A heat-treatment-free high-strength and tough deformable aluminum alloy and preparation method thereof

Abstract

The present invention provides a heat-treatment-free high-strength and tough deformable aluminum alloy and a preparation method, belonging to the technical field of high-pressure die-casting aluminum alloys. Wherein, the components and weight percentages of the aluminum alloy are: 0.6-1.2 weight % Si, 0.4-0.5 weight % Fe, up to 0.1 weight % Cu, up to 0.2 weight % Zn, 0.4-0.9 weight % Mn, 0.6-1.3 weight % Mg, up to 0.15 weight % Ti, 0.1-0.3 weight % Cr, 3-6 weight % La, 6-12 weight % Ce, the weight ratio of La to Ce is 1:2, a single impurity element is up to 0.05 weight %, and the rest is Al. The present invention refines the internal grains of the material by adding appropriate amounts of La and Ce rare earth elements, changes the second phase composition and proportion of the material, and significantly improves the mechanical properties of the material. The present invention improves the fluidity of the material solution by adding an appropriate amount of Si element, promotes rapid cooling of the material, reduces shrinkage and shrinkage cavities, and improves the mechanical properties of the material.

Description

Technical Field

[0001] The invention belongs to the technical field of high-pressure die-casting aluminum alloys, and in particular relates to a heat-treatment-free high-strength and toughness deformable aluminum alloy and a preparation method thereof. Background Art

[0002] With the rapid development of science and technology and the continuous expansion of high-tech fields, aluminum alloy, as a lightweight and high-strength material, has an increasingly wide range of applications, especially in the automotive, aerospace and other industrial fields, showing great application potential. In order to achieve more efficient and wider application of aluminum alloys in these fields, it is particularly important to prepare high-quality and high-performance aluminum alloy ingots. Among them, 6082 aluminum alloy, as an Al-Mg-Si series alloy, has been widely used in key components of automotive parts such as anti-collision beams, door sill beams, battery boxes, etc. due to its heat-treatable strengthening characteristics, medium strength, excellent welding performance and corrosion resistance. However, with the continuous advancement of automobile manufacturing technology and the increasing requirements of consumers for automobile safety performance, 6082 aluminum alloy materials face many challenges in practical applications.

[0003] Specifically, the 6082 aluminum alloy prepared by traditional technology often has unstable performance when extruded into parts. The sampling test results of different parts show that there are large differences in its mechanical properties, especially the elongation of the material, which is generally difficult to break through the bottleneck of 10%, and in most cases can only reach about 8%, which limits its application in situations where higher toughness requirements are required. In addition, with the continuous upgrading of automobile safety standards, especially in vehicle collision tests, higher requirements are put forward for the energy absorption capacity of parts, that is, the material is required to have higher toughness, which is specifically manifested in the need to significantly improve its elongation to better absorb collision energy and protect the safety of occupants.

[0004] Therefore, the limitations of 6082 aluminum alloy in the existing technology in terms of material properties have become a key factor restricting its further development in terms of lightweighting and improving safety performance of automobiles. In order to overcome these technical difficulties and meet the urgent demand of the automotive industry for high-performance aluminum alloy materials, it is urgent to conduct in-depth research on 6082 aluminum alloy, explore new preparation processes or improve existing processes to achieve significant improvements in its material mechanical properties, thereby promoting wider application of aluminum alloy materials in the field of high-tech. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention aims to provide a high-strength and tough deformable aluminum alloy that does not require heat treatment and a preparation method thereof, by adding an appropriate amount of Si element to improve the fluidity of the material solution, promote rapid cooling of the material, and reduce shrinkage and shrinkage cavities; by adding an appropriate amount of La and Ce rare earth elements, the internal grains of the material are refined, the second phase composition and proportion of the material are changed, and the mechanical properties of the material are improved.

