A solid solution strengthening type Al-Mg2Si-Mg alloy material, a preparation method and application thereof

Abstract

The application discloses a solid solution strengthening type Al-Mg2Si-Mg alloy material and a preparation method and application thereof. The alloy material is prepared by blending Al-Mg2Si powder and Al-Mg powder with different particle sizes through an additive manufacturing process, and rapid forming of a high-strength and high-toughness alloy is realized. The alloy material fully utilizes the characteristics of the rapid cooling speed of the additive manufacturing to promote a large amount of Mg to be dissolved in the matrix to play a solid solution strengthening role, in addition, Mg and Mg2Si can improve the alloy growth restriction factor, greatly refine the grain size of the alloy material to form a crack-resistant system, without the need of introducing additional strengthening elements, while the mechanical properties of the alloy material are ensured. The alloy material provided by the application fully utilizes the advantages of the rapid solidification of the additive manufacturing, and simultaneously solves the problems of poor formability and low strength of the aluminum alloy, and can meet the mechanical requirements of aerospace parts.

Description

TECHNICAL FIELD

[0001] The application relates to a high-toughness aluminum alloy material, in particular to a solid solution strengthening type Al-Mg2Si-Mg alloy material and a preparation method and application thereof, and belongs to the technical field of new material preparation. BACKGROUND

[0002] Aluminum alloy is the most widely used metal structural material at present due to its excellent strength-weight ratio and good machinability, and is widely used in the manufacture of aerospace industrial structural parts. When a traditional subtractive manufacturing method is used, the geometric complexity of many aerospace parts may cause manufacturing challenges. However, the additive manufacturing process is suitable for application in this field due to the low volume, high value and geometric complexity of the parts to be manufactured. Laser powder bed fusion technology (LPBF) has become one of the most widely used AM technologies and has developed from a rapid prototyping technology to a mature industrial reality. LPBF has been applied to the production of various engineering alloys such as steel, titanium, nickel and aluminum alloy. The production-related problems of aluminum alloy such as high reflectivity, high thermal conductivity, strong oxidation tendency and wide solidification range often lead to defects such as cracks and shrinkage holes in the sample production cycle, so that the types of commercial aluminum alloys are relatively limited.

[0003] At present, the main alloys that can be stably printed into shapes are cast Al-Si alloys with near-eutectic composition, good fluidity and low thermal tear sensitivity. However, the strength of the alloy is mostly only 400-500 MPa, which cannot meet the demand of industry for high-toughness aluminum alloy. In contrast, some precipitation hardening alloys (such as 2xxx and 7xxx) can provide higher strengthening potential, but often have a large liquidus-solidus temperature range and high cracking sensitivity, resulting in poor forming performance. In addition, non-heat-treated wrought alloys (such as 1xxx, 3xxx and 5xxx) mainly achieve high strength through solid solution hardening and cold working. However, it is usually impossible to perform cold working in LPBF, and these alloys can also easily crack during printing. These precipitation hardening alloys and non-heat-treated wrought alloys need to add noble metals such as Sc and Zr or ceramic particles such as TiB2 and SiC to improve their formability in order to achieve high toughness. This will greatly increase the preparation cost, complicate the industrial process, and is not suitable for large-scale industrial production. SUMMARY

[0004] In view of the problems in the prior art, a first object of the present application is to provide a solid solution strengthened Al-Mg2Si-Mg alloy material, which is prepared by mixing Al-Mg2Si powder and Al-Mg powder, and based on the solid solution strengthening effect of Mg element and the effect of Mg and Mg2Si on improving the growth restriction factor of the alloy, the grain size of the alloy material is greatly refined to form a crack-resistant system, so that the forming property of the material is realized while the mechanical properties of the alloy material are ensured.

