Alloy phase and ceramic phase multiphase synergistically strengthened aluminum alloy for additive manufacturing and preparation method and application of alloy phase and ceramic phase multiphase synergistically strengthened aluminum alloy

Abstract

The invention discloses an alloy phase and ceramic phase multiphase synergistically strengthened aluminum alloy for additive manufacturing and a preparation method and application thereof, and belongs to the field of additive manufacturing aluminum alloys, powder is prepared through three-dimensional mixing or gas atomization and other modes, and obtained original alloy powder is simple in component, free of precious metal elements and low in cost; the method is suitable for industrial production. Controllable preparation of the high-strength aluminum alloy material is achieved through the additive manufacturing technology, and the aluminum alloy for additive manufacturing has the advantages of being wide in machining window, free of element volatilization, high in printing state strength and plasticity, high in yield and tensile strength after further heat treatment and the like; and the components adopted by the invention expand an existing additive manufacturing aluminum alloy component system.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of additive manufacturing of aluminum alloys, and particularly relates to an additive manufacturing aluminum alloy with alloy phase and ceramic phase multiphase synergistic strengthening and a preparation method and application thereof. BACKGROUND

[0002] Additive manufacturing (AM) is a technology for realizing integrated forming of complex structures through layer-by-layer accumulation, which has the following advantages: high design freedom, high material utilization, no need for mold development, and short delivery cycle. Aluminum alloys are widely studied in the field of additive manufacturing due to their lightweight (density 2.63-2.85 g / cm 3 ) and good thermal / electrical conductivity, etc. Additive manufacturing technology provides a revolutionary solution for lightweight design of aluminum alloy complex components. However, when applying high-strength aluminum alloy powder in the traditional casting and forging field to the 3D printing field, there are defects such as element volatilization and hot cracking, which limit its application in the 3D printing field, and the strength is difficult to meet the needs of key structural parts in the fields of aerospace and new energy vehicles. Although the performance can be improved by adding micro-alloying elements such as Sc / Zr, the high cost of the scarce metal Sc restricts the engineering application. In addition, single ceramic reinforcement phase (such as SiC, TiB2) is prone to particle segregation and interface reaction to generate brittle Al4C3 phase due to mismatch of melt pool dynamics during AM, which damages the material density and mechanical properties.

[0003] Therefore, developing a multiphase and multiscale reinforced aluminum alloy composite material with high plasticity in the printing state, high yield strength and high tensile strength after heat treatment, good formability, and low cost suitable for additive manufacturing process has become the key to breaking through the technical bottleneck of the industry. SUMMARY

[0004] To solve the problems of the strength of the additive manufacturing aluminum alloy being unable to adapt to the rapid development of industrial demand and the high cost of the reinforcing phase (such as Sc, Zr, Ce) in engineering application, the application provides an additive manufacturing aluminum alloy with alloy phase and ceramic phase multiphase synergistic strengthening and a preparation method and application thereof, which is suitable for the field of high-strength and high-structural-complexity aluminum alloys such as aerospace and vehicle frames.

[0005] One of the technical solutions provided by the application is:

[0006] A preparation method of an additive manufacturing aluminum alloy with alloy phase and ceramic phase multiphase synergistic strengthening, comprising the following steps: adding vanadium elements, titanium elements and carbon elements, or vanadium, titanium carbon compounds to aluminum alloy or pure aluminum powder to prepare original alloy powder; 3D printing is performed with the original alloy powder as raw material to obtain a printing state aluminum alloy, and the additive manufacturing aluminum alloy is prepared and is denoted as a printing state aluminum alloy.

[0007] In the present application, vanadium element (V), titanium element (Ti) and carbon (C) element, or carbon compounds of vanadium and titanium, are added to aluminum alloy or pure aluminum powder to prepare raw alloy powder. The raw alloy powder is used as raw material for laser printing. In the process of laser printing, (Ti, V)C ceramic phase and Al3(Ti, V) alloy phase are generated in situ, both of which can act as heterogeneous nucleation sites to refine the size of aluminum grains. At the same time, the ceramic phase has a small particle size, and the alloy phase has a large size, but both are smaller than microns. The multi-phase and multi-size synergistic strengthening significantly improves the performance of aluminum-based materials. In addition, both the ceramic phase and the alloy phase have a low lattice mismatch with the aluminum matrix, and the interface has good coherency. During plastic deformation, the interface stress concentration is reduced, thereby improving the plasticity of the composite material.

