specific proportions of these elements to a level that can achieve the best balance between material performance and processability, surface treatment effect, cost-effectiveness and heat treatment response. This requires the inventor to invest a lot of creative work and experimental verification, because the performance of alloy materials is an extremely complex and sensitive system, and there are subtle interactions between the various alloying elements. These interactions not only affect the mechanical properties of the material, but also have a direct or indirect impact on its elastic modulus, surface quality after anodizing and cost. In the present invention, by carefully designing and adjusting the specific proportions of alloying elements, the inventor aims to control the synergistic effect of these alloying elements to achieve the best comprehensive performance balance point. This process involves an in-depth understanding of the physicochemical properties of alloying elements, their solid solution and precipitation behaviors in alloys, and the effects of these behaviors on the final performance of the material. The inventor must use complex experimental design, data analysis and performance testing to finally determine an alloy composition formula that performs well in elastic modulus, surface quality after anodizing, cost control and other processing performances.

[0032] In another typical embodiment, the present invention also provides a method for preparing the above-mentioned alloy, which comprises the following steps: step S1, melting the metal raw material of the alloy at a temperature of 780-800°C; step S2, adjusting the temperature to 750-760°C, and then adding a refining agent and a refiner to obtain an alloy melt; step S3, processing the alloy melt into a shape.

[0033] Typically but not limiting, in step S1, the melting temperature of the metal raw material is 780°C, 785°C, 790°C, 795°C, 800°C or a range consisting of any two of them. Within the above temperature range, it can be ensured that all raw materials are completely melted to form a uniform alloy melt, and some impurities can be effectively volatilized. Typically but not limiting, in step S2, the temperature is adjusted to 750°C, 752°C, 754°C, 756°C, 758°C, 760°C or a range consisting of any two of them. Within the above temperature range, the temperature of the melt is lowered before adding the refining agent and the refiner, so as to create conditions for subsequent refining and refinement treatments.

[0034] Wherein, step S1 is carried out in a smelting furnace, and the metal raw material can be selected from pure aluminum ingots, Al-Si master alloys, Al-Mn master alloys, Al-Cu master alloys, Al-Ni master alloys, iron-containing master alloys, etc., and is prepared according to the alloy composition of the present invention.

[0035] In a preferred embodiment, the refining agent is selected from a sodium-free powder or block refining agent, which can be a sodium-free powder or block refining agent known in the prior art, without limitation to its specific type. For example, the sodium-free powder refining agent can contain 40 to 45 wt% of magnesium chloride, 35 to 40 wt% of potassium chloride, 5 to 15 wt% of calcium chloride, 5 to 15 wt% of barium chloride and 0 to 0.3 wt% of water; the refiner is selected from AlTiB and / or AlTiC; preferably, in step S2, after adding the refining agent and the refiner, stirring is performed for 3 to 5 minutes, degassing is performed for 10 to 15 minutes, and then standing for 10 to 15 minutes; preferably, the amount of the refining agent added is 0.1 to 0.3‰ of the mass of the alloy melt, and the amount of the refiner added is 0.01 to 0.04% of the mass of the alloy melt.

[0036] Typically but not limiting, the amount of refining agent added is 0.1‰, 0.15‰, 0.2‰, 0.25‰, 0.3‰ or a range consisting of any two of the mass of the alloy melt; the amount of refiner added is 0.01%, 0.02%, 0.03%, 0.04% or a range consisting of any two of the mass of the alloy melt.

[0037] By using refining agents and refiners, impurities in the alloy can be effectively removed, grains can be refined, and the mechanical properties and processing properties of the material can be further improved. Through degassing treatment, the pores inside the material can be effectively reduced, and the density and surface quality of the material can be improved. The static process helps to further stabilize the composition and structure of the alloy melt, reduce defects in the molding process, and improve the dimensional accuracy and mechanical properties of the finished product.

[0038] In a preferred embodiment, in step S3, the alloy melt can be subsequently processed and formed by two methods. The first method is to process it into a plate by rolling: the alloy melt is cast into a 5 mm thick plate at 700-730°C, and then further processed into a 1.2-2 mm thick finished plate through hot rolling and cold rolling processes; the second method is to directly perform die casting: the alloy melt is directly die-casted at 720°C±10°C to form parts.

