A kind of additive manufacturing method based on aluminum alloy wire

Abstract

The present application discloses an additive manufacturing method based on aluminum alloy wire, comprising the following steps: preparing a semi-solid aluminum alloy melt, stirring the semi-solid aluminum alloy melt, adding solid particles during the stirring process to prepare an aluminum alloy wire; using the aluminum alloy wire as a raw material, constructing an additive with a cavity by a three-dimensional model printing method; filling the cavity with a metal melt, and after the filling is completed, heat treating the additive; wherein the solid phase fraction of the semi-solid aluminum alloy melt is 30% to 60%, and the thermal expansion coefficient is 23×10 ‑6 / ℃~24×10 ‑6 / ℃; the solid particles include at least one of SiC and Si3N4; the thermal expansion coefficient of the metal melt is 21×10 ‑6 / ℃~23.4×10 ‑6 / ℃.

Description

Technical Field

[0001] The present application relates to the technical field of additive manufacturing, and in particular to an additive manufacturing method based on aluminum alloy wire. Background Art

[0002] Additive Manufacturing (AM) is a technology that manufactures products by accumulating materials. In contrast to traditional subtractive manufacturing (such as removing materials from a blank by cutting, milling, etc. to obtain the final shape), additive manufacturing builds a three-dimensional object from scratch by adding materials layer by layer. For example, in traditional machining, to make a metal additive, you may start with a piece of raw metal, remove excess material by turning, grinding, etc., and finally form the shape of the additive. Additive manufacturing, on the other hand, is to stack materials (which can be metal powder, plastic filaments, etc.) layer by layer according to the designed three-dimensional model data until a complete additive is formed.

[0003] Additive manufacturing technology based on aluminum alloy wire is an advanced manufacturing method that builds three-dimensional structures by depositing materials layer by layer. It is widely used in industries such as aerospace, automobiles, and molds. However, the main manufacturing methods used include powder sintering and wire melting welding, which have low production efficiency and high cost, and cannot be applied on a large scale.

[0004] Airbus, Boeing and other companies have disclosed in patents (such as US10807323B2) the use of 3D printing methods to form objects, specifically recording the use of thermoplastic materials as shell materials, and strong solid materials or thermosetting resins as fillers for the shell cavity, thereby increasing the rigidity of the 3D object. However, if metal products are also manufactured using this manufacturing process, there will be many problems: for example, the interface bonding between the filler and the inner wall of the cavity is weak, and it is easy to detach when subjected to external forces or large temperature changes. This method cannot be directly applied to the manufacture of metal additives.

[0005] Therefore, the research and development of high-performance and efficient additive manufacturing methods in the metal field is of vital importance. In view of this, this application is specially proposed. Summary of the invention

[0006] Based on this, one or more embodiments of the present application provide an additive manufacturing method based on aluminum alloy wire, which has high preparation efficiency and can prepare high-performance additive materials.

[0007] On the one hand, the present application provides an additive manufacturing method based on aluminum alloy wire, comprising the following steps:

[0008] A semi-solid aluminum alloy melt is prepared, the semi-solid aluminum alloy melt is stirred, and solid particles are added during the stirring process to prepare an aluminum alloy wire.

[0009] The aluminum alloy wire is used as a raw material, and an additive material with a cavity is constructed by a three-dimensional model printing method.

[0010] The cavity is filled with a metal melt, and after the filling is completed, the additive material is heat treated.

[0011] The solid phase fraction of the semi-solid aluminum alloy melt is 30% to 60%, and the thermal expansion coefficient is 23×10 -6 / ℃~24×10 -6 / ℃.

[0012] In a specific example, the solid particles include SiC or Si 3 N 4 .

[0013] The thermal expansion coefficient of the metal melt is 21×10 -6 / ℃~23×10 -6 / ℃.

[0014] In a specific example, the solid phase fraction of the semi-solid aluminum alloy melt is 50% to 60%, and the thermal expansion coefficient is 23.4×10 -6 / ℃~24×10 -6 / ℃.

[0015] In a specific example, the solid particles are SiC, and the thermal expansion coefficient of the metal melt is 21.4×10 -6 / ℃~23.4×10 -6 / ℃.

[0016] In a specific example, the solid phase fraction of the solid particles is 0.5% to 1.5%.

[0017] In a specific example, the heat treatment includes T4 heat treatment or T6 heat treatment.

[0018] In a specific example, the particle size of the solid particles is 10 μm to 200 μm.