[0006] In a first aspect, the present invention discloses a heat-treatment-free high-strength and tough deformable aluminum alloy, the components and weight percentages of the aluminum alloy are:

[0007] 0.6-1.2 wt% Si, 0.4-0.5 wt% Fe, up to 0.1 wt% Cu, up to 0.2 wt% Zn, 0.4-0.9 wt% Mn, 0.6-1.3 wt% Mg, up to 0.15 wt% Ti, 0.1-0.3 wt% Cr, 3-6 wt% La, 6-12 wt% Ce, up to 0.05 wt% of a single impurity element, and the remainder is Al.

[0008] As a further improvement of the present invention, the weight ratio of the La to the Ce is 1:2.

[0009] In a second aspect, the present invention discloses a method for preparing a heat-treatment-free high-strength and tough deformable aluminum alloy according to the first aspect of the present invention, comprising the following steps:

[0010] Step 1: gradually heating the furnace according to the mass percentage of the aluminum alloy to bake out the water vapor in the furnace, and during the heating process, placing A00 aluminum ingots, 6082 aluminum alloy containing Al, Si, Fe, Cu, Zn, Mn, Mg, Ti, Cr, and silicon weighed in proportion on the side of the furnace for baking, and then putting them into the furnace to heat and melt;

[0011] Step 2: After the A00 aluminum ingot, 6082 aluminum alloy and silicon are dissolved, the AlRe10 master alloy is placed on the side of the furnace for baking and then put into the furnace, stirred several times and allowed to stand;

[0012] The AlRe10 master alloy is a master alloy containing La and Ce in a weight ratio of 1:2.

[0013] Step 3: Use a degasser to press the aluminum alloy refining agent into the refining machine, pass 99.999% argon gas, degas, then remove the slag and let it stand;

[0014] Step 4: Detect whether the aluminum alloy composition reaches a preset mass percentage. If so, proceed to step 5. If not, add elements that do not reach the preset mass percentage so that the elements that do not reach the preset mass percentage reach the preset mass percentage.

[0015] Step 5: Detect the gas content, and when the density equivalent is ≤0.2%, proceed to step 6, otherwise continue the refining and degassing operation in step 3;

[0016] Step 6: Perform high pressure die casting through high pressure die casting equipment.

[0017] As a further improvement of the present invention, in step 1, the furnace side baking time of the A00 aluminum ingot, 6082 aluminum alloy and silicon is 30 minutes.

[0018] As a further improvement of the present invention, in step 1, the temperature of the aluminum liquid is set to 720°C and the furnace temperature is set to 780°C.

[0019] As a further improvement of the present invention, in step 2, the furnace-side baking time of the intermediate alloy is 30 minutes.

[0020] As a further improvement of the present invention, in step 2, the standing time is 30 minutes.

[0021] As a further improvement of the present invention, in step 3, the weight ratio of the aluminum alloy refining agent in the aluminum liquid is 0.1%~0.2%, the components of the aluminum alloy refining agent are NaF and NaCl, the weight ratio of the NaF and the NaCl is 1:1, and the degassing time is 20 minutes.

[0022] As a further improvement of the present invention, in step 6, the high-pressure die-casting equipment includes a vacuum system, an oil circulation mold temperature controller, and a barrel heating device.

[0023] As a further improvement of the present invention, in step 6, the process parameters of high pressure die casting are: mold cavity vacuum ≤50Mbar, injection speed 2.5±0.5m / s, mold temperature 130±10℃, and aluminum alloy liquid temperature 680±10℃.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention adds appropriate amounts of La and Ce rare earth elements to refine the internal grains of the material and change the second phase composition and proportion of the material. The tensile strength can reach above 450 MPa, the yield strength can reach above 380 MPa, and the elongation is maintained at above 10%, thereby significantly improving the mechanical properties of the material.

