The addition of various elements in the deformed aluminum alloy will cause physical and chemical interaction between them in the metallurgical process, thereby changing the structure and phase composition of the material, obtaining new materials with different properties, functions and uses, and alloying the deformed aluminum alloy material. The metallurgical properties play an important role. The effects of alloying elements on the microstructure and properties of the alloy are described below.
Copper is an important alloying element and has a certain solid solution strengthening effect. In addition, the copper aluminide which is precipitated by aging has obvious aging strengthening effect. The copper content in aluminum alloy is usually 2.5%~6.8%, and the copper content is 4%~ The 6.8% strengthening effect is the best, so the copper content of most hard aluminum alloys is in this range.
At a eutectic temperature of 577 degrees Celsius, the maximum solubility of silicon in a solid solution is 1.65%. Although the solubility decreases with a decrease in stability, such alloys are generally intensified without heat treatment. Aluminum alloys have excellent casting properties and corrosion resistance.
Magnesium silicon is simultaneously added to the aluminum alloy to form an aluminum-magnesium-silicon series alloy. The strengthening phase is magnesium silicide. The mass ratio of silicon to magnesium is 1.68:1. When the AL-MG-SI alloy composition is designed, the contents of magnesium and silicon are basically set in this ratio. Some AL-MG-SI alloys, in order to improve the strength, rabbits with the right amount of copper, while adding a small amount of chromium to offset the adverse effects of copper against corrosion.
The solubility of magnesium in aluminum decreases rapidly with the decrease of temperature. In most industrially deformed aluminum alloys, the content of magnesium is less than 6%, and the content of silicon is also low. Such aluminum alloy can not be treated and strengthened. Good sex, and moderately advanced.
The strengthening of magnesium by aluminum is obvious. The tensile strength of magnesium is not increased by about 1%. If the manganese is added by 1%, the strengthening effect can be enhanced. Therefore, the manganese content can be reduced and the thermal tendency can be reduced. In addition, manganese can also uniformly precipitate the compound to improve corrosion resistance and weldability.
At the eutectic temperature of 658 ° C, the maximum solubility of manganese in solid solution weight is 1.82%, the strength of the alloy increases with the increase of solubility, and the elongation reaches the maximum value when the manganese content is 0.8%. The AL-MN alloy is a non-age hardening alloy that is not heat treatable. Manganese is an important element in aluminum alloys and can be added separately to form AL-MN binary alloys. More of the other alloying elements are added at the same time, so most of the aluminum alloys are military aviation manganese.
Zinc is added to aluminum alone, and the strength of the aluminum alloy is very limited under deformation conditions, and there is stress corrosion cracking. This limits the amount of application. At the same time, the addition of magnesium and zinc elements, the proportion of the adjustment period, the stress corrosion cracking resistance is the largest.
If the copper element is added to the AL-ZN-MG to form an AL-zn-mg-cu alloy, the strengthening effect is the largest among all aluminum alloys. They are also important aluminum alloy materials in the aerospace, aviation industry and power industry.
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