Al-Mg alloys refer to cast aluminum alloys with magnesium as the main alloying element. Magnesium content ranges from 0.5-13%.
According to the chemical composition, it can be divided into：
Al-Mg one-element alloys and Al-Mg-Zn, Al-Mg-Si and other multi-element alloys.
Disadvantages of Al-Mg alloy:
The solubility of magnesium in aluminum is large, and the atomic radius of the two is very different, the strengthening effect is remarkable, and the comprehensive properties (tensile strength, elongation, impact toughness, etc.) are good, but after natural aging or artificial aging, the supersaturated solid solution decomposes Coarse brittle (BAl2Mg) phase particles are formed, and the precipitation along the grain boundary will deteriorate the mechanical properties and corrosion resistance of the alloy. Especially alloys with high magnesium content tend to “become brittle” after long-term use. Therefore, the use of Al-Mg binary alloys is limited.
Solution :
Adding Zn, Mn, Zr, Mo and other elements can inhibit its natural aging tendency and improve the stability of mechanical properties. Beryllium is used to prevent oxidation, and titanium is added as a grain refinement element. Adding silicon can improve the casting process performance, and form a skeleton-like Mg2Si distribution on the grain boundary to improve the thermal strength of the alloy. Suitable for sand casting, metal casting and pressure casting.
Advantages of Al-Mg Alloy:
The Al-Mg series alloy has excellent corrosion resistance, cutting performance, polishing performance and electroplating performance, and has a low density.
application of Al-Mg Alloy:
Widely used in sectors such as shipbuilding, food industry and chemical industry