[0026] The invention improves the fluidity of the material solution by adding a proper amount of Si element, promotes rapid cooling of the material, reduces shrinkage and shrinkage cavities, and improves the mechanical properties of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A 1000-fold metallographic structure diagram of the heat-treatment-free, high-strength and toughness deformed aluminum alloy material disclosed in Example 6 of the present invention is shown. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the present invention will combine the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments, wherein step 1, step 2... in the embodiments described in the present invention do not limit the only execution steps of the present invention; the basic principles of the present invention defined in the description of the present invention can be applied to other implementation schemes, variant schemes, improved schemes, equivalent schemes and other technical schemes that do not deviate from the spirit and scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] The principle of the present invention is that the present invention refines the internal grains of the material and changes the second phase composition and proportion of the material by adding appropriate amounts of La and Ce rare earth elements, thereby significantly improving the mechanical properties of the material; by adding appropriate amounts of Si elements, the fluidity of the material solution is improved, the material is quickly cooled, and shrinkage cavities are reduced; and the mechanical properties of the material are improved.

[0030] In a first aspect, an embodiment of the present invention discloses a heat-treatment-free high-strength and tough deformable aluminum alloy, wherein the components and weight percentages of the aluminum alloy are:

[0031] 0.6-1.2 wt% Si, 0.4-0.5 wt% Fe, up to 0.1 wt% Cu, up to 0.2 wt% Zn, 0.4-0.9 wt% Mn, 0.6-1.3 wt% Mg, up to 0.15 wt% Ti, 0.1-0.3 wt% Cr, 3-6 wt% La, 6-12 wt% Ce, up to 0.05 wt% of a single impurity element, and the remainder is Al.

[0032] In a preferred embodiment, the weight ratio of La to Ce is 1:2.

[0033] It should be noted that any value within the weight percentage range of the aluminum alloy components belongs to the protection scope of the present invention. For example, the weight % of Si can be 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2. For example, the weight % of Fe can be 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.5. For example, the weight % of Cu can be 0.05, 0.06, 0.07, 0.08, 0.09, 0.1. For example, the weight % of Zn can be 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2. Illustratively, the weight % of Mn may be 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.5, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.6, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.7, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9. Illustratively, the weight % of Mg may be 0.6, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.7, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, 0.93 , 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, 1, 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09, 1.1, 1.11, 1.12, 1.13, 1.14, 1.15, 1.16, 1.17, 1.18, 1.19, 1.2, 1.21, 1.22, 1.23, 1.24, 1.25, 1.26, 1.27, 1.28, 1.29, 1.3. For example, the weight % of Ti can be 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15.3.4,3.5,3.6,3.7,3.8,3.9,4,4.1,4.2,4.3,4.4,4.5,4.6,4.7,4.8,4.9,5,5.1,5.2,5.3,5.4,5.5,5.6,5.7,5.8,5.9,6. Illustratively, the weight % of Ce may be 6, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, 7, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 8, 8.1, 8.2, 8.3, 8.4, 8.5, 8.6, 8.7, 8.8, 8.9, 9, 9. 1, 9.2, 9.3, 9.4, 9.5, 9.6, 9.7, 9.8, 9.9, 10, 10.1, 10.2, 10.3, 10.4, 10.5, 10.6, 10.7, 10.8, 10.9, 11, 11.1, 11.2, 11.3, 11.4, 11.5, 11.6, 11.7, 11.8, 11.9, 12.

[0034] In a second aspect, an embodiment of the present invention discloses a method for preparing a heat-treatment-free high-strength and tough deformable aluminum alloy according to the first aspect of the present invention, comprising the following steps:

[0035] Step 1: gradually heating the furnace according to the mass percentage of the aluminum alloy to bake out the water vapor in the furnace, and during the heating process, placing A00 aluminum ingots, 6082 aluminum alloy containing Al, Si, Fe, Cu, Zn, Mn, Mg, Ti, Cr, and silicon weighed in proportion on the side of the furnace for baking, and then putting them into the furnace to heat and melt;

[0036] Step 2: After the A00 aluminum ingot, 6082 aluminum alloy and silicon are dissolved, the AlRe10 master alloy is placed on the side of the furnace for baking and then put into the furnace, stirred several times and allowed to stand;

[0037] The AlRe10 master alloy is a master alloy containing La and Ce in a weight ratio of 1:2.

