High performance Al-Mg-Si aluminum alloy extrusion material and preparation method thereof

Abstract

The invention belongs to the technical field of aluminum alloy materials, and relates to a high performance Al-Mg-Si aluminum alloy extrusion material and a preparation method thereof. The high performance Al-Mg-Si aluminum alloy extrusion material is prepared from the following element components in percent by weight: 0.4-0.7% of Si, 0.5-0.7% of Mg, 0.01-0.2% of Cu, 0.05-0.45% of Mn, 0.01-0.3% ofCr, 0.01-0.02% of Ti, 0.05-0.30% of rare earth elements, less than or equal to 0.1% of Zn, less than or equal to 0.15% of Fe and the balance Al, wherein the content of single elements is less than orequal to 0.05%, the total content of impurities is less than or equal to 0.15%, and any one or two of the rare earth elements Er and Sc are mixed. The preparation method can optimize the alloy components obviously, balance and refine crystal grains, purify and clean a melt, reduce the casting flaws and improve the quality of a cast ingot greatly. In addition, the surface quality of an extruded profile can be better improved, and the extrusion speed and the thermal treatment comprehensive mechanical property of the extruded profile product are improved.

Description

technical field

[0001] The invention belongs to the technical field of aluminum alloy materials, and relates to a high-performance rare earth Al-Mg-Si aluminum alloy extruded material and a preparation method thereof. Background technique

[0002] With the increase in the demand for aluminum alloy extrusion profiles in high-end technical fields such as national defense and military industry, rail transit, and aerospace, higher requirements are also put forward for its performance. The requirements for high speed, safety, energy saving, comfort, and environmental protection put forward by rail transit and vehicles are one of the major issues facing the domestic modernization drive. Al-Mg-Si aluminum alloy has been widely used in the manufacture of rail transit and vehicles because of its medium strength, good weldability and extrusion formability, especially it can extrude different thickness and thin walls with complex cross-sectional shapes Hollow profiles. At present, va...

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