Aluminium ENAW-AlCu4SiMg(A) Plates & Sheets (EU EN, ISO)

Product Description

EN AW-AlCu4SiMg(A), commonly known as 2014A, is a high-strength, copper-based (2xxx series) aluminum alloy. It is a refined version of the standard 2014 alloy, specifically controlled under European (EN) and International (ISO) standards to meet the rigorous demands of the aerospace and defense sectors.

The "(A)" suffix indicates a specific chemical composition variation registered with the Aluminum Association, often requiring tighter control over impurities like iron and silicon compared to the base 2014 grade.

1. Standard Designations

2. Chemical Composition (Typical %)

The alloy's strength is primarily derived from its high copper content, which allows for precipitation hardening.

• Copper (Cu): 3.90% “ 5.00%

• Silicon (Si): 0.50% “ 0.90%

• Manganese (Mn): 0.40% “ 1.20%

• Magnesium (Mg): 0.20% “ 0.80%

• Iron (Fe): 0.50% max

• Zinc (Zn): 0.25% max

• Aluminium (Al): Remainder

3. Mechanical Properties (EN 485-2)

The properties of 2014A vary based on thickness and temper. The T6 (artificially aged) and T651 (stress-relieved by stretching) tempers are the most common for structural plates and sheets.

4. Physical Properties

• Density: $2.82 \text{ g/cm}3$

• Melting Point: $535\circ\text{C}$

• Modulus of Elasticity: $71 \text{ GPa}$

• Thermal Conductivity: $138 \text{ W/m}\cdot\text{K}$

5. Key Engineering Characteristics

• Machinability: Excellent. 2014A is widely regarded as one of the best aluminum alloys for precision machining, producing small, brittle chips and a high-quality surface finish.

• Weldability: Poor. Fusion welding is generally not recommended as it creates a high risk of solidification cracking. Resistance welding (spot or seam) is acceptable.

• Corrosion Resistance: Low. Due to the high copper content, the alloy is prone to atmospheric corrosion.

  • Pro-Tip: For thin sheets, it is often supplied as Alclad 2014A, where the core is sandwiched between layers of high-purity aluminum to provide galvanic protection.

• Anodizing: Good for hard anodizing; fair for protective anodizing (usually results in a darker color).

6. Primary Applications

Because of its high strength-to-weight ratio and ability to retain strength at elevated temperatures (up to $150\circ\text{C}$), 2014A is a staple for:

• Aerospace: Structural frames, skins, and high-load fittings.

• Defense: Military vehicle components and bridging equipment.

• Heavy Industry: Truck frames, high-pressure cylinders, and forged components.