Preparation method of rare earth-containing AlMgSi alloy based on pulse electromagnetic solidification and AlMgSi alloy

Abstract

The application discloses a preparation method of a rare earth-containing AlMgSi alloy based on pulse electromagnetic solidification and the AlMgSi alloy, relates to the technical field of metal metallurgy, and aims to solve the technical problem that the AlMgSi alloy prepared by the prior art has poor distribution uniformity of precipitated phases, low alloy organization refining rate, and thus cannot meet the use requirements of high performance and high homogenization. The preparation method of the rare earth-containing AlMgSi alloy based on pulse electromagnetic solidification comprises the following steps: preparing metal raw materials according to the composition and weight percentage of the AlMgSi alloy; after the metal raw materials of the AlMgSi alloy are smelted into aluminum liquid, the aluminum liquid is subjected to pulse magnetic field treatment above the liquidus of the aluminum liquid, and the AlMgSi alloy is obtained after cooling; and 0.1wt% of lanthanum-cerium mixed rare earth is contained in the aluminum liquid during the pulse magnetic field treatment, and the mass ratio of lanthanum to cerium in the lanthanum-cerium mixed rare earth is 1: (0.5-2).

Description

Technical Field

[0001] This invention relates to the field of metal metallurgy, and more specifically, to a method for preparing rare earth-containing AlMgSi alloys based on pulsed electromagnetic solidification and the AlMgSi alloy itself. Background Technology

[0002] 6000 series aluminum alloys are widely used in aerospace, high-speed rail, automotive, and electronics industries due to their advantages such as lightweight, high strength, easy formability, and high corrosion resistance. However, the coarse, unevenly distributed, and highly anisotropic solidification structure of aluminum alloys, as well as defects such as macro-micro segregation and brittle phase precipitation, can lead to deterioration in subsequent processing performance and a reduction in the overall performance of the finished product, severely limiting the development and application of high-performance, highly homogeneous aluminum alloy sheets.

[0003] The AlMgSi alloys prepared by existing technologies have poor uniformity of precipitate distribution and low alloy microstructure refinement, which makes them unable to meet the requirements of high performance and high homogeneity. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing rare earth-containing AlMgSi alloys based on pulsed electromagnetic solidification and the AlMgSi alloy itself, in order to solve the technical problems of poor uniformity of precipitated phase distribution and low alloy microstructure refinement in AlMgSi alloys prepared by existing technologies, which makes it impossible to meet the requirements of high performance and high homogeneity.

[0005] In a first aspect, the present invention provides a method for preparing rare-earth-containing AlMgSi alloys based on pulsed electromagnetic solidification, comprising:

[0006] Prepare the metal raw materials according to the composition and weight percentage of the AlMgSi alloy;

[0007] After the AlMgSi alloy raw material is smelted into molten aluminum, the molten aluminum is subjected to pulsed magnetic field treatment above the liquidus line, and then cooled to obtain the AlMgSi alloy; wherein:

[0008] The liquidus of the aluminum liquid is 740~760℃. During the pulsed magnetic field treatment, the aluminum liquid is controlled to contain 0.1wt% of lanthanum-cerium mixed rare earth, and the mass ratio of lanthanum to cerium in the lanthanum-cerium mixed rare earth is 1:(0.5~2).

[0009] After being treated with the pulsed magnetic field, the grain size of the AlMgSi alloy is 250~280μm, and the precipitated phases in the AlMgSi alloy matrix are π-type α-AlFeSi and spherical AlFeSiMg or AlFeSiMn.

