I. Introduction

II. Characteristics of Aluminum Alloys

1. Low Density and High Strength: The density of aluminum alloys is approximately 2.7 - 2.9 g/cm³, which is much lower than that of steel. After alloying and heat treatment, the tensile strength can exceed 500 MPa, and some high-strength aluminum alloys can even reach more than 700 MPa, meeting mechanical requirements.
2. Excellent Corrosion Resistance: The aluminum oxide film on the surface isolates from corrosion. In chlorine-containing environments such as the marine environment, the corrosion rate is much lower than that of carbon steel, ensuring long-term service stability.
3. Good Thermal and Electrical Conductivity: The thermal conductivity is 100 - 200 W/(m·K), several times that of steel. The electrical conductivity is also good, making it suitable for parts related to heat dissipation and power transmission.

III. Manufacturing Processes of Aluminum Alloy Parts

1. Die Casting: Liquid aluminum alloy is injected into the mold cavity at high pressure. It is suitable for producing complex, thin-walled parts in large quantities, such as automobile engine blocks. The production efficiency is high, but it is prone to porosity and requires subsequent treatment.
2. Machining: For parts with extremely high precision and special structures, such as aero-engine blades, CNC milling, turning, grinding and other methods are used for processing. The machining accuracy can reach the micrometer level, but the cost increases with the improvement of precision.
3. Forging: The aluminum alloy ingot billet is heated and then subjected to pressure to cause plastic deformation. It is often used to manufacture parts with large load-bearing requirements, such as aircraft landing gears. It can refine the grain structure and improve the performance, but the mold cost is high and the shape complexity is limited.

IV. Application Fields of Aluminum Alloy Parts

1. Aerospace: Aluminum alloys are widely used in aircraft fuselages, satellite components and so on. They reduce weight while maintaining strength, helping the aerospace exploration achieve lightweight.
2. Automotive: Aluminum alloys are widely used in engines, vehicle bodies, wheels and so on. The weight reduction of the whole vehicle improves fuel economy and handling performance.
3. Electronics: Radiators and shells of mobile phones and computers are mostly made of aluminum alloys, which have good heat dissipation and also possess the functions of aesthetics and electromagnetic shielding.

V. Challenges and Prospects