Introduction to The Types and Performance of Aluminum Die Casting
What are the types of aluminum die casting?
1. Al-Mg alloy
The performance characteristics of Al-Mg aluminum alloy are: good mechanical properties at room temperature; strong corrosion resistance; poor casting performance, large fluctuations in mechanical properties and greater wall thickness effects; long-term use, due to aging effects, the alloy has plasticity Decrease, and even die-casting parts crack; die-casting parts have a greater tendency to produce stress corrosion cracking. The shortcomings of Al-Mg alloy partially offset its advantages, and its application is subject to certain restrictions.
2. Al-Zn alloy
After natural aging, Al-Zn aluminum alloy die castings can obtain higher mechanical properties. When the mass fraction of zinc is greater than 10%, the strength is significantly improved. The disadvantages of this alloy are poor corrosion resistance, stress corrosion tendency, and easy thermal cracking during die casting. The commonly used Y401 alloy has good fluidity and is easy to fill the cavity. The disadvantage is that it has a high tendency to form pores. When the content of silicon and iron is small, it is easy to thermally crack.
3. Al-Si alloy
Because Al-Si aluminum alloy has the characteristics of small crystallization temperature interval, large solidification latent heat of silicon phase in the alloy, large specific heat capacity, and relatively small linear shrinkage coefficient, its casting performance is generally better than other aluminum alloys. Its filling ability is also good, and the tendency of thermal cracking and shrinkage is relatively small. The number of brittle phases (silicon phases) contained in Al-Si eutectic is the smallest, and the mass fraction is only about 10%. Therefore, its plasticity is better than other aluminum alloy eutectics. The only remaining brittle phases can be further modified by modification. Improve plasticity.
Because Al-Si eutectic has good plasticity and can better meet the requirements of both mechanical properties and casting performance, Al-Si alloy is currently the most widely used die-cast aluminum alloy.
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