The main characteristics and applications of magnesium alloys

(1) Magnesium alloy has a small specific gravity and is currently one of the lightweight structural materials. Its density ranges from 1.75 to 1.85g/cm3, which is about 64% of aluminum. The specific strength of 23% magnesium alloy in steel is significantly higher than that of aluminum alloy and steel, and slightly lower than that of fiber reinforced materials with higher specific strength; The specific stiffness is comparable to that of aluminum alloy and steel, but much higher than that of fiber reinforced materials, and has excellent performance. The specific elastic modulus is roughly the same as that of high-strength aluminum alloy and alloy steel.

(2) Good damping performance, suitable for preparing seismic resistant components. Magnesium alloy has a good damping coefficient, which is beneficial for shock absorption and noise reduction.

(3) Magnesium alloys have good castability and dimensional stability. The reactivity between magnesium and iron is very low, and the melting loss of the die-casting mold is reduced during die-casting, which increases the service life of the mold; Magnesium has a low thermal roasting rate per unit capacity, and its die-casting speed can be higher than that of aluminum. Magnesium castings have high casting and processing accuracy, allowing for high-speed mechanical processing, high production efficiency, and low cost, making them suitable for mass production in the automotive industry.

(4) The cutting performance is excellent, and its cutting speed is significantly higher than other metals. No grinding or polishing treatment is required, and machining surfaces with very low roughness can be obtained without the use of cutting fluid. In addition, magnesium alloys do not generate sparks on the surface when subjected to impact or friction.

(5) Magnesium alloy has good thermal conductivity, thermal stability, electromagnetic interference resistance, and shielding performance.

(6) Magnesium alloy can be recycled, with low recycling cost and high recycling rate.

(7) Due to the strong oxidation and combustion of magnesium in the liquid state, magnesium alloys need to be melted under solvent coverage or in a protective atmosphere. The solid solution treatment of magnesium alloy castings should also be carried out under the protection of SO2, CO2, or SF6 gas, or under vacuum. The solid solution treatment and aging treatment time of magnesium alloys are relatively long.

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