[0038] Step 3: Use a degasser to press the aluminum alloy refining agent into the refining machine, pass 99.999% argon gas, degas, then remove the slag and let it stand;

[0039] Step 4: Detect whether the aluminum alloy composition reaches a preset mass percentage. If so, proceed to step 5. If not, add elements that do not reach the preset mass percentage so that the elements that do not reach the preset mass percentage reach the preset mass percentage.

[0040] Step 5: Detect the gas content, and when the density equivalent is ≤0.2%, proceed to step 6, otherwise continue the refining and degassing operation in step 3;

[0041] Step 6: Perform high pressure die casting through high pressure die casting equipment.

[0042] In a preferred embodiment, in step 1, the furnace-side baking time of the A00 aluminum ingot, 6082 aluminum alloy and silicon is 30 minutes.

[0043] In a preferred embodiment, in step 1, the temperature of the aluminum liquid is set to 720°C and the furnace temperature is set to 780°C.

[0044] In a preferred embodiment, in step 2, the furnace-side baking time of the intermediate alloy is 30 minutes.

[0045] In a preferred embodiment, in step 2, the standing time is 30 minutes.

[0046] In a preferred embodiment, in step 3, the weight ratio of the aluminum alloy refining agent in the aluminum liquid is 0.1%-0.2%, the components of the aluminum alloy refining agent are NaF and NaCl, the weight ratio of the NaF and the NaCl is 1:1, and the degassing time is 20 minutes.

[0047] In a preferred embodiment, in step 6, the high pressure die casting equipment includes a vacuum system, an oil circulation mold temperature controller, and a barrel heating device.

[0048] In a preferred embodiment, in step 6, the process parameters of high pressure die casting are: mold cavity vacuum ≤ 50 Mbar, injection speed 2.5±0.5 m / s, mold temperature 130±10°C, and aluminum alloy liquid temperature 680±10°C.

[0049] Example 1

[0050] A heat-treatment-free high-strength and tough deformable aluminum alloy, the components and weight percentages of the aluminum alloy are:

[0051] 0.6 wt% Si, 0.46 wt% Fe, 0.09 wt% Cu, 0.18 wt% Zn, 0.71 wt% Mn, 0.9 wt% Mg, 0.11 wt% Ti, 0.21 wt% Cr, 3 wt% La, 6 wt% Ce, the weight ratio of La to Ce is 1:2, the maximum amount of a single impurity element is 0.05 wt%, and the rest is Al.

[0052] A method for preparing the aluminum alloy of this embodiment comprises the following steps:

[0053] Step 1: gradually increase the temperature in the furnace according to the mass percentage of the aluminum alloy, bake out the water vapor in the furnace, and during the heating process, place the A00 aluminum ingot, 6082 aluminum alloy containing Al, Si, Fe, Cu, Zn, Mn, Mg, Ti, Cr, and silicon weighed in proportion on the side of the furnace for baking for 30 minutes, and then put them into the furnace for heating and melting. The aluminum liquid temperature is set to 720°C and the furnace temperature is set to 780°C;

[0054] Step 2: After the A00 aluminum ingot, 6082 aluminum alloy and silicon are dissolved, place the AlRe10 master alloy on the side of the furnace and bake for 30 minutes, then put it into the furnace, stir it several times, and let it stand for 30 minutes;

[0055] The AlRe10 master alloy is a master alloy containing La and Ce in a weight ratio of 1:2.

[0056] Step 3: Use a mobile rotary degasser to press an aluminum alloy refining agent into the aluminum liquid for refining, the weight ratio of the aluminum alloy refining agent in the aluminum liquid is 0.1% to 0.2%, the components of the aluminum alloy refining agent are NaF and NaCl, the weight ratio of the NaF to the NaCl is 1:1, 99.999% argon is introduced, degassing for 20 minutes, then slag is removed, and the mixture is allowed to stand;

[0057] Step 4: Detect whether the aluminum alloy composition reaches a preset mass percentage by using an electric spark direct reading spectrometer. If so, proceed to step 5. If not, add elements that do not reach the preset mass percentage so that the elements that do not reach the preset mass percentage reach the preset mass percentage.

