2424 Aluminum alloy,Aluminum 2424 alloy,E FORU

### **Aluminum Alloy 2424 Product Introduction** **Aluminum Alloy 2424** is a high-toughness, damage-tolerant Al-Cu-Mg alloy, primarily developed for advanced aerospace applications. It is an enhanced version of the widely used 2024 alloy, offering superior **fracture toughness** and **fatigue crack growth resistance** while maintaining high strength. This combination of properties makes it an ideal material for critical aircraft structures where durability, damage tolerance, and weight savings are paramount. --- #### **1. Chemical Composition** The composition of AA2424 is carefully balanced to optimize its damage tolerance and strength. Key elements are (typical values in weight %): | Element | Content (%) | | :--- | :--- | | **Copper (Cu)** | 3.5 - 4.5 | | **Magnesium (Mg)** | 1.2 - 1.8 | | **Manganese (Mn)** | 0.30 - 0.9 | | **Iron (Fe)** | 0.12 max | | **Silicon (Si)** | 0.10 max | | **Zinc (Zn)** | 0.25 max | | **Titanium (Ti)** | 0.10 max | | **Other Impurities** | each 0.05 max, total 0.15 max | | **Aluminum (Al)** | Balance | * **Copper (Cu)** and **Magnesium (Mg)** are the primary strengthening elements, forming the S' (Al₂CuMg) precipitates during aging. * The controlled low levels of **Iron (Fe)** and **Silicon (Si)** are crucial for achieving high fracture toughness and fatigue resistance. * **Manganese (Mn)** helps in forming dispersoids that control grain structure. --- #### **2. Physical Properties** | Property | Value / Description | | :--- | :--- | | **Density** | Approximately 2.78 g/cm³ | | **Melting Range** | ~ 500 - 650 °C | | **Modulus of Elasticity** | Approximately 73 GPa (10.6 x 10⁶ psi) | | **Thermal Conductivity** | ~ 120-130 W/m·K (at 25°C) | | **Electrical Conductivity** | ~ 30-40% IACS | | **Coefficient of Thermal Expansion** | ~ 23.2 x 10⁻⁶ /K | --- #### **3. Mechanical Properties** AA2424 is primarily supplied in T3-type tempers (solution heat-treated, cold worked, and naturally aged) to maximize its damage tolerance. Typical properties for 2424-T3**9** (an enhanced variant) plate are: * **Tensile Ultimate Strength:** 455 - 490 MPa (66 - 71 ksi) * **Tensile Yield Strength:** 310 - 345 MPa (45 - 50 ksi) * **Elongation:** 10 - 15% * **Fracture Toughness:** Exceptionally high, particularly in the short-transverse direction. * **Fatigue Crack Growth Resistance:** Excellent, significantly improved over standard 2024-T3. --- #### **4. International Standards** As a specialized aerospace alloy, AA2424 is covered by key industry standards. * **AMS:** **AMS 4257** (This is the primary Aerospace Material Specification for 2424 alloy plate). * **ASTM:** While less common in general ASTM standards, its properties align with the requirements of specifications like **ASTM B209** for Aluminum-Alloy Plate. * **OEM Specifications:** It is extensively specified by aerospace manufacturers, most notably **Boeing**, for use in their commercial aircraft programs (e.g., Boeing 777, 787 Dreamliner). --- #### **5. Product Applications** The primary application of AA2424 is in the aerospace industry, where its damage tolerance is critical for safety and longevity. * **Aircraft Structures:** * **Lower Wing Skins and Panels:** This is the most common application, where the material's superior fatigue crack growth resistance is essential to withstand cyclic tensile loads. * **Fuselage Skins** (in some applications). * **Aerospace Vehicles:** * Other primary structural components requiring a high level of damage tolerance. --- #### **6. Key Advantages** * **Superior Damage Tolerance:** Offers an excellent combination of high fracture toughness and slow fatigue crack growth, leading to longer service life and improved safety. * **High Strength-to-Weight Ratio:** Provides excellent structural efficiency, contributing to weight reduction in aircraft. * **Proven Reliability:** As a successor to 2024, it brings enhanced performance with a well-understood metallurgical basis. * **Optimized for Aerospace:** Specifically designed to meet the demanding damage tolerance requirements of modern commercial aircraft. **Conclusion** Aluminum Alloy 2424 represents a significant evolution in the family of high-strength aluminum alloys for aerospace. By prioritizing damage tolerance and fatigue performance, it has become a material of choice for critical airframe components, particularly lower wing skins, in next-generation commercial aircraft. Its use is a key factor in enabling lighter, more fuel-efficient, and safer aircraft designs.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 1637 gallon liquid totes Special package is available on request.