7185 Aluminum alloy,Aluminum 7185 alloy，E FORU

### **7185 Aluminum Alloy: Advanced High-Strength Aerospace Alloy** **7185 Aluminum Alloy** is a high-strength, heat-treatable aluminum-zinc-magnesium-copper alloy developed for aerospace applications requiring exceptional strength, good toughness, and excellent corrosion resistance. This alloy represents significant advancements in aluminum alloy technology, offering improved combinations of properties 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)** | 1.8 - 2.6 | Enhances strength and age-hardening response | | **Copper (Cu)** | 1.6 - 2.2 | Improves strength and stress corrosion cracking resistance | | **Zirconium (Zr)** | 0.08 - 0.15 | Controls grain structure and inhibits recrystallization | | **Iron (Fe)** | ≤ 0.12 | Tightly controlled impurity for improved toughness | | **Silicon (Si)** | ≤ 0.10 | Tightly controlled impurity for improved ductility | | **Manganese (Mn)** | ≤ 0.08 | - | | **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** | 2.83 g/cm³ (0.102 lb/in³) | | **Melting Range** | 475°C - 638°C (887°F - 1180°F) | | **Electrical Conductivity** | 36-40% IACS | | **Thermal Conductivity** | 125-140 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 T7751 Temper)** | Property | Typical Value | | :--- | :--- | | **Tensile Ultimate Strength** | 580 - 620 MPa (84 - 90 ksi) | | **Tensile Yield Strength (0.2% Offset)** | 530 - 570 MPa (77 - 83 ksi) | | **Elongation** | 9-12% | | **Compression Yield Strength** | 520 - 560 MPa (75 - 81 ksi) | | **Shear Strength** | 330 - 360 MPa (48 - 52 ksi) | | **Fatigue Strength** | 180 - 200 MPa (26 - 29 ksi) | | **Fracture Toughness** | Excellent | --- #### **4. Product Applications** **7185 Aluminum Alloy** is used in the most demanding aerospace applications: * **Aircraft Structures:** * Upper wing skins and covers * Fuselage frames and bulkheads * Wing ribs and spars * Stabilizer components * Primary structural members * **Military Applications:** * Fighter aircraft structural components * Military transport structures * Missile and rocket components * **Space Applications:** * Launch vehicle structures * Spacecraft components * Satellite structures * **Commercial Aviation:** * Next-generation commercial aircraft * Wing box components * Fuselage stringers --- #### **5. International Standards** | Standard Body | Designation | Specification | | :--- | :--- | :--- | | **Aluminum Association** | 7185 | AA Teal Sheets | | **ASTM International** | 7185 | ASTM B209 | | **Aerospace (AMS)** | 7185 | AMS 4340 | | **European Norm** | EN AW-7185 | EN 485-2 | | **Unified Numbering System** | A97185 | UNS Registry | --- #### **6. Key Characteristics** **Advantages:** * **Exceptional strength-to-weight ratio** * **Excellent fatigue performance** * **Good corrosion resistance** * **Superior fracture toughness** * **Good stress corrosion cracking resistance** * **Excellent damage tolerance** * **Enhanced thermal stability** **Limitations:** * Higher cost than conventional alloys * Requires precise heat treatment control * Limited formability in aged condition * Requires specialized manufacturing processes --- #### **7. Manufacturing Considerations** * **Machining:** Good machinability with proper tooling * **Forming:** Best formed in annealed condition before heat treatment * **Welding:** Requires specialized techniques * **Heat Treatment:** Precise control of aging parameters essential * **Surface Treatment:** Excellent for anodizing and coating --- #### **8. Special Features** **7185 Aluminum Alloy** offers advanced performance characteristics: * **Strength Level:** Among the highest strength aluminum alloys available * **Corrosion Performance:** Excellent exfoliation and stress corrosion resistance * **Property Balance:** Optimal combination of strength and toughness * **Quality Consistency:** Reliable mechanical properties **Comparison with 7150 Alloy:** - Higher zinc content for increased strength - Maintains good corrosion resistance - Improved damage tolerance - Enhanced thermal stability --- #### **9. Performance in Service** * **Fatigue Performance:** Excellent for aircraft structural applications * **Corrosion Resistance:** Superior in aerospace environments * **Damage Tolerance:** Good resistance to crack propagation * **Temperature Capability:** Suitable for aerospace service conditions **7185 Aluminum Alloy** represents a significant advancement in aerospace aluminum technology, providing exceptional strength combined with good corrosion resistance for critical aircraft structures. The alloy's optimized composition and processing ensure consistent performance and reliability in demanding aerospace applications, making it a preferred choice for next-generation aircraft designs where maximum strength, durability, and safety are paramount considerations.

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 2201 gallon liquid totes Special package is available on request.