[0005] A second object of the present application is to provide a preparation method of the solid solution strengthened Al-Mg2Si-Mg alloy material, which uses Al-Mg2Si powder and Al-Mg powder with different particle sizes, and based on the synergistic effect of the components in the raw materials, the characteristics of rapid solidification of additive manufacturing are fully utilized, and the forming property and mechanical property of the material are further controlled by adjusting the process parameters, so that the rapid forming of high strength and toughness alloy is realized.

[0006] A third object of the present application is to provide an application of the solid solution strengthened Al-Mg2Si-Mg alloy material, which is used for preparing aerospace complex parts. The alloy material provided by the present application is based on the solid solution strengthening of Mg element and the fine-grain strengthening of Mg and Mg2Si, and without additional addition of noble metal elements and other strengthening elements, the high density and strength and toughness of the alloy can be realized. According to tests, the relative density of the alloy material provided by the present application is 99.9%, the forming property is good, the maximum tensile strength is 540 MPa, the yield strength is 396 MPa, and the elongation is 10.8%, which meets the requirements of aerospace complex parts.

[0007] To achieve the above technical objects, the present application provides a preparation method of a solid solution strengthened Al-Mg2Si-Mg alloy material, which comprises the following steps: uniformly mixing raw materials including Al-Mg2Si alloy powder and Al-Mg powder, and then 3D printing to obtain the Al-Mg2Si-Mg alloy material; the particle size of the Al-Mg2Si alloy powder is 20-60 μm, the particle size of the Al-Mg powder is 10-40 μm, the mass ratio of the Al-Mg powder to the Al-Mg2Si alloy powder is 1:1-50, and the characteristic structure of the Al-Mg2Si-Mg alloy material comprises fine equiaxed cellular structure composed of Mg2Si and Mg.

[0008] The preparation method provided by the present application uses Al-Mg2Si powder and Al-Mg powder with different particle sizes, based on the synergistic effect of the components in the raw materials, the characteristics of rapid solidification of additive manufacturing are fully utilized, and the forming property and mechanical property of the material are further controlled by adjusting the process parameters, so that the rapid forming of high strength and toughness alloy is realized.

[0009] The particle size of the raw materials used in the present application must be strictly in accordance with the above requirements. If the particle size of the Al-Mg2Si powder and the Al-Mg powder is too large, it is easy to cause adhesion and agglomeration, which can lead to high surface roughness of the metal sample obtained by printing, and reduce the formability.

[0010] The ratio between the raw materials used in the present application must be strictly in accordance with the above requirements. If the addition ratio of Al-Mg is too small, it can lead to a decrease in the solid solution Mg element in the alloy, greatly reducing the effect of solid solution strengthening. In addition, the effect of grain refinement is also reduced, resulting in lower mechanical properties. When the addition ratio of Al-Mg is too large, it can lead to an increase in the crack sensitivity of the alloy, reducing the formability of the alloy.

[0011] As a preferred scheme, the mass percentage composition of the Al-Mg2Si alloy powder is: 6-12% Mg2Si, and the balance is Al.

[0012] As a preferred scheme, the mass percentage composition of the Al-Mg alloy powder is: 5-15% Mg, and the balance is Al.

[0013] As a preferred scheme, the purity of the Al-Mg2Si alloy powder and the Al-Mg powder is ≥99.9%.

[0014] As a preferred scheme, the raw materials of the Al-Mg2Si-Mg alloy material further include Ca.

[0015] As a preferred scheme, the content of Ca is 0.5-1% of the total mass percentage of the alloy material. Ca element can be introduced by Ca element or Al2Ca. The presence of Ca element can greatly reduce the volatilization of Mg during printing, further reducing the production cost.

[0016] As a preferred scheme, the particle size of the Al-Mg2Si alloy powder is greater than or equal to the particle size of the Al-Mg powder.