[0010] Compared with existing technologies, the method for preparing rare-earth-containing AlMgSi alloys based on pulsed electromagnetic solidification of the present invention effectively refines the AlMgSi alloy grains and regulates the size, morphology, and distribution of precipitated phases by controlling the ratio of lanthanum and cerium mixed with rare earth elements in the aluminum melt and by subjecting the aluminum melt to pulsed magnetic field treatment above the liquidus line. This results in AlMgSi alloy matrix precipitates being π-type α-AlFeSi and round AlFeSiMg or AlFeSiMn. Compared with the sharp and elongated β-AlFeSi phase in existing AlMgSi alloys, the above-mentioned π-type α-AlFeSi and round AlFeSiMg or AlFeSiMn precipitates are significantly superior. eSiMg or AlFeSiMn can significantly improve the mechanical properties of AlMgSi alloys. Specifically, applying a pulsed magnetic field above the liquidus line of molten aluminum promotes the dispersion of lanthanum-cerium mixed rare earth elements in the melt through electromagnetic energy, which can fully improve the utilization rate of rare earth elements, maximize the performance potential of rare earth materials, reduce the number of sharp and elongated β-AlFeSi phases, and obtain π-type α-AlFeSi and round AlFeSiMg or AlFeSiMn precipitates. At the same time, it can significantly refine the solidification structure of the aluminum alloy, effectively improving the mechanical properties of the alloy and achieving a good balance of strength and toughness. Furthermore, this invention utilizes pulsed magnetic field technology to significantly reduce the energy barrier and nucleation critical radius of the high-temperature molten alloy under the action of a pulsed magnetic field, promoting the formation of a large number of atomic clusters, providing prerequisites for grain nucleation and homogenization, thereby obtaining fine equiaxed crystals. By promoting the dispersed distribution and uniform nucleation of rare earth elements and refining agents in molten aluminum using electromagnetic energy, a cluster nucleation effect can be created during solidification, which can fully improve the utilization rate of rare earth elements, maximize the potential of rare earth materials to control the size, morphology and distribution of precipitated phases, and avoid the precipitation of brittle rare earth phases. This allows for the development of a new process for refining the grains of highly homogeneous aluminum alloys, giving full play to the advantages of rare earth purification, refining and strengthening aluminum alloy materials. Through the above-mentioned technical solution of the present invention, the technical problems of poor uniformity of precipitated phase distribution and low alloy microstructure refinement rate of AlMgSi alloys prepared by existing technologies are solved, which makes it impossible to meet the requirements of high performance and high homogeneity.

[0011] Furthermore, in the method for preparing rare earth AlMgSi alloy based on pulsed electromagnetic solidification of the present invention, during the pulsed magnetic field treatment, the contents of the aluminum liquid are controlled to contain 0.05~0.2wt% lanthanum and 0.1~0.3wt% aluminum titanium boron master alloy by adjusting the contents of the aluminum lanthanum master alloy and aluminum titanium boron master alloy.

[0012] After being treated with the pulsed magnetic field, the grain size of the AlMgSi alloy is 150~160μm, and the precipitated phases in the AlMgSi alloy matrix are π-type α-AlFeSi and spherical AlFeSiMg or AlFeSiMn.

[0013] Furthermore, in the method for preparing rare earth AlMgSi alloy based on pulsed electromagnetic solidification of the present invention, the aluminum-lanthanum master alloy contains 90 wt% aluminum and 10 wt% lanthanum.

[0014] Furthermore, in the preparation method of the rare earth-containing AlMgSi alloy based on pulsed electromagnetic solidification of the present invention, the aluminum-titanium-boron master alloy contains 5 wt% titanium, 1 wt% boron, and the remainder is aluminum.

[0015] Furthermore, in the method for preparing rare-earth-containing AlMgSi alloys based on pulsed electromagnetic solidification of the present invention, the process parameters of the pulsed magnetic field treatment include:

[0016] The pulse frequency is 20~40Hz, the magnetic induction intensity is 100~200mT, the duty cycle is 20~40%, the current is 100~150A, and the processing time is 100~200 seconds.

[0017] Furthermore, in the preparation method of the rare-earth-containing AlMgSi alloy based on pulsed electromagnetic solidification of the present invention, the composition of the AlMgSi alloy includes:

[0018] 0.7-0.8 wt% magnesium, 0.7-0.8 wt% silicon, 0.4-0.8 wt% manganese, 0.01-0.03 wt% copper, 0.02-0.04 wt% zinc, 0.01-0.03 wt% titanium, 0.05-0.2 wt% lanthanum, 0.05-0.2 wt% cerium; the balance being aluminum and a maximum of 0.2 wt% impurities generated under manufacturing conditions.

[0019] Secondly, the present invention provides an AlMgSi alloy, which is prepared by the above-mentioned method for preparing rare earth AlMgSi alloy based on pulsed electromagnetic solidification; the precipitated phases of the AlMgSi alloy matrix are π-type α-AlFeSi and spherical AlFeSiMg or AlFeSiMn.