[0039] Typically but not limitatively, in step S3, the casting temperature of the alloy melt is 700°C, 705°C, 710°C, 715°C, 720°C, 725°C, 730°C or a range consisting of any two of them.

[0040] Casting at a temperature of 700-730°C can improve the plasticity of the material and reduce cracks and deformation during hot rolling. In the hot rolling and cold rolling processes, multiple rolling passes can be optionally used. The finished plate with a thickness of 1.2-2 mm not only has good mechanical properties, but also facilitates subsequent processing such as cutting and stamping. The temperature of die casting is controlled at 720°C and is operated within the range of ±10°C at this temperature. Accurate temperature control can ensure the stability of the die casting process and the high quality of the finished product, and is suitable for manufacturing parts with complex shapes and high dimensional accuracy requirements.

[0041] The alloy material preparation method of the present invention is not only suitable for the production of plates, but also suitable for direct die-casting, which greatly broadens the application range of the material, improves production efficiency and reduces production costs.

[0042] The present invention can use a conventional anodizing treatment method. Anodizing can increase the hardness and wear resistance of the material surface and form an aesthetic oxide layer. Optionally, the alloy material of the present invention can also be sealed after anodizing. Sealing can prevent corrosion of the oxide layer and extend the service life of the material.

[0043] The elastic modulus of the finished plate or parts of the present invention is 75 to 82 GPa. The high elastic modulus and good mechanical properties enable it to perform well in applications subjected to extreme environments and high loads, and can provide safer and more reliable support, while also enhancing the durability and market competitiveness of the product. The alloy material of the present invention can be applied to fields that have high requirements on material strength and elastic modulus. In applications that have high requirements on material strength and elastic modulus, and require high precision and good surface quality, such as aerospace structural parts, high-performance automotive parts, precision machinery manufacturing, electronic equipment housings, etc., the performance advantages of the alloy material of the present invention are particularly obvious.

[0044] The alloy of the present invention has a white brightness greater than 65 and a color difference value less than 0.5 after anodization. The surface treatment effect of high white brightness and low color difference not only improves the aesthetics of the material, but also ensures the color consistency between different batches of products, making it a preferred material for the manufacture of high-end consumer products.

[0045] It should be additionally explained that the above-mentioned steps in the preparation method of the alloy provided by the present invention, in addition to the advantages of improving the performance of the alloy itself, are more importantly designed based on the above-mentioned specific metal element formula, and the steps can cooperate with each other, that is, as an overall solution, to achieve the performance improvement of the alloy, especially to improve the elastic modulus of the alloy, and improve the white brightness and color difference value after anodizing treatment.

[0046] The present application is further described in detail below in conjunction with specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed in the present application.

[0047] Unless otherwise defined, all professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0048] Example 1

[0049] An anodic oxidation alloy with a high elastic modulus, which comprises, by weight percentage, 2% Si, 2% Mn, 0.5% Fe, 1% Ni, 0.2% Ti, 0.2% Cu, and the balance Al. The preparation method thereof is as follows:

[0050] Step S1, prepare the metal raw materials according to the proportion of the above components, put them into a smelting furnace, and melt them at a temperature of 790°C.

[0051] Step S2, after adjusting the temperature of the molten metal raw material to 755°C, add a sodium-free powdered refining agent and a refiner AlTiB, the amount of the refining agent added is 0.2‰ of the mass of the alloy melt, the amount of the refiner added is 0.03% of the mass of the alloy melt, and stir and degas for 12 minutes. The alloy melt is left to stand for 12 minutes. The sodium-free powdered refining agent contains 44.7wt% of magnesium chloride, 38wt% of potassium chloride, 9wt% of calcium chloride, 8wt% of barium chloride and less than 0.3wt% of water.

[0052] Step S3, casting the alloy melt into a plate at 715°C. Figure 1 The metallographic structure of the ingot is shown in Figure 1. The plate is hot rolled and cold rolled to obtain a finished plate with a thickness of 1.6 mm.