[0008] The obtained mixed powder is sieved through a 250 mesh screen to separate the powder with a particle size of <250 μm. The powder is dried in a vacuum oven (100℃, 2h) to obtain the raw alloy powder; or the raw alloy powder is prepared by melting and gas atomization.

[0009] Further, the content of V element in the raw alloy powder is 1.2-2.5wt.%; the content of C element is 0.29-0.6wt.%; and the content of Ti element is 1.0-2.0wt.%, according to the mass percentage of the elements.

[0010] Further, the aluminum alloy is selected from 1000 series, 2000 series, 3000 series, 4000 series, 5000 series, 6000 series, 7000 series, 8000 series or 9000 series aluminum alloy.

[0011] Further, the 3D printing is selective laser melting printing.

[0012] Further, the parameters of the selective laser melting printing include: laser power is 220-340 W, laser scanning speed is 600-1200 mm / s, scanning line spacing is 80-120 μm, powder layer thickness is 30-40 μm, powder feeding ratio is 1.8-3.4, and laser layer rotation angle is 67°.

[0013] Further, the preparation method of the additive manufacturing aluminum alloy further comprises solid solution heat treatment of the printed aluminum alloy to obtain a solid solution state aluminum alloy.

[0014] Further, the specific operation of the heat treatment comprises the following steps: heating to 480℃-530℃, solid solution heat treatment for 0.5h-1h, and water cooling to room temperature.

[0015] Further, the preparation method of the additive manufacturing aluminum alloy further comprises a solid solution + aging heat treatment, so as to obtain an aluminum alloy in a T6 state.

[0016] Further, the solid solution + aging heat treatment comprises the following steps: heating to 480-530 DEG C, solid solution heat treatment for 0.5-1 h, water cooling to room temperature; heating to 120-150 DEG C, holding for 0.5-24 h, air cooling to room temperature.

[0017] The second technical solution provided by the application is as follows:

[0018] An additive manufacturing aluminum alloy prepared by the above preparation method is provided.

[0019] The third technical solution provided by the application is as follows:

[0020] The additive manufacturing aluminum alloy is applied to preparation of aerospace and vehicle frame structures.

[0021] Compared with the prior art, the application has the following advantages and technical effects:

[0022] The raw alloy powder obtained by three-dimensional mixing or gas atomization has simple composition, does not contain noble metal elements, and is low in cost, so that the additive manufacturing aluminum alloy is suitable for industrial production.

[0023] The additive manufacturing technology is used to realize controllable preparation of the aluminum alloy material with high plasticity in a printing state and high yield and high tensile strength after heat treatment, the additive manufacturing aluminum alloy has the advantages of wide processing window, no element volatilization and high forming degree, and the composition used in the application expands the existing additive manufacturing aluminum alloy composition system.

[0024] The additive manufacturing aluminum alloy has abundant reserves of alloy composition raw materials, simple additive manufacturing preparation process, convenient operation and short time consumption. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only show some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 The room temperature printing state stress-strain curves of the printing state aluminum alloys prepared for example 2, example 4, example 6, example 8, example 10 and comparative example 2 and the printing state aluminum alloy prepared for comparative example 1 are shown in the following table.

[0027] Figure 2 Room temperature solution treated stress-strain curves for the solution treated aluminum alloys prepared for Example 1, Example 3, Example 5, Example 7, and Example 9;

[0028] Figure 3 Room temperature as-printed stress-strain curves for the as-printed aluminum alloys prepared for Example 12 and Example 14;

[0029] Figure 4 Room temperature solution + aging treated stress-strain curves for the T6 aluminum alloys prepared for Example 11 and Example 13;

[0030] Figure 5 Room temperature as-printed stress-strain curves for the as-printed aluminum alloys prepared for Example 15-17;

[0031] Figure 6 Room temperature as-printed stress-strain curves for the as-printed aluminum alloys prepared for Example 18-19;

[0032] Figure 7 TEM image of the as-printed aluminum alloy prepared for Example 1;

[0033] Figure 8 EDS area scan elemental map under TEM of the as-printed aluminum alloy prepared for Example 1. DETAILED DESCRIPTION

[0034] Various example embodiments of the present application will now be described in detail with reference to certain figures and certain example embodiments, it being understood that the details described are to be considered in a descriptive sense only and are not for purposes of limiting the application.