[0017] As a preferred scheme, the mass ratio of the Al-Mg powder to the Al-Mg2Si alloy powder is 1:5-20. When the content of Mg2Si in the Al-Mg2Si alloy powder is 7-10%, and the content of Mg in the Al-Mg alloy powder is 8-12%, the main process parameters for 3D printing forming are: main laser power 270-310 W, scanning speed 600-1000 mm / s; scanning interval 0.11-0.15 mm, powder laying thickness 0.03-0.05 mm, scanning area width 8-12 mm, and substrate temperature 90-110°C.

[0018] As a preferred scheme, the mass ratio of the Al-Mg powder to the Al-Mg2Si alloy powder is 1:8, the Mg2Si content in the Al-Mg2Si alloy powder is 8%, and the Mg content in the Al-Mg alloy powder is 10%, and the main process parameters of 3D printing forming are as follows: the main laser power is 290 W, the scanning speed is 800 mm / s, the scanning interval is 0.12 mm, the powder laying thickness is 0.04 mm, the scanning area width is 10 mm, and the substrate temperature is 100 DEG C.

[0019] Within the mass ratio range of Al-Mg to Al-Mg2Si provided in the application, with the increase of the Mg content, the grain refinement effect of the alloy is better, and the alloy is more resistant to cracking, so that the laser power is lower, the scanning speed is larger, and the scanning interval is larger, so that the laser energy density is low, and the formability is better; with the increase of the Mg2Si content in Al-Mg2Si, the required laser energy density is high, so that the laser power is larger, the scanning speed is smaller, and the scanning interval is smaller, and the formability is better, so that the process parameters of different Al-Mg and Mg2Si contents should be strictly selected according to the requirements of the application.

[0020] The application further provides a solid solution strengthening type Al-Mg2Si-Mg alloy material prepared by the preparation method.

[0021] As a preferred scheme, the Mg element in the alloy material enters the alpha-Al matrix and the cellular structure in the form of solid solution. The fine equiaxed cellular structure composed of Mg2Si and Mg can play a grain refinement strengthening role. Most of the Mg elements exist in the form of solid solution, and play a solid solution strengthening role. The organizational structure characteristics of the above-mentioned alloy material are realized by using the rapid solidification characteristics of additive manufacturing.

[0022] As a preferred scheme, the growth restriction factor of the alloy material is 24-49K.

[0023] The hot cracks can be eliminated by refining the grains, and then forming a crack-resistant system. Currently, the 2-7 series alloy printing usually uses a large amount of Sc, Zr and ceramic particles and other heterogeneous nucleation to refine the grains, which has a high cost. The application ingeniously realizes grain refinement through the synergistic effect of Mg and Mg2Si. The higher growth restriction factor indicates that the grain refinement effect is better, and the formability is better. The growth restriction factor of the Al-Mg2Si-Mg in the application is 24-49K, which has a large growth restriction factor, ensures the excellent forming performance of the alloy material, and the obtained alloy material has no cracks and high relative density.

[0024] The growth restriction factor of the alloy material provided in the application is strictly executed according to the above requirements. When the growth restriction factor is too low, the grain refinement effect is not obvious, cracks are easy to produce, and the forming performance is poor.

[0025] The application also provides an application of the solid solution strengthening type Al-Mg2Si-Mg alloy material to preparation of integral aerospace parts.

[0026] The alloy material provided by the application takes full advantage of the characteristics of rapid solidification of additive manufacturing, controls forming through a growth restriction factor, and realizes the combination of good formability and mechanical properties through solid solution strengthening of a large amount of Mg and adjustment of process parameters, so that the goal of formability synergy is achieved; the alloy material can realize production of complex parts and meet the mechanical requirements of lightweight materials in aerospace and high-speed rail.

[0027] Compared with the prior art, the application has the beneficial technical effects that:

[0028] 1) The alloy material provided by the application mixes Al-Mg powder and Al-Mg2Si, is based on solid solution strengthening of Mg elements, and can improve the growth restriction factor of the alloy and greatly refine the grain size of the alloy material to form a crack-resistant system, so that good formability is realized while the mechanical properties of the alloy material are ensured.