[0020] The AlMgSi alloy has a yield strength of 100~250MPa, a tensile strength of 100~250MPa, and an elongation of 4~10%.

[0021] Compared with the prior art, the beneficial effects of the AlMgSi alloy of the present invention are the same as those of the preparation method of rare earth AlMgSi alloy based on pulse electromagnetic solidification described in the above technical solution, and will not be repeated here. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0023] Figure 1 This is a metallographic morphology diagram of the AlMgSi alloy in Example 1 of the present invention;

[0024] Figure 2 This is a SEM image of the AlMgSi alloy from Example 1 of the present invention.

[0025] Figure 3 This is a metallographic morphology diagram of the AlMgSi alloy in Example 2 of the present invention;

[0026] Figure 4 This is a SEM image of the AlMgSi alloy from Example 2 of the present invention;

[0027] Figure 5 The image shows the metallographic morphology of the AlMgSi alloy in Comparative Example 1 of this invention.

[0028] Figure 6 This is a SEM image of the AlMgSi alloy of Comparative Example 1 of the present invention.

[0029] Figure 7 The image shows the metallographic morphology of the AlMgSi alloy in Comparative Example 2 of this invention.

[0030] Figure 8 This is a SEM image of the AlMgSi alloy of Comparative Example 2 of the present invention.

[0031] Figure 9 The image shows the metallographic morphology of the AlMgSi alloy of Comparative Example 3 of this invention.

[0032] Figure 10 This is a SEM image of the AlMgSi alloy of Comparative Example 3 of the present invention. Detailed Implementation

[0033] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0034] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0036] The AlMgSi alloys prepared by existing technologies have poor uniformity of precipitate distribution and low alloy microstructure refinement, which makes them unable to meet the requirements of high performance and high homogeneity.

[0037] To address the aforementioned technical problems, this invention provides a method for preparing rare-earth-containing AlMgSi alloys based on pulsed electromagnetic solidification, comprising:

[0038] Prepare the metal raw materials according to the composition and weight percentage of the AlMgSi alloy;

[0039] After the AlMgSi alloy raw material is smelted into molten aluminum, the molten aluminum is subjected to pulsed magnetic field treatment above the liquidus line, and then cooled to obtain the AlMgSi alloy; wherein:

[0040] The liquidus of the aluminum liquid is 740~760℃. During the pulsed magnetic field treatment, the aluminum liquid is controlled to contain 0.1wt% of lanthanum-cerium mixed rare earth, and the mass ratio of lanthanum to cerium in the lanthanum-cerium mixed rare earth is 1:(0.5~2).

[0041] After being treated with the pulsed magnetic field, the grain size of the AlMgSi alloy is 250~280μm, and the precipitated phases in the AlMgSi alloy matrix are π-type α-AlFeSi and spherical AlFeSiMg or AlFeSiMn.

[0042] In the above-described technical solution, the method for preparing rare-earth-containing AlMgSi alloy based on pulsed electromagnetic solidification of the present invention effectively refines the AlMgSi alloy grains and regulates the size, morphology, and distribution of precipitated phases by controlling the ratio of lanthanum and cerium mixed rare earths in the aluminum melt and by subjecting the aluminum melt to pulsed magnetic field treatment above the liquidus line. This results in AlMgSi alloy matrix precipitates being π-type α-AlFeSi and round AlFeSiMg or AlFeSiMn. Compared to the sharp, elongated β-AlFeSi phase in existing AlMgSi alloys, the aforementioned π-type α-AlFeSi and round AlFeSiMg or AlFeSiMn precipitates are significantly improved. LFeSiMg or AlFeSiMn can significantly improve the mechanical properties of AlMgSi alloys. Specifically, applying a pulsed magnetic field above the liquidus line of molten aluminum promotes the dispersion of lanthanum-cerium mixed rare earth elements in the melt through electromagnetic energy, which can fully improve the utilization rate of rare earth elements, maximize the performance potential of rare earth materials, reduce the number of sharp and elongated β-AlFeSi phases, and obtain π-type α-AlFeSi and round AlFeSiMg or AlFeSiMn precipitates. At the same time, it can significantly refine the solidification structure of the aluminum alloy, effectively improving the mechanical properties of the alloy and achieving a good balance of strength and toughness. Furthermore, this invention utilizes pulsed magnetic field technology to significantly reduce the energy barrier and nucleation critical radius of the high-temperature molten alloy under the action of a pulsed magnetic field, promoting the formation of a large number of atomic clusters, providing prerequisites for grain nucleation and homogenization, thereby obtaining fine equiaxed crystals. By promoting the dispersed distribution and uniform nucleation of rare earth elements and refining agents in molten aluminum using electromagnetic energy, a cluster nucleation effect can be created during solidification, which can fully improve the utilization rate of rare earth elements, maximize the potential of rare earth materials to control the size, morphology and distribution of precipitated phases, and avoid the precipitation of brittle rare earth phases. This allows for the development of new processes for refining highly homogeneous aluminum alloy grains, fully leveraging the advantages of rare earth purification, refining and strengthening of aluminum alloy materials. For example, the liquidus of the above-mentioned aluminum liquid can be 740℃, 750℃ or 760℃, and the mass ratio of lanthanum to cerium in the lanthanum-cerium mixed rare earth is 1:0.5, 1:1 or 1:2. Through the above-mentioned technical solution of the present invention, the technical problems of poor uniformity of precipitated phase distribution and low alloy microstructure refinement rate of AlMgSi alloys prepared by the prior art are solved, which makes it impossible to meet the requirements of high performance and high homogeneity.

