Rapid extrusion aluminum alloy section with low rare earth content and preparation process thereof

Abstract

The invention discloses a rapid extrusion aluminum alloy profile with low rare earth content and a preparation process thereof, and belongs to the technical field of metal materials. The aluminum alloy comprises the following components in percentage by weight: 0.8 to 1.2 percent of Mg, 0.7 to 1.2 percent of Si, 0.5 to 0.6 percent of Cu, 0.2 to 0.8 percent of Sc, 0.2 to 0.5 percent of Zr and the balance of aluminum. A trace or a small amount of rare earth element (Sc) is added into the aluminum alloy, so that the alloy cost is effectively reduced. The extrusion speed is higher than 5m / min, the extrusion production efficiency is high, the cost of the extrusion material is reduced, the surface of the obtained extrusion material is smooth and free of surface cracks, and the yield of the extrusion material is guaranteed; meanwhile, the obtained extruded material also possibly has a weak basal texture or a weak non-basal texture; and the room-temperature elongation of the extruded material can be greater than or equal to 8% through optimized components. Therefore, the method has good application and popularization prospects and can be applied to the low-cost civil fields such as electric buses and rail transit.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a rapid extrusion aluminum alloy profile with low rare earth content and a preparation process thereof. Background technique [0002] As a lightweight metal structural material, aluminum alloy has a series of advantages such as high specific strength and specific stiffness, excellent thermal conductivity and electrical conductivity, good electromagnetic shielding performance, and recyclability. It is known as "21st century green structural material". In recent years, the rapid development of the automobile industry and the enhancement of people's awareness of automobile energy saving, safety and environmental protection have made aluminum alloys attract more and more attention in the field of transportation such as automobiles. However, due to the close-packed hexagonal crystal structure of aluminum alloy, its plastic workability is poor, which limits its large-scale appl...

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Problems solved by technology

[0004] For the current commercial aluminum alloys (such as Al-Mg series and Al-Mg-Si series alloys) and existing patent reports, the extrusion speed of the extruded material is low, and the room temperature plasticity of the extruded material is poor, resulting in high production and application costs. Problem, the present invention provides a low-rare-earth content rapid extrusion aluminum alloy profile and its preparation process. The extruded material is produced by an extrusion process with a speed of not less than 5m / min. The surface of the obtained extruded material is smooth without any surface cracks , while the extruded material has weak basal texture or weak non-basal texture, the optimized composition can make the room temperature elongation of the extruded material ≥ 9%

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