7050-T7651 Aluminum alloy,Aluminum 7050-T7651 alloy，E FORU

### **7050-T7651 Aluminum Alloy: High-Strength Corrosion Resistant Aerospace Plate** **7050-T7651 Aluminum Alloy** is a high-strength, heat-treatable aluminum-zinc-magnesium-copper alloy specifically designed for aerospace applications requiring superior corrosion resistance combined with high strength. The T7651 temper represents an optimized over-aged condition that provides exceptional resistance to exfoliation corrosion and stress corrosion cracking (SCC) while maintaining excellent mechanical properties. --- #### **1. Chemical Composition** | Element | Content (%) (Typical) | Role in the Alloy | | :--- | :--- | :--- | | **Zinc (Zn)** | 5.7 - 6.7 | Primary strengthening element through formation of MgZn₂ precipitates | | **Magnesium (Mg)** | 1.8 - 2.7 | Enhances strength and work hardening characteristics | | **Copper (Cu)** | 2.0 - 2.6 | Improves strength and stress corrosion cracking resistance | | **Zirconium (Zr)** | 0.08 - 0.15 | Controls grain structure and inhibits recrystallization | | **Iron (Fe)** | ≤ 0.15 | Impurity - controlled for improved toughness | | **Silicon (Si)** | ≤ 0.12 | Impurity - controlled for improved ductility | | **Manganese (Mn)** | ≤ 0.10 | - | | **Titanium (Ti)** | ≤ 0.06 | - | | **Other Elements** | ≤ 0.05 each; ≤ 0.15 total | - | | **Aluminum (Al)** | Balance | Base metal | --- #### **2. Understanding the T7651 Temper** The temper designation indicates specific processing: * **T7**: Solution Heat-Treated and then Artificially Over-Aged * **65**: Indicates the product has been stress-relieved by stretching (1.5-3% permanent set) * **1**: Denotes the final aging treatment to achieve the T76 condition **Key Characteristics:** * **Enhanced corrosion resistance** compared to T74 and T7451 tempers * **Excellent exfoliation corrosion resistance** * **Good stress corrosion cracking (SCC) resistance** * Maintains **high strength** while offering superior corrosion performance --- #### **3. Physical Properties** | Property | Value / Description | | :--- | :--- | | **Density** | 2.83 g/cm³ (0.102 lb/in³) | | **Melting Range** | 490°C - 635°C (914°F - 1175°F) | | **Electrical Conductivity** | 40-44% IACS | | **Thermal Conductivity** | 130-140 W/m·K | | **Coefficient of Thermal Expansion** | 23.4 × 10⁻⁶/°C (20-100°C) | | **Modulus of Elasticity** | 71 GPa (10.3 × 10⁶ psi) | --- #### **4. Mechanical Properties (Typical)** | Property | Typical Value | | :--- | :--- | | **Tensile Ultimate Strength** | 510 - 540 MPa (74 - 78 ksi) | | **Tensile Yield Strength (0.2% Offset)** | 440 - 480 MPa (64 - 70 ksi) | | **Elongation** | 10-12% | | **Compression Yield Strength** | 440 - 480 MPa (64 - 70 ksi) | | **Shear Strength** | 290 - 310 MPa (42 - 45 ksi) | | **Fatigue Strength** | 160 - 180 MPa (23 - 26 ksi) | | **Fracture Toughness** | Excellent | --- #### **5. Product Applications** **7050-T7651** is used in critical aerospace applications where corrosion resistance is paramount: * **Aircraft Structures:** * Upper wing skins and planks * Fuselage frames and bulkheads * Wing ribs and spars * Stabilizer components * **Marine Applications:** * Marine aircraft components * Ship and boat structures * **Defense Applications:** * Military aircraft structural components * Missile and rocket structures --- #### **6. International Standards** | Standard Body | Designation | Specification | | :--- | :--- | :--- | | **Aluminum Association** | 7050-T7651 | AA Teal Sheets | | **ASTM International** | 7050-T7651 | ASTM B209 | | **Aerospace (AMS)** | 7050-T7651 | AMS 4050H | | **European Norm** | EN AW-7050 T7651 | EN 485-2 | | **Unified Numbering System** | A97050 | UNS Registry | --- #### **7. Key Characteristics** **Advantages:** * Excellent exfoliation corrosion resistance * Superior stress corrosion cracking resistance * High strength-to-weight ratio * Good fracture toughness * Suitable for thick sections * Excellent fatigue performance **Limitations:** * Slightly lower strength than T6 tempers * Requires proper heat treatment facilities * Higher cost than standard alloys **Heat Treatment:** The T7651 temper involves: * Solution treatment at 477-488°C * Quenching * Stress-relieving by stretching (1.5-3%) * Artificial aging to T76 condition --- #### **8. Manufacturing Considerations** * **Machining:** Good machinability in aged condition * **Forming:** Good formability in solution heat-treated condition * **Welding:** Not generally recommended for fusion welding * **Corrosion Protection:** Excellent inherent corrosion resistance **7050-T7651** represents one of the most corrosion-resistant high-strength aluminum alloys available for aerospace applications, offering the optimal combination of mechanical properties and superior corrosion resistance for critical structural components exposed to severe environments.

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 2152 gallon liquid totes Special package is available on request.