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Aluminum

2024-T3

2024-T3 is a copper-bearing (2000-series) aluminum prized for fatigue resistance, supplied solution-treated and naturally aged (T3). With about 345 MPa yield and good toughness, it sits between 6061 and 7075 in strength but leads on resistance to crack growth under cyclic loading, which is why it remains an airframe-skin staple.

How 2024-T3 machines

Machines reasonably well (rated 3.5/5), similar to other high-strength aluminums. It cuts cleanly with sharp carbide and produces good finishes, though it is more abrasive than soft 6000-series grades and harder on edges. Standard aluminum speeds and feeds apply, with attention to chip evacuation and avoiding built-up edge.

Manufacturing & processing

Well suited to CNC machining and especially sheet metal forming, the basis of riveted aircraft skins. It is typically joined by riveting rather than welding, since arc welding degrades the alloy. Because the copper content reduces corrosion resistance, it is often supplied Alclad (pure-aluminum-clad) or is anodized/primed for protection.

Typical applications

The classic fatigue-resistant aerospace material: aircraft fuselage and wing skins, stringers, ribs, and tension-loaded structural members, plus aircraft fittings and some high-performance automotive and racing parts. It is selected where parts see repeated load cycles and long fatigue life is the governing requirement.

When to choose it

Choose 2024-T3 when fatigue life and damage tolerance under cyclic loads drive the design, as in airframe skins. Pick 7075-T6 when you need higher static strength, or 6061-T6 when you want weldability, better corrosion resistance, and lower cost. Use Alclad or coatings if corrosion exposure is significant.

Suitable surface finishes

Common finishes for 2024-T3: Type II anodizing, chromate/Alodine, powder coating, bead blasting. Use the finish selector →

FAQ

Why is 2024 used for aircraft skins?
Because of its excellent fatigue resistance and damage tolerance. Aircraft skins endure millions of pressurization and flight load cycles, and 2024-T3 resists crack initiation and slow crack growth better than higher-strength alloys like 7075, making it the long-standing choice for tension-loaded fuselage and wing skin panels.
Can 2024-T3 be welded?
Not by conventional arc welding; the copper content makes it crack-prone and degrades strength in the weld zone. It is normally joined by riveting or mechanical fastening. Friction stir welding can join 2024 in specialized aerospace applications, but standard TIG/MIG welding is not recommended.
Is 2024-T3 corrosion resistant?
Less so than most aluminums; its copper content lowers corrosion resistance (rated 2.0 here). It is frequently supplied Alclad with a thin pure-aluminum surface layer, or is anodized and primed, to protect against corrosion in service. Bare 2024 in moist environments needs a protective finish.

Property values are typical/nominal for early guidance and vary by temper, grade, supplier and heat treatment. Confirm critical specs against a certified datasheet or with an mfgiq engineer.