[0035] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. In addition, where particular ranges of values are given, it is to be understood that each intervening value, to the upper or lower limit of the ranges is also specifically disclosed. Each smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in that stated range is encompassed. The upper and lower limits of these smaller ranges can independently be included or excluded in the range, and are also encompassed within the application, subject to any specifically excluded limit in the stated range. Where the stated range includes one or both of the limits, ranges excluding either or both of those included limits are also included.

[0036] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Although preferred methods and materials are described, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present application. All documents mentioned herein are incorporated by reference to disclose and describe the methods and / or materials in connection with which the documents are cited. In case of conflict, the content of the present specification will control.

[0037] Many modifications and variations of the specific embodiments of the application can be made without departing from the scope or spirit of the application, which will be apparent to those skilled in the art. Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application. The specification and examples are illustrative only.

[0038] As used herein, the terms "comprise", "comprising", "include", "including", "have" and "having" and the like are open-ended, that is, they mean "including but not limited to".

[0039] Room temperature of the present application refers to 25±2℃.

[0040] The embodiments of the present application add vanadium carbide and titanium in 2024 aluminum alloy or 7075 aluminum alloy; or add titanium carbide and vanadium; or add titanium powder, vanadium powder and carbon powder; carbon, vanadium and titanium elements into the aluminum alloy to prepare a series of in-situ synthesized alloy phase Al3(Ti, V) and ceramic phase (Ti, V)C multiphase reinforced aluminum alloy, which proves that under the premise of not being limited to the adding method, the synergistic addition of carbon, vanadium and titanium elements can generally improve the comprehensive performance of the aluminum alloy.

[0041] Comparative Example 1

[0042] Take 500g of 2024 aluminum alloy powder, sieve the particle size with a 250 mesh screen, and place the <250 mesh powder in a vacuum oven at 100℃ for 2h. Use a laser powder bed fusion 3D printer for additive manufacturing, laser power 250W, laser scanning speed 800mm / s, scanning line spacing 100μm, powder layer thickness 30μm, laser layer rotation angle 67°, powder feeding ratio 3.2, to obtain the printed aluminum alloy.

[0043] Comparative Example 2

[0044] Take 20g of titanium carbide powder and 480g of 2024 aluminum alloy powder, place them in a 5L stainless steel tank, and use a three-dimensional mixer to mix and disperse for 18h with a ball-to-powder ratio of 1:1. Take out the original alloy powder after three-dimensional mixing and dispersion, sieve the particle size with a 250 mesh screen, and place the <250 mesh powder in a vacuum oven at 100℃ for 2h. Use a laser powder bed fusion 3D printer for additive manufacturing, laser power 250W, laser scanning speed 800mm / s, scanning line spacing 100μm, powder layer thickness 30μm, laser layer rotation angle 67°, powder feeding ratio 3.2, to obtain the printed aluminum alloy.

[0045] Example 1

[0046] Take 7.5 g of vanadium carbide powder, 10 g of titanium powder and 482.5 g of 2024 aluminum alloy powder, put them in a 5L stainless steel tank, use a three-dimensional mixer to mix and disperse for 18h, the ball-to-material ratio is 1:1, take out the original alloy powder after three-dimensional mixing and dispersion (the theoretical calculation shows that the content of carbon element in the original alloy powder is 0.29wt.%, the content of vanadium element is 1.20wt.%, and the content of titanium element is 2.00wt.%), sieve the particle size with a 250 mesh sieve, and dry the <250 mesh powder in a vacuum oven at 100℃ for 2h. Additive manufacturing is carried out using a laser powder bed fusion 3D printer, the laser power is 220W, the laser scanning speed is 800mm / s, the scanning line spacing is 100μm, the powder layer thickness is 30μm, the laser layer rotation angle is 67°, and the powder feeding ratio is 2.8, to obtain a printed aluminum alloy; the printed aluminum alloy is subjected to solid solution heat treatment, and the parameters are: solid solution temperature is 520℃, holding time is 1h, water cooling to room temperature, to obtain a solid solution aluminum alloy.

