High-strength, high-ductility rare earth aluminum alloy material and method of producing the same

Abstract

The invention relates to a rare earth aluminium alloy material with high strength and high toughness and the preparation method thereof, belonging to the technical field of metal alloy and the preparation thereof. The invention is characterized in that the invention comprises Mg, Si, Fe, a rare earth compound additive and Al, with the weight percentages as follows: Mg: 0.50-0.60%; Si: 0.35-0.45%; Fe less than or equal to 0.35%; rare earth additive less than or equal to 0.065-0.2%; the margin being Al. The preparation method comprises charging and melting down the 6063 aluminum alloy furnace materials in accordance with the conventional methods, adjusting the furnace temperature, deairing, refining and purifying the melt and then adding Al-RE, Al-Sr and Al-Zr master alloys at the temperature between 720 DEG C and 760 DEG C and preserving heat for 30min-7h, then carrying out homogenization treatment on electromagnetic stirring components and detection, pouring and casting, finally carrying out homogenization treatment and subsequent quick cooling treatment, rapid heating before extrusion, extrusion and on-line quenching treatment as well as artificial aging treatment. The product section obtained from the invention has rapid extrusion and high mechanical property of the section and can improve the apparent mass of the section and increase the modification of oxide film density.

Description

technical field [0001] The invention relates to a high-strength, high-toughness rare earth aluminum alloy material and a preparation method thereof, and belongs to the technical field of metal alloys and their preparation. Background technique [0002] 6063 aluminum alloy profile has become the most popular aluminum alloy building material in the world and at home. In order to increase productivity, reduce energy consumption, improve extrusion processability, improve the mechanical properties and chemical and physical properties of extrusion profiles, international and domestic aluminum processing plants have carried out extensive research on alloying technology and processing technology. [0003] The national standard GB3190 stipulates that the composition of 6063 aluminum alloy is Mg: 0.45%-0.90%; Si0.2%-0.6%; Fe≤0.35%. Obviously, the distribution space of alloying elements is very large, and the different values ​​of alloying elements will have a great impact on the comp...

AI Technical Summary

Problems solved by technology

[0004] A modified 6063 aluminum alloy disclosed in Chinese patent CN1456697A has a maximum tensile strength of 216MPa and an elongation of 17%; a large amount of mixed rare earths is added, reaching 0.11-0.2%, far exceeding the limit solubility of rare earths of about 0.05%. It is difficult to homogenize the components in industrialized large melting furnaces such as 15 tons and 25 tons, and it is easy to cause segregation, so that the effect of rare earths cannot be fully exerted, resulting in deterioration of extrusion processability and low mechanical properties of extrusion products; at the same time It is also easy to chemically react with the added Ti and Zr refiners, resulting in a coarse structure of the aluminum matrix, and the excellent effects of both cannot be fully exerted.

However, the single addition of rare earth, zirconium and strontium cannot take into account the overall performance, and a comprehensive optimization design is required to meet various performance requirements