7085 Aluminum alloy,Aluminum 7085 alloy，E FORU

### **7085 Aluminum Alloy: Advanced High-Strength Aerospace Alloy** **7085 Aluminum Alloy** is a premium, high-strength aluminum-zinc-magnesium-copper alloy from the 7xxx series, specifically developed for aerospace applications requiring exceptional combination of high strength, superior toughness, and excellent corrosion resistance in thick sections. This alloy represents significant advancements in aluminum metallurgy for next-generation aircraft structures. --- #### **1. Chemical Composition** | Element | Content (%) (Typical) | Role in the Alloy | | :--- | :--- | :--- | | **Zinc (Zn)** | 7.0 - 8.0 | Primary strengthening element through formation of MgZn₂ precipitates | | **Magnesium (Mg)** | 1.2 - 1.8 | Enhances strength and stress corrosion resistance | | **Copper (Cu)** | 1.3 - 2.0 | Improves strength and stress corrosion cracking resistance | | **Zirconium (Zr)** | 0.08 - 0.15 | Controls grain structure and inhibits recrystallization | | **Iron (Fe)** | ≤ 0.08 | Tightly controlled impurity for improved toughness | | **Silicon (Si)** | ≤ 0.06 | Tightly controlled impurity for improved ductility | | **Manganese (Mn)** | ≤ 0.04 | - | | **Chromium (Cr)** | ≤ 0.04 | - | | **Titanium (Ti)** | ≤ 0.06 | - | | **Other Elements** | ≤ 0.05 each; ≤ 0.15 total | - | | **Aluminum (Al)** | Balance | Base metal | --- #### **2. Physical Properties** | Property | Value / Description | | :--- | :--- | | **Density** | 2.82 g/cm³ (0.102 lb/in³) | | **Melting Range** | 475°C - 638°C (887°F - 1180°F) | | **Electrical Conductivity** | 38-42% IACS | | **Thermal Conductivity** | 130-145 W/m·K | | **Coefficient of Thermal Expansion** | 23.5 × 10⁻⁶/°C (20-100°C) | | **Modulus of Elasticity** | 71 GPa (10.3 × 10⁶ psi) | --- #### **3. Mechanical Properties (Typical for T7452 Temper)** | Property | Typical Value | | :--- | :--- | | **Tensile Ultimate Strength** | 510 - 550 MPa (74 - 80 ksi) | | **Tensile Yield Strength (0.2% Offset)** | 440 - 480 MPa (64 - 70 ksi) | | **Elongation** | 10-12% | | **Compression Yield Strength** | 430 - 470 MPa (62 - 68 ksi) | | **Shear Strength** | 290 - 320 MPa (42 - 46 ksi) | | **Fatigue Strength** | 160 - 180 MPa (23 - 26 ksi) | | **Fracture Toughness** | Excellent | --- #### **4. Product Applications** **7085 Aluminum Alloy** is extensively used in critical aerospace applications: * **Aerospace Structures:** * Aircraft wing spars and ribs * Bulkheads and fuselage frames * Upper wing panels * Stabilizer components * Large structural forgings * **Commercial Aircraft:** * Primary structural components for large commercial aircraft * Wing attachment fittings * Fuselage frames * **Military Applications:** * Military transport aircraft structures * Defense system components * **Space Applications:** * Space launch vehicle structures * Satellite components --- #### **5. International Standards** | Standard Body | Designation | Specification | | :--- | :--- | :--- | | **Aluminum Association** | 7085 | AA Teal Sheets | | **ASTM International** | 7085 | ASTM B247 / B209 | | **Aerospace (AMS)** | 7085 | AMS 4331 | | **European Norm** | EN AW-7085 | EN 586-2 / EN 485-2 | | **Unified Numbering System** | A97085 | UNS Registry | --- #### **6. Key Characteristics** **Advantages:** * **Excellent combination of strength and toughness** in thick sections * **Superior stress corrosion cracking resistance** * **Good exfoliation corrosion resistance** * High strength-to-weight ratio * Excellent fatigue performance * Good damage tolerance * Consistent properties in thick sections **Limitations:** * Requires precise heat treatment control * Higher cost than conventional aluminum alloys * Limited formability in aged condition * Requires specialized manufacturing processes --- #### **7. Manufacturing Considerations** * **Forging:** Excellent forgeability for large structural components * **Machining:** Good machinability with proper tooling and techniques * **Heat Treatment:** Requires precise control of solution treatment and aging parameters * **Welding:** Limited weldability; requires specialized techniques * **Surface Treatment:** Good for anodizing and other protective coatings --- #### **8. Special Features** **7085 Aluminum Alloy** offers several distinctive advantages for aerospace applications: * **Thick Section Performance:** Maintains consistent properties in sections up to 150-200 mm * **Advanced Metallurgy:** Optimized composition for improved quench sensitivity * **Damage Tolerance:** Excellent fracture toughness and fatigue crack growth resistance * **Corrosion Performance:** Superior stress corrosion cracking resistance compared to traditional 7xxx alloys **Heat Treatment Characteristics:** * Solution treatment temperature: 465-475°C * Aging treatment: Two-step aging process for optimal properties * Quench rate sensitivity: Lower than traditional 7xxx alloys --- #### **9. Performance in Service** * **Fatigue Performance:** Excellent resistance to cyclic loading * **Corrosion Resistance:** Good performance in aerospace environments * **Temperature Stability:** Maintains properties at elevated temperatures * **Long-term Reliability:** Proven performance in commercial aircraft service **7085 Aluminum Alloy** represents a significant advancement in aluminum alloy technology for aerospace structures, particularly addressing the challenges of manufacturing large, thick-section components with consistent properties. Its development was driven by the needs of next-generation aircraft for materials that offer improved combinations of strength, toughness, and corrosion resistance in heavy structural sections. The alloy has become a preferred choice for critical aircraft components where reliability, damage tolerance, and long-term performance are essential requirements.

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 2174 gallon liquid totes Special package is available on request.