[0043] In one possible implementation, in the method for preparing rare-earth-containing AlMgSi alloy based on pulsed electromagnetic solidification of the present invention, during the pulsed magnetic field treatment, the contents of the aluminum melt are controlled to be 0.05~0.2wt% lanthanum and 0.1~0.3wt% aluminum-titanium-boron master alloy by adjusting the contents of the aluminum lanthanum master alloy and aluminum-titanium-boron master alloy; after the pulsed magnetic field treatment, the grain size of the AlMgSi alloy is 150~160μm, and the AlMgSi alloy matrix contains π-type α-AlFeSi and spherical AlFeSiMg or AlFeSiMn precipitates.

[0044] By employing the above technical solution, and controlling the content of 0.05~0.2wt% lanthanum and 0.1~0.3wt% aluminum-titanium-boron master alloy in the molten aluminum, the pulsed magnetic field can promote the dispersed distribution and uniform nucleation of the lanthanum-aluminum master alloy and the aluminum-titanium-boron master alloy (i.e., AlTiB refining agent) in the melt or molten aluminum. This can significantly improve the utilization rate of rare earth elements, maximize the performance potential of rare earth materials, reduce the number of sharp, elongated β-AlFeSi phases, and obtain π-type α-AlFeSi and round AlFeSiMg or AlFeSiMn phases. The precipitation phase simultaneously refines the solidification structure of the aluminum alloy, effectively improving its mechanical properties and achieving a good balance between strength and toughness. For example, the lanthanum content in the molten aluminum can be 0.05wt%, 0.1wt%, or 0.2wt%, and the content of the aluminum-titanium-boron master alloy can be 0.1wt%, 0.2wt%, or 0.3wt%. For example, in the aluminum-lanthanum master alloy, the aluminum content can be 90wt%, the lanthanum content can be 10wt%, and in the aluminum-titanium-boron master alloy, the titanium content can be 5wt%, the boron content can be 1wt%, and the remainder is aluminum.

[0045] For example, in the preparation method of rare earth AlMgSi alloy based on pulsed electromagnetic solidification of the present invention, the process parameters of the pulsed magnetic field treatment include: pulse frequency of 20~40Hz, magnetic induction intensity of 100~200mT, duty cycle of 20~40%, current of 100~150A, and treatment time of 100~200 seconds; in another example, the pulse frequency can be 20Hz, 30Hz or 40Hz, the magnetic induction intensity can be 100mT, 150mT or 200mT, the duty cycle can be 20%, 30% or 40%, the current can be 100A, 125A or 150A, and the treatment time can be 100 seconds, 150 seconds or 200 seconds.

