Aluminum alloy material for new energy vehicle frame and preparation method thereof

Abstract

The application discloses a new energy automobile framework aluminum alloy material and a preparation method thereof. The new energy automobile framework aluminum alloy material comprises the following components in mass percentage: Mn 0.2-0.5%, Si 0.2-2.0%, Fe 0.2-0.35%, Zn 1.5-2.5%, Cu 0.5-1.5%, Mg 2.0-4.0%, B 0.05-0.1%, Ti 0.05-0.15%, Y 0.1-0.3%, and the balance of Al and inevitable impurities. The new energy automobile framework aluminum alloy material has high strength, good die-casting performance, excellent wear resistance and corrosion resistance, and the new energy automobile framework prepared from the aluminum alloy material can meet the structural strength of a vehicle body.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy materials technology, and in particular to an aluminum alloy material for the frame of new energy vehicles and its preparation method. Background Technology

[0002] New energy vehicles refer to automobiles that use unconventional vehicle fuels as their power source and integrate advanced technologies in vehicle power control and drive, resulting in vehicles with advanced technical principles and new technologies and structures. New energy vehicles include pure electric vehicles and hybrid electric vehicles. Currently, the main themes of new energy vehicle frame material technology development are lightweighting, high performance, safety, and environmental protection and energy conservation. Traditional automobile body designs use steel plates as materials, mostly welded from stamped sheets. Compared to traditional automobiles, new energy vehicles have a more urgent need for lightweighting technology.

[0003] When aluminum alloy components are used as the frame of new energy vehicles, failure to meet high mechanical performance requirements will affect the structural strength of the entire vehicle body. Therefore, developing an aluminum alloy material for new energy vehicle frames that possesses high strength, good die-casting properties, and excellent wear and corrosion resistance is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing an aluminum alloy material for the frame of new energy vehicles and its preparation method.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] The first aspect of this invention is to provide an aluminum alloy material for the frame of a new energy vehicle, comprising the following components by mass percentage: Mn 0.2-0.5%, Si 0.2-2.0%, Fe 0.2-0.35%, Zn 1.5-2.5%, Cu 0.5-1.5%, Mg 2.0-4.0%, B 0.05-0.1%, Ti 0.05-0.15%, Y 0.1-0.3%, with the balance being Al and unavoidable impurities.

[0007] Furthermore, the aluminum alloy material for the new energy vehicle frame comprises the following components by mass percentage: Mn 0.4-0.5%, Si 1.5-2.0%, Fe 0.2-0.25%, Zn 1.5-2.0%, Cu 0.5-1.0%, Mg 3.0-4.0%, B 0.08-0.1%, Ti 0.1-0.15%, Y 0.1-0.2%, with the balance being Al and unavoidable impurities.

[0008] Furthermore, the weight ratio of Mg to Si is below 1.65.

[0009] The second aspect of this invention is to provide a method for preparing the above-mentioned aluminum alloy material for the frame of new energy vehicles, comprising the following steps:

[0010] Step 1: Add aluminum, magnesium, zinc, aluminum-copper alloy, aluminum-iron alloy, aluminum-silicon alloy, and aluminum-manganese alloy to the furnace and melt them completely at a melting temperature of 750-770℃, stirring thoroughly until homogeneous.

[0011] Step 2: Add slag remover and refining agent to remove impurity gases, then skim off the slag and let it stand.

[0012] Step 3: Add aluminum-titanium-boron alloy and magnesium-yttrium alloy, heat to 720-750℃, and after full melting, argon gas is introduced for refining, and slag is removed;

[0013] Step 4: Allow the mixture to cool to 680-690℃, then pour it to obtain the aluminum alloy material for the frame of the new energy vehicle.

[0014] Furthermore, the amount of the slag remover added is 0.4% of the mass of the melt obtained in step one, and the amount of the refining agent added is 0.35% of the mass of the melt obtained in step one.

[0015] Furthermore, the slag remover includes silicates; the refining agent is a sodium-free refining agent.

[0016] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0017] The aluminum alloy material for the frame of new energy vehicles of the present invention has high strength, good die-casting performance, and excellent wear resistance and corrosion resistance. The new energy vehicle frame made of the aluminum alloy material provided by the present invention can meet the structural strength requirements of the vehicle body. Detailed Implementation

[0018] The present invention will be further described below with reference to specific embodiments, but these are not intended to limit the invention. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other.

