2022 Aluminum alloy,Aluminum 2022 alloy,E FORU

### **2022 Aluminum Alloy Product Introduction** **Overview** 2022 Aluminum Alloy is a high-strength, heat-treatable aluminum-copper alloy designed primarily for **elevated temperature service**. It belongs to the family of complex Al-Cu alloys that use specific dispersoid-forming elements to inhibit grain growth and strength loss at high temperatures. While similar in concept to alloy 2021, 2022 possesses a distinct chemical composition that tailors its properties for specific performance windows. It is characteristically used in a solution heat-treated and artificially aged temper (such as T6 or T8) to achieve optimal strength and thermal stability. --- #### **1. Chemical Composition (Typical Weight %)** The composition of 2022 is defined by its high copper content and strategic additions of manganese and other elements. | Element | Minimum (%) | Maximum (%) | Notes | | :--- | :--- | :--- | :--- | | **Aluminum (Al)** | Balance | Balance | - | | **Copper (Cu)** | 4.5 | 5.5 | Primary strengthening element through precipitation hardening. | | **Manganese (Mn)** | 0.40 | 0.8 | Forms stable dispersoids (Al₂₀Cu₂Mn₃) that retard recovery and recrystallization at high temperatures. | | **Titanium (Ti)** | 0.05 | 0.15 | Acts as a grain refiner during solidification. | | **Vanadium (V)** | 0.05 | 0.15 | **Key element** that forms fine, stable dispersoids (Al₂₁V₂) which significantly contribute to high-temperature stability. | | **Zinc (Zn)** | - | 0.10 | Impurity. | | **Silicon (Si)** | - | 0.10 | Impurity. | | **Iron (Fe)** | - | 0.10 | Impurity. | | **Others (Each)** | - | 0.05 | - | | **Others (Total)** | - | 0.15 | - | **Key Point:** The combination of **Manganese (Mn)** and **Vanadium (V)** is critical. These elements form thermally stable dispersoids that effectively pin grain boundaries and dislocations, allowing the alloy to resist softening and maintain its strength during prolonged exposure to elevated temperatures. --- #### **2. Physical Properties** | Property | Value / Description | | :--- | :--- | | **Density** | ~2.80 g/cm³ (0.101 lb/in³) | | **Melting Range** | ~ 525°C - 640°C (~975°F - 1185°F) | | **Electrical Conductivity** | ~ 35-40% IACS (International Annealed Copper Standard) | | **Thermal Conductivity** | ~ 125-135 W/m·K | | **Coefficient of Thermal Expansion** | ~ 23.4 x 10⁻⁶/°C (20-100°C) | --- #### **3. Mechanical Properties (Typical for T6/T8 Temper)** 2022 is used in artificially aged tempers to develop high strength and thermal stability. | Temper | Tensile Strength | Yield Strength (0.2% Offset) | Elongation (% in 50mm) | Notes | | :--- | :--- | :--- | :--- | :--- | | **2022-T6/T8** | ~ 430-480 MPa (62-70 ksi) | ~ 350-400 MPa (51-58 ksi) | ~ 5-10% | Retains a significant portion of this strength after exposure to temperatures of 150-200°C (300-400°F). | *Note: The "T8" temper (solution heat-treated, cold worked, and artificially aged) often provides superior stress-corrosion cracking resistance and slightly higher strength compared to the T6 temper.* --- #### **4. International Standards** 2022 is a specialized alloy covered by specific standards, particularly in the aerospace sector. | Standard System | Alloy Designation | Common Tempers | | :--- | :--- | :--- | | **ASTM (USA)** | **2022** | T6, T8 | | **AMS (Aerospace)** | **AMS 4205** | T8 (Sheet and Plate) | | **UNS (USA)** | **A92022** | - | --- #### **5. Product Applications** Due to its high-temperature capabilities, 2022 is almost exclusively used in demanding aerospace and defense applications. * **Aerospace & Supersonic Aviation:** * **Supersonic Aircraft Skin and Structural Panels:** Designed to withstand the kinetic heating effects of sustained high-speed (Mach 2+) flight. * **Rocket and Missile Structures:** Used for motor casings, airframes, and bulkheads where strength must be maintained during high-speed flight and potential heating. * **Engine Components:** Parts in proximity to jet engines that experience elevated temperatures, such as certain cowlings and fairings. --- #### **6. Key Advantages & Considerations** * **Advantages:** * **Excellent Thermal Stability:** Superior retention of strength and resistance to creep at elevated temperatures (150-200°C) compared to conventional alloys like 2024. * **High Strength-to-Weight Ratio at Temperature:** Offers a lightweight alternative to titanium or steel in certain moderate high-temperature applications. * **Good Fatigue Performance:** Maintains good fatigue resistance under cyclic loading at elevated temperatures. * **Considerations:** * **Poor Corrosion Resistance:** Inherent to high-copper aluminum alloys. Requires comprehensive protective systems, typically **Alclad** cladding for sheet products or anodizing and painting for components. * **Limited Formability:** In its high-strength temper, ductility is low. Complex parts are often formed in the annealed ("O") condition and then heat-treated. * **Not Weldable:** Highly susceptible to solidification cracking and loss of properties in the heat-affected zone. Components are typically joined mechanically (riveting, bolting). * **Niche and High-Cost Alloy:** Its specialized nature and complex chemistry make it more expensive than standard aerospace alloys. **Conclusion** 2022 Aluminum Alloy is a premium, performance-driven material engineered for the extreme environment of high-speed flight. Its value lies not in its room-temperature properties, but in its ability to retain those properties when other aluminum alloys would soften and fail. While it demands careful handling regarding corrosion protection and fabrication, it remains a critical material solution in the aerospace industry for pushing the boundaries of speed and performance where every gram counts.

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 1529 gallon liquid totes Special package is available on request.