[0053] Example 2

[0054] An anodic oxidation alloy with a high elastic modulus, which comprises Si 1%, Mn 3%, Fe 1%, Ni 1%, Ti 0.5%, Cu 0.1%, and the balance Al, in terms of weight percentage. The preparation method thereof is as follows:

[0055] Step S1, prepare the metal raw materials according to the proportion of the above components, put them into a smelting furnace, and melt them at a temperature of 795°C.

[0056] Step S2, after adjusting the temperature of the molten metal raw material to 760°C, adding a sodium-free block refining agent and a refiner AlTiC, the amount of the refining agent added is 0.3‰ of the mass of the alloy melt, and the amount of the refiner added is 0.04% of the mass of the alloy melt, and stirring and degassing are performed, and the degassing time is 15 minutes. The alloy melt is left to stand for 15 minutes. Among them, the sodium-free powdered refining agent contains 40.3wt% of magnesium chloride, 40wt% of potassium chloride, 10wt% of calcium chloride, 9.5wt% of barium chloride and 0.2wt% of water.

[0057] Step S3, subjecting the alloy melt to die-casting at 720°C.

[0058] Example 3

[0059] An anodic oxidation alloy with a high elastic modulus, which comprises, by weight percentage, 1.5% Si, 2% Mn, 0.1% Fe, 0.5% Ni, 0.1% Ti, 0.2% Cu, and the balance Al. The preparation method thereof is as follows:

[0060] Step S1, prepare the metal raw materials according to the proportion of the above components, put them into a smelting furnace, and melt them at a temperature of 785°C.

[0061] Step S2, after adjusting the temperature of the molten metal raw material to 752°C, add a sodium-free powdered refining agent and a refiner AlTiB, the amount of the refining agent added is 0.15‰ of the mass of the alloy melt, the amount of the refiner added is 0.02% of the mass of the alloy melt, and stir and degas for 10 minutes. The alloy melt is left to stand for 10 minutes. The sodium-free powdered refining agent contains 44.5wt% of magnesium chloride, 40wt% of potassium chloride, 10.2wt% of calcium chloride, 5wt% of barium chloride and 0.3wt% of water.

[0062] Step S3, casting the alloy melt into a plate at 725° C. The plate is hot-rolled and cold-rolled to make the thickness of the finished plate 1.4 mm.

[0063] Example 4

[0064] An anodic oxidation alloy with a high elastic modulus, which comprises, by weight percentage, 3% Si, 2% Mn, 0.5% Fe, 0.2% Ti, 0.2% Cu, and the balance Al. The preparation method thereof is as follows:

[0065] Step S1, prepare the metal raw materials according to the proportion of the above components, put them into a smelting furnace, and melt them at a temperature of 800°C.

[0066] Step S2: After adjusting the temperature of the melted metal raw materials to 758 °C, add a sodium-free massive refining agent and a grain refiner AlTiC. The addition amount of the refining agent is 0.25‰ of the mass of the alloy melt, and the addition amount of the grain refiner is 0.04% of the mass of the alloy melt. Then stir and degas for 13 minutes. Let the alloy melt stand for 13 minutes. Among them, the sodium-free powdered refining agent contains 45 wt% of magnesium chloride, 38 wt% of potassium chloride, 5 wt% of calcium chloride, 11.8 wt% of barium chloride, and 0.2 wt% of moisture.

[0067] Step S3: Carry out die-casting molding on the alloy melt at 725 °C.

[0068] Example 5

[0069] The difference between Example 5 and Example 1 lies in the different alloy component ratios. By weight percentage, its components are Si 2%, Mn 2%, Ni 1%, Ti 0.2%, Cu 0.2%, and the balance is Al. And the steps of the preparation method are the same as those in Example 1.

[0070] Example 6

[0071] The difference between Example 6 and Example 1 lies in the different alloy component ratios. By weight percentage, its components are Si 2%, Mn 2%, Fe 0.5%, Ni 2%, Ti 0.2%, Cu 0.2%, and the balance is Al. And the steps of the preparation method are the same as those in Example 1.

[0072] Example 7

[0073] The difference between Example 7 and Example 1 lies in the different alloy component ratios. By weight percentage, its components are Si 2%, Mn 2%, Fe 0.5%, Ni 1%, Ti 0.2%, Cu 0.3%, and the balance is Al. And the steps of the preparation method are the same as those in Example 1.