[0029] 2) In the technical solution provided by the application, Al-Mg2Si powder and Al-Mg powder with different particle sizes are used, the characteristics of rapid solidification of additive manufacturing are fully utilized based on the synergistic effect of components between raw materials, and the formability and mechanical properties of the material are further controlled through adjustment of process parameters, so that rapid forming of a high-strength and high-toughness alloy is realized.

[0030] 3) The alloy material provided by the application is based on solid solution strengthening of Mg elements and fine-grain strengthening of Mg and Mg2Si, and can realize high density and high strength and toughness of the alloy without additional addition of noble metal elements and strengthening elements; according to tests, the relative density of the alloy material provided by the application is 99.9%, the formability is good, the maximum tensile strength is 540 MPa, the yield strength is 396 MPa, and the elongation is 10.8%, which meets the requirements of complex parts in aerospace. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 A microstructure diagram of the Al-Mg2Si-Mg alloy powder described in Example 3;

[0032] Figure 2 A metallographic diagram of the Al-Mg2Si-Mg described in Example 3 and Comparative Examples 1, 2 and 3;

[0033] Figure 3 A TEM diagram of the Al-Mg2Si-Mg described in Example 3;

[0034] Figure 4 is a complex aerospace part prepared in Example 3;

[0035] From Figure 1 it can be seen that the morphology of the mixed Al-Mg powder and Al-Mg2Si-Mg powder;

[0036] From Figure 2 it can be seen that (a) is the metallographic image of the printed aluminum alloy without adding Al-Mg powder, a large number of pores, pores and other defects exist; (b) is the metallographic image of the printed aluminum alloy with the addition of the optimal Al-Mg and Al-Mg2Si powder mixture and the optimal process parameter, the results show that there is no crack, pore, and the relative density is high; (c) is the metallographic image of the printed Al-Mg2Si-Mg without using the optimal process parameter, there is a certain amount of pores; (d) is the metallographic image of the printed aluminum alloy with the addition of excessive Al-Mg powder, a large number of pores and cracks exist;

[0037] From Figure 3 it can be seen that the cellular structure has a large amount of Mg solid solution in the matrix and cellular structure; from Figure 4 it can be seen that the optimal addition of Al-Mg and Al-Mg2Si powder and the optimal printing process parameter can be used to prepare a complex part with good formability, no crack, and excellent mechanical properties. DETAILED DESCRIPTION

[0038] The present application will be described in detail below in conjunction with the drawings and specific embodiments, which cannot be considered as limiting the specific implementation of the present application to these descriptions. For ordinary skilled in the art to which the present application belongs, without departing from the concept of the present application, a number of simple deductions or substitutions can also be made, which should be considered as belonging to the protection scope of the present application.

[0039] Example 1

[0040] The Al-Mg2Si-Mg alloy part prepared by LPBF forming is composed of 4% Mg2Si, 2.5% Mg, 0.7% Ca, and the balance of Al. The powder is composed of coarse powder Al-Mg2Si with an average particle size of 20-60 μm and fine powder Al-Mg with an average particle size of 10-40 μm, and the alloy growth restriction factor is 29K. The main parameters of the 3D printing forming process are: laser power 290W, scanning speed 800mm / s; scanning interval 0.12mm, powder laying thickness 0.04mm, scanning area width 10mm, and substrate temperature 100℃.

[0041] The printed is a special complex part for aerospace, the relative density of the Al alloy shown is 99.4%, the maximum tensile strength is 513MPa, the yield strength is 345MPa, and the elongation is 7.2%.

[0042] Example 2

[0043] Al-Mg2Si-Mg alloy parts were made by LPBF forming. The Al alloy composition consists of 6% Mg2Si, 2.5% Mg, 0.7% Al2Ca, and the balance Al. The powder consists of coarse Al-Mg2Si powder with an average particle size of 30-60 pm and fine Al-Mg powder with an average particle size of 10-25 pm, and the alloy growth restriction factor is 39 K. The main parameters of the 3D printing forming process are: laser power 290 W, scanning speed 800 mm / s; scanning interval 0.12 mm, powder laying thickness 0.04 mm, scanning area width 10 mm, and substrate temperature 100 °C.