[0046] For example, in the method for preparing the rare-earth-containing AlMgSi alloy based on pulsed electromagnetic solidification of the present invention, the AlMgSi alloy comprises, by weight percentage: 0.7~0.8 wt% magnesium (Mg), 0.7~0.8 wt% silicon (Si), 0.4~0.8 wt% manganese (Mn), 0.01~0.03 wt% copper (Cu), 0.02~0.04 wt% zinc (Zn), 0.01~0.03 wt% titanium (Ti), 0.05~0.2 wt% lanthanum (La), and 0.05~0.2 wt% cerium (Ce); the balance being aluminum (Al) and a maximum of 0.2 wt% impurities generated under the manufacturing conditions; in another example, the AlMgSi alloy comprises: magnesium (Mg) containing... The amounts can be 0.7wt%, 0.75wt%, or 0.8wt%, with silicon (Si) content at 0.7wt%, 0.75wt%, or 0.8wt%, manganese (Mn) content at 0.4wt%, 0.6wt%, or 0.8wt%, copper (Cu) content at 0.01wt%, 0.02wt%, or 0.03wt%, zinc (Zn) content at 0.02wt%, 0.03wt%, or 0.04wt%, titanium (Ti) content at 0.01wt%, 0.02wt%, or 0.03wt%, lanthanum (La) content at 0.05wt%, 0.1wt%, or 0.2wt%, and cerium (Ce) content at 0.05wt%, 0.1wt%, or 0.2wt%.

[0047] To better understand the present invention, the following specific embodiments further illustrate the content of the present invention, but the content of the present invention is not limited to the following embodiments.

[0048] Unless otherwise specified, all raw materials used in the following examples are commercially available.

[0049] Example 1

[0050] This embodiment provides a method for preparing rare-earth-containing AlMgSi alloys based on pulsed electromagnetic solidification, including:

[0051] Step 1: Prepare the metal raw materials according to the composition and weight percentage of the AlMgSi alloy;

[0052] The metal raw materials in this embodiment include: 0.7 wt% Mg, 0.7 wt% Si, 0.4 wt% Mn, 0.01 wt% Cu, 0.02 wt% Zn, 0.01 wt% Ti, 0.05 wt% La, 0.05 wt% Ce, and the remainder is Al;

[0053] Step 2: Heat the aluminum ingot, Al-10La rare earth master alloy, 0.2wt% Al-5Ti-1B master alloy and the remaining raw materials to 750℃ until the alloy is completely melted to obtain molten aluminum, and place it in a crucible.

[0054] Step 3: Heat the crucible to 400℃ and subject the molten aluminum to a pulsed magnetic field treatment; specifically:

[0055] Turn on the electrical control cabinet and energize the electromagnetic coil. Set the output pulse frequency of the electrical control cabinet to 20Hz, the magnetic induction intensity to 150mT, the duty cycle to 20%, the current to 100A, and the processing time to 100 seconds.

[0056] Step 4: Pour the molten aluminum into a preheated crucible (preheating temperature is 400℃). After the crucible cools, demold and remove the ingot to obtain AlMgSi alloy.

[0057] Please see Figure 1 and Figure 2 , Figure 1 and Figure 2 These are the metallographic and SEM images of the AlMgSi alloy in this embodiment. From... Figure 1 and Figure 2 It can be seen that the AlMgSi alloy containing rare earth elements La, Ce and Al-Ti-B has equiaxed grains with an average grain size of 153 μm; π-shaped precipitates are uniformly dispersed at the grain boundaries; the AlMgSi alloy containing La, Ce and 0.2 wt% Al-5Ti-1B has a yield strength of 162 MPa, a tensile strength of 186 MPa and an elongation of 6.35%.

[0058] Example 2

[0059] This embodiment provides a method for preparing rare-earth-containing AlMgSi alloys based on pulsed electromagnetic solidification, including:

[0060] Step 1: Prepare the metal raw materials according to the composition and weight percentage of the AlMgSi alloy;

[0061] The metal raw materials in this embodiment include: 0.8 wt% Mg, 0.8 wt% Si, 0.8 wt% Mn, 0.03 wt% Cu, 0.04 wt% Zn, 0.03 wt% Ti, 0.05 wt% La, 0.05 wt% Ce, and the remainder is Al;

[0062] Step 2: Heat the aluminum ingot, Al-10La rare earth master alloy and the remaining raw materials to 750°C until the alloy is completely melted to obtain molten aluminum, and place it in a crucible;

[0063] Step 3: Heat the crucible to 400℃ and subject the molten aluminum to a pulsed magnetic field treatment; specifically:

[0064] Turn on the electrical control cabinet and energize the electromagnetic coil. Set the output pulse frequency of the electrical control cabinet to 30Hz, the magnetic induction intensity to 160mT, the duty cycle to 30%, the current to 200A, and the processing time to 200 seconds.