[0074] Example 8

[0075] The difference between Example 8 and Example 1 lies in the different alloy component ratios. By weight percentage, its components are Si 2%, Mn 2%, Fe 0.5%, Ni 1%, Ti 0.2%, and the balance is Al. And the steps of the preparation method are the same as those in Example 1.

[0076] Example 9

[0077] The difference between Example 9 and Example 3 is that the alloy composition ratio is different, and the composition is Si1%, Mn 2%, Fe 1%, Ni 0.5%, Ti 0.2%, Cu 0.2%, and the balance Al in weight percentage. The steps of the preparation method are the same as those of Example 3.

[0078] Example 10

[0079] The difference between Example 10 and Example 1 is that the alloy composition ratio is different, and the composition is Si2%, Mn 2%, Fe 0.1%, Ni 0.3%, Ti 0.2%, Cu 0.2%, and the balance Al in weight percentage. The steps of the preparation method are the same as those of Example 1.

[0080] Comparative Example 1

[0081] The difference between Comparative Example 1 and Example 3 is that the alloy composition ratio is different, and the composition is Si4.5%, Mn 2%, Fe 0.1%, Ni 0.5%, Ti 0.1%, Cu 0.2%, and the balance Al in weight percentage. The steps of the preparation method are the same as those of Example 3.

[0082] Comparative Example 2

[0083] The difference between Comparative Example 2 and Example 2 is that the alloy composition ratio is different, and the composition is Si0.5%, Mn 3%, Fe 1%, Ni 1%, Ti 0.5%, Cu 0.1%, and the balance Al in weight percentage. The steps of the preparation method are the same as those of Example 2.

[0084] Comparative Example 3

[0085] The difference between Comparative Example 3 and Example 2 is that the alloy composition ratio is different, and the composition is Si2%, Mn 1.5%, Fe 0.5%, Ni 1%, Ti 0.2%, Cu 0.2%, and the balance Al in weight percentage. The steps of the preparation method are the same as those of Example 2.

[0086] Comparative Example 4

[0087] The difference between Comparative Example 4 and Example 2 is that the alloy composition ratio is different, and the composition is Si1%, Mn 3.5%, Fe 1%, Ni 1%, Ti 0.5%, Cu 0.1%, and the balance Al in weight percentage. The steps of the preparation method are the same as those of Example 2.

[0088] Comparative Example 5

[0089] The difference between Comparative Example 5 and Example 1 is that the alloy composition ratio is different, and the composition is Si2%, Mn 2%, Fe 1.5%, Ni 1%, Ti 0.2%, Cu 0.2%, and the balance Al in weight percentage. The steps of the preparation method are the same as those of Example 1.

[0090] Comparative Example 6

[0091] The difference between Comparative Example 6 and Example 2 is that the alloy composition ratio is different, and the composition is Si1%, Mn 3%, Fe 1%, Ni 3.5%, Ti 0.5%, Cu 0.1%, and the balance Al in weight percentage. The steps of the preparation method are the same as those of Example 2.

[0092] Comparative Example 7

[0093] The difference between Comparative Example 7 and Example 1 is that the alloy composition ratio is different, and the composition is Si2%, Mn 2%, Fe 0.5%, Ni 1%, Ti 0.55%, Cu 0.2%, and the balance Al in weight percentage. The steps of the preparation method are the same as those of Example 1.

[0094] Comparative Example 8

[0095] The difference between Comparative Example 8 and Example 1 is that the alloy composition ratio is different, and the composition is Si2%, Mn 2%, Fe 0.5%, Ni 1%, Ti 0.2%, Cu 0.35%, and the balance Al in weight percentage. The steps of the preparation method are the same as those of Example 1.

[0096] Comparative Example 9

[0097] The difference between Comparative Example 9 and Example 2 is that the alloy composition ratio is different, and the composition is Si1%, Mn 1.5%, Fe 1%, Ni 1%, Ti 0.5%, Cu 0.1%, and the balance Al in weight percentage. The steps of the preparation method are the same as those of Example 2.

[0098] Comparative Example 10

[0099] The difference between Comparative Example 10 and Example 2 is that the alloy composition ratio is different, and the composition is Si1%, Mn 3%, Fe 1%, Ni 2.5%, Ti 0.5%, Cu 0.1%, and the balance Al in weight percentage. The steps of the preparation method are the same as those of Example 2.

