Magnesium alloy is one of the main materials for lightweight automobiles
According to calculations, for every 100kg reduction in vehicle weight, fuel consumption per 100 kilometers can be reduced by 0.7 liters, and for every 10% reduction in vehicle deadweight, vehicle fuel efficiency can be improved by 5.5%; for new energy vehicles, every 10% reduction in body weight corresponds to a cruising range. Mileage can be increased by about 14%. The importance of lightweight in the modern automotive industry is self-evident.
Generally speaking, there are two main ways to reduce the weight of automobiles. One is to replace steel, aluminum alloy, etc. with new materials with lower density;
In terms of new material applications, magnesium alloys are considered to be one of the most promising materials under the wave of automotive lightweighting, because the density of magnesium alloys is very low, only 1.7, which is the lowest density among all structural parts or auto parts. In comparison, the density of aluminum is 2.8, and the density of steel is 7.8. Such low-density characteristics make magnesium alloys extremely advantageous in the lightweight of automobiles. For example, the casing weight of an automobile gearbox using magnesium alloy is about 5.4 kg, but if it is made of aluminum alloy, it generally exceeds 12 kg, which can reduce the weight by 58%. If the power system, frame, suspension, and interior parts of the car, inner door panels, seat brackets, brake systems, steering systems and other components are widely used in magnesium alloys, the weight should be at least 30% or more.
More importantly, magnesium alloys also have advantages in strength and shock absorption, and can withstand higher loads. In addition, magnesium alloys are excellent in corrosion resistance, shock absorption, impact resistance, electromagnetic wave shielding, and mechanical properties. It is very excellent, so it is known as “the green engineering material with the most development potential in the 21st century”. In addition, the advantage of magnesium lies in its abundant reserves, accounting for 2.7% of the earth’s crust, and its mining life is 20 and 4 times that of iron and aluminum respectively. Among them, China occupies 70% of the world’s magnesium reserves, and China’s dolomite reserves have exceeded 7 billion tons. Dolomite is the basic raw material for making magnesium alloys.