[0058] Step 5: Detect the gas content by a hydrogen detector, and when the density equivalent is ≤0.2%, proceed to step 6, otherwise continue the refining and degassing operation in step 3;

[0059] Step 6: High-pressure die casting is performed using a LK 280T die casting machine. The high-pressure die casting equipment includes a vacuum system, an oil circulation mold temperature controller, and a barrel heating device. The process parameters of high-pressure die casting are: mold cavity vacuum ≤ 50Mbar, injection speed 2.5±0.5m / s, mold temperature 130±10℃, and aluminum alloy liquid temperature 680±10℃.

[0060] Example 2

[0061] A heat-treatment-free high-strength and tough deformable aluminum alloy, the components and weight percentages of the aluminum alloy are:

[0062] 0.6 wt% Si, 0.45 wt% Fe, 0.08 wt% Cu, 0.19 wt% Zn, 0.72 wt% Mn, 0.89 wt% Mg, 0.12 wt% Ti, 0.21 wt% Cr, 5 wt% La, 10 wt% Ce, the weight ratio of La to Ce is 1:2, the maximum amount of a single impurity element is 0.05 wt%, and the rest is Al.

[0063] A method for preparing the aluminum alloy of this embodiment, the steps are the same as the method for preparing the aluminum alloy of Example 1.

[0064] Example 3

[0065] A heat-treatment-free high-strength and tough deformable aluminum alloy, the components and weight percentages of the aluminum alloy are:

[0066] 0.6 wt% Si, 0.47 wt% Fe, 0.09 wt% Cu, 0.19 wt% Zn, 0.7 wt% Mn, 0.9 wt% Mg, 0.12 wt% Ti, 0.22 wt% Cr, 6 wt% La, 12 wt% Ce, the weight ratio of La to Ce is 1:2, the maximum amount of a single impurity element is 0.05 wt%, and the rest is Al.

[0067] A method for preparing the aluminum alloy of this embodiment, the steps are the same as the method for preparing the aluminum alloy of Example 1.

[0068] Example 4

[0069] A heat-treatment-free high-strength and tough deformable aluminum alloy, the components and weight percentages of the aluminum alloy are:

[0070] 0.9 wt% Si, 0.45 wt% Fe, 0.07 wt% Cu, 0.18 wt% Zn, 0.69 wt% Mn, 0.88 wt% Mg, 0.11 wt% Ti, 0.20 wt% Cr, 3 wt% La, 6 wt% Ce, the weight ratio of La to Ce is 1:2, the maximum amount of a single impurity element is 0.05 wt%, and the rest is Al.

[0071] A method for preparing the aluminum alloy of this embodiment, the steps are the same as the method for preparing the aluminum alloy of Example 1.

[0072] Example 5

[0073] A heat-treatment-free high-strength and tough deformable aluminum alloy, the components and weight percentages of the aluminum alloy are:

[0074] 0.9 wt% Si, 0.44 wt% Fe, 0.09 wt% Cu, 0.19 wt% Zn, 0.69 wt% Mn, 0.91 wt% Mg, 0.11 wt% Ti, 0.22 wt% Cr, 5 wt% La, 10 wt% Ce, the weight ratio of La to Ce is 1:2, the maximum amount of a single impurity element is 0.05 wt%, and the rest is Al.

[0075] A method for preparing the aluminum alloy of this embodiment, the steps are the same as the method for preparing the aluminum alloy of Example 1.

