7065 Aluminum alloy,Aluminum 7065 alloy，E FORU

### **7065 Aluminum Alloy: High-Strength Aerospace Alloy** **7065 Aluminum Alloy** is a high-strength, heat-treatable aluminum-zinc-magnesium-copper alloy from the 7xxx series, specifically engineered for aerospace and defense applications requiring an optimal balance of very high strength, good fracture toughness, and excellent fatigue resistance. This alloy offers superior performance characteristics for critical structural components where weight reduction and reliability are paramount. --- #### **1. Chemical Composition** | Element | Content (%) (Typical) | Role in the Alloy | | :--- | :--- | :--- | | **Zinc (Zn)** | 7.3 - 8.3 | Primary strengthening element through formation of MgZn₂ precipitates | | **Magnesium (Mg)** | 1.5 - 2.2 | Enhances strength and work hardening characteristics | | **Copper (Cu)** | 1.5 - 2.1 | Improves strength and stress corrosion cracking resistance | | **Zirconium (Zr)** | 0.10 - 0.18 | Controls grain structure and inhibits recrystallization | | **Iron (Fe)** | ≤ 0.12 | Impurity - tightly controlled for improved toughness | | **Silicon (Si)** | ≤ 0.10 | Impurity - tightly controlled for improved ductility | | **Manganese (Mn)** | ≤ 0.08 | - | | **Chromium (Cr)** | ≤ 0.04 | - | | **Titanium (Ti)** | ≤ 0.05 | - | | **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** | 38-43% IACS | | **Thermal Conductivity** | 125-140 W/m·K | | **Coefficient of Thermal Expansion** | 23.6 × 10⁻⁶/°C (20-100°C) | | **Modulus of Elasticity** | 71 GPa (10.3 × 10⁶ psi) | --- #### **3. Mechanical Properties (Typical for T7451 Temper)** | Property | Typical Value | | :--- | :--- | | **Tensile Ultimate Strength** | 560 - 600 MPa (81 - 87 ksi) | | **Tensile Yield Strength (0.2% Offset)** | 500 - 540 MPa (73 - 78 ksi) | | **Elongation** | 10-13% | | **Compression Yield Strength** | 490 - 530 MPa (71 - 77 ksi) | | **Shear Strength** | 320 - 350 MPa (46 - 51 ksi) | | **Fatigue Strength** | 175 - 195 MPa (25 - 28 ksi) | | **Fracture Toughness (K1C)** | 28-32 MPa·√m | --- #### **4. Product Applications** **7065 Aluminum Alloy** is extensively used in critical aerospace and defense applications: * **Aerospace Structures:** * Upper wing skins and covers * Fuselage frames and bulkheads * Wing ribs and spar chords * Stabilizer components * Aircraft landing gear components * **Military Applications:** * Fighter aircraft structures * Military helicopter components * Missile and rocket structures * Armored vehicle components * **High-Performance Applications:** * Racing vehicle chassis components * High-performance bicycle frames * Competition sports equipment --- #### **5. International Standards** | Standard Body | Designation | Specification | | :--- | :--- | :--- | | **Aluminum Association** | 7065 | AA Teal Sheets | | **ASTM International** | 7065 | ASTM B209 / B221 | | **Aerospace (AMS)** | 7065 | AMS 4338 | | **European Norm** | EN AW-7065 | EN 485-2 / EN 755-2 | | **Unified Numbering System** | A97065 | UNS Registry | --- #### **6. Key Characteristics** **Advantages:** * Very high strength-to-weight ratio * Excellent fatigue performance * Good corrosion resistance for high-strength alloy * Superior fracture toughness * Good stress corrosion cracking resistance * Excellent damage tolerance * Good machinability in heat-treated condition **Limitations:** * Requires precise heat treatment control * Higher cost than conventional aluminum alloys * Limited formability in fully aged condition * Requires specialized welding techniques **Heat Treatment:** Typical heat treatment includes: * Solution treatment at 470-480°C * Rapid quenching * Artificial aging to specific tempers (T74, T7451, T7651) --- #### **7. Manufacturing Considerations** * **Machining:** Excellent machinability in aged condition with proper tooling * **Forming:** Best formed in annealed or freshly quenched condition * **Welding:** Requires specialized techniques; friction stir welding preferred * **Corrosion Protection:** Requires appropriate surface protection for severe environments * **Heat Treatment:** Demands precise control of time-temperature parameters --- #### **8. Special Features** **7065 Aluminum Alloy** offers several distinctive advantages: * **Optimized Strength-Toughness Balance:** Carefully engineered composition provides an exceptional balance between high strength and good fracture toughness * **Superior Fatigue Resistance:** Excellent performance under cyclic loading conditions * **Versatile Product Forms:** Available in sheet, plate, and extruded forms * **Consistent Performance:** Reliable mechanical properties across different product sections * **Advanced Microstructure Control:** Zirconium addition provides superior grain structure control The alloy is particularly valued for applications requiring both high static strength and excellent damage tolerance. Its performance characteristics make it suitable for safety-critical applications where component failure is not an option. **7065 Aluminum Alloy** represents a significant advancement in high-strength aluminum alloy technology, providing an outstanding combination of mechanical properties for the most demanding aerospace and defense applications. The alloy continues to be developed and optimized for next-generation aircraft and aerospace systems where performance, reliability, and weight reduction are critical design parameters.

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 2158 gallon liquid totes Special package is available on request.