- Improves the main impact of liquidity and the thermal expansion and wear resistance of castings; but crystallized silicon (Si) can easily form hard points, thus reducing machinability. Therefore, it is generally maintained below the eutectic point.
- Improves the mechanical property, castings strength and machinability, but reduces corrosion resistance.
- The corrosion resistance of aluminum magnesium is the best, such as ADC5, ADC6; with large solidification shrinkage ratio and hot shortness, which can cause cracks in castings and difficulty of casting; molten aluminum can also be easily oxidized.
- An appropriate proportion of Fe can increase mold release. If the content is less than 0.7%, demolding becomes harder. Excess Fe may however cause segregation and larger grain size.
- Improves the high-temperature strength of copper (Cu) and silicon-containing (Si) alloy, and inhibits the elemental change of iron (Fe), reducing its harmful effects.
- Increases the tensile strength and hardness, and improves heat resistance, but the corrosion resistance and thermal conductivity may be reduced
- It can enhance machinability when combined with magnesium (Mg), but the disadvantages include a reduction in corrosion resistance and toughness.
- A trace amount of titanium (Ti) in the alloy has a refining effect which improves mechanical performance and increases strength, but also reduces conductivity.
- Has an extremely low solid solubility in molten aluminum, and poor fluidity. It can easily cause pores to form in the castings.
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