Die casting aluminum alloy has good performance and process performance. Therefore, aluminum alloy die casting is developing rapidly, and it has been widely applied in various industrial sectors. Its consumption is much higher than that of other non-ferrous alloys, and plays an extremely important role in die casting production.
Aluminum Alloy for Al Si alloy, Al Cu alloy, Al Mg alloy, alloy AlZn.
1, Al Si alloy
The eutectic Al Si alloy with the crystallization temperature interval and silicon in the alloy phase has great latent heat and high heat capacity, the shrinkage factor is relatively small, so the general casting performance than other Aluminum Alloy good, the filling performance or thermal cracking and shrinkage is relatively small.
2, Al Mg alloy
The performance characteristics of Al Mg alloy: the room temperature mechanical properties; corrosion resistance; casting performance is poor; the fluctuation and wall thickness effect mechanical properties are relatively large; long-term use, is because of the aging effect and the plasticity of the alloy decreases, even casting cracking phenomenon; die casting should be produced tendency of stress corrosion cracking are also larger.
3, AlZn alloy
AlZn alloy casting by natural aging, can obtain high mechanical properties. When the mass fraction of zinc is greater than 10%, the strength increases significantly. The defects of this alloy are poor corrosion resistance, stress corrosion tendency, and hot cracking during die-casting.
4. Die-casting aluminum alloy with special properties
The special properties of die-casting aluminum alloy developed at home and abroad are as follows:
Decorative type: suitable for Al Mn alloy anodizing and coloring, high elongation, corrosion resistance also has considerable. But its strength is not high, the shrinkage rate is large, and it is easy to stick to the mold.
Heat treatment: quenching type AlSiCu alloy after incomplete quenching after artificial aging and artificial aging completely to the maximum hardness.
In addition, Al Mn Zn alloy, wear-resistant hypereutectic Al Si alloy and anti vibration anti vibration Al Zn alloy are also used for surface treatment and heat treatment.
There are also die-casting aluminum alloy composites, which have not been widely produced and applied at present.