7055-T7751 Aluminum alloy,Aluminum 7055-T7751 alloy，E FORU

### **7055-T7751 Aluminum Alloy: Ultra-High Strength Aerospace Plate** **7055-T7751 Aluminum Alