2618-T6 Aluminum alloy,Aluminum 2618-T6 alloy,E FORU

### **Aluminum Alloy 2618-T6 Product Introduction** **Aluminum Alloy 2618-T6** is the heat-treated version of the classic 2618A alloy, optimized for maximum strength and stability at elevated temperatures. The **T6 temper** (Solution Heat-Treated and then Artificially Aged) unlocks the alloy's full potential, providing an exceptional combination of high strength, excellent creep resistance, and good machinability. This makes it a premier choice for critical components in aerospace, automotive, and tooling industries that operate under sustained thermal and mechanical stress. --- #### **1. Chemical Composition** The composition of AA2618 is precisely controlled to form stable intermetallic phases that are key to its high-temperature performance. Key elements are (typical values in weight %): | 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)**: The primary age-hardening elements, forming S' (Al₂CuMg) precipitates during the T6 aging process. * **Iron (Fe)** and **Nickel (Ni)**: Form the stable **Al₉FeNi** phase. This phase is crucial for retaining strength and resisting creep at elevated temperatures by pinning grain boundaries and dislocations. * **Silicon (Si)**: Carefully controlled to aid in the precipitation hardening process during the T6 treatment. --- #### **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 (T6 Temper)** The T6 temper provides a robust combination of strength and ductility, with exceptional retention of these properties at high temperatures. The following are typical minimum or average properties for 2618-T6: * **Tensile Ultimate Strength:** 440 - 480 MPa (64 - 70 ksi) * **Tensile Yield Strength (0.2% Offset):** 370 - 410 MPa (54 - 59 ksi) * **Elongation (% in 50mm):** 8 - 12% * **Elevated Temperature Performance:** Retains approximately **70-80% of its room temperature yield strength at 200°C (392°F)**. * **Creep Resistance:** Excellent long-term stability under load at high temperatures, a defining characteristic of the T6 condition. * **Fatigue Strength:** Good fatigue performance, suitable for dynamically loaded components. --- #### **4. International Standards** Aluminum Alloy 2618-T6 is specified in several international standards for wrought products. * **AMS (Aerospace Material Specification):** * **AMS 4124** (Sheet and Plate) * **AMS 4125** (Forging Stock) * **EN (European Norm):** **EN 2118** (A key standard for forgings in the aerospace industry). * **ISO:** **ISO 6361-2** (Wrought Aluminum and Aluminum Alloy Sheets, Strips and Plates). * **ASTM:** **ASTM B211** (Standard Specification for Aluminum-Alloy Bar, Rod, and Wire). --- #### **5. Product Applications** The 2618-T6 condition is specified for the most demanding applications where its heat-treated properties are essential. * **Aerospace:** * **Pistons and Cylinder Heads for Aircraft Engines** * **Impellers, Compressor Wheels, and Turbocharger Blades** * **Wheels, Brake Components, and Structural Forgings** * **Skin Panels for Supersonic Aircraft** (e.g., Concorde) * **Automotive (High-Performance & Racing):** * **Forged Pistons** - The T6 temper provides the necessary strength and thermal stability for high-revving, high-compression engines. * **Engine Blocks and Cylinder Liners** * **Tooling and Manufacturing:** * **Molds for Plastic Injection Molding** - Its thermal stability ensures consistent mold dimensions under cyclic heating. * **Die Casting Dies** for less aggressive casting metals. --- #### **6. Key Advantages of the T6 Temper** * **Optimized Strength:** The T6 aging process precipitates hardening phases (S') to achieve the peak strength for this alloy. * **Superior Thermal Stability:** The stable Al₉FeNi phase, combined with the optimized T6 microstructure, provides outstanding resistance to softening and creep at temperatures up to 250°C. * **Excellent Machinability:** In the T6 condition, the alloy machines to a good surface finish, allowing for the production of precise components like pistons. * **Good Forgeability:** The alloy is typically forged and then heat-treated to the T6 temper to achieve the final desired properties in a complex component. * **Proven Reliability:** A long history of successful use in critical, safety-related applications. **Conclusion** **Aluminum Alloy 2618-T6** is the fully realized, high-performance version of the 2618 alloy. The T6 heat treatment is not merely a step but a crucial defining process that tailors its microstructure for maximum performance under stress and heat. It remains a benchmark material for high-integrity forged and machined components in the most demanding thermal-mechanical environments, from the skies to the racetrack.

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 1641 gallon liquid totes Special package is available on request.