Review on Micro-Alloying and Preparation Method of 7xxx Series Aluminum Alloys: Progresses and Prospects

Abstract

Notably, 7xxx series aluminum alloy has become the most popular nonferrous alloy, extensively used in industry, construction and transportation trades, due to its high comprehensive properties such as high static strength, high strength, heat resistance, high toughness, damage resistance, low density, low quenching sensitivity and rich resource. The biggest challenge for aluminum alloy today is to greatly improve the corrosion resistance of the alloy, while maintaining its strength. The preparation method of 7xxx series aluminum alloy requires controlling time lapses in the process of heating, holding and cooling, and there are many species precipitates in the crystal, but the precipitated strengthening phase is a single type of equilibrium η′ phase. Therefore, more attention should be paid to how to increase the volume fraction of η′ precipitates and modify the comprehensive performance of the material and focus more on the microstructure of the precipitates. This article reviews the progress of 7xxx series aluminum alloy materials in micro-alloying, aging precipitation sequence, the strengthening-toughening mechanism and the preparation method. The effect of adding trace elements to the microstructure and properties of 7xxx series aluminum alloy and the problems existing in aging precipitation characteristics and the reinforcement mechanism are discussed. The future development direction of 7xxx series aluminum alloy is predicted by developing a method for the process-microstructure-property correlation of materials to explore the characteristic microstructure, micro-alloying, controlling alloy microstructure and optimizing heat-treatment technology.

Mechanical characteristics and crystallographic texture of AA5083 during Equal Channel Angular Pressing Technique

“…The simulation of the ECAP process, it was observed that the components experienced excessive skewing, necessitating an update to the mesh system. Remeshing criteria were established, with a 0.2 mm change in strain and a 1 mm element size selected as the criteria for remeshing [12]. In Figure 2, the ECAPed material was modeled using both strain hardenable rigid-plastic modes and isotropic linear elastic modes.…”

Influence of tool rotational speed on the microstructure and mechanical behavior of friction stir processed AA 7050 aluminum alloy

“…6 and Table 2). It must be mentioned that the precipitation sequence in the 7xxx al-loy is complicated and may contain simultaneously different metastable and stable phases such as θ, (η and η), (T and T) phases, or (S and S) phases depending on the Cu content and the Zn/Mg ratio [24].…”

Study on Effect of equal channel angular pressing on microstructure and properties of aluminum-magnesium-cerium alloy

“…In recent years, the micro-alloying of elements has gradually come into focus [1] .The addition of other elements to Al-Mg alloy to improve the properties of the alloy has been studied by domestic and foreign scholars, mainly focusing on trace elements such as Sc, Zr, etc [2][3][4][5] .However, the high price of Sc significantly increases production costs and is not conducive to price competition. The rare earth element Ce also achieves good performance improvements at a price advantage and is worth exploring for research purposes [6] .…”