[0019] In a specific example, the semi-solid aluminum alloy melt is a 6013 aluminum alloy melt.

[0020] In a specific example, the metal melt is A356.2 metal melt.

[0021] In a specific example, the three-dimensional model printing includes printing using arc additive manufacturing technology.

[0022] On the other hand, the present application provides an additive material prepared by an additive manufacturing method based on aluminum alloy wire.

[0023] At present, there is no filling-type additive preparation method applied to the field of metal additives. Traditional metal additive preparation methods are all one-time molding. However, this type of preparation method is costly and inefficient, and its performance is not as good as parts obtained by traditional casting processes. Secondly, if a metal material is first used to make the shell, and then a liquid or semi-solid metal material is input to fill the cavity, the interface bonding force between the filler and the inner wall of the cavity is weak, and it is easy to break or separate from the inside and outside when subjected to external force or large temperature changes, especially when the thermal expansion coefficient of the shell and filler materials is large. Conventional composite sheets can improve the bonding strength of the composite sheets by roughening the surface of one of the sheets, but the inner wall of the cavity of some complex parts is difficult to surface treat by existing technology to improve the interface bonding effect, so it is difficult to improve the interface bonding force between the shell and the filler.

[0024] The present application research discovered a method for preparing additive materials, which uses special aluminum alloy wires for additive manufacturing. First, a semi-solid aluminum alloy melt with a specific thermal expansion coefficient is mixed with solid particles to construct an additive material with a cavity, and then a metal melt with a specific thermal expansion coefficient is used to fill the cavity.

[0025] Furthermore, when the metal melt is filling the cavity, heat exchange will occur between the metal melt and the inner wall of the shell, causing the latter's temperature to rise rapidly and then decrease after the filling is completed. Since the thermal expansion coefficients of the solid particles and the aluminum alloy are quite different, during the heating and cooling process of the inner wall, pores will be generated between the particles and the aluminum alloy, and the liquid phase of the metal melt can enter the pores, thereby promoting the physical integration of the metal melt and the inner wall, achieving improved interface bonding strength, and thus improving the mechanical properties of the additive.

[0026] At the same time, when the thermal expansion coefficients of the molten metal and the aluminum alloy material of the shell are greatly different, because the composite structure formed between the molten metal and the aluminum alloy material of the shell containing solid particles has a step-change thermal expansion coefficient, it can also alleviate the cracking problem caused by the large difference in thermal expansion coefficients between the shell and the filling material.

[0027] The additive material produced by the additive production method of the embodiment of the present application has the advantages of high precision, high strength and high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 Flow chart of preparing additive materials by the additive manufacturing process of an embodiment of the present application.

[0030] Figure 2 These are the tensile strain test results of the additives prepared in Example 1 and Comparative Examples 1 to 4 of the present application. DETAILED DESCRIPTION

[0031] The present application will be further described below in conjunction with the embodiments and examples. It should be understood that these examples are only used to illustrate the present application and are not intended to limit the scope of the present application. In addition, it should be understood that after reading the content taught in the present application, those skilled in the art may make various changes or modifications to the present application, and these equivalent forms also fall within the protection scope of the claims attached to the present application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0033] the term

[0034] Unless otherwise specified or incompatible herewith, the terms and phrases used herein shall have the following meanings:

[0035] The term "and / or" used in this article includes any one of two or more related listed items, and also includes any and all combinations of the related listed items, wherein any and all combinations include any two related listed items, any more related listed items, or a combination of all related listed items.

[0036] In this application, "optionally" and the like are used for descriptive purposes to indicate differences in content, but should not be construed as limiting the scope of protection of this application.

[0037] In this application, the terms "first", "second", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first", "second", etc. only serve the purpose of non-exhaustive enumeration and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0038] In the present application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0039] In this application, when it comes to numerical intervals (i.e., numerical ranges), unless otherwise specified, the optional numerical distribution is considered continuous within the above numerical interval, and includes the two numerical endpoints (i.e., the minimum and maximum values) of the numerical range, and each numerical value between the two numerical endpoints. Unless otherwise specified, when the numerical interval only refers to integers within the numerical interval, it includes the two endpoint integers of the numerical range, and each integer between the two endpoints. In addition, when multiple ranges are provided to describe features or characteristics, these ranges can be combined. In other words, unless otherwise specified, the ranges disclosed herein should be understood to include any and all subranges included therein.

