2618A Aluminum alloy,Aluminum 2618A alloy,E FORU

### **Aluminum Alloy 2618A Product Introduction** **Aluminum Alloy 2618A** is a high-strength, heat-treatable Al-Cu-Mg-Fe-Ni alloy renowned for its exceptional **elevated temperature strength** and **creep resistance**. Originally developed for supersonic aircraft and high-performance engine applications, it maintains good mechanical properties at temperatures up to 200-250°C (392-482°F). Its unique composition, which includes iron and nickel, provides stability and strength under prolonged thermal exposure, making it a classic choice for demanding aerospace and automotive applications. --- #### **1. Chemical Composition** The composition of AA2618A is balanced to form stable intermetallic phases that enhance high-temperature performance. Key elements are (typical values in weight % according to EN 573-3): | Element | Content (%) | | :--- | :--- | | **Copper (Cu)** | 1.8 - 2.7 | | **Magnesium (Mg)** | 1.2 - 1.8 | | **Iron (Fe)** | 0.9 - 1.4 | | **Nickel (Ni)** | 0.8 - 1.4 | | **Silicon (Si)** | 0.15 - 0.25 | | **Titanium (Ti)** | 0.04 - 0.10 | | **Zinc (Zn)** | 0.10 max | | **Manganese (Mn)** | 0.15 max | | **Other Impurities** | each 0.05 max, total 0.15 max | | **Aluminum (Al)** | Balance | * **Copper (Cu)** and **Magnesium (Mg)** provide primary age-hardening through the formation of S' (Al₂CuMg) precipitates. * **Iron (Fe)** and **Nickel (Ni)** combine to form the stable **Al₉FeNi** phase. This phase is crucial for retaining strength and resisting creep at elevated temperatures by inhibiting grain growth and dislocation movement. * **Silicon (Si)** is controlled to a specific range to aid in the formation of desired precipitates during aging. --- #### **2. Physical Properties** | Property | Value / Description | | :--- | :--- | | **Density** | Approximately 2.76 g/cm³ | | **Melting Range** | ~ 550 - 650 °C | | **Modulus of Elasticity** | Approximately 74 GPa (10.7 x 10⁶ psi) | | **Thermal Conductivity** | ~ 120-140 W/m·K (at 25°C) | | **Electrical Conductivity** | ~ 35-42% IACS | | **Coefficient of Thermal Expansion** | ~ 22.0 x 10⁻⁶ /K | --- #### **3. Mechanical Properties** Mechanical properties are optimized through the T6 temper (solution heat-treated and artificially aged). Typical properties for 2618A-T6 at room temperature are: * **Tensile Ultimate Strength:** 420 - 460 MPa (61 - 67 ksi) * **Tensile Yield Strength:** 340 - 380 MPa (49 - 55 ksi) * **Elongation:** 8 - 12% * **Elevated Temperature Strength:** Retains a significant portion of its strength (e.g., >70% of room temperature yield strength) at 200°C. * **Creep Resistance:** Excellent long-term stability under load at high temperatures. --- #### **4. International Standards** Aluminum Alloy 2618A is recognized in several international standards, with a strong presence in European aerospace specifications. * **EN (European Norm):** **EN 2118** (This is a key standard for 2618A alloy forgings in the aerospace industry). * **AMS (Aerospace Material Specification):** **AMS 4124** (Sheet and Plate) and **AMS 4125** (Forging Stock). * **ISO:** **ISO 6361-2** (Wrought Aluminum and Aluminum Alloy Sheets, Strips and Plates). * **Proprietary Standards:** It has been historically specified for critical components in aerospace programs like the Concorde. --- #### **5. Product Applications** AA2618A's unique properties make it suitable for high-stress applications in elevated temperature environments. * **Aerospace:** * **Pistons for Aircraft Engines** * **Compressor Wheels** and impellers in turbochargers. * **Wheels and Brake Components** * **Structural Forgings** for supersonic airframes (e.g., the Concorde's skin). * **Automotive (High-Performance):** * **Forged Pistons** for high-performance and racing engines. * **Cylinder Heads** and other engine components requiring thermal stability. * **General Engineering:** * **Tooling** and **molds** for plastic injection molding. --- #### **6. Key Advantages** * **Excellent Elevated Temperature Properties:** Superior strength retention and creep resistance compared to most other conventional aluminum alloys. * **Good Forgeability:** Can be readily forged into complex shapes, making it ideal for high-integrity components like pistons and wheels. * **High Strength-to-Weight Ratio:** Provides excellent structural efficiency at both room and elevated temperatures. * **Good Machinability:** Can be machined to precise tolerances in the heat-treated condition. * **Proven Track Record:** A well-established and reliable material for the most demanding thermal-mechanical applications. **Conclusion** Aluminum Alloy 2618A is a specialized, high-performance material designed to operate where heat and stress converge. Its classic composition, stabilized by iron and nickel, ensures long-term performance in critical applications ranging from supersonic aircraft to high-revving racing engines. While newer alloys exist, 2618A remains a benchmark for elevated temperature aluminum applications, valued for its reliability and proven capabilities.

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 1640 gallon liquid totes Special package is available on request.