2091-T8x Aluminum alloy,Aluminum 2091-T8x alloy,E FORU

### **Product Datasheet: 2091-T8x Aluminum Alloy** --- #### **1. Overview** 2091-T8x Aluminum Alloy is a second-generation aluminum-lithium (Al-Cu-Li-Mg) alloy supplied in various T8-type tempers (solution heat-treated, cold worked, and artificially aged). This alloy family represents a significant improvement over first-generation Al-Li alloys, offering better isotropy, improved corrosion resistance, and enhanced manufacturability while maintaining the weight reduction advantages of lithium-containing aluminum alloys. The T8x designation covers multiple specific aging conditions tailored for different strength-toughness combinations. --- #### **2. International Standards** - **UNS**: UNS A92091 - **ASTM**: ASTM B209 (Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate) - **AMS**: AMS 4258 (Aerospace Material Specification) - **AA (Aluminum Association)**: AA 2091 - **ISO**: ISO 6361-2 (Wrought Aluminum and Aluminum Alloy Sheet, Strip and Plate) --- #### **3. Chemical Composition (Weight %)** | Element | Content (%) | |---------|-------------| | **Aluminum (Al)** | Balance | | **Copper (Cu)** | 1.8–2.5 | | **Lithium (Li)** | 1.7–2.3 | | **Magnesium (Mg)** | 1.1–1.6 | | **Zirconium (Zr)** | 0.08–0.15 | | **Iron (Fe)** | ≤ 0.12 | | **Silicon (Si)** | ≤ 0.10 | | **Manganese (Mn)** | ≤ 0.10 | | **Zinc (Zn)** | ≤ 0.10 | | **Titanium (Ti)** | ≤ 0.10 | | **Other Elements** | ≤ 0.05 each | | **Total Others** | ≤ 0.15 | --- #### **4. Physical Properties** | Property | Value | |----------|-------| | **Density** | 2.57–2.59 g/cm³ (0.0928–0.0935 lb/in³) | | **Melting Range** | ~560–650°C (1040–1200°F) | | **Electrical Conductivity** | ~20–24 % IACS | | **Thermal Conductivity** | 60–80 W/m·K | | **Coefficient of Thermal Expansion** | 20.5–21.5 × 10⁻⁶/°C (20–100°C) | | **Modulus of Elasticity** | 76.0–78.0 GPa (11,000–11,300 ksi) | --- #### **5. Mechanical Properties (T8x Temper Range)** | Property | T81 Condition | T83 Condition | T85 Condition | |----------|---------------|---------------|---------------| | **Tensile Strength (Ultimate)** | 440–490 MPa | 470–520 MPa | 500–550 MPa | | **Tensile Yield Strength** | 350–400 MPa | 400–450 MPa | 450–500 MPa | | **Elongation at Break** | 8–12% | 7–10% | 5–8% | | **Fracture Toughness** | 30–36 MPa√m | 26–32 MPa√m | 22–28 MPa√m | | **Fatigue Strength** | 140–170 MPa | 150–180 MPa | 160–190 MPa | --- #### **6. Key Characteristics & Advantages** - **Improved Isotropy**: Reduced anisotropy compared to first-generation Al-Li alloys - **Enhanced Corrosion Resistance**: Better general and stress corrosion resistance - **Weight Reduction**: 8–10% lower density than conventional aluminum alloys - **Good Damage Tolerance**: Balanced strength and toughness properties - **Better Formability**: Improved manufacturing characteristics - **Multiple Aging Options**: Various T8x tempers for property optimization - **Cryogenic Suitability**: Excellent low-temperature properties --- #### **7. Product Applications** - **Aircraft Structures**: Fuselage skins, wing panels, and bulkheads - **Spacecraft Components**: Satellite structures and space frames - **Military Applications**: Military aircraft structural components - **Helicopter Structures**: Rotor blades and airframe components - **Cryogenic Systems**: Liquid gas storage and handling equipment - **Racing Components**: High-performance automotive and motorsport parts --- #### **8. Available Forms** - Sheet (0.5–8.0 mm thickness) - Plate (8–80 mm thickness) - Extruded Profiles and Bars - Forging Stock --- #### **9. Processing Guidelines** - **Heat Treatment Selection**: T8x temper chosen based on application requirements - **Forming Operations**: Best performed in annealed condition before final aging - **Machining Considerations**: Special techniques recommended for lithium-containing alloys - **Joining Methods**: Weldable with appropriate procedures and post-weld heat treatment - **Surface Protection**: Requires corrosion protection for severe environments - **Quality Assurance**: Comprehensive testing for critical aerospace applications --- **Disclaimer**: The information presented is typical and for reference only. Actual properties may vary with processing, size, and specific T8x temper. For critical applications, contact our technical service team for specific data and processing recommendations.

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 1586 gallon liquid totes Special package is available on request.