[0076] Example 6

[0077] A heat-treatment-free high-strength and tough deformable aluminum alloy, the components and weight percentages of the aluminum alloy are:

[0078] 0.9 wt% Si, 0.46 wt% Fe, 0.07 wt% Cu, 0.19 wt% Zn, 0.71 wt% Mn, 0.91 wt% Mg, 0.11 wt% Ti, 0.21 wt% Cr, 6 wt% La, 12 wt% Ce, the weight ratio of La to Ce is 1:2, the maximum amount of a single impurity element is 0.05 wt%, and the rest is Al.

[0079] A method for preparing the aluminum alloy of this embodiment, the steps are the same as the method for preparing the aluminum alloy of Example 1.

[0080] Example 7

[0081] A heat-treatment-free high-strength and tough deformable aluminum alloy, the components and weight percentages of the aluminum alloy are:

[0082] 1.2 wt% Si, 0.45 wt% Fe, 0.09 wt% Cu, 0.18 wt% Zn, 0.7 wt% Mn, 0.88 wt% Mg, 0.11 wt% Ti, 0.22 wt% Cr, 3 wt% La, 6 wt% Ce, the weight ratio of La to Ce is 1:2, the maximum amount of a single impurity element is 0.05 wt%, and the rest is Al.

[0083] A method for preparing the aluminum alloy of this embodiment, the steps are the same as the method for preparing the aluminum alloy of Example 1.

[0084] Example 8

[0085] A heat-treatment-free high-strength and tough deformable aluminum alloy, the components and weight percentages of the aluminum alloy are:

[0086] 1.2 wt% Si, 0.45 wt% Fe, 0.09 wt% Cu, 0.18 wt% Zn, 0.71 wt% Mn, 0.89 wt% Mg, 0.12 wt% Ti, 0.23 wt% Cr, 5 wt% La, 10 wt% Ce, the weight ratio of La to Ce is 1:2, the maximum amount of a single impurity element is 0.05 wt%, and the rest is Al.

[0087] A method for preparing the aluminum alloy of this embodiment, the steps are the same as the method for preparing the aluminum alloy of Example 1.

[0088] Example 9

[0089] A heat-treatment-free high-strength and tough deformable aluminum alloy, the components and weight percentages of the aluminum alloy are:

[0090] 1.2 wt% Si, 0.47 wt% Fe, 0.08 wt% Cu, 0.19 wt% Zn, 0.72 wt% Mn, 0.9 wt% Mg, 0.12 wt% Ti, 0.21 wt% Cr, 6 wt% La, 12 wt% Ce, the weight ratio of La to Ce is 1:2, the maximum amount of a single impurity element is 0.05 wt%, and the rest is Al.

[0091] A method for preparing the aluminum alloy of this embodiment, the steps are the same as the method for preparing the aluminum alloy of Example 1.

[0092] For the above example, a 3mm×80mm×200mm flat die test piece was prepared, and the mechanical properties were measured by a Sansi tensile machine and an imported extensometer, with a tensile rate of 1mm / s. The tensile test specimens were processed strictly in accordance with the proportional specimens in GB / T228.1 2010, and the test results are shown in Table 1:

[0093] Table 1:

[0094]

[0095] From the test results in Table 1, it can be seen that the tensile strength of the aluminum alloy materials of Examples 1 to 9 of the present invention reaches more than 410 MPa, the yield strength reaches more than 370 MPa, and the elongation reaches more than 10%. Figure 1As shown in the figure, when the weight percent of Si is controlled at 0.9, 6 weight percent of La and 12 weight percent of Ce are added, the mechanical properties of the aluminum alloy material are the best, with a tensile strength of 452 MPa, a yield strength of 382 MPa, and an elongation of 14%. Taking the original 6082 aluminum alloy as a control, its tensile strength is less than 410 MPa, its yield strength is less than 370 MPa, and its elongation is about 8%. It can be seen that the aluminum alloy material provided by the present invention effectively improves the mechanical properties of the aluminum alloy material.

