7076-T61 Aluminum alloy,Aluminum 7076-T61 alloy，E FORU

### **7076-T61 Aluminum Alloy: High-Strength Aerospace Alloy** **7076-T61 Aluminum Alloy** is a high-strength, heat-treatable aluminum-zinc-magnesium-copper alloy from the 7xxx series, specifically designed for aerospace and defense applications requiring exceptional strength and good fatigue resistance. The T61 temper provides a specific combination of solution heat treatment and artificial aging to achieve optimal mechanical properties. --- #### **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 - 2.0 | Enhances strength and work hardening characteristics | | **Copper (Cu)** | 0.50 - 1.0 | Improves strength and stress corrosion cracking resistance | | **Chromium (Cr)** | 0.10 - 0.25 | Controls grain structure and improves toughness | | **Iron (Fe)** | ≤ 0.40 | Impurity - controlled for improved consistency | | **Silicon (Si)** | ≤ 0.30 | Impurity - controlled for improved ductility | | **Manganese (Mn)** | 0.20 - 0.50 | Enhances strength and grain structure control | | **Titanium (Ti)** | ≤ 0.10 | - | | **Other Elements** | ≤ 0.05 each; ≤ 0.15 total | - | | **Aluminum (Al)** | Balance | Base metal | --- #### **2. Understanding the T61 Temper** The T61 temper designation indicates: - **Solution heat-treated** at elevated temperature - **Rapidly quenched** to preserve supersaturated solid solution - **Artificially aged** to achieve specific mechanical properties - **Moderate strength level** with good dimensional stability **Key Characteristics:** - High strength-to-weight ratio - Good fatigue resistance - Moderate corrosion resistance - Suitable for medium to high-stress applications --- #### **3. Physical Properties** | Property | Value / Description | | :--- | :--- | | **Density** | 2.82 g/cm³ (0.102 lb/in³) | | **Melting Range** | 475°C - 635°C (887°F - 1175°F) | | **Electrical Conductivity** | 36-40% 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) | --- #### **4. Mechanical Properties (Typical)** | Property | Typical Value | | :--- | :--- | | **Tensile Ultimate Strength** | 480 - 530 MPa (70 - 77 ksi) | | **Tensile Yield Strength (0.2% Offset)** | 420 - 470 MPa (61 - 68 ksi) | | **Elongation** | 8-12% | | **Compression Yield Strength** | 410 - 460 MPa (59 - 67 ksi) | | **Shear Strength** | 280 - 320 MPa (41 - 46 ksi) | | **Fatigue Strength** | 140 - 170 MPa (20 - 25 ksi) | | **Brinell Hardness** | 130 - 145 HB | --- #### **5. Product Applications** **7076-T61** is primarily used in high-strength applications: * **Aerospace Components:** * Aircraft structural members * Wing components * Fuselage frames * Brackets and fittings * **Defense Applications:** * Military vehicle components * Weapon system parts * Armored vehicle elements * **High-Performance Applications:** * Racing components * High-stress mechanical parts * Specialized tooling * **Industrial Applications:** * High-strength fasteners * Machinery components * Structural supports --- #### **6. International Standards** | Standard Body | Designation | Specification | | :--- | :--- | :--- | | **Aluminum Association** | 7076-T61 | AA Teal Sheets | | **ASTM International** | 7076-T61 | ASTM B221 | | **Aerospace (AMS)** | 7076 | AMS 4118 | | **European Norm** | EN AW-7076 T61 | EN 755-2 | | **Unified Numbering System** | A97076 | UNS Registry | --- #### **7. Key Characteristics** **Advantages:** - **High strength-to-weight ratio** - **Good fatigue resistance** - **Excellent machinability** - Good wear resistance - Moderate corrosion resistance with proper protection - Suitable for medium to high-temperature applications **Limitations:** - Limited formability in T61 condition - Requires controlled heat treatment processes - Not suitable for severe corrosive environments without protection - Higher cost than standard aluminum alloys --- #### **8. Manufacturing Considerations** * **Machining:** Excellent machinability with proper tooling * **Forming:** Best formed in annealed condition before heat treatment * **Welding:** Requires specialized techniques; not generally recommended * **Heat Treatment:** Solution treatment at 460-475°C, aging at 115-130°C * **Surface Treatment:** Good for anodizing and other surface treatments --- #### **9. Special Features** **7076-T61** offers specific advantages for specialized applications: * **Strength Level:** Balanced mechanical properties for structural applications * **Thermal Stability:** Good performance at moderate temperatures * **Quality Consistency:** Reliable mechanical properties through controlled processing * **Manufacturing Flexibility:** Can be processed using standard aluminum fabrication methods **Heat Treatment Process:** 1. Solution heat treatment: 460-475°C (860-890°F) 2. Rapid quenching in water or polymer 3. Artificial aging: 115-130°C (240-265°F) for 12-24 hours --- #### **10. Performance Characteristics** - **Fatigue Performance:** Good resistance to cyclic loading - **Corrosion Resistance:** Moderate; requires protection in aggressive environments - **Fracture Toughness:** Adequate for most structural applications - **Temperature Resistance:** Suitable for applications up to 120°C (250°F) **7076-T61 Aluminum Alloy** provides a reliable high-strength solution for applications requiring good mechanical properties and fatigue resistance. While less commonly used than some other 7xxx series alloys, it offers specific advantages for particular applications where its balance of strength, manufacturability, and performance characteristics meet specific design requirements. The alloy continues to find use in specialized aerospace and defense applications where its particular combination of properties is valued.

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 2172 gallon liquid totes Special package is available on request.