[0065] Step 4: Pour the molten aluminum into a preheated crucible (preheating temperature is 400℃). After the crucible cools, demold and remove the ingot to obtain AlMgSi alloy.

[0066] Please see Figure 3 and Figure 4 , Figure 3 and Figure 4 These are the metallographic and SEM images of the AlMgSi alloy in this embodiment. From... Figure 3 and Figure 4 It can be seen that the AlMgSi alloy containing rare earth elements La and Ce has equiaxed grains with an average grain size of 262 μm. A large number of round precipitates AlFeSiMg and AlFeSiMn are precipitated in the grains, and π-shaped α-AlFeSi is distributed at the grain boundaries. The yield strength of the AlMgSi alloy containing La and Ce is 137 MPa, the tensile strength is 153 MPa, and the elongation is 5.02%.

[0067] Example 3

[0068] This embodiment provides a method for preparing rare-earth-containing AlMgSi alloys based on pulsed electromagnetic solidification, including:

[0069] Step 1: Prepare the metal raw materials according to the composition and weight percentage of the AlMgSi alloy;

[0070] The metal raw materials in this embodiment include: 0.75 wt% Mg, 0.75 wt% Si, 0.6 wt% Mn, 0.02 wt% Cu, 0.03 wt% Zn, 0.02 wt% Ti, 0.05 wt% La, 0.05 wt% Ce, and the remainder is Al;

[0071] Step 2: Heat the aluminum ingot, Al-10La rare earth master alloy and the remaining raw materials to 750°C until the alloy is completely melted to obtain molten aluminum, and place it in a crucible;

[0072] Step 3: Heat the crucible to 400℃ and subject the molten aluminum to a pulsed magnetic field treatment; specifically:

[0073] Turn on the electrical control cabinet and energize the electromagnetic coil. Set the output pulse frequency of the electrical control cabinet to 20Hz, the magnetic induction intensity to 150mT, the duty cycle to 20%, the current to 100A, and the processing time to 100 seconds.

[0074] Step 4: Pour the molten aluminum into a preheated crucible (preheating temperature is 400℃). After the crucible cools, demold and remove the ingot to obtain AlMgSi alloy.

[0075] The AlMgSi alloy containing rare earth elements La and Ce prepared in this embodiment has equiaxed grains with an average grain size of 245 μm. A large number of circular precipitates AlFeSiMg and AlFeSiMn are precipitated within the grains, and π-shaped α-AlFeSi is distributed at the grain boundaries. The yield strength of the AlMgSi alloy containing La and Ce in this embodiment is 132 MPa, the tensile strength is 150 MPa, and the elongation is 5.25%.

[0076] Comparative Example 1

[0077] The preparation method of the rare earth AlMgSi alloy based on pulsed electromagnetic solidification provided in this comparative example is basically the same as that in Example 1. The difference is that in step 2 of this comparative example, Al-10La rare earth master alloy and Al-Ti-B master alloy are not added to the AlMgSi alloy, and it does not contain La and Ce.

[0078] Please see Figure 5 and Figure 6 , Figure 5 and Figure 6 The images show the metallographic and SEM images of the AlMgSi alloy used in this comparative example. Figure 5 and Figure 6 It can be seen that the AlMgSi alloy without any rare earth elements and grain refiners exhibits equiaxed grains with an average grain size of 295 μm; sharp and elongated precipitates β-AlFeSi are distributed at the grain boundaries in the aluminum matrix. Compared to the above examples, the mechanical properties of the AlMgSi alloy in this comparative example are significantly reduced; the AlMgSi alloy prepared in this comparative example has a yield strength of 122 MPa, a tensile strength of 131 MPa, and an elongation of 4.45%.

[0079] Comparative Example 2

[0080] The preparation method of rare earth AlMgSi alloy based on pulsed electromagnetic solidification provided in this comparative example is basically the same as that in Example 1. The difference is that the aluminum liquid in this comparative example is not treated with a pulsed magnetic field.