Claims

1. A heat-treatment-free high-strength and tough deformable aluminum alloy, characterized in that: The components and weight percentages of the aluminum alloy are: 0.6-1.2 wt% Si, 0.4-0.5 wt% Fe, up to 0.1 wt% Cu, up to 0.2 wt% Zn, 0.4-0.9 wt% Mn, 0.6-1.3 wt% Mg, up to 0.15 wt% Ti, 0.1-0.3 wt% Cr, 3-6 wt% La, 6-12 wt% Ce, the weight ratio of La to Ce is 1:2, a single impurity element is up to 0.05 wt%, and the rest is Al; The aluminum alloy has a tensile strength of ≥450MPa, a yield strength of ≥380Mpa, and an elongation of ≥10%; The aluminum alloy is prepared by a die-casting method.

2. A method for preparing a heat-treatment-free high-strength and tough deformable aluminum alloy according to claim 1, characterized in that: The following steps are involved: Step 1: gradually heating the furnace according to the mass percentage of the aluminum alloy to bake out the water vapor in the furnace, and during the heating process, placing A00 aluminum ingots, 6082 aluminum alloy containing Al, Si, Fe, Cu, Zn, Mn, Mg, Ti, Cr, and silicon weighed in proportion on the side of the furnace for baking, and then putting them into the furnace to heat and melt; Step 2: After the A00 aluminum ingot, 6082 aluminum alloy and silicon are dissolved, the AlRe10 master alloy is placed on the side of the furnace for baking and then put into the furnace, stirred several times and allowed to stand; The AlRe10 master alloy is a master alloy containing La and Ce in a weight ratio of 1:

2. Step 3: Use a degasser to press the aluminum alloy refining agent into the refining machine, pass 99.999% argon gas, degas, then remove the slag and let it stand; Step 4: Detect whether the aluminum alloy composition reaches a preset mass percentage. If so, proceed to step 5. If not, add elements that do not reach the preset mass percentage so that the elements that do not reach the preset mass percentage reach the preset mass percentage. Step 5: Detect the gas content, and when the density equivalent is ≤0.2%, proceed to step 6, otherwise continue the refining and degassing operation in step 3; Step 6: Perform high pressure die casting through high pressure die casting equipment.

3. The method for preparing a heat-treatment-free high-strength and tough deformable aluminum alloy according to claim 2, characterized in that: In the step 1, the furnace side baking time of the A00 aluminum ingot, the 6082 aluminum alloy and the silicon is 30 minutes.

4. The method for preparing a heat-treatment-free high-strength and tough deformable aluminum alloy according to claim 2, characterized in that: In step 1, the aluminum liquid temperature is set to 720°C and the furnace temperature is set to 780°C.

5. The method for preparing the heat-treatment-free high-strength and tough deformable aluminum alloy according to claim 2, characterized in that: In the step 2, the furnace-side baking time of the master alloy is 30 minutes.

6. The method for preparing the heat-treatment-free high-strength and tough deformable aluminum alloy according to claim 2, characterized in that: In the step 2, the standing time is 30 minutes.

7. The method for preparing a heat-treatment-free high-strength and tough deformable aluminum alloy according to claim 2, characterized in that: In the step 3, the weight ratio of the aluminum alloy refining agent in the aluminum liquid is 0.1% to 0.2%, the components of the aluminum alloy refining agent are NaF and NaCl, the weight ratio of the NaF and the NaCl is 1:1, and the degassing time is 20 minutes.

8. The method for preparing a heat-treatment-free high-strength and tough deformable aluminum alloy according to claim 2, characterized in that: In step 6, the high pressure die casting equipment includes a vacuum system, an oil circulation mold temperature controller, and a barrel heating device.

9. The method for preparing a heat-treatment-free high-strength and tough deformable aluminum alloy according to claim 2, characterized in that: In step 6, the process parameters of high pressure die casting are: mold cavity vacuum ≤ 50 Mbar, injection speed 2.5±0.5 m / s, mold temperature 130±10°C, and aluminum alloy liquid temperature 680±10°C.

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