7050-T74 Aluminum alloy,Aluminum 7050-T74 alloy，E FORU

### **7050-T74 Aluminum Alloy: The Optimal Balance for Aerospace Structures** **7050-T74 Aluminum Alloy** is a high-strength, heat-treatable aluminum-zinc-magnesium-copper alloy specifically developed for aerospace applications. The T74 temper represents a carefully engineered over-aged condition that provides an outstanding balance between static strength, fatigue performance, fracture toughness, and most importantly, exceptional resistance to exfoliation corrosion and stress corrosion cracking (SCC). This makes it particularly suitable for thick-section applications where through-thickness properties are critical. --- #### **1. Chemical Composition (Nominal %)** The composition of 7050 is optimized for high strength with improved corrosion resistance. | Element | Content (%) | | :--- | :--- | | Zinc (Zn) | 5.7 - 6.7 | | Magnesium (Mg) | 1.8 - 2.7 | | Copper (Cu) | 2.0 - 2.6 | | Zirconium (Zr) | 0.08 - 0.15 | | Iron (Fe) | ≤ 0.15 | | Silicon (Si) | ≤ 0.12 | | Manganese (Mn) | ≤ 0.10 | | Titanium (Ti) | ≤ 0.06 | | Other (Each) | ≤ 0.05 | | Aluminum (Al) | Balance | --- #### **2. Physical Properties** | Property | Value | | :--- | :--- | | Density | 2.83 g/cm³ | | Melting Range | 490 - 635 °C | | 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 | --- #### **3. Mechanical Properties (Typical)** | Property | Value | | :--- | :--- | | Tensile Ultimate Strength | 510 - 540 MPa | | Tensile Yield Strength | 440 - 480 MPa | | Elongation | 10-12% | | Compression Yield Strength | 440 - 480 MPa | | Shear Strength | 290 - 310 MPa | | Fatigue Strength (R.R. Moore) | 160 - 180 MPa | --- #### **4. Product Applications** 7050-T74 is extensively used in aerospace applications including: - **Aircraft Structures:** - Upper wing skins and stringers - Fuselage frames and bulkheads - Wing ribs and spars - Stabilizer components - **Defense Applications:** - Military aircraft structural components - Missile and rocket structures - **Other Applications:** - Critical machinery components - High-stress structural applications --- #### **5. International Standards** | Standard Body | Designation | Specification | | :--- | :--- | :--- | | Aluminum Association | 7050-T74 | AA Teal Sheets | | ASTM International | 7050-T74 | ASTM B209 | | Aerospace (AMS) | 7050-T74 | AMS 4050H | | European Norm | EN AW-7050 T74 | EN 485-2 | | Unified Numbering System | A97050 | UNS Registry | --- #### **6. Key Characteristics** **Advantages:** - Excellent exfoliation corrosion resistance - Good stress corrosion cracking resistance - High strength-to-weight ratio - Good fracture toughness - Suitable for thick sections up to 150 mm **Limitations:** - Lower strength than 7050-T6X tempers - Requires proper heat treatment facilities - Higher cost than 7075 alloys **Heat Treatment:** The T74 temper involves: - Solution treatment at 477-488°C - Quenching - Artificial aging at 120-130°C followed by 155-165°C --- #### **7. Manufacturing Considerations** - **Machining:** Good machinability in aged condition - **Forming:** Can be formed in annealed or freshly quenched condition - **Welding:** Not generally recommended for fusion welding - **Corrosion Protection:** Requires appropriate surface protection for severe environments 7050-T74 represents one of the most balanced high-strength aluminum alloys available for aerospace applications, offering the optimal combination of mechanical properties and corrosion resistance for critical structural components.

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 2150 gallon liquid totes Special package is available on request.