[0044] The printed parts are complex parts for aerospace, and the relative density of the Al alloy is 99.7%, the maximum tensile strength is 520 MPa, the yield strength is 356 MPa, and the elongation is 9.6%.

[0045] Example 3

[0046] Al-Mg2Si-Mg alloy parts were made by LPBF forming. The Al alloy composition consists of 6% Mg2Si, 2.5% Mg, 0.7% Al2Ca, and the balance Al. The powder consists of coarse Al-Mg2Si powder with an average particle size of 30-60 pm and fine Al-Mg powder with an average particle size of 10-25 pm, and the alloy growth restriction factor is 39 K. The main parameters of the 3D printing forming process are: laser power 290 W, scanning speed 800 mm / s; scanning interval 0.12 mm, powder laying thickness 0.04 mm, scanning area width 10 mm, and substrate temperature 100 °C.

[0047] The printed parts are complex parts for aerospace, and the relative density of the Al alloy is 99.9%, the maximum tensile strength is 540 MPa, the yield strength is 396 MPa, and the elongation is 10.8%.

[0048] Example 4

[0049] Al-Mg2Si-Mg alloy parts were made by LPBF forming. The Al alloy composition consists of 6% Mg2Si, 2.5% Mg, 0.7% Al2Ca, and the balance Al. The powder consists of coarse Al-Mg2Si powder with an average particle size of 30-60 pm and fine Al-Mg powder with an average particle size of 10-25 pm, and the alloy growth restriction factor is 39 K. The main parameters of the 3D printing forming process are: laser power 290 W, scanning speed 800 mm / s; scanning interval 0.12 mm, powder laying thickness 0.04 mm, scanning area width 10 mm, and substrate temperature 100 °C.

[0050] The printed aerospace special complex parts, the relative density of the Al alloy shown is 99.6%, the maximum tensile strength is 532 MPa, the yield strength is 384 MPa, and the elongation is 8.2%.

[0051] Comparative Example 1

[0052] The Al-Mg2Si-Mg alloy parts prepared by LPBF forming are composed of 6% Mg2Si, 4% Mg, 0.7% Ca, and the balance of Al. The powder is composed of coarse powder Al-Mg2Si with an average particle size of 30-60 μm and fine powder Al-Mg with an average particle size of 10-25 μm, and the alloy growth restriction factor is 67K. The main parameters of the 3D printing forming process are: laser power 310W, scanning speed 1000mm / s; scanning interval 0.15mm, powder laying thickness 0.06mm, scanning area width 8mm, substrate temperature 80℃.

[0053] The printed aerospace special complex parts, the relative density of the Al alloy shown is 99.1%, the maximum tensile strength is 501 MPa, the yield strength is 351 MPa, and the elongation is 6.3%.

[0054] Comparative Example 2

[0055] The Al-Mg2Si-Mg alloy parts prepared by LPBF forming are composed of 6% Mg2Si, 10% Mg, 0.7% Ca, and the balance of Al. The powder is composed of coarse powder Al-Mg2Si with an average particle size of 30-60 μm and fine powder Al-Mg with an average particle size of 10-25 μm, and the alloy growth restriction factor is 45K. The main parameters of the 3D printing forming process are: laser power 290W, scanning speed 800mm / s; scanning interval 0.12mm, powder laying thickness 0.05mm, scanning area width 12mm, substrate temperature 90℃.

[0056] The printed aerospace special complex parts, the relative density of the Al alloy shown is 98.1%, the maximum tensile strength is 280 MPa, the yield strength is 202 MPa, and the elongation is 1.8%.

