Several aluminum alloys are suitable for CNC milling, each offering unique properties and benefits depending on your project requirements. Here's a breakdown of some common choices:

2xxx Series (Wrought Alloys)

• 2024 (AlCu4Mg1):High strength-to-weight ratio, good machinability, weldable. Used in aircraft parts, aerospace components, truck wheels.
• 2017 (AlCuMgNi): Excellent strength and fatigue resistance, good machinability. Used in high-performance parts, gears, shafts.
• 2032 (AlCuMg2): High strength, good corrosion resistance, moderate machinability. Used in boatbuilding, marine applications, structural components.

6xxx Series (Heat-Treatable Alloys)

• 6061 (AlMg1SiCu): The most versatile and widely used alloy, with high strength, excellent machinability, and weldable properties. Used in general engineering, construction components, and electronic enclosures.
• 6082 (AlMgSiMn):High strength, good weldability, and moderate machinability. Used for truck frames, bridges, and building structures.
• 6063 (AlMgSiCu): Good machinability, corrosion resistance, and moderate strength. Used in architectural components, extrusions, and decorative parts.

7xxx Series (Heat-Treatable Alloys)

• 7075 (AlZnMgCu):High strength, good fatigue resistance, and moderate machineability. Used for aircraft parts, sports equipment, and high-performance applications.
• 7050 (AlZnMgCu):High strength, good corrosion resistance, and moderate machinability. Used for military applications, aerospace components, and marine parts.

Other Alloys

• 5052 (AlMg2):Good corrosion resistance, moderate strength, good weldability, and excellent machinability. Used for sheet metal, marine applications, and food processing equipment.
• 3003 (AlMn1):Good formability, weldability, moderate strength, and corrosion resistance. Used in sheet metal, construction materials, and chemical tanks.

Choosing the Right Alloy

Consider these factors when selecting an alloy:

• Required strength and stiffness:Higher strength alloys, such as 7075, provide superior performance, but may necessitate specialized tooling and slower machining speeds.
• Machinability:Alloys such as 6061 and 5052 are easier to machine, lowering production times and tooling costs.
• Corrosion resistance:If your part will be subjected to harsh environments, consider alloys such as 5052 or marine-grade aluminum.
• Weight:Weight-sensitive applications should prioritize lightweight alloys such as 2024 or 7075.
• Weldability:If welding is required, select an alloy with good weldability, such as 6061 or 5052.
• Cost:More complex alloys are usually more expensive.

The best alloy choice is determined by your project's specific requirements, including machinability, strength, weight, corrosion resistance, and cost. If you have any additional questions, such as how to determine whether CNC milling aluminum 6061-T6 is the best process for your needs. Consulting with a CNC machining expert can help you choose the best alloy for your design and application.