7040 Aluminum alloy,Aluminum 7040 alloy，E FORU

### **Aluminum 7040 Alloy (EN AW-7040) - Product Introduction** **Aluminum 7040** is a high-strength, heat-treatable aluminum-zinc-magnesium-copper alloy specifically developed for aerospace applications requiring an excellent combination of strength, toughness, and corrosion resistance. This advanced 7xxx series alloy offers improved stress corrosion cracking resistance compared to earlier high-strength aluminum alloys while maintaining excellent mechanical properties. --- #### **1. Chemical Composition** The chemical composition is balanced for optimal performance: | Element | Content (%) (Typical) | Standard Range | |---|---|---| | **Aluminum (Al)** | Balance | Balance | | **Zinc (Zn)** | 5.7 - 6.7 | 5.7 - 6.7 | | **Magnesium (Mg)** | 1.8 - 2.7 | 1.8 - 2.7 | | **Copper (Cu)** | 1.2 - 1.9 | 1.2 - 1.9 | | **Zirconium (Zr)** | 0.10 - 0.16 | 0.10 - 0.16 | | **Manganese (Mn)** | ≤ 0.10 | ≤ 0.10 | | **Chromium (Cr)** | ≤ 0.05 | ≤ 0.05 | | **Iron (Fe)** | ≤ 0.15 | ≤ 0.15 | | **Silicon (Si)** | ≤ 0.12 | ≤ 0.12 | | **Titanium (Ti)** | ≤ 0.06 | ≤ 0.06 | | **Others (Each)** | ≤ 0.05 | ≤ 0.05 | | **Others (Total)** | ≤ 0.15 | ≤ 0.15 | --- #### **2. Physical Properties** Aluminum 7040 exhibits excellent physical properties for aerospace applications: | Property | Metric Value | Imperial Value | |---|---|---| | **Density** | 2.81 g/cm³ | 0.101 lb/in³ | | **Melting Range** | 475 - 635 °C | 887 - 1175 °F | | **Electrical Conductivity** | 38-42 % IACS (T7451 Temper) | 38-42 % IACS | | **Thermal Conductivity** | 145-160 W/m·K | 1005-1110 BTU·in/(hr·ft²·°F) | | **Coefficient of Thermal Expansion** | 23.6 × 10⁻⁶/K | 13.1 × 10⁻⁶/°F | | **Modulus of Elasticity** | 71 GPa | 10,300 ksi | | **Shear Modulus** | 27 GPa | 3,920 ksi | --- #### **3. Mechanical Properties** Typical mechanical properties for common tempers: | Temper | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) | |---|---|---|---|---| | **T7651** | 510-560 | 440-490 | 10-14 | 140-150 | | **T7451** | 490-540 | 420-470 | 11-15 | 135-145 | | **T7351** | 470-520 | 400-450 | 12-16 | 130-140 | --- #### **4. International Standards** Aluminum 7040 complies with the following international standards: * **AMS:** **AMS 4104**, **AMS 4330** (Aerospace Material Specification) * **ASTM:** **ASTM B209**, **ASTM B247** * **EN:** **EN AW-7040** (3.4145) * **ISO:** **AlZn6Mg2Cu** under ISO 209 * **UNS:** **A97040** --- #### **5. Product Applications** Aluminum 7040 is primarily used in critical aerospace applications: * **Aircraft Structures:** Upper wing skins, fuselage frames, stringers * **Military Aircraft:** Fighter aircraft components, military transport structures * **Helicopter Components:** Rotor hubs, transmission housings * **Spacecraft Structures:** Satellite frames, launch vehicle components * **Commercial Aviation:** Airframe components for commercial aircraft * **Defense Applications:** Military vehicle components, defense systems * **High-Performance Structures:** Critical structural components * **Transportation:** Railway and automotive structural applications --- #### **6. Key Advantages & Characteristics** * **High Strength-to-Weight Ratio:** Excellent mechanical properties with density advantage * **Superior Stress Corrosion Resistance:** Enhanced SCC resistance compared to 7075 * **Good Fracture Toughness:** Excellent damage tolerance characteristics * **Fatigue Performance:** Superior resistance to cyclic loading * **Good Exfoliation Corrosion Resistance:** Improved corrosion performance * **Heat Treatable:** Excellent response to complex aging treatments * **Weldability:** Can be welded using specialized techniques * **Cryogenic Capability:** Maintains properties at low temperatures **Heat Treatment Characteristics:** - Solution treatment: 465-475°C (870-885°F) - T74-type tempers provide optimal strength-corrosion balance - T76 temper offers improved exfoliation corrosion resistance - Complex aging sequences for property optimization **Corrosion Performance:** - Superior stress corrosion cracking resistance - Good exfoliation corrosion resistance - Excellent performance in aerospace environments - Suitable for marine and industrial atmospheres **Manufacturing Characteristics:** - Good forgeability and machinability - Suitable for complex structural components - Can be joined using friction stir welding - Requires controlled processing parameters --- **Quality Assurance:** - Stringent chemical composition controls - Comprehensive mechanical testing requirements - Advanced non-destructive testing - Full traceability from raw material to finished part - Regular audit and certification requirements **Conclusion:** Aluminum 7040 represents a significant advancement in high-strength aluminum alloy technology, offering an optimal balance of mechanical properties, corrosion resistance, and damage tolerance. Its development specifically addresses the needs of modern aerospace applications where reliability, safety, and performance are paramount. The alloy's superior stress corrosion cracking resistance combined with excellent strength and toughness characteristics make it particularly valuable for critical airframe components and structural applications. While requiring careful processing and quality control, 7040 delivers the performance and reliability demanded by the aerospace industry, establishing it as a preferred material for next-generation aircraft structures and demanding engineering applications.

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 2137 gallon liquid totes Special package is available on request.