[0047] Figure 7 TEM image of the printed aluminum alloy prepared in Example 1; by Figure 7 It can be seen that the alloy phase size is large (>100nm), the ceramic phase size is small (less than 50nm), and is distributed in the grain and the grain boundary, the intragranular particle phase refines the grain as a heterogeneous nucleation site, and the particle phase at the grain boundary effectively pins the grain boundary, slowing down the grain boundary movement.

[0048] Figure 8 EDS surface scanning element distribution map of the printed aluminum alloy prepared in Example 1 under TEM;

[0049] By Figure 8 It can be seen that Cu and Mg elements are distributed at the grain boundary to form a eutectic network, larger size V elements have a corresponding relationship with Ti elements, which are Al3(Ti, V) alloy phases; smaller size V elements, Ti elements and carbon elements have a corresponding relationship, which are (Ti, V)C ceramic phases, and the two phases synergistically strengthen the aluminum-based material.

[0050] Example 2

[0051] The same as Example 1, except that no solid solution heat treatment is carried out, to obtain a printed aluminum alloy.

[0052] Example 3

[0053] Take 10 g of vanadium carbide powder, 10 g of titanium powder, 480 g of 2024 aluminum alloy powder, and place them in a 5 L stainless steel tank. Use a three-dimensional mixer to mix and disperse for 16 h, with a ball-to-material ratio of 1:1. Take out the original alloy powder after three-dimensional mixing and dispersion (theoretically calculated to obtain the original alloy powder, the content of carbon element is 0.38 wt.%; the content of vanadium element is 1.62 wt.%; the content of titanium element is 2.00 wt.%), and sieve the particle size with a 250 mesh screen. The <250 mesh powder is placed in a vacuum oven and dried at 100℃ for 2 h. Use a laser powder bed fusion 3D printer for additive manufacturing, with a laser power of 250 W, a laser scanning speed of 600 mm / s, a scanning line spacing of 100 μm, a powder layer thickness of 30 μm, a laser layer rotation angle of 67°, and a powder feeding ratio of 2.0, to obtain a printed aluminum alloy. The printed aluminum alloy is subjected to solid solution heat treatment, with parameters of a solid solution temperature of 530℃, a holding time of 0.5 h, and water cooling to room temperature, to prepare a solid solution aluminum alloy.

[0054] Example 4

[0055] The same as example 3, except that no solid solution heat treatment is performed, to prepare a printed aluminum alloy.

[0056] Example 5

[0057] Take 10 g of vanadium carbide powder, 10 g of titanium powder, 480 g of 2024 aluminum alloy powder, and place them in a 5 L stainless steel tank. Use a three-dimensional mixer to mix and disperse for 16 h, with a ball-to-material ratio of 1:1. Take out the original alloy powder after three-dimensional mixing and dispersion (theoretically calculated to obtain the original alloy powder, the content of carbon element is 0.38 wt.%; the content of vanadium element is 1.62 wt.%; the content of titanium element is 2.00 wt.%), and sieve the particle size with a 250 mesh screen. The <250 mesh powder is placed in a vacuum oven and dried at 100℃ for 2 h. Use a laser powder bed fusion 3D printer for additive manufacturing, with a laser power of 250 W, a laser scanning speed of 600 mm / s, a scanning line spacing of 100 μm, a powder layer thickness of 30 μm, a laser layer rotation angle of 67°, and a powder feeding ratio of 2.0, to obtain a printed aluminum alloy. The printed aluminum alloy is subjected to solid solution heat treatment, with parameters of a solid solution temperature of 530℃, a holding time of 0.5 h, and water cooling to room temperature, to prepare a solid solution aluminum alloy.

[0058] Example 6

[0059] The same as example 5, except that no solid solution heat treatment is performed, to prepare a printed aluminum alloy.