[0100] The ingredients of the above embodiments and comparative examples can be found in Table 1 and Table 2, wherein the units of the values ​​are weight percentages.

[0101] Table 1

[0102] Si Mn Fe Ni Ti Cu Al Si+Mn Si+Ni Ni+Fe Example 1 2 2 0.5 1 0.2 0.2 margin 4 3 1.5 Example 2 1 3 1 1 0.5 0.1 margin 4 2 2 Example 3 1.5 2 0.1 0.5 0.1 0.2 margin 3.5 2 0.6 Example 4 3 2 0.5 0 0.2 0.2 margin 5 3 0.5 Example 5 2 2 0 1 0.2 0.2 margin 4 3 1 Example 6 2 2 0.5 2 0.2 0.2 margin 4 4 2.5 Example 7 2 2 0.5 1 0.2 0.3 margin 4 3 1.5 Example 8 2 2 0.5 1 0.2 0 margin 4 3 1.5 Example 9 1 2 1 0.5 0.2 0.2 margin 3 1.5 1.5 Example 10 2 2 0.1 0.3 0.2 0.2 margin 4 2.3 0.4

[0103] Table 2

[0104] Si Mn Fe Ni Ti Cu Al Si+Mn Si+Ni Ni+Fe Comparative Example 1 4.5 2 0.1 0.5 0.1 0.2 margin 6.5 5 0.6 Comparative Example 2 0.5 3 1 1 0.5 0.1 margin 3.5 1.5 2 Comparative Example 3 2 1.5 0.5 1 0.2 0.2 margin 3.5 3 1.5 Comparative Example 4 1 3.5 1 1 0.5 0.1 margin 4.5 2 2 Comparative Example 5 2 2 1.5 1 0.2 0.2 margin 4 3 2.5 Comparative Example 6 1 3 1 3.5 0.5 0.1 margin 4 4.5 4.5 Comparative Example 7 2 2 0.5 1 0.55 0.2 margin 4 3 1.5 Comparative Example 8 2 2 0.5 1 0.2 0.35 margin 4 3 1.5 Comparative Example 9 1 1.5 1 1 0.5 0.1 margin 2.5 2 2 Comparative Example 10 1 3 1 2.5 0.5 0.1 margin 4 3.5 3.5

[0105] Test method:

[0106] Elastic modulus: According to GB / T 2039-2011, the elastic modulus of the alloy specimens is tested using an electronic universal material testing machine equipped with a high-precision load sensor and displacement sensor. The alloy specimens are rectangular standard specimens prepared from finished plates or parts according to GB / T228.1.

[0107] Anodizing: Anodizing is carried out according to GB / T 8013.1-2018.

[0108] White brightness: According to GB / T 12967.6-2022, using integrating sphere spectrophotometer d / 8, light source D65, test aperture 25mm, observer angle 60°; test mode uses SCI: including specular reflection mode.

[0109] Color difference: measured according to GB / T 11943-2002 using an integrating sphere colorimeter.

[0110] The above tests were performed on the aluminum alloy materials obtained in each embodiment and comparative example, and the obtained results are shown in Table 3 and Table 4.

[0111] Table 3

[0112] Elastic modulus White brightness Color difference value Example 1 76.9 68 0.42 Example 2 76.8 67 0.46 Example 3 76 73 0.38 Example 4 77.1 75 0.36 Example 5 76.2 70 0.44 Example 6 79 65 0.49 Example 7 77 69 0.42 Example 8 76.8 67 0.42 Example 9 75.5 71 0.39 Example 10 75.2 76 0.36

[0113] Table 4

[0114] Elastic modulus White brightness Color difference value Comparative Example 1 77.9 60 0.4 Comparative Example 2 76.1 58 0.42 Comparative Example 3 65.3 69 0.53 Comparative Example 4 77.1 65 0.65 Comparative Example 5 78 64 0.47 Comparative Example 6 79.5 61 0.62 Comparative Example 7 77.3 65 0.57 Comparative Example 8 77.02 62 0.42 Comparative Example 9 70.8 73 0.4 Comparative Example 10 79.5 59 0.68

[0115] From the above description, it can be seen that the above-mentioned embodiments of the present invention obtain an alloy material with high elastic modulus and excellent surface quality. The present invention can meet applications with high requirements for aesthetics and durability. Compared with the comparative example, the embodiments of the present invention improve the elastic modulus of the alloy by carefully designing the alloy element ratio and controlling the synergistic effect of the alloy elements, while optimizing the surface quality after anodization, such as high white brightness and low color difference value.

