7475-T651 Aluminum alloy,Aluminum 7475-T651 alloy，E FORU

### **Product Introduction: 7475-T651 Aluminum Alloy** **7475-T651** is a premium high-strength aluminum alloy from the Al-Zn-Mg-Cu (7xxx) series, specifically designed for aerospace applications requiring exceptional fracture toughness and fatigue resistance. The "T651" temper indicates the material has undergone solution heat treatment, stress-relieving by stretching, and artificial aging to achieve optimal mechanical properties and dimensional stability. This alloy offers superior damage tolerance compared to other 7xxx series alloys. --- ### **1. Chemical Composition** **Chemical Composition (% by Weight)** | Element | Content | |---------|----------| | **Zinc (Zn)** | 5.2 - 6.2 | | **Magnesium (Mg)** | 1.9 - 2.6 | | **Copper (Cu)** | 1.2 - 1.9 | | **Chromium (Cr)** | 0.18 - 0.25 | | **Silicon (Si)** | ≤ 0.10 | | **Iron (Fe)** | ≤ 0.12 | | **Manganese (Mn)** | ≤ 0.06 | | **Titanium (Ti)** | ≤ 0.05 | | **Other Elements** | ≤ 0.05 each | | **Aluminum (Al)** | Balance | *Note: The strict control of iron and silicon impurities is crucial for achieving the alloy's characteristic high fracture toughness and fatigue resistance.* --- ### **2. Physical Properties** | Property | Metric Value | Imperial Value | |----------|--------------|----------------| | **Density** | 2.80 g/cm³ | 0.101 lb/in³ | | **Melting Range** | 475-635°C | 887-1175°F | | **Thermal Conductivity** | 130 W/m·K | - | | **Electrical Conductivity** | 33-40% IACS | - | | **Modulus of Elasticity** | 71 GPa | 10.3 × 10⁶ psi | | **Coefficient of Thermal Expansion** | 23.4 × 10⁻⁶/°C | 13.0 × 10⁻⁶/°F | --- ### **3. Mechanical Properties** **Typical Mechanical Properties (at Room Temperature)** | Property | Metric Value | Imperial Value | |----------|--------------|----------------| | **Tensile Ultimate Strength** | 524-552 MPa | 76-80 ksi | | **Tensile Yield Strength** | 455-483 MPa | 66-70 ksi | | **Compressive Yield Strength** | 455 MPa | 66 ksi | | **Elongation at Break** | 11-13% | 11-13% | | **Shear Strength** | 290 MPa | 42 ksi | | **Fatigue Strength** | 160 MPa | 23 ksi | | **Fracture Toughness (K_Ic)** | 29-33 MPa√m | 26-30 ksi√in | *Key Advantage: 7475-T651 offers approximately 25-30% higher fracture toughness than 7075-T651 while maintaining similar strength levels.* --- ### **4. International Standards** **Primary Specifications:** - **AMS 4200**: Aluminum Alloy 7475-T651 Plate and Sheet - **AMS 4201**: Aluminum Alloy 7475-T7651 Plate and Sheet - **ASTM B209**: Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate - **ASTM B247**: Standard Specification for Aluminum and Aluminum-Alloy Die Forgings, Hand Forgings, and Rolled Ring Forgings **Additional Standards:** - **ISO 6361**: Wrought Aluminum and Aluminum Alloy Sheets, Strips and Plates - **EN 485**: Aluminum and Aluminum Alloys - Sheet, Strip and Plate - **MIL-DTL-897E**: Military Specification for Aluminum Alloy 7475 Plate --- ### **5. Product Applications** **Aerospace Applications:** - **Aircraft Structures**: Upper and lower wing skins, fuselage panels, bulkheads - **Space Vehicles**: Launch vehicle fuel tanks, satellite structures - **Military Aircraft**: Fighter aircraft components, helicopter structural parts - **Commercial Aircraft**: Boeing and Airbus critical structural components **Defense Applications:** - Armored vehicle components - Missile structural parts - Military bridge components **Other Applications:** - High-performance sporting equipment - Competition bicycle frames and components - Precision machinery components - Marine structures requiring high strength-to-weight ratio --- ### **6. Key Characteristics & Advantages** **Advantages:** 1. **Exceptional Fracture Toughness**: Superior crack propagation resistance 2. **High Strength-to-Weight Ratio**: Excellent mechanical properties 3. **Good Fatigue Resistance**: Suitable for cyclic loading applications 4. **Excellent Stress Corrosion Resistance**: Reliable performance in demanding environments 5. **Superior Damage Tolerance**: Ideal for critical aerospace structures 6. **Good Thermal Stability**: Maintains properties at elevated temperatures 7. **Excellent Machinability**: Good machining characteristics in aged condition **Limitations:** - Lower corrosion resistance compared to 2xxx series alloys - Requires protective coatings for severe environments - Higher cost than standard 7xxx series alloys - Limited weldability compared to other aluminum alloys --- ### **7. Processing Characteristics** **Machining:** - Excellent machinability in T651 condition - Recommended tools: Carbide or high-speed steel with positive rake angles - Proper cooling required for optimal surface finish - Chip formation: Generally produces discontinuous chips **Heat Treatment:** - Solution heat treatment: 470-490°C (878-914°F) - Aging temperature: 120-135°C (248-275°F) - Quenching rate critical for optimal properties - Stress relief: 1.5-3% permanent stretch after solution treatment **Forming:** - Good formability in annealed condition - Can be formed in T651 temper with proper techniques - Recommended forming temperature: Room temperature to 150°C --- ### **8. Quality Assurance** **Testing Requirements:** - Ultrasonic inspection per ASTM E114 - Fracture toughness testing per ASTM E399 - Fatigue testing per ASTM E466 - Corrosion resistance testing per ASTM G34, G47 **Certification:** - Mill certification to applicable standards - Third-party verification available - Traceability to original heat lot required --- ### **Conclusion** 7475-T651 aluminum alloy represents the premium category of aluminum materials, offering an outstanding combination of high strength, exceptional fracture toughness, and good corrosion resistance. Its superior damage tolerance characteristics, combined with the stability provided by the T651 temper, make it particularly valuable for aerospace applications where safety, reliability, and dimensional stability are paramount. The strict chemical controls and specialized T651 heat treatment ensure consistent performance in the most demanding applications, establishing 7475-T651 as a material of choice for critical structural components in advanced aerospace systems, defense applications, and high-performance sporting equipment.

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 2215 gallon liquid totes Special package is available on request.