They are compared to the properties of tensile strength, fatigue strength, resistance to oxidation, manufacturing cost, density and elastic modulus:
1. Tensile Strength
Aluminium Alloy’s tensile strength is 230 Mpa, Magnesium Alloy is 220 Mpa. The same volume of magnesium alloy material is not as strong as aluminum alloy.
2. Fatigue Strength
In 5×108 cyc, Aluminium Alloy’s fatigue strength index is 80 Mpa, Magnesium Alloy is 60 Mpa.
3. Resistance to Oxidation
The oxidation resistance of aluminum alloy is higher than that of magnesium alloy.
4. Manufacturing Cost
Because magnesium alloy is active metal, manufacturing equipment and environment have higher requirements, resulting in high manufacturing cost.
The melting point of the magnesium alloy is lower than that of aluminum alloy. The tensile strength of magnesium alloy castings is similar to that of aluminum alloy castings, which can reach up to 250 Mpa and up to 600 Mpa. Yield strength, elongation and aluminum alloy are not very different.
