8090-T8x Aluminum alloy,Aluminum 8090-T8x alloy，E FORU

### **Aluminum 8090-T8x Alloy Technical Datasheet** --- #### **1. Product Overview** **Aluminum 8090-T8x** represents a family of advanced aluminum-lithium alloys in various T8-type tempers, specifically developed for aerospace applications requiring optimal combinations of strength, corrosion resistance, and damage tolerance. The T8x designation encompasses several specific tempers (T81, T82, T83, T86, etc.) that have been solution heat-treated, cold worked, and artificially aged to achieve different property combinations tailored for specific application requirements. --- #### **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 density reduction (~8%) and stiffness improvement (~10%) - Copper and magnesium for precipitation strengthening through δ' (Al₃Li) and S' (Al₂CuMg) phases - Zirconium for grain structure control via Al₃Zr dispersoids - Ultra-low iron and silicon for enhanced toughness and corrosion resistance - Specifically designed for T8-type aging responses --- #### **3. Physical Properties** | Property | Metric Value | Imperial Value | |----------|--------------|----------------| | Density | 2.54 g/cm³ | 0.092 lb/in³ | | Melting Range | 600-655°C | 1112-1211°F | | Thermal Conductivity | 85-95 W/m·K | - | | Electrical Conductivity | 18-22% IACS | - | | Modulus of Elasticity | 78 GPa | 11.3 × 10⁶ psi | | Coefficient of Thermal Expansion | 22.5 × 10⁻⁶/°C | 12.5 × 10⁻⁶/°F | | Specific Heat Capacity | 920 J/kg·K | - | | Electrical Resistivity | 78-95 nΩ·m | - | --- #### **4. Mechanical Properties by Temper** **8090-T81 (Solution Heat Treated, Cold Worked, and Artificially Aged):** - **Tensile Ultimate Strength**: 440-500 MPa (64-73 ksi) - **Tensile Yield Strength**: 340-400 MPa (49-58 ksi) - **Elongation**: 8-12% - **Typical Use**: General purpose applications **8090-T82 (Higher Cold Work than T81):** - **Tensile Ultimate Strength**: 460-520 MPa (67-75 ksi) - **Tensile Yield Strength**: 380-440 MPa (55-64 ksi) - **Elongation**: 6-10% - **Typical Use**: Higher strength requirements **8090-T83 (Optimized for Corrosion Resistance):** - **Tensile Ultimate Strength**: 420-480 MPa (61-70 ksi) - **Tensile Yield Strength**: 320-380 MPa (46-55 ksi) - **Elongation**: 10-14% - **Typical Use**: Applications requiring good corrosion resistance **8090-T86 (Higher Cold Work than T82):** - **Tensile Ultimate Strength**: 480-540 MPa (70-78 ksi) - **Tensile Yield Strength**: 420-480 MPa (61-70 ksi) - **Elongation**: 5-8% - **Typical Use**: Maximum strength applications --- #### **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**: Airbus Technical Specifications - **BMS**: Boeing Material Specifications **Temper Standards:** - **EN 515**: Aluminum and aluminum alloys - Temper designations - **ASTM B296**: Standard Practice for Temper Designations - **ISO 2107**: Aluminum temper designations --- #### **6. Product Applications** **Aerospace Primary Structures:** - Aircraft upper and lower wing skins - Fuselage panels and stringers - Spacecraft primary structures - Helicopter airframe components - Military aircraft structural members **Aerospace Secondary Structures:** - Access doors and panels - Fairings and cowlings - Floor beams and supports - Control surfaces - Interior structures **Defense and Space:** - Missile airframes and components - Satellite structural components - Space launch vehicle structures - Military vehicle armor components - Defense system structures **Special Applications:** - High-performance sporting equipment - Racing vehicle components - Advanced transportation systems - Specialized engineering structures - Competition aerospace vehicles --- #### **7. Key Characteristics by Temper** **T81 Temper:** - **Good Balance** of strength and toughness - **Adequate Corrosion Resistance** - **Good Manufacturing Characteristics** - **Suitable for General Applications** **T82/T86 Tempers:** - **Higher Strength** levels - **Good Fatigue Performance** - **Improved Damage Tolerance** - **Suitable for Critical Structures** **T83 Temper:** - **Optimized Corrosion Resistance** - **Good Stress Corrosion Cracking Resistance** - **Adequate Strength** - **Suitable for Aggressive Environments** --- #### **8. Processing Characteristics** **Heat Treatment:** - **Solution Treatment**: 530-540°C (986-1004°F) - **Quenching**: Rapid quenching required - **Cold Working**: 1-8% depending on temper - **Artificial Aging**: 160-190°C (320-374°F) for 16-32 hours **Machining:** - Moderate machinability rating: 35-45% - Requires sharp carbide tooling - Recommended cutting speed: 80-180 m/min - Good surface finish achievable with proper techniques - Special attention to tool geometry and cooling **Forming and Joining:** - **Limited Formability** in T8x tempers - **Excellent Friction Stir Welding** capability - **Good Adhesive Bonding** characteristics - **Mechanical Fastening** - good performance - **Specialized Processes** required for optimal results --- #### **9. Corrosion Resistance** **Performance Characteristics:** - **Atmospheric Corrosion**: Good to very good - **Stress Corrosion Cracking**: T83 offers best resistance - **Exfoliation Corrosion**: Moderate to good resistance - **Galvanic Corrosion**: Requires proper isolation - **Overall Performance**: Suitable for aerospace environments **Comparative Performance:** - T83: Best corrosion resistance - T81/T82: Moderate corrosion resistance - T86: Lower corrosion resistance but highest strength --- #### **10. Quality Assurance and Testing** **Standard Testing:** - Chemical composition verification - Mechanical property testing - Fracture toughness evaluation - Fatigue testing - Corrosion resistance testing **Specialized Testing:** - Differential Scanning Calorimetry (DSC) for phase analysis - Transmission Electron Microscopy (TEM) for microstructure - Small-angle X-ray scattering for precipitate analysis - Non-destructive testing (UT, ET) **Certification:** - Aerospace quality certification - Full material traceability - Nadcap accreditation - Customer-specific approvals - Regular quality system audits --- #### **11. Comparison with Conventional Alloys** | Property | 8090-T8x | 2024-T8x | 7075-T6 | |----------|----------|----------|----------| | Density (g/cm³) | 2.54 | 2.78 | 2.81 | | Specific Strength | Excellent | Good | Very Good | | Stiffness | Superior | Good | Good | | Corrosion Resistance | Good | Fair | Poor-Fair | | Damage Tolerance | Very Good | Good | Fair | --- #### **Conclusion** The 8090-T8x family of aluminum-lithium alloys represents a significant advancement in aerospace materials technology, offering a range of tempers optimized for specific application requirements. The various T8x tempers provide designers with multiple options to balance strength, corrosion resistance, damage tolerance, and manufacturing requirements. These alloys offer substantial weight savings (8-10%) and improved stiffness (10%) compared to conventional aluminum alloys, making them particularly valuable for weight-critical aerospace applications. While requiring specialized processing and careful handling, the 8090-T8x alloys have proven their capability in numerous aerospace applications where performance, reliability, and weight savings are critical. The continued development and application of these advanced aluminum-lithium alloys demonstrate the aerospace industry's ongoing pursuit of lighter, stronger, and more efficient materials for next-generation aircraft and spacecraft.

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 2258 gallon liquid totes Special package is available on request.