[0019] Example 1

[0020] This embodiment provides an aluminum alloy material for the frame of a new energy vehicle, comprising the following components by mass percentage: Mn 0.4%, Si 1.5%, Fe 0.2%, Zn 1.5%, Cu 0.5%, Mg 3.0%, B 0.08%, Ti 0.1%, Y 0.1%, with the balance being Al and unavoidable impurities.

[0021] Example 2

[0022] This embodiment provides an aluminum alloy material for the frame of a new energy vehicle, comprising the following components by mass percentage: Mn 0.5%, Si 2.0%, Fe 0.25%, Zn 2.0%, Cu 1.0%, Mg 4.0%, B 0.1%, Ti 0.15%, Y 0.2%, with the balance being Al and unavoidable impurities.

[0023] Example 3

[0024] This embodiment provides an aluminum alloy material for the frame of a new energy vehicle, comprising the following components by mass percentage: Mn 0.45%, Si 1.8%, Fe 0.22%, Zn 1.7%, Cu 0.8%, Mg 3.4%, B 0.09%, Ti 0.12%, Y 0.15%, with the balance being Al and unavoidable impurities.

[0025] Example 4

[0026] This embodiment provides an aluminum alloy material for the frame of a new energy vehicle, comprising the following components by mass percentage: Mn 0.42%, Si 1.7%, Fe 0.24%, Zn 1.6%, Cu 0.8%, Mg 3.6%, B 0.09%, Ti 0.14%, Y 0.13%, with the balance being Al and unavoidable impurities.

[0027] Example 5

[0028] This embodiment provides a method for preparing aluminum alloy materials for the frame of new energy vehicles, including the following steps:

[0029] Step 1: Add aluminum, magnesium, zinc, aluminum-copper alloy, aluminum-iron alloy, aluminum-silicon alloy, and aluminum-manganese alloy to the furnace and melt them completely at a melting temperature of 750℃, stirring thoroughly until homogeneous.

[0030] Step 2: Add a slag remover and a refining agent for removing impurity gases, then skim off the slag and allow the mixture to stand. The amount of slag remover added is 0.4% of the mass of the melt obtained in Step 1, and the amount of refining agent added is 0.35% of the mass of the melt obtained in Step 1. The slag remover includes silicates, and the refining agent is a sodium-free refining agent.

[0031] Step 3: Add aluminum-titanium-boron alloy and magnesium-yttrium alloy, heat to 740℃, and after full melting, argon gas is introduced for refining and slag removal.

[0032] Step 4: Allow the mixture to cool to 680°C, then pour it to obtain the aluminum alloy material for the frame of the new energy vehicle.

[0033] Using the above preparation method, aluminum alloy materials for new energy vehicle frames with the compositions described in Examples 1-4 were prepared respectively, and their tensile properties were tested. The results are shown in Table 1.

[0034] Table 1

[0035]

[0036]

[0037] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the content of the present invention specification should be included within the protection scope of the present invention.

Claims

1. An aluminum alloy material for the frame of a new energy vehicle, characterized in that, The composition includes the following components by mass percentage: Mn 0.5%, Si 2.0%, Fe 0.25%, Zn 2.0%, Cu 1.0%, Mg 4.0%, B 0.1%, Ti 0.15%, Y 0.2%, with the balance being Al and unavoidable impurities; The method for preparing the aluminum alloy material for the frame of the new energy vehicle includes the following steps: Step 1: Add aluminum, magnesium, zinc, aluminum-copper alloy, aluminum-iron alloy, aluminum-silicon alloy, and aluminum-manganese alloy to the furnace and melt them completely at a melting temperature of 750℃, stirring thoroughly until homogeneous. Step 2: Add a slag remover and a refining agent for removing impurity gases, then skim off the slag and allow the mixture to stand. The amount of slag remover added is 0.4% of the mass of the melt obtained in Step 1, and the amount of refining agent added is 0.35% of the mass of the melt obtained in Step 1. The slag remover includes silicates, and the refining agent is a sodium-free refining agent. Step 3: Add aluminum-titanium-boron alloy and magnesium-yttrium alloy, heat to 740℃, and after full melting, argon gas is introduced for refining, and slag is removed; Step 4: Allow the mixture to cool to 680°C, then pour it to obtain the aluminum alloy material for the frame of the new energy vehicle.

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