8090-T852 Aluminum alloy,Aluminum 8090-T852 alloy，E FORU

### **Aluminum 8090-T852 Alloy Technical Datasheet** --- #### **1. Product Overview** **Aluminum 8090-T852** is a specialized temper of the advanced aluminum-lithium alloy 8090, designed to provide an optimal combination of high strength, excellent stress corrosion cracking resistance, and good damage tolerance for plate applications. The T852 temper indicates the material has been solution heat-treated, stress-relieved by compression, and artificially aged to achieve superior properties for critical aerospace structures. --- #### **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 through δ' (Al₃Li) and S' (Al₂CuMg) phases - Zirconium for grain structure control via Al₃Zr dispersoids - Ultra-low iron and silicon content for enhanced toughness - Specifically optimized for plate applications and T852 aging response --- #### **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 | 85-90 W/m·K | - | | Electrical Conductivity | 18-21% 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 | 82-95 nΩ·m | - | --- #### **4. Mechanical Properties (T852 Temper)** **Typical Mechanical Properties:** - **Tensile Ultimate Strength**: 430-490 MPa (62-71 ksi) - **Tensile Yield Strength (0.2% Offset)**: 320-380 MPa (46-55 ksi) - **Elongation in 50 mm**: 9-13% - **Shear Strength**: 250-290 MPa (36-42 ksi) - **Hardness (Vickers)**: 130-150 HV - **Fatigue Strength** (R=0.1, 5×10⁸ cycles): 150-180 MPa (22-26 ksi) - **Compressive Yield Strength**: 310-370 MPa (45-54 ksi) - **Fracture Toughness (K Ic)**: 29-33 MPa√m - **Bearing Strength**: 650-710 MPa (94-103 ksi) - **Bearing Yield Strength**: 490-550 MPa (71-80 ksi) --- #### **5. International Standards** **Primary Specifications:** - **AMS 4250**: Aluminum Alloy 8090 Plate and Sheet - **EN 573-3**: Aluminum and aluminum alloys - Chemical composition - **ISO 209**: Wrought aluminum and aluminum alloys - **GB/T 3190**: Wrought aluminum and aluminum alloy chemical composition **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 **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** **Aircraft Plate Structures:** - Wing skin panels - Fuselage panels - Bulkhead plates - Floor panels - Structural plate components **Aerospace Components:** - Spacecraft structural panels - Satellite structural plates - Missile body sections - Helicopter structural plates - Military aircraft armor plates **Defense Applications:** - Military vehicle armor plates - Ballistic protection panels - Defense system structural plates - Military infrastructure components - Specialized defense applications **High-Performance Applications:** - Racing vehicle structural panels - High-performance sporting equipment - Specialized engineering structures - Advanced transportation systems - Competition aerospace vehicles --- #### **7. Key Characteristics** **T852 Temper Advantages:** - **Excellent Stress Corrosion Cracking Resistance** - **Good Strength-to-Weight Ratio** - **Superior Stiffness** (10% higher than conventional alloys) - **Good Damage Tolerance** - **Excellent Fatigue Performance** - **Enhanced Dimensional Stability** **Plate-Specific Benefits:** - **Uniform Properties** through thickness - **Good Surface Quality** - **Excellent Flatness** characteristics - **Adequate Machinability** - **Good Weldability** with proper techniques --- #### **8. Processing Characteristics** **Heat Treatment Process:** - **Solution Treatment**: 530-540°C (986-1004°F) for 1-2 hours - **Quenching**: Rapid water quenching - **Stress Relieving**: Compression (1-3%) - **Artificial Aging**: 160-170°C (320-338°F) for 24-30 hours **Machining:** - Moderate machinability rating: 42% - Requires sharp carbide tooling - Recommended cutting speed: 85-180 m/min - Feed rate: 0.10-0.25 mm/rev - Good surface finish achievable with proper techniques **Forming Operations:** - **Good Bendability** with proper tooling - **Adequate for Light Forming** - **Springback Control** required - **Hot Forming** recommended for complex shapes - **Limited Deep Drawing** capability **Joining Methods:** - **Excellent Friction Stir Welding** capability - **Good Adhesive Bonding** characteristics - **Mechanical Fastening** - good performance - **Limited Arc Welding** suitability - **Specialized Techniques** recommended --- #### **9. Corrosion Resistance** **Performance Characteristics:** - **Atmospheric Corrosion**: Good resistance - **Stress Corrosion Cracking**: Excellent resistance - **Exfoliation Corrosion**: Good resistance - **Galvanic Corrosion**: Requires proper isolation - **Overall Performance**: Excellent for aerospace environments **Protection Methods:** - Chemical conversion coatings (Alodine) - Primer and paint systems - Clad versions available for improved corrosion resistance - Proper material selection for mating components - Regular inspection and maintenance --- #### **10. Quality Assurance** **Testing Requirements:** - Chemical composition verification - Mechanical property testing - Fracture toughness evaluation - Fatigue testing - Corrosion resistance testing - Non-destructive testing **Specialized Testing:** - Differential Scanning Calorimetry for phase analysis - Transmission Electron Microscopy for microstructure - Small-angle X-ray scattering for precipitate analysis - Fatigue crack growth rate testing **Certification:** - Aerospace quality certification - Full material traceability - Nadcap accreditation for special processes - Customer-specific approvals - Regular quality system audits --- #### **11. Comparison with Similar Tempers** | Property | 8090-T852 | 8090-T851 | 7075-T7351 | |----------|------------|------------|-------------| | Tensile Strength (MPa) | 430-490 | 450-510 | 400-460 | | Yield Strength (MPa) | 320-380 | 350-410 | 310-370 | | Stress Corrosion Resistance | Excellent | Good | Good | | Density (g/cm³) | 2.54 | 2.54 | 2.81 | | Specific Strength | Excellent | Excellent | Good | --- #### **Conclusion** Aluminum 8090-T852 alloy represents an optimized temper condition specifically developed for plate applications requiring excellent stress corrosion cracking resistance combined with good strength and damage tolerance. The T852 treatment, incorporating stress relief by compression followed by artificial aging, provides superior corrosion resistance properties that make it particularly suitable for critical aircraft structures exposed to aggressive environments. The combination of lithium-induced density reduction, improved stiffness, and excellent stress corrosion cracking resistance offers significant advantages over conventional aluminum alloys for weight-critical aerospace applications where reliability and durability are paramount. While requiring specialized processing and careful attention to manufacturing techniques, 8090-T852 has proven its capability in numerous aerospace applications where performance in corrosive environments is essential. The alloy's consistent performance in plate forms continues to make it a valuable choice for advanced aerospace engineering requirements demanding superior corrosion resistance.

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 2261 gallon liquid totes Special package is available on request.