[0060] Example 7

[0061] Take 15 g of vanadium carbide powder, 7.5 g of titanium powder, 475 g of 2024 aluminum alloy powder, and place them in a 5L stainless steel tank. Mix and disperse for 16 h using a three-dimensional mixer, with a ball-to-powder ratio of 1:1. Take out the original alloy powder after three-dimensional mixing and dispersion (theoretically calculated to obtain the original alloy powder, the content of carbon element is 0.57wt.%; the content of vanadium element is 2.43wt.%; the content of titanium element is 1.50wt.%), sieve the particle size with a 250 mesh screen, and dry the <250 mesh powder in a vacuum oven at 100°C for 2h. Additive manufacturing is performed using a laser powder bed fusion 3D printer, with a laser power of 250W, a laser scanning speed of 1000mm / s, a scanning line spacing of 80μm, a powder layer thickness of 30μm, a laser layer rotation angle of 67°, and a powder feeding ratio of 3.2, to obtain a printed aluminum alloy; the printed aluminum alloy is subjected to solid solution heat treatment, with parameters of a solid solution temperature of 530°C, a holding time of 1h, and water cooling to room temperature, to obtain a solid solution aluminum alloy.

[0062] Example 8

[0063] The same as example 7, except that no solid solution heat treatment is performed, to obtain a printed aluminum alloy.

[0064] Example 9

[0065] Take 15 g of vanadium carbide powder, 5 g of titanium powder, and 480 g of 2024 aluminum alloy powder, and place them in a 5L stainless steel tank. Mix and disperse for 16 h using a three-dimensional mixer, with a ball-to-powder ratio of 1:1. Take out the original alloy powder after three-dimensional mixing and dispersion (theoretically calculated to obtain the original alloy powder, the content of carbon element is 0.57wt.%; the content of vanadium element is 2.43wt.%; the content of titanium element is 1.00wt.%), sieve the particle size with a 250 mesh screen, and dry the <250 mesh powder in a vacuum oven at 100°C for 2h. Additive manufacturing is performed using a laser powder bed fusion 3D printer, with a laser power of 340W, a laser scanning speed of 1200mm / s, a scanning line spacing of 120μm, a powder layer thickness of 30μm, a laser layer rotation angle of 67°, and a powder feeding ratio of 3.4, to obtain a printed aluminum alloy; the printed aluminum alloy is subjected to solid solution heat treatment, with parameters of a solid solution temperature of 540°C, a holding time of 0.5h, and water cooling to room temperature, to obtain a solid solution aluminum alloy.

[0066] Example 10

[0067] The same as example 9, except that no solid solution heat treatment is performed, to obtain a printed aluminum alloy.

[0068] Figure 1Room temperature as-printed stress-strain curves of the as-printed aluminum alloys prepared for Example 2, Example 4, Example 6, Example 8, Example 10 and Comparative Example 2 and the as-printed aluminum alloy prepared for Comparative Example 1.

[0069] Figure 2 Room temperature post-solution treatment stress-strain curves of the solution treated aluminum alloys prepared for Example 1, Example 3, Example 5, Example 7 and Example 9.

[0070] Table 1 is the mechanical properties of Comparative Example 1 and Comparative Example 2 based on different compositions and printing parameters.

[0071] Table 2 is the mechanical properties of Examples 1-10 based on different compositions and printing parameters.

[0072] Table 1

[0073]

[0074]

[0075] Table 2

[0076]

[0077] In combination Figure 1 , Figure 2 and Table 2, it can be seen that the as-printed aluminum alloys exhibit high plasticity, and the plasticity decreases with the increase of the content, indicating that there is an optimal solution for the content of the added elements, and the continued addition causes the plasticity to decrease; the plasticity of the solution treated aluminum alloys obtained after solution heat treatment decreases, but the yield strength and tensile strength are further improved, which are much greater than those of the as-printed, indicating that the high strength and high plasticity of the aluminum alloys can be flexibly converted by heat treatment means, which depends on the application scenario.

[0078] In combination Figure 1As can be seen from Table 1 and Table 2, in Comparative Example 1, no vanadium element, titanium element and carbon element are added, and the mechanical properties of the as-printed aluminum alloy prepared are compared with the as-printed aluminum alloys prepared in Example 2, Example 4, Example 6, Example 8 and Example 10, and the tensile strength is only 33.7 MPa, which is far less than that of the examples, because the single 2024 aluminum alloy printing has defects such as cracks and holes, lacks nucleation sites during solidification, resulting in coarse grains and poor mechanical properties. In Comparative Example 2, only titanium element and carbon element are added in the form of titanium carbide powder, and the performance is obviously improved compared with the single 2024 as-printed, and the tensile strength reaches 434.76 MPa, but is lower than that of the examples, because the nucleation ability of single TiC is poor, and the introduction of V can further increase the nucleation ability, and the in-situ formed new ceramic phase and alloy phase can be used as heterogeneous nucleation sites, and the nucleation ability is obviously improved, and the grain size is refined, so that the performance of the examples is obviously improved compared with that of Comparative Example 2.