[0057] Comparative Example 3

[0058] An Al-Mg2Si-Mg alloy part was formed by LPBF. The Al alloy composition was 6% Mg2Si, 0% Mg, 0.7% Al2Ca, and the balance Al. The powder was composed of coarse powder Al-Mg2Si with an average particle size of 30-60 pm and fine powder Al-Mg with an average particle size of 10-25 pm, and the alloy growth restriction factor was 24 K. The main parameters of the 3D printing forming process were as follows: laser power 290 W, scanning speed 800 mm / s; scanning interval 0.12 mm, powder laying thickness 0.04 mm, scanning area width 10 mm, and substrate temperature 100 °C.

[0059] The printed aerospace special complex part had an Al alloy with a relative density of 98.8%, a maximum tensile strength of 351 MPa, a yield strength of 282 MPa, and an elongation of 4.3%.

[0060] Comparative Example 4

[0061] An Al-Mg2Si-Mg alloy part was formed by LPBF. The Al alloy composition was 6% Mg2Si, 0% Mg, 0.7% Al2Ca, and the balance Al. The powder was composed of coarse powder Al-Mg2Si with an average particle size of 30-60 pm and fine powder Al-Mg with an average particle size of 10-25 pm, and the alloy growth restriction factor was 24 K. The main parameters of the 3D printing forming process were as follows: laser power 290 W, scanning speed 800 mm / s; scanning interval 0.12 mm, powder laying thickness 0.04 mm, scanning area width 10 mm, and substrate temperature 100 °C.

[0062] The printed aerospace special complex part had an Al alloy with a relative density of 98.8%, a maximum tensile strength of 351 MPa, a yield strength of 282 MPa, and an elongation of 4.3%.

[0063] Comparative Example 5

[0064] An Al-Mg2Si-Si alloy material was formed by SLM. The Al alloy composition was 9% Mg2Si, 1.3% Si, and the balance Al. The powder was composed of coarse powder Al-Mg2Si with an average particle size of 30-60 pm and fine powder Si with an average particle size of 10-25 pm. The alloy solidification interval was 25 °C, and the thermal sensitivity factor was 0.19 x 10 490°C. The Al-Mg2Si-Si alloy powder is spread on the substrate, printing forming is carried out according to the three-dimensional model, and a complex part is obtained; wherein the laser parameters include: main laser power 330 W, scanning speed 650 mm / s; upper surface and lower surface filling laser power 260 W, scanning speed 1100 mm / s; filling contour laser power 250 W, scanning speed 200 mm / s; outer wall scanning laser 260 W, scanning speed 250 mm / s; scanning interval 0.12 mm, powder spreading thickness 0.02 mm, scanning area width 6 mm, and substrate temperature 90°C;

[0065] The printed complex part is a turbine blade, the relative density of the Al alloy is 99.8%, there is no crack, the maximum tensile strength is 484.3 MPa, the yield strength is 386.1 MPa, and the elongation is 7.85%.

[0066] Table 1 is a performance table of the samples obtained in the examples and the comparative examples

[0067]

[0068]

[0069] The test results shown in Table 1 show that, by mixing Al-Mg and Al-Mg2Si powders, the growth restriction factor of the aluminum alloy can be improved, the formability is improved, high relative density and no cracks are achieved, and at the same time, a large amount of Mg is solid-solved to make the mechanical properties of the as-printed sample excellent, but it is necessary to strictly control the addition amount of Al-Mg and Al-Mg2Si and the addition of a small amount of Al2Ca or Ca; at the same time, the laser powder bed fusion printing parameters are preferably selected; the two are combined to make the aluminum alloy have high strength and elongation.