[0116] Compared with the prior art, such as traditional 6-series and 5-series aluminum alloys, the alloy of the present invention not only has an elastic modulus increased from 65-70GPa to 75-82GPa, which is closer to TC4 titanium alloy, greatly improving the material's resistance to deformation, but also maintains the surface treatment advantages of anodization, with a white brightness exceeding 65 and a color difference value less than 0.5, which has significant advantages in the application of high-end electronic products. In addition, the alloy composition of the present invention is not only suitable for the production of sheet materials, but also for direct die-casting, which greatly broadens the application range of the material, improves production efficiency, and reduces production costs, which is of great significance for large-scale manufacturing. Therefore, while improving the performance of the material, the present invention takes into account both economy and processability, showing a broad application prospect in the field of high-end electronic materials.

[0117] Through the comparative experiments of the above-mentioned various embodiments and comparative examples, the influence of different component ratios on the performance of alloy materials can be more comprehensively explored. These data not only help to improve the technical solution of this application, but also provide a basis for subsequent industrial-scale production.

[0118] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anodic oxidation alloy with a high elastic modulus, characterized in that: The alloy comprises the following components in weight percentage: 1%≤Si≤4%, 2%≤Mn≤3%, Fe≤1%, Ni≤3%, Ti≤0.5%, Cu≤0.3%, and the balance is Al, wherein Si+Mn≥3%, Si+Ni≤4%, and Ni+Fe≤3%.

2. The alloy according to claim 1, characterized in that In the alloy, Ni≤1%.

3. The alloy according to claim 1, characterized in that In the alloy, 0.1%≤Fe≤1%.

4. The alloy according to claim 1, characterized in that In the alloy, 0.1%≤Cu≤0.3%, preferably 0.1%≤Cu≤0.2%.

5. The alloy according to any one of claims 1 to 4, characterized in that In the alloy, 2%≤Si+Ni≤3%; And / or, 0.5%≤Ni+Fe≤3%.

6. The alloy according to claim 1, characterized in that In the alloy, the alloy comprises the following components by weight percentage: Si 2%, Mn 2%, Fe 0.5%, Ni 1%, Ti 0.2%, Cu 0.2% and the balance Al; Si 1%, Mn 3%, Fe 1%, Ni 1%, Ti 0.5%, Cu 0.1% and the balance Al; or Si 1.5%, Mn 2%, Fe 0.1%, Ni 0.5%, Ti 0.1%, Cu 0.2%, and the balance Al.

7. A method for preparing an alloy according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: Step S1, melting the metal raw material of the alloy at a temperature of 780-800° C.; Step S2, adjusting the temperature to 750-760° C., then adding a refining agent and a refiner to obtain an alloy melt; Step S3, forming the alloy melt.

8. The preparation method according to claim 7, characterized in that: The refining agent is a sodium-free powder or block refining agent, and the refiner is AlTiB and / or AlTiC; preferably, in step S2, after adding the refining agent and the refiner, stirring is performed for 3 to 5 minutes, degassing is performed for 10 to 15 minutes, and then standing for 10 to 15 minutes; preferably, the amount of the refining agent added is 0.1 to 0.3‰ of the mass of the alloy melt, and the amount of the refiner added is 0.01 to 0.04% of the mass of the alloy melt.

9. The preparation method according to claim 7 or 8, characterized in that: In step S3, the alloy melt is cast at 700-730°C into a 5 mm thick plate, and is further processed into a 1.2-2 mm thick finished plate through hot rolling and cold rolling processes; or the alloy melt is directly die-casted at 720°C±10°C to form parts.

10. The preparation method according to claim 9, characterized in that: The elastic modulus of the finished plate or the part is 75-82 GPa; preferably, the white brightness of the alloy after anodization is greater than 65, and the color difference value is less than 0.5.

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