8090-T8771 and 8090-T651 Aluminum alloy,Aluminum 8090-T8771 and 8090-T651 alloy，E FORU

### **Aluminum 8090-T8771 and 8090-T651 Alloy Technical Datasheet** --- #### **1. Product Overview** **Aluminum 8090-T8771 and 8090-T651** are specialized tempers of the advanced aluminum-lithium alloy 8090, designed for different application requirements in the aerospace industry. The T8771 temper is optimized for superior corrosion resistance and damage tolerance, while the T651 temper provides high strength and good stress corrosion resistance for structural applications. --- #### **2. Chemical Composition (Weight %)** | Element | Composition Range | Typical Value | |---------|-------------------|---------------| | Aluminum (Al) | Balance | ≥95.8% | | Lithium (Li) | 2.2 - 2.7% | 2.45% | | Copper (Cu) | 1.0 - 1.6% | 1.3% | | Magnesium (Mg) | 0.6 - 1.3% | 0.95% | | Zirconium (Zr) | 0.08 - 0.15% | 0.12% | | Iron (Fe) | ≤ 0.15% | 0.10% | | Silicon (Si) | ≤ 0.10% | 0.06% | | Zinc (Zn) | ≤ 0.10% | 0.06% | | Manganese (Mn) | ≤ 0.05% | 0.03% | | Other Elements (each) | ≤ 0.05% | - | | Total Other Elements | ≤ 0.15% | - | **Key Composition Features:** - Lithium addition for 8% density reduction and 10% stiffness improvement - Copper and magnesium for precipitation strengthening - Zirconium for grain structure control via Al₃Zr dispersoids - Ultra-low iron and silicon content for enhanced toughness - Optimized for specific aging responses in T8771 and T651 tempers --- #### **3. Physical Properties** | Property | 8090-T8771 | 8090-T651 | |----------|------------|------------| | Density | 2.54 g/cm³ | 2.54 g/cm³ | | Melting Range | 600-655°C | 600-655°C | | Thermal Conductivity | 84-88 W/m·K | 86-92 W/m·K | | Electrical Conductivity | 17-20% IACS | 19-22% IACS | | Modulus of Elasticity | 78 GPa | 78 GPa | | Coefficient of Thermal Expansion | 22.5 × 10⁻⁶/°C | 22.5 × 10⁻⁶/°C | --- #### **4. Mechanical Properties** **8090-T8771 Temper Properties:** - **Tensile Ultimate Strength**: 400-460 MPa (58-67 ksi) - **Tensile Yield Strength**: 280-340 MPa (41-49 ksi) - **Elongation**: 10-14% - **Shear Strength**: 240-280 MPa (35-41 ksi) - **Fracture Toughness**: 30-34 MPa√m - **Fatigue Strength**: 140-170 MPa (20-25 ksi) **8090-T651 Temper Properties:** - **Tensile Ultimate Strength**: 470-530 MPa (68-77 ksi) - **Tensile Yield Strength**: 380-440 MPa (55-64 ksi) - **Elongation**: 6-10% - **Shear Strength**: 280-320 MPa (41-46 ksi) - **Fracture Toughness**: 26-30 MPa√m - **Fatigue Strength**: 180-210 MPa (26-30 ksi) --- #### **5. International Standards** **Primary Specifications:** - **AMS 4250**: Aluminum Alloy 8090 Plate and Sheet - **AMS 4251**: Aluminum Alloy 8090 Extrusions - **EN 573-3**: Aluminum and aluminum alloys - Chemical composition - **ISO 209**: Wrought aluminum and aluminum alloys **Aerospace Standards:** - **ASTM B909**: Standard Guide for Aluminum Lithium Alloys - **MIL-HDBK-5**: Metallic Materials and Elements for Aerospace Vehicle Structures - **ABD 0031**: Airbus Technical Specification - **BMS 7-336**: Boeing Material Specification --- #### **6. Product Applications** **8090-T8771 Applications:** - Aircraft fuselage skins - Wing panels requiring corrosion resistance - Marine environment aerospace components - Structural parts exposed to corrosive environments - Spacecraft external structures **8090-T651 Applications:** - Aircraft primary structures - Wing spar caps - Fuselage frames - High-stress structural components - Military aircraft structures --- #### **7. Key Characteristics** **8090-T8771 Advantages:** - **Superior Corrosion Resistance** - **Excellent Damage Tolerance** - **Good Stress Corrosion Cracking Resistance** - **Better Formability** - **Enhanced Fatigue Performance** in corrosive environments **8090-T651 Advantages:** - **Higher Strength Levels** - **Good Stress Corrosion Resistance** - **Excellent Fatigue Performance** - **Better Machinability** - **Superior Strength-to-Weight Ratio** --- #### **8. Processing Characteristics** **Heat Treatment Processes:** - **T8771**: Solution treated, stress-relieved, and artificially aged for corrosion resistance - **T651**: Solution treated, stress-relieved by stretching, and artificially aged **Machining:** - **T8771**: Good machinability (45% rating) - **T651**: Moderate machinability (40% rating) - Both require carbide tooling and proper cooling --- #### **9. Corrosion Resistance** **8090-T8771:** - **Excellent atmospheric corrosion resistance** - **Superior stress corrosion cracking resistance** - **Good exfoliation corrosion resistance** - **Excellent marine environment performance** **8090-T651:** - **Good atmospheric corrosion resistance** - **Good stress corrosion cracking resistance** - **Moderate exfoliation corrosion resistance** - **Adequate for most aerospace environments** --- #### **10. Quality Assurance** **Testing Requirements:** - Chemical composition verification - Mechanical property testing - Corrosion resistance evaluation - Fracture toughness testing - Non-destructive testing --- #### **11. Comparison Summary** | Property | T8771 | T651 | |----------|--------|--------| | Primary Advantage | Corrosion Resistance | High Strength | | Strength Level | Moderate | High | | Corrosion Resistance | Excellent | Good | | Damage Tolerance | Superior | Good | | Typical Use | Corrosive Environments | Structural Applications | --- #### **Conclusion** The 8090-T8771 and 8090-T651 tempers offer complementary property profiles to meet different aerospace application requirements. T8771 provides exceptional corrosion resistance and damage tolerance for applications in aggressive environments, while T651 delivers higher strength levels for primary structural components. Both tempers leverage the inherent benefits of aluminum-lithium technology, including reduced density and increased stiffness, providing significant weight savings compared to conventional aluminum alloys. The choice between these tempers depends on specific application requirements, with T8771 being preferred for corrosion-critical applications and T651 for strength-critical structures.

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 2262 gallon liquid totes Special package is available on request.