[0079] Example 11

[0080] 10 g of vanadium carbide powder, 10 g of titanium powder and 480 g of 7075 aluminum alloy powder were weighed and placed in a 5 L stainless steel tank. The three-dimensional mixer was used for mixing and dispersing for 16 h, and the ball-to-material ratio was 1:1. The original alloy powder after three-dimensional mixing and dispersion (the theoretical calculation showed that the content of carbon element in the original alloy powder was 0.38 wt.%, the content of vanadium element was 1.62 wt.% and the content of titanium element was 2 wt.%) was sieved by a 250 mesh sieve, and the powder with particle size less than 250 meshes was dried in a vacuum oven at 100°C for 2 h. Additive manufacturing was carried out using a laser powder bed fusion 3D printer, the laser power was 220 W, the laser scanning speed was 600 mm / s, the scanning line spacing was 100 μm, the powder layer thickness was 40 μm, the laser layer rotation angle was 67°, and the powder feeding ratio was 2.4, to obtain an as-printed aluminum alloy. The as-printed aluminum alloy was heat treated, and the parameters were as follows: the solid solution temperature was 480°C, the holding time was 1 h, the water cooling was to room temperature, then the temperature was increased to 120°C, the holding time was 18 h, and the air cooling was to room temperature, to prepare a T6 state aluminum alloy.

[0081] Example 12

[0082] The same as Example 11, except that no heat treatment was carried out, to prepare an as-printed aluminum alloy.

[0083] Example 13

[0084] Take 10 g of vanadium carbide powder, 10 g of titanium powder, and 480 g of 7075 aluminum alloy powder, and place them in a 5 L stainless steel tank. Disperse the mixture for 16 h using a three-dimensional mixer with a ball-to-powder ratio of 1:1. Take out the original alloy powder after three-dimensional mixing and dispersion (the theoretical calculation shows that the content of carbon in the original alloy powder is 0.38 wt.%, the content of vanadium is 1.62 wt.%, and the content of titanium is 2 wt.%), sieve the particle size with a 250 mesh sieve, and dry the <250 mesh powder in a vacuum oven at 100°C for 2 h. Additive manufacturing is performed using a laser powder bed fusion 3D printer with a laser power of 250 W, a laser scanning speed of 1200 mm / s, a scanning line spacing of 80 μm, a powder layer thickness of 30 μm, a laser layer rotation angle of 67°, and a powder feeding ratio of 2.4 to obtain a printed aluminum alloy. The printed aluminum alloy is heat treated with the parameters of a solid solution temperature of 530°C, a holding time of 1 h, water cooling to room temperature, re-heating to 150°C, a holding time of 8 h, and air cooling to room temperature to obtain a T6 state aluminum alloy.

[0085] Example 14

[0086] The same as Example 13, except that no heat treatment is performed to obtain a printed aluminum alloy.

[0087] Figure 3 The room temperature stress-strain curve of the printed aluminum alloy prepared in Example 12 and Example 14 is shown in Table 3.

[0088] Figure 4 The room temperature stress-strain curve of the T6 state aluminum alloy prepared in Example 11 and Example 13 after solid solution + aging treatment is shown in Table 3.

[0089] Table 3 shows the mechanical properties of Examples 11-14 based on different compositions and printing parameters.

[0090] Table 3

[0091]

[0092]

[0093] In combination Figure 3 , Figure 4 and Table 3, it can be seen that the addition of VC and Ti improves the overall strength and plasticity of the 7075 aluminum alloy, and the plasticity of the printed state is better than that of the heat treated state, while the tensile strength and yield strength can be further improved after heat treatment.

