Since 1990, the application of magnesium in the automobile has been growing at a fast rate, automobile "magnesium" with an average annual growth rate of 20% of the rapid development of magnesium alloys has become an important area of automotive materials technology development.

 I. Advantages of magnesium alloy in automobile application

Compared with other metals, magnesium alloy has many performance characteristics:

① small density, such as AZ91 magnesium alloy density is 1.81g-cm-3, about 2/3 of aluminum, steel 1/4, close to the density of engineering plastics.

② Tensile strength, yield strength, elongation and aluminum alloy castings are comparable.

③ has good electromagnetic shielding properties, anti-radiation properties, can be high-precision machining, and good thermal conductivity, used in die-casting automobile wheels, can effectively disseminate the brake friction heat, improve braking stability;.

④ has good die-casting molding performance and dimensional stability, die casting wall thickness of up to 0.15 mm, suitable for manufacturing various types of automotive die castings; ⑤ has a good damping coefficient and dimensional stability.

⑤ has good damping coefficient, vibration damping performance is better than aluminum alloy and cast iron, used for shell can reduce noise, used for seats, wheels can reduce vibration, improve the safety and comfort of the car; ⑥ easy to recycle and regenerate.

(6) Easy to recycle and regenerate. Recycled magnesium alloy can be directly melted and then cast, and does not reduce its mechanical properties.

Relevant research conclusions: every 100kg reduction in automobile quality, fuel consumption per 100 kilometers can be reduced by 0.7L, every 10% reduction in automobile weight, fuel efficiency can be improved by 5.5%. The energy crisis is becoming more and more serious, environmental protection regulations are becoming more and more strict, so that the modern automobile weight reduction and energy saving requirements continue to rise, lightweight has become the main development direction of the automobile material selection. Magnesium alloy has become the material of automobile lightweight, and its development and application have been paid attention to by various countries.

Second, has been applied in the automobile magnesium alloy die castings

With the "magnesium alloy application development and industrialization" project in-depth implementation, the automobile industry in this project has benefited a lot, the effect is obvious, many enterprises have made considerable progress. At present, the magnesium alloy materials have been developed and applied to the following auto parts:

In-vehicle components: instrument panel, seat frame, steering wheel, steering column, steering column bracket, seat lifter, console frame, airbag cover, locking device cover, radio shell, small toolbox door, window motor cover, brake and clutch pedal bracket, pneumatic bracket pedals and so on.

Body components: door frame, tailgate, roof frame, roof panel, IP cross member, etc.

Engine and transmission system: valve cover, cam cover, four-wheel drive transmission body, manual shift transmission, clutch housing piston, air intake pipe, oil pan, AC motor bracket, transmission housing, gear box housing, oil filter connector, motor cover, cylinder head cover, distributor plate bracket, oil pump housing, oil tank, oil filter bracket, left half crankcase, right half crankcase, air cover, left suction pipe, right suction pipe, etc. air ducts, right air ducts, etc.

Chassis: wheels, engine bracket, front and rear booms, tailgate bracket.

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