Improved Al-Mg-Si alloy and profile

Abstract

The invention belongs to the technical field of alloy materials, and particularly relates to an improved Al-Mg-Si alloy and a profile. The Mg / Si ratio is within 1.4-2.0, and other alloying elements are added. Therefore, good mechanical, crushing and corrosion resistance performance can be achieved; the requirements of structural aluminum profiles for automobiles and passenger vehicles are satisfied; the production process range is wider; and products with better crushing energy absorption can be obtained. The whole alloy is good in strength, and good in behavior during an axial fracturing test of a hollow section (only a small number of cracks are allowed), and Rp0.2 > 265 MPa after 1000 hours at the temperature of 150 DEG C.

Description

[0001] field of invention [0002] The invention relates to an improved Al-Mg-Si alloy and a profile, belonging to the technical field of alloy materials. Background technique [0003] Aluminum structural profiles for automobile bodies need to meet sufficient strength requirements. At the same time, when a passenger car collides, it needs to absorb the collision energy, so as to protect the left and right of the occupants. Currently, it meets high strength, and the aluminum parts are exposed to corrosion. Environment, high temperature (when used in or close to the engine) vehicle front structure requires alloys of the type mentioned above, and the alloy needs high strength and good fracturing properties at the same time, the crushing performance required by the high pressure crushing Alloys, represented by the aluminum alloy developed by HYDRO, need to strictly control the Mg / Si ratio within the range of 0.9-1.3. The actual production process range is very narrow. To meet the ...

AI Technical Summary

Problems solved by technology

[0003] Aluminum structural profiles for automobile bodies need to meet sufficient strength requirements. At the same time, when a passenger car collides, it needs to absorb the collision energy, so as to protect the left and right of the occupants. Currently, it meets high strength, and the aluminum parts are exposed to corrosion. Environment, high temperature (when used in or close to the engine) vehicle front structure requires alloys of the type mentioned above, and the alloy needs high strength and good fracturing properties at the same time, the crushing performance required by the high pressure crushing Alloys, represented by the aluminum alloy developed by HYDRO, need to strictly control the Mg / Si ratio within the range of 0.9-1.3. The actual production process range is very narrow. To meet the final strength performance, the requirements for the homogeneous process of cast rods are also very strict. However, in the prior art, the Al-Mg-Si alloy with increased Mg / Si ratio has poor crush performance and affects the overall quality of the product, so it needs to be improved