[0094] Example 15

[0095] Take 9.5 g of titanium carbide powder, 7.5 g of vanadium powder, 473 g of 2024 aluminum alloy powder, and place them in a 5L stainless steel tank. Disperse the mixture for 16 h using a three-dimensional mixer, with a ball-to-material ratio of 1:1. Take out the original alloy powder after three-dimensional mixing and dispersion (theoretically calculated to obtain the original alloy powder, the content of carbon element is 0.38wt.%; the content of vanadium element is 1.5wt.%; the content of titanium element is 1.52wt.%), sieve the particle size with a 250 mesh screen, and dry the <250 mesh powder in a vacuum oven at 100°C for 2h. Additive manufacturing is performed using a laser powder bed fusion 3D printer, with a laser power of 220W, a laser scanning speed of 1000mm / s, a scanning line spacing of 80μm, a powder layer thickness of 30μm, a laser layer rotation angle of 67°, and a powder feeding ratio of 2.0, to obtain the printed aluminum alloy.

[0096] Example 16

[0097] Take 9.5 g of titanium carbide powder, 7.5 g of vanadium powder, 473 g of 2024 aluminum alloy powder, and place them in a 5L stainless steel tank. Disperse the mixture for 16 h using a three-dimensional mixer, with a ball-to-material ratio of 1:1. Take out the original alloy powder after three-dimensional mixing and dispersion (theoretically calculated to obtain the original alloy powder, the content of carbon element is 0.38wt.%; the content of vanadium element is 1.5wt.%; the content of titanium element is 1.52wt.%), sieve the particle size with a 250 mesh screen, and dry the <250 mesh powder in a vacuum oven at 100°C for 2h. Additive manufacturing is performed using a laser powder bed fusion 3D printer, with a laser power of 220W, a laser scanning speed of 1000mm / s, a scanning line spacing of 80μm, a powder layer thickness of 30μm, a laser layer rotation angle of 67°, and a powder feeding ratio of 2.0, to obtain the printed aluminum alloy.

[0098] Example 17

[0099] Take 9.5 g of titanium carbide powder, 7.5 g of vanadium powder, 473 g of 2024 aluminum alloy powder, and place them in a 5L stainless steel tank. Disperse the mixture for 16 h using a three-dimensional mixer, with a ball-to-material ratio of 1:1. Take out the original alloy powder after three-dimensional mixing and dispersion (theoretically calculated to obtain the original alloy powder, the content of carbon element is 0.38wt.%; the content of vanadium element is 1.5wt.%; the content of titanium element is 1.52wt.%), sieve the particle size with a 250 mesh screen, and dry the <250 mesh powder in a vacuum oven at 100°C for 2h. Additive manufacturing is performed using a laser powder bed fusion 3D printer, with a laser power of 220W, a laser scanning speed of 1000mm / s, a scanning line spacing of 80μm, a powder layer thickness of 30μm, a laser layer rotation angle of 67°, and a powder feeding ratio of 2.0, to obtain the printed aluminum alloy.

[0100] Figure 5Room temperature as-printed stress-strain curves of the as-printed aluminum alloys prepared for Examples 15-17;

[0101] Table 4 is the mechanical properties of the as-printed aluminum alloys prepared for Examples 15-17 based on different compositions and printing parameters.

[0102] Table 4

[0103]

[0104] In combination Figure 5 As can be seen from Table 4: after adding TiC and V, the overall performance is improved, and with the increase of TiC content, the plasticity gradually increases, which is due to the high coherency of TiC and aluminum matrix interface, reducing the stress concentration at the interface, and reducing the generation and propagation of interface cracks during plastic deformation.

[0105] Example 18

[0106] Take 1.71 g of carbon powder, 7.29 g of vanadium powder, 10 g of titanium powder, and 473 g of 2024 aluminum alloy powder, and place them in a 5L stainless steel tank. Mix and disperse for 16h using a three-dimensional mixer, with a ball-to-powder ratio of 1:1. Take out the original alloy powder after three-dimensional mixing and dispersion (theoretical calculation shows that the content of carbon element in the original alloy powder is 0.34wt.%; the content of vanadium element is 1.46wt.%; the content of titanium element is 2.00wt.%), sieve the particle size with a 250 mesh screen, and dry the <250 mesh powder in a vacuum oven at 100°C for 2h. Use a laser powder bed fusion 3D printer for additive manufacturing, with a laser power of 250W, a laser scanning speed of 600mm / s, a scanning line spacing of 110μm, a powder layer thickness of 30μm, a laser layer rotation angle of 67°, and a powder feeding ratio of 2.8, to obtain the as-printed aluminum alloy.