[0070] The Al-Mg2Si-Mg alloy material of the present application and the Al-Mg2Si-Si alloy material shown in Comparative Example 5 mainly differ in that: (1) the principles of alloy design are different, the Al-Mg2Si-Si alloy material in Comparative Example 5 mainly improves the fluidity of the alloy in the molten state by adding Si powder, greatly reduces the solidification interval and the thermal sensitivity factor of the alloy material, thereby ensuring the formability of the alloy; while the Al-Mg2Si-Mg of the present application mainly uses Mg element to improve the alloy growth restriction factor to refine the grains, thereby achieving the effect of no crack; (2) the strengthening mechanisms are different, the alloy material in Comparative Example 5 mainly uses the coherent effect between the main strengthening phase Al-Mg2Si and the matrix and the auxiliary strengthening phase Si precipitation to improve the mechanical properties of the alloy; while the alloy material of the present application is based on the solid solution strengthening of Mg in α-Al and the cellular structure caused by the rapid solidification of additive manufacturing and the grain refinement to realize high strength and toughness aluminum alloy; (3) the performance of the alloy material obtained by the present application is better than that of the alloy material of Comparative Example 5.

Claims

1. A method for preparing a solid solution-strengthened Al-Mg2Si-Mg alloy material, characterized in that: The raw materials, including Al-Mg2Si alloy powder and Al-Mg powder, are mixed evenly and then 3D printed to obtain the product; the particle size of the Al-Mg2Si alloy powder is 20~60μm and the particle size of the Al-Mg powder is 10~40μm. The characteristic microstructure of the Al-Mg2Si-Mg alloy material includes a fine equiaxed cellular structure composed of Mg2Si and Mg. The Al-Mg2Si alloy powder has the following mass percentage composition: 6~12% Mg2Si, with the balance being Al; the Al-Mg alloy powder has the following mass percentage composition: 5~15% Mg, with the balance being Al. The mass ratio of Al-Mg powder to Al-Mg2Si alloy powder is 1:5~20. When the Mg2Si content in the Al-Mg2Si alloy powder is 7~10% and the Mg content in the Al-Mg alloy powder is 8~12%, the main process parameters for 3D printing are: main laser power 270~310W, scanning speed 600~1000mm / s; scanning spacing 0.11~0.15mm, powder thickness 0.03~0.05mm, scanning area width 8~12mm, and substrate temperature 90~110℃.

2. The method for preparing a solid solution-strengthened Al-Mg2Si-Mg alloy material according to claim 1, characterized in that: The purity of the Al-Mg2Si alloy powder and Al-Mg powder is ≥99.9%.

3. The method for preparing a solid solution-strengthened Al-Mg2Si-Mg alloy material according to claim 1, characterized in that: The raw materials for the Al-Mg2Si-Mg alloy also include Ca; the content of Ca is 0.5~1% of the total mass of the alloy material.

4. The method for preparing a solid solution-strengthened Al-Mg2Si-Mg alloy material according to claim 1, characterized in that: The particle size of the Al-Mg2Si alloy powder is greater than or equal to the particle size of the Al-Mg powder.

5. The method for preparing a solid solution-strengthened Al-Mg2Si-Mg alloy material according to claim 1, characterized in that: The mass ratio of Al-Mg powder to Al-Mg2Si alloy powder is 1:

8. When the Mg2Si content in the Al-Mg2Si alloy powder is 8% and the Mg content in the Al-Mg alloy powder is 10%, the main process parameters for 3D printing are: main laser power 290W, scanning speed 800mm / s, scanning spacing 0.12mm, powder thickness 0.04mm, scanning area width 10mm, and substrate temperature 100℃.

6. A solid solution-strengthened Al-Mg2Si-Mg alloy material, characterized in that: It is prepared by the preparation method according to any one of claims 1 to 5.

7. The solid solution strengthened Al-Mg2Si-Mg alloy material according to claim 6, characterized in that: The Mg element in the alloy material enters the α-Al matrix and cellular structure in a solid solution form.

8. The solid solution strengthened Al-Mg2Si-Mg alloy material according to claim 6, characterized in that: The growth limiting factor of the alloy material is 24~49K.

9. The application of the solid solution strengthened Al-Mg2Si-Mg alloy material according to any one of claims 6 to 8, characterized in that: Used to manufacture integrated aerospace components.

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