Introduction to the Characteristics of Magnesium Alloy Products

Its processing process, corrosion, and mechanical properties have many characteristics: fast heat dissipation, light weight, good rigidity, certain corrosion resistance and dimensional stability, impact resistance, wear resistance, good attenuation performance, and easy recycling; In addition, it has high thermal and conductive properties, no magnetism, good shielding, and non-toxic characteristics.

Application scope: Magnesium alloy is widely used in portable devices and the automotive industry, achieving the goal of lightweight.

Although the specific gravity of magnesium alloy is heavier than that of plastic, its strength and elasticity per unit weight are higher than that of plastic. Therefore, under the same strength of components, magnesium alloy components can be made thinner and lighter than plastic. In addition, due to the higher specific strength of magnesium alloy compared to aluminum alloy and iron, the weight of aluminum or iron components can be reduced without reducing the strength of the components.

Magnesium alloy has the highest relative strength (ratio of strength to mass). The specific stiffness (ratio of stiffness to mass) is close to that of aluminum alloy and steel, far higher than that of engineering plastics.

Within the elastic range, magnesium alloys absorb half the energy when subjected to impact loads compared to aluminum alloy components, so magnesium alloys have good seismic and noise reduction performance.

Magnesium alloy has a lower melting point than aluminum alloy and good die-casting forming performance. The tensile strength of magnesium alloy castings is comparable to that of aluminum alloy castings, generally reaching up to 250MPA and up to over 600 Mpa. The yield strength and elongation are not significantly different from aluminum alloys.

Magnesium alloy also has good corrosion resistance, electromagnetic shielding performance, and radiation resistance, which can achieve 100%

Magnesium alloy castings 2

Magnesium alloy castings 2

Recycling and reuse.

Magnesium alloy parts have higher stability compared to high-pressure castings, and the dimensional accuracy of the casting process is high, allowing for high-precision mechanical processing.

Magnesium alloy has good die-casting forming performance, and the minimum wall thickness of die-casting parts can reach 0.5mm. Suitable for manufacturing various types of automotive die castings.

But the linear expansion coefficient of magnesium alloy is very large, reaching 25-26 μ M/m ℃, while aluminum alloy is 23 μ M/m ℃, brass approximately 20 μ M/m ℃, structural steel 12 μ M/m ℃, cast iron about 10 μ M/m ℃, rock (granite, marble, etc.) is only 5-9 μ M/m ℃, glass 5-11 μ M/m ℃.

Magnesium alloy is an alloy based on magnesium and composed of other elements. Its characteristics are: low density, high specific strength, high elastic modulus, good shock absorption, greater ability to withstand impact loads than aluminum alloy, and good corrosion resistance. The main alloying elements include aluminum, zinc, manganese, cerium, thorium, and a small amount of zirconium or cadmium. At present, the most widely used is magnesium aluminum alloy, followed by magnesium manganese alloy and magnesium zinc zirconium alloy.

Magnesium alloy has the lightest specific gravity among all structural alloys, so it can reduce the weight of aluminum or iron components without reducing the strength of the components. The specific strength of magnesium alloy is significantly higher than that of aluminum alloy and steel, and the specific stiffness is equivalent to that of aluminum alloy and steel. Within the elastic range, magnesium alloys absorb more energy when subjected to impact loads than aluminum alloy components, so magnesium alloys have good seismic and noise reduction performance. Under the same load, the damping performance is 100 times that of aluminum and 300-500 times that of titanium alloy. Excellent electromagnetic shielding, the outer shell of 3C products (mobile phones and computers) should be able to provide superior electromagnetic protection, while the magnesium alloy outer shell can fully absorb electromagnetic interference with frequencies exceeding 100db. Excellent texture, the appearance and touch texture of magnesium alloy are excellent, making the product more luxurious and less prone to corrosion in the air.

Magnesium alloys have absolute advantages in heat dissipation compared to alloys: according to the formula: Q=dvC △ t, where Q - heat; D=specific gravity; V=volume; C=Ratio

magnesium alloy

Heat capacity; △ t=the temperature at which (t1-t2) changes; When magnesium and aluminum alloys of the same volume and shape receive the same heat Q, the temperature ratio of the two changes is: △ t/△ t=2.74x0.23/1.81x1.05=1/3; Magnesium alloy is one-third of aluminum alloy; The thermal conductivity of magnesium alloy is 54W/mk; The thermal conductivity of aluminum alloy is 100W/mk; The difference is double. For radiators made of magnesium alloy and aluminum alloy materials of the same volume and shape, the heat (temperature) produced by a certain heat source is more easily transferred from the root of the heat sink to the top by magnesium alloy compared to aluminum alloy, and the top is easier to reach high temperature. The temperature difference between the root and top of aluminum alloy radiators is smaller than that of magnesium alloy radiators. This means that the temperature difference between the air at the root and the air at the top of the heat sink made of magnesium alloy material is larger than that of the heat sink made of aluminum alloy material, thus accelerating the diffusion and convection of air inside the heat sink and improving the heat dissipation efficiency. Therefore, at the same temperature, the heat dissipation time of magnesium alloy does not need half that of aluminum alloy.

Therefore, magnesium alloy is an ideal material for applications in LED and other lighting, automotive components, and other components that require high quality, strength, and toughness.