[0040] All documents mentioned in this application are cited as references in this application, just as each document is cited as reference separately. Unless they conflict with the application purpose and / or technical solution of this application, the cited documents involved in this application are cited with all contents and all purposes. When the cited documents are involved in this application, the definitions of relevant technical features, terms, nouns, phrases, etc. in the cited documents are also cited. When the cited documents are involved in this application, the examples and preferred methods of the cited relevant technical features can also be incorporated into this application as references, but are limited to the implementation of this application. It should be understood that when the cited content conflicts with the description in this application, the present application shall prevail or be modified adaptively according to the description of this application.

[0041] The temperature parameters in this application, unless otherwise specified, are allowed to be either constant temperature treatment or to vary within a certain temperature range. It should be understood that the constant temperature treatment allows the temperature to fluctuate within the accuracy range controlled by the instrument. Fluctuations within the range of ±5°C, ±4°C, ±3°C, ±2°C, and ±1°C are allowed.

[0042] In the present application, weight may be μg, mg, g, kg or other mass units known in the chemical industry.

[0043] In the present application, unless otherwise specified, the size, particle size and diameter generally refer to the average value.

[0044] The following are some specific embodiments.

[0045] For experimental parameters not specified in the following specific embodiments, reference is made to the instructions given in the present application document, and reference may also be made to experimental manuals in the art or other experimental methods known in the art, or to experimental conditions recommended by manufacturers.

[0046] The raw materials and reagents involved in the following specific examples can be obtained from commercial sources, or can be prepared by those skilled in the art according to known methods.

[0047] On the one hand, the present application provides an additive manufacturing method based on aluminum alloy wire, comprising the following steps:

[0048] S10, preparing a semi-solid aluminum alloy melt, and stirring the semi-solid aluminum alloy melt.

[0049] S20, adding solid particles while stirring to prepare aluminum alloy wire.

[0050] S30, using the aluminum alloy wire as a raw material, and constructing an additive material with a cavity by means of three-dimensional model printing.

[0051] S40, filling the cavity with molten metal.

[0052] S50, after the filling is completed, the additive material is heat treated.

[0053] Among them, the solid phase fraction of the semi-solid aluminum alloy melt is 30%~60%, and the thermal expansion coefficient is 23×10 -6 / ℃~24×10 -6 / ℃. For example, the solid phase fraction of the semi-solid aluminum alloy melt is 30%, 35%, 40%, 35%, 50%, 55% or 60%, and the thermal expansion coefficient is 23×10 -6 / ℃、23.1×10 -6 / ℃、23.2×10 -6 / ℃、23.3×10 -6 / ℃、23.4×10 -6 / ℃、23.5×10 -6 / ℃、23.6×10 -6 / ℃、23.7×10 -6 / ℃、23.8×10 -6 / ℃、23.9×10 -6 / ℃、24×10 -6 / ℃.

[0054] The thermal expansion coefficient of solid particles is 3×10 -6 / ℃~5×10 -6 / ℃. For example, the thermal expansion coefficient of solid particles is 3×10 -6 / ℃、3.1×10 -6 / ℃、3.2×10 -6 / ℃、3.3×10 -6 / ℃、3.4×10 -6 / ℃、3.5×10 -6 / ℃、3.6×10 -6 / ℃、3.7×10 -6 / ℃、3.8×10 -6 / ℃、3.9×10 -6 / ℃、4×10 -6 / ℃、4.1×10 -6 / ℃、4.2×10 -6 / ℃、4.3×10 -6 / ℃、4.4×10 -6 / ℃、4.5×10 -6 / ℃、4.6×10 -6 / ℃、4.7×10 -6 / ℃、4.8×10 -6 / ℃、4.9×10 -6 / ℃ or 5.0×10 -6 / ℃.

[0055] The thermal expansion coefficient of the metal melt is 21×10 -6 / ℃~23.4×10 -6 / ℃. For example, the thermal expansion coefficient of a molten metal is 21×10 -6 / ℃、21.2×10 -6 / ℃、21.4×10 -6 / ℃、21.6×10 -6 / ℃、21.8×10 -6 / ℃、22×10 -6 / ℃、22.2×10 -6 / ℃、22.4×10 -6 / ℃、22.6×10 -6 / ℃、22.8×10 -6 / ℃、23×10 -6 / ℃、23.2×10 -6 / ℃ and 23.4×10 -6 / ℃.

[0056] In a specific example, the solid phase fraction of the semi-solid aluminum alloy melt is 50% to 60%, and the thermal expansion coefficient is 23.4×10 -6 / ℃~24×10 -6 / ℃.

