7075-T6; 7075-T651 Aluminum alloy,Aluminum 7075-T6; 7075-T651 alloy，E FORU

### **7075-T6 / 7075-T651 Aluminum Alloy: Premium High-Strength Aerospace Alloy** **7075-T6 and 7075-T651** represent the peak-aged tempers of one of the strongest commercially available aluminum alloys. These tempers provide exceptional strength-to-weight ratio, making 7075 the preferred choice for highly stressed structural applications in aerospace, defense, and high-performance industries. --- #### **1. Chemical Composition** | Element | Content (%) (Typical) | Role in the Alloy | | :--- | :--- | :--- | | **Zinc (Zn)** | 5.1 - 6.1 | Primary strengthening element through formation of MgZn₂ precipitates | | **Magnesium (Mg)** | 2.1 - 2.9 | Enhances strength and work hardening characteristics | | **Copper (Cu)** | 1.2 - 2.0 | Improves strength and stress corrosion cracking resistance | | **Chromium (Cr)** | 0.18 - 0.28 | Controls grain structure and inhibits recrystallization | | **Iron (Fe)** | ≤ 0.50 | Impurity - controlled for improved consistency | | **Silicon (Si)** | ≤ 0.40 | Impurity - controlled for improved ductility | | **Manganese (Mn)** | ≤ 0.30 | - | | **Titanium (Ti)** | ≤ 0.20 | - | | **Other Elements** | ≤ 0.05 each; ≤ 0.15 total | - | | **Aluminum (Al)** | Balance | Base metal | --- #### **2. Understanding the T6 and T651 Tempers** **T6 Temper:** - Solution heat-treated and artificially aged to peak strength - Maximum strength condition - May contain residual stresses from quenching **T651 Temper:** - Solution heat-treated, stress-relieved by stretching (1-3% permanent set), and artificially aged - Reduced residual stresses - Improved dimensional stability for machining - Preferred for critical applications requiring precise dimensions --- #### **3. Physical Properties** | Property | Value / Description | | :--- | :--- | | **Density** | 2.81 g/cm³ (0.101 lb/in³) | | **Melting Range** | 477°C - 638°C (890°F - 1180°F) | | **Electrical Conductivity** | 33-38% IACS | | **Thermal Conductivity** | 130-150 W/m·K | | **Coefficient of Thermal Expansion** | 23.6 × 10⁻⁶/°C (20-100°C) | | **Modulus of Elasticity** | 71 GPa (10.3 × 10⁶ psi) | --- #### **4. Mechanical Properties (Typical)** | Property | T6 Temper | T651 Temper | | :--- | :--- | :--- | | **Tensile Ultimate Strength** | 510 - 570 MPa (74 - 83 ksi) | 500 - 560 MPa (73 - 81 ksi) | | **Tensile Yield Strength (0.2% Offset)** | 430 - 500 MPa (62 - 73 ksi) | 420 - 490 MPa (61 - 71 ksi) | | **Elongation** | 5-11% | 6-12% | | **Compression Yield Strength** | 430 - 500 MPa (62 - 73 ksi) | 420 - 490 MPa (61 - 71 ksi) | | **Shear Strength** | 290 - 330 MPa (42 - 48 ksi) | 280 - 320 MPa (41 - 46 ksi) | | **Fatigue Strength** | 150 - 180 MPa (22 - 26 ksi) | 145 - 175 MPa (21 - 25 ksi) | | **Brinell Hardness** | 135 - 150 HB | 130 - 145 HB | --- #### **5. Product Applications** **7075-T6/T651** is extensively used in critical high-stress applications: * **Aerospace Structures:** * Aircraft wing skins and spars * Fuselage frames and bulkheads * Landing gear components * Helicopter rotor components * Spacecraft structures * **Defense Applications:** * Military aircraft components * Armored vehicle parts * Missile and rocket components * Weapon systems * **High-Performance Applications:** * Racing vehicle chassis and suspension * High-performance bicycle frames * Mountain bike components * Sports equipment * **Industrial Applications:** * Precision machinery parts * Tooling plates and fixtures * Robotics components * High-stress structural members --- #### **6. International Standards** | Standard Body | Designation | Specification | | :--- | :--- | :--- | | **Aluminum Association** | 7075-T6 / 7075-T651 | AA Teal Sheets | | **ASTM International** | 7075-T6 / 7075-T651 | ASTM B209 / B211 | | **Aerospace (AMS)** | 7075-T6 | AMS 4045 | | **Aerospace (AMS)** | 7075-T651 | AMS 4050 | | **European Norm** | EN AW-7075 T6 / T651 | EN 485-2 / EN 754-2 | | **Unified Numbering System** | A97075 | UNS Registry | --- #### **7. Key Characteristics** **Advantages:** - **Exceptional strength-to-weight ratio** - **High fatigue strength** - Good machinability - Excellent damage tolerance - Proven reliability in critical applications - Good corrosion resistance with proper protection **Limitations:** - **Lower corrosion resistance** than 2000 series alloys - **Limited formability** in aged condition - **Susceptible to stress corrosion cracking** in short transverse direction - Higher cost than other aluminum alloys - Requires specialized welding techniques --- #### **8. Manufacturing Considerations** * **Machining:** Excellent machinability with proper tooling and techniques * **Forming:** Limited - must be formed in annealed condition then heat-treated * **Welding:** Not generally recommended; requires specialized techniques * **Heat Treatment:** Solution treated at 465-480°C, aged at 120-130°C * **Surface Treatment:** Excellent for anodizing, coating, and plating --- #### **9. Special Features** **7075-T6/T651** offers unique performance characteristics: * **Strength Comparison:** 30-40% stronger than 2024-T3 aluminum * **Fatigue Performance:** Excellent for aircraft structures * **Temperature Resistance:** Good performance up to 120°C (250°F) * **Quality Assurance:** Strict control of chemical composition and heat treatment **T651 vs T6 Advantages:** - Reduced distortion during machining - Better dimensional stability - Improved stress corrosion resistance - Preferred for complex, precision components --- #### **10. Performance in Service** - **Aerospace Reliability:** Decades of proven performance in aircraft structures - **Fatigue Life:** Excellent resistance to cyclic loading - **Fracture Toughness:** Good for high-strength aluminum alloy - **Maintenance:** Requires proper corrosion protection in aggressive environments **7075-T6/T651 Aluminum Alloy** represents the gold standard for high-strength aluminum applications where weight reduction and structural performance are critical. Its extensive use in aerospace applications, particularly in aircraft structures and components, demonstrates its capability to perform reliably in the most demanding environments. The T651 temper provides additional benefits for precision components where dimensional stability and reduced residual stresses are essential for performance and manufacturability.

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 2169 gallon liquid totes Special package is available on request.