2624 Aluminum alloy,Aluminum 2624 alloy,E FORU

### **Aluminum Alloy 2624 Product Introduction** **Aluminum Alloy 2624** is a state-of-the-art, damage-tolerant Al-Cu-Mg alloy developed as a further evolution of the highly successful 2524 alloy. It represents the cutting edge in aluminum aerospace materials, offering an optimized balance of **superior tensile strength** and **exceptional fatigue crack growth resistance**. Developed primarily for next-generation commercial and military aircraft, AA2624 is engineered to enable lighter, more efficient, and more durable airframe structures. --- #### **1. Chemical Composition** The composition of AA2624 is a carefully calibrated refinement of the 2XXX-series, with even stricter control over impurity elements to maximize both strength and damage tolerance. Key elements are (typical values in weight %): | Element | Content (%) | | :--- | :--- | | **Copper (Cu)** | 3.9 - 4.5 | | **Magnesium (Mg)** | 1.2 - 1.6 | | **Manganese (Mn)** | 0.45 - 0.7 | | **Silver (Ag)** | 0.05 - 0.15 | *(A key differentiating element)* | | **Iron (Fe)** | 0.08 max | *(Very tight control)* | | **Silicon (Si)** | 0.06 max | *(Very tight control)* | | **Zinc (Zn)** | 0.10 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. * **Critically Low Iron (Fe) and Silicon (Si):** This minimizes brittle intermetallic particles, drastically improving toughness and fatigue performance. * **Silver (Ag):** A key addition in some advanced variants. Silver modifies the precipitation kinetics and microstructure, leading to a finer and more uniform distribution of strengthening phases, which enhances strength without compromising toughness. --- #### **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** AA2624 is typically supplied in T3-type tempers (e.g., T39). Its key improvement lies in offering higher strength than 2524 while maintaining similarly excellent damage tolerance. Typical properties for 2624-T39 sheet/plate are: * **Tensile Ultimate Strength:** 465 - 500 MPa (67 - 72 ksi) * **Tensile Yield Strength:** 325 - 365 MPa (47 - 53 ksi) * **Elongation:** 12 - 18% * **Fracture Toughness:** Exceptionally high, comparable to or better than 2524. * **Fatigue Crack Growth Resistance:** Outstanding; provides superior resistance to the initiation and propagation of fatigue cracks compared to traditional alloys like 2024. --- #### **4. International Standards** As a premium and advanced aerospace alloy, AA2624 is covered by key industry and OEM standards. * **AMS:** **AMS 4418** (This is the primary Aerospace Material Specification for 2624 alloy plate). * **ASTM:** While specific ASTM standards may not be the primary reference, its properties align with the spirit of specifications like **ASTM B209**. * **OEM Specifications:** It is extensively specified and used by **The Boeing Company** for its latest aircraft models. It is a critical material for the **Boeing 787 Dreamliner**, and its use is often governed by detailed Boeing proprietary material specifications that build upon the AMS requirements. --- #### **5. Product Applications** The primary application of AA2624 is in the most critically stressed areas of modern aircraft structures. * **Aircraft Fuselage Skins:** Its combination of higher strength and superior damage tolerance is ideal for withstanding pressurization cycles, allowing for potential weight reduction and increased design allowables. * **Upper Wing Skins and Lower Wing Skins:** Resists both compressive and tensile loads, offering an improved strength-to-weight ratio over 2524 in these applications. * **Bulkheads** and other primary structural members where both static strength and fatigue life are critical. --- #### **6. Key Advantages** * **Optimized Strength-Toughness Balance:** Provides a higher static strength than 2524 while maintaining its world-class fracture toughness and fatigue resistance. * **Enhanced Damage Tolerance:** Offers exceptional resistance to fatigue crack growth, leading to longer operational life and increased safety. * **Weight Reduction Potential:** The higher strength allows for the design of thinner, lighter sections while meeting stringent damage tolerance requirements, contributing directly to improved fuel efficiency. * **Next-Generation Performance:** Represents the evolution of aluminum airframe materials, competing effectively with composite structures in many key applications. * **Proven in Flight:** Its extensive use in the Boeing 787 Dreamliner demonstrates its capability and reliability in the most advanced commercial aircraft. **Conclusion** Aluminum Alloy 2624 is a pinnacle of modern aluminum aerospace metallurgy. By building upon the success of 2524 and incorporating advanced compositional controls and processing, it delivers an unbeatable combination of high strength and superior damage tolerance. It is a key enabling material for the aerospace industry's pursuit of lighter, safer, and more efficient aircraft, solidifying the role of advanced aluminum alloys in the future of flight alongside composite technologies.

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 1643 gallon liquid totes Special package is available on request.