[0057] In a specific example, the thermal expansion coefficient of the solid particles is 4.4×10 -6 / ℃~4.6×10 -6 / ℃.

[0058] Optionally, the thermal expansion coefficient of the metal melt is 22.4×10 -6 / ℃~23.4×10 -6 / ℃.

[0059] In a specific example, the solid fraction of the solid particles is 0.5% to 1.5%, for example, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4% or 1.5%.

[0060] In a specific example, the solid particles include SiC or Si 3 N 4 .

[0061] In a specific example, the particle size of the solid particles is 10 μm to 200 μm. For example, the particle size of the solid particles is 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm or 200 μm.

[0062] In a specific example, the semi-solid aluminum alloy melt is a 6013 aluminum alloy melt. 6013 aluminum alloy is a medium-strength heat-treatable strengthening alloy, and its melt generally refers to a liquid or semi-solid aluminum alloy in the process of smelting or heating. The melting point of 6013 aluminum alloy is between 550°C and 650°C. The main components of this alloy include elements such as aluminum, copper, manganese and silicon, and the specific chemical composition is as follows (the percentages of metal components involved in this application refer to mass fractions): magnesium (Mg): 0.8%~1.0%, silicon (Si): 0.6%~1.0%, copper (Cu): 0.6%~1.1%, manganese (Mn): 0.20%~0.8%, iron (Fe): up to 0.50%, zinc (Zn): up to 0.25%, chromium (Cr): up to 0.10%, titanium (Ti): up to 0.10% other impurities: up to 0.05% each, up to 0.15% in total, aluminum (Al): balance.

[0063] Among them, 6013 aluminum alloy has good plasticity and mechanical properties, as well as good corrosion resistance and thermal conductivity. In the molten state, 6013 aluminum alloy can be cast and deformed, and is widely used in automobile manufacturing, construction, aerospace and other fields. For example, in automobile manufacturing, 6013 aluminum alloy is often used in the manufacture of body structures and parts. Due to its lightweight and high strength characteristics, it helps to improve the fuel efficiency and operating performance of automobiles.

[0064] In a specific example, the metal melt is A356.2 metal melt, wherein the composition of the A356.2 metal melt includes silicon (Si) 6.5%-7.5%, magnesium (Mg) 0.3%-0.45%, iron (Fe) ≤0.12%, manganese (Mn) ≤0.05%, copper (Cu) ≤0.1%, titanium (Ti) ≤0.2%, zinc (Zn) ≤0.05%, and aluminum (Al) as the balance.

[0065] In a specific example, the three-dimensional model printing includes printing using arc additive manufacturing technology.

[0066] In a specific example, the heat treatment method includes T4 heat treatment and T6 heat treatment, and those skilled in the art can select one according to needs.

[0067] Arc additive manufacturing technology is a 3D printing technology that uses arc heat as the heat source and wire as consumables. By controlling the welding equipment, the material is welded layer by layer to form the required metal parts.

[0068] On the other hand, the present application provides an additive material prepared by an additive manufacturing method based on aluminum alloy wire.

[0069] On the other hand, the present application provides applications of the additive in the fields of aerospace, automobiles, and molds.

[0070] The embodiments of the present application will be described in detail below in conjunction with examples. It should be understood that these examples are only used to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for which specific conditions are not specified in the following examples are preferably referred to the guidance provided in the present application, and can also be based on the experimental manual or normal conditions in this area, can also be based on the conditions recommended by the manufacturer, or refer to experimental methods known in the art.

[0071] In the following specific embodiments, the measured parameters of raw material components may have slight deviations within the range of weighing accuracy unless otherwise specified. For temperature and time parameters, acceptable deviations caused by instrument test accuracy or operation accuracy are allowed.

[0072] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0073] 1. Implementation Examples

[0074] Example 1: This example provides an additive material S1 based on aluminum alloy wire of the present application, which is prepared by the preparation method of the additive material based on aluminum alloy wire of the present application, comprising the following steps:

[0075] (1) A semi-solid 6013 aluminum alloy melt was prepared (the composition of the 6013 aluminum alloy was: by weight, 1% magnesium, 0.6% silicon, 0.60% copper, 0.10% titanium, 0.30% manganese, 0.25% zinc, and the balance was aluminum). The solid phase fraction of the semi-solid 6013 aluminum alloy melt was 30%, and the thermal expansion coefficient was 23.4×10 -6 / ℃.

