7475-T61 Aluminum alloy,Aluminum 7475-T61 alloy，E FORU

### **Product Introduction: 7475-T61 Aluminum Alloy** **7475-T61** is a high-strength aluminum alloy from the Al-Zn-Mg-Cu (7xxx) series, specifically developed for aerospace applications requiring exceptional fracture toughness and fatigue resistance. The "T61" temper indicates that the material has been solution heat-treated and artificially aged to achieve an optimal balance of strength and corrosion resistance. This alloy is particularly valued for its superior damage tolerance characteristics compared to other 7xxx series alloys. --- ### **1. Chemical Composition** The chemical composition of 7475-T61 is strictly controlled to ensure consistent mechanical properties and performance. **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 high fracture toughness.* --- ### **2. Physical Properties** | Property | Value | |----------|-------| | **Density** | 2.80 g/cm³ | | **Melting Range** | 475-635°C | | **Thermal Conductivity** | 130 W/m·K | | **Electrical Conductivity** | 33-40% IACS | | **Modulus of Elasticity** | 71 GPa | | **Coefficient of Thermal Expansion** | 23.4 × 10⁻⁶/°C | --- ### **3. Mechanical Properties** **Typical Mechanical Properties (at Room Temperature)** | Property | Value | |----------|-------| | **Tensile Ultimate Strength** | 524-552 MPa | | **Tensile Yield Strength** | 455-483 MPa | | **Compressive Yield Strength** | 455 MPa | | **Elongation at Break** | 11-13% | | **Poisson's Ratio** | 0.33 | | **Fatigue Strength** | 160 MPa | *Key Advantage: 7475-T61 offers approximately 25% higher fracture toughness than 7075-T6 while maintaining similar strength levels.* --- ### **4. International Standards** **Primary Specifications:** - **AMS 4200**: Aluminum Alloy 7475-T61 Plate and Sheet - **AMS 4201**: Aluminum Alloy 7475-T761 Plate and Sheet - **ASTM B209**: Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate **Additional Standards:** - **ISO 6361**: Wrought Aluminum and Aluminum Alloy Sheets, Strips and Plates - **EN 485**: Aluminum and Aluminum Alloys - Sheet, Strip and Plate --- ### **5. Product Applications** **Aerospace Applications:** - **Aircraft Structures**: Wing skins, fuselage panels, bulkheads - **Space Vehicles**: Fuel tanks, structural components - **Military Aircraft**: Critical load-bearing components - **Commercial Aircraft**: Upper wing surfaces, stringers **Other Applications:** - High-performance sporting equipment - Competition bicycle frames - 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 **Limitations:** - Lower corrosion resistance compared to 2xxx series alloys - Requires protective coatings for severe environments - Higher cost than standard 7xxx series alloys --- ### **7. Processing Characteristics** **Machining:** - Good machinability in aged condition - Recommended tools: Carbide or high-speed steel - Proper cooling required for optimal results **Heat Treatment:** - Solution heat treatment: 470-490°C - Aging temperature: 120-135°C - Quenching rate critical for properties **Forming:** - Good formability in annealed condition - Can be formed in T61 temper with proper techniques --- ### **Conclusion** 7475-T61 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 make it particularly valuable for aerospace applications where safety and reliability are paramount. The strict chemical controls and specialized T61 heat treatment ensure consistent performance in the most demanding applications, establishing 7475-T61 as a material of choice for critical structural components in advanced aerospace systems.

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 2214 gallon liquid totes Special package is available on request.