[0107] Example 19

[0108] Take 1.71 g of carbon powder, 7.29 g of vanadium powder, 10 g of titanium powder, and 473 g of 2024 aluminum alloy powder, and place them in a 5L stainless steel tank. Mix and disperse for 16h using a three-dimensional mixer, with a ball-to-powder ratio of 1:1. Take out the original alloy powder after three-dimensional mixing and dispersion (theoretical calculation shows that the content of carbon element in the original alloy powder is 0.34wt.%; the content of vanadium element is 1.46wt.%; the content of titanium element is 2.00wt.%), sieve the particle size with a 250 mesh screen, and dry the <250 mesh powder in a vacuum oven at 100°C for 2h. Use a laser powder bed fusion 3D printer for additive manufacturing, with a laser power of 320W, a laser scanning speed of 1400mm / s, a scanning line spacing of 120μm, a powder layer thickness of 30μm, a laser layer rotation angle of 67°, and a powder feeding ratio of 3.2, to obtain the as-printed aluminum alloy.

[0109] Figure 6 Room temperature as-printed stress-strain curves of the as-printed aluminum alloys prepared in Examples 18-19;

[0110] Table 5 is the mechanical properties of the as-printed aluminum alloys prepared in Examples 18-19 based on different compositions and printing parameters.

[0111] Table 5

[0112]

[0113] In combination Figure 6 As can be seen from Table 5: after adding carbon powder, vanadium powder and titanium powder, the overall performance is also improved, indicating that when strengthening the aluminum alloy, it is not limited to the addition of the three elements, and the carbide or elemental powder can also play a role in strengthening the performance of the aluminum alloy.

[0114] The above, only for the preferred specific embodiments of the present application, but the scope of protection of the present application is not limited to this, any skilled in the art of the technical personnel in the technical range disclosed by the present application, can easily think of the changes or replacement, should be covered within the scope of protection of the present application. Therefore, the scope of protection of the present application should be subject to the scope of protection of the claims.

Claims

1. A method for preparing an additive manufacturing aluminum alloy with synergistic reinforcement of alloy phase and ceramic phase, characterized in that, The method comprises the following steps: Vanadium, titanium and carbon elements or carbon compounds of vanadium and titanium are added to aluminum alloy or pure aluminum powder to prepare original alloy powder; 3D printing is performed by using the original alloy powder as raw material to obtain a printed aluminum alloy, thereby preparing the additive manufacturing aluminum alloy.

2. The production method according to claim 1, characterized by, The particle size of the original alloy powder is less than or equal to 250 mesh.

3. The preparation method according to claim 1, characterized in that, The content of V element in the original alloy powder is 1.2-2.5 wt.%, the content of C element is 0.29-0.6 wt.% and the content of Ti element is 1.0-2.0 wt.% according to the mass percentage.

4. The preparation method according to claim 1, characterized in that, The 3D printing is selective laser melting printing.

5. The production method according to claim 4, characterized by, The method for preparing the additive manufacturing aluminum alloy further comprises solid solution heat treatment of the printed aluminum alloy.

6. The production method according to claim 5, characterized by, The specific operation of the solid solution heat treatment comprises the following steps: heating to 480-530 DEG C, solid solution heat treatment for 0.5-1 h, water cooling to room temperature.

7. The preparation method according to claim 4, characterized in that, The method for preparing the additive manufacturing aluminum alloy further comprises solid solution + aging heat treatment.

8. The preparation method according to claim 7, characterized in that, The specific operation of the solid solution + aging heat treatment comprises the following steps: heating to 480-530 DEG C, solid solution heat treatment for 0.5-1 h, water cooling to room temperature; heating to 120-150 DEG C, heat preservation for 0.5-24 h, air cooling to room temperature. 9.An additive manufacturing aluminum alloy with alloy phase and ceramic phase synergistic strengthening, which is prepared by the method according to any one of claims 1-8. 10.Use of the additive manufacturing aluminum alloy according to claim 9 in preparation of aerospace and vehicle frame structures.

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