[0076] (2) The semi-solid 6013 aluminum alloy melt was stirred, and a mass fraction of 1% and a thermal expansion coefficient of 4.4×10 -6 / ℃, SiC with a particle size of 100μm, is stirred evenly to prepare aluminum alloy wire.

[0077] (3) Using aluminum alloy wire as raw material, an additive material with a cavity of a preset shape is printed by arc additive manufacturing (the cavity accounts for 75% of the volume of the additive material. Those skilled in the art can adjust the volume ratio of the cavity as needed, such as 5-90%, as long as the shell of the additive material can be prevented from deformation during the casting process). The part of this embodiment is a gear. The parameters of arc additive manufacturing are: current 120A, voltage 12V, deposition speed 500mm / min, argon atmosphere.

[0078] (4) The preparation temperature is 680°C and the thermal expansion coefficient is 21.4×10 -6 / ℃ A356.2 aluminum alloy melt (the composition of A356.2 aluminum alloy is: by weight fraction, 6.5% silicon, 0.4% magnesium, 0.1% titanium, 0.08% iron, 0.05% copper, 0.02% manganese, 0.04% zinc, and the balance is aluminum), and the cavity is filled with the metal melt.

[0079] (5) After filling, the material is subjected to T6 heat treatment.

[0080] Example 2: This example provides an additive material S2 based on aluminum alloy wire, which is prepared in the same manner as in Example 1, except that in step (4), the A356.2 melt is replaced by an A356.2 semi-solid melt with a solid phase fraction of 50%, and the composition of the alloy remains unchanged.

[0081] Example 3: This example provides an additive material S3 based on aluminum alloy wire, which is prepared in the same manner as in Example 1, except that SiC in step (2) is replaced by Si 3 N 4 , the thermal expansion coefficient is 3.2×10 -6 / ℃, 0.5% Si by mass fraction was added to the semi-solid alloy melt. 3 N 4 , the solid phase fraction of the semi-solid aluminum alloy melt is 60%.

[0082] Example 4: This example provides an additive material S4 based on aluminum alloy wire, which is prepared in the same manner as in Example 1, except that in step (4), the A356.2 melt is replaced by 6013 aluminum alloy, and the thermal expansion coefficient is 23.4×10 -6 / ℃, the composition of the 6013 aluminum alloy is: by weight, 1% magnesium, 0.6% silicon, 0.60% copper, 0.10% titanium, 0.30% manganese, 0.25% zinc, and the balance is aluminum.

[0083] Example 5: This example provides an additive material S5 based on aluminum alloy wire, which is prepared in the same manner as in Example 1, except that in step (2), the size of SiC is 10 μm, and the mass fraction of SiC in the semi-solid alloy melt is 1.5%.

[0084] Comparative Example 1: This comparative example provides another additive preparation method, and the additive D1 is prepared in a manner similar to that of Example 1, except that the step (2) of adding SiC is not performed.

[0085] Comparative Example 2: This comparative example provides another additive preparation method to prepare additive D2, which is prepared in a similar manner to Example 1, except that SiC in step (2) is replaced by copper, and the thermal expansion coefficient is 16.5×10 -6 / ℃.

[0086] Comparative Example 3: This comparative example provides another additive preparation method to prepare additive material D3, which is prepared in a similar manner to Example 1, except that the A356.2 aluminum alloy melt in step (4) is replaced with 4032 aluminum alloy, and the thermal expansion coefficient is 19.4×10 -6 / ℃, the composition is: by weight, 12.5% ​​silicon, 1% copper, 1.3% magnesium, 0.2% zinc, 0.05% chromium, 1% nickel, and the balance is aluminum.

[0087] Comparative Example 4: This comparative example provides another additive preparation method to prepare additive D4, which is prepared in a manner similar to Example 1, except that the semi-solid 6013 aluminum alloy melt in step (1) is replaced with a liquid 6013 aluminum alloy melt at a temperature of 680°C.

[0088] 2. Performance testing part

[0089] Mechanical properties test: The mechanical properties of the additives of various embodiments and comparative examples at room temperature were tested with reference to standard GB / T 228.1-2010 “Tensile test of metallic materials Part 1: Room temperature test method”.

[0090] Table 1 Yield strength and tensile strength of the additives of various embodiments and comparative examples.