[0081] Please see Figure 7 and Figure 8 , Figure 7 and Figure 8 The images show the metallographic and SEM images of the AlMgSi alloy used in this comparative example. Figure 7 and Figure 8It can be seen that, without pulsed magnetic field treatment, the AlMgSi alloy containing rare earth elements and refining agents exhibits a rose-like grain structure with an average grain size of 317 μm; the π-shaped AlFeSi precipitates in the aluminum matrix are distributed at the grain boundaries. Compared to the above examples, the mechanical properties of the AlMgSi alloy in this comparative example are somewhat reduced; the yield strength of the AlMgSi alloy under these conditions is 113 MPa, the tensile strength is 127 MPa, and the elongation is 4.28%.

[0082] Comparative Example 3

[0083] The preparation method of the rare earth-containing AlMgSi alloy based on pulsed electromagnetic solidification provided in this comparative example is basically the same as that in Example 1. The difference is that no intermediate alloy (i.e., no rare earth elements) was added to the AlMgSi alloy in this comparative example, and the aluminum liquid was not treated with a pulsed magnetic field.

[0084] Please see Figure 9 and Figure 10 , Figure 9 and Figure 10 The images show the metallographic and SEM images of the AlMgSi alloy in Comparative Example 3. Figure 9 and Figure 10 As can be seen, the AlMgSi alloy grains are rose-shaped, with an average grain size of 382 μm; sharp and elongated precipitates β-AlFeSi are distributed at the grain boundaries in the aluminum matrix. Compared with the above examples, the mechanical properties of the AlMgSi alloy in this comparative example are significantly reduced. The AlMgSi alloy without any grain refiner has a yield strength of 86 MPa, a tensile strength of 101 MPa, and an elongation of 3.10% without pulsed magnetic field treatment.

[0085] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0086] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for the production of a rare earth containing AlMgSi alloy based on pulsed electromagnetic coagulation, characterized in that, The application relates to a preparation method of a rare earth-containing AlMgSi alloy based on pulse electromagnetic solidification. Metal raw materials are prepared according to the composition and weight percentage of the AlMgSi alloy; The composition of the AlMgSi alloy comprises 0.7-0.8 wt% of magnesium, 0.7-0.8 wt% of silicon, 0.4-0.8 wt% of manganese, 0.01-0.03 wt% of copper, 0.02-0.04 wt% of zinc, 0.01-0.03 wt% of titanium, 0.05-0.2 wt% of lanthanum and 0.05-0.2 wt% of cerium; the balance is aluminum and a total of up to 0.2 wt% of impurities generated under manufacturing conditions; After the metal raw materials of the AlMgSi alloy are smelted into aluminum liquid, pulse magnetic field treatment is conducted on the aluminum liquid above the liquidus of the aluminum liquid, and the AlMgSi alloy is obtained after cooling; wherein: The liquidus of the aluminum liquid is 740-760 DEG C, the process parameters of the pulse magnetic field treatment include that the pulse frequency is 20-40 Hz, the magnetic induction intensity is 100-200 mT, the duty cycle is 20-40%, the current is 100-150 A, and the treatment time is 100-200 seconds; during the pulse magnetic field treatment, the content of aluminum lanthanum intermediate alloy and aluminum titanium boron intermediate alloy is adjusted to control that the aluminum liquid contains 0.05-0.2 wt% of lanthanum and 0.1-0.3 wt% of aluminum titanium boron intermediate alloy; after the pulse magnetic field treatment, the grain size of the AlMgSi alloy is 150-160 mu m, and the precipitated phase of the AlMgSi alloy matrix is pi type alpha-AlFeSi and circular AlFeSiMg or AlFeSiMn; in the aluminum lanthanum intermediate alloy, the content of aluminum is 90 wt%, and the content of lanthanum is 10 wt%; in the aluminum titanium boron intermediate alloy, the content of titanium is 5 wt%, the content of boron is 1 wt%, and the balance is aluminum.

2. An AlMgSi alloy, characterized in that The AlMgSi alloy is prepared by the preparation method of the rare earth-containing AlMgSi alloy based on pulse electromagnetic solidification; The yield strength of the AlMgSi alloy is 100-250 MPa, the tensile strength is 100-250 MPa, and the elongation is 4-10%.

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