[0091]

[0092] It can be seen from the above results that the mechanical properties of the additives of Examples 1, 2, and 5 are better than those of Comparative Example 1. This is because when the shell cavity prepared by the above-mentioned wire material is filled with molten metal, heat exchange will occur between the molten metal and the inner wall of the shell, causing the latter's temperature to rise rapidly and gradually decrease after the filling is completed. Since the thermal expansion coefficients of the solid particles and the aluminum alloy are quite different, pores will be generated between the particles and the aluminum alloy during the heating and cooling process of the inner wall, and the liquid phase components of the molten metal can penetrate into the pores, thereby promoting the physical integration of the molten metal and the inner wall, thereby improving the interface bonding strength. According to Figure 2 The results (from top to bottom, the curves are respectively Example 1, Comparative Example 4, Comparative Example 3, Comparative Example 2 and Comparative Example 1) show that the additive of Example 1 has significantly improved mechanical properties relative to Comparative Example 1. The tensile curve of Comparative Example 1 drops rapidly after reaching the maximum stress, and brittle fracture occurs. This shows that the interface bonding strength between the shell and the material inside the cavity of the additive of Comparative Example 1 is poor and it is difficult to withstand large stress. Comparative Example 2 uses copper instead of SiC, and the thermal expansion coefficient is slightly different from that of the shell material. It is difficult to form pores during the casting and cooling process, and it is difficult to enhance the interface bonding effect. Comparative Example 3 uses two materials with larger differences in thermal expansion coefficients. It is also difficult to balance the thermal expansion coefficients of the two by adding solid particles to the shell material. Comparative Example 4 uses a mixture of liquid aluminum alloy melt and SiC. Due to the poor wettability of SiC and aluminum alloy and the large density difference, SiC is easily aggregated during the preparation of the wire, resulting in uneven distribution of SiC in the wire. However, Example 1 uses a semi-solid aluminum alloy melt. During the preparation of the wire, SiC particles are evenly distributed under the promotion of solid particles in the melt.

[0093] The technical features of the above-mentioned implementation modes and examples can be combined in any appropriate manner. To make the description concise, not all possible combinations of the technical features in the above-mentioned implementation modes and examples are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0094] The above-described embodiments only express several implementation methods of the present application, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for those of ordinary skill in the art, without departing from the concept of the present application, several variations and improvements can also be made, which all belong to the protection scope of the present application. In addition, it should be understood that after reading the above-mentioned teaching content of the present application, those skilled in the art can make various changes or modifications to the present application, and the equivalent forms obtained also fall within the protection scope of the present application. It should also be understood that the technical solutions obtained by those skilled in the art on the basis of the technical solutions provided in the present application through logical analysis, reasoning or limited experiments are all within the protection scope of the claims attached to the present application. Therefore, the protection scope of the patent of the present application shall be based on the attached claims, and the description can be used to interpret the content of the claims.

Claims

1. An additive manufacturing method based on aluminum alloy wire, characterized in that: The steps include: preparing a semi-solid aluminum alloy melt, stirring the semi-solid aluminum alloy melt, and adding solid particles during the stirring process to prepare an aluminum alloy wire; Using the aluminum alloy wire as a raw material, a three-dimensional model printing method is used to construct an additive material with a cavity; Filling the cavity with a molten metal, and after the filling is completed, heat treating the additive material; The solid phase fraction of the semi-solid aluminum alloy melt is 50% to 60%, and the thermal expansion coefficient is 23.4×10 -6 / ℃~24×10 -6 / ℃; The solid particles are SiC; the thermal expansion coefficient of the metal melt is 21.4×10 -6 / ℃~23.4×10 -6 / ℃.

2. The additive manufacturing method based on aluminum alloy wire according to claim 1, characterized in that: The mass fraction of the solid particles is 0.5% to 1.5%.

3. The additive manufacturing method based on aluminum alloy wire according to claim 1, characterized in that: The heat treatment includes T4 heat treatment or T6 heat treatment.

4. The additive manufacturing method based on aluminum alloy wire according to claim 1, characterized in that: The particle size of the solid particles is 10 μm to 200 μm.

5. The additive manufacturing method based on aluminum alloy wire according to claim 1, characterized in that: The semi-solid aluminum alloy melt includes a 6013 aluminum alloy melt.

6. The additive manufacturing method based on aluminum alloy wire according to claim 1, characterized in that: The metal melt includes A356.2 metal melt.

7. The additive manufacturing method based on aluminum alloy wire according to claim 1, characterized in that: The three-dimensional model printing includes using arc additive manufacturing technology to print the 3D model.

8. An additive material prepared by the additive manufacturing method based on aluminum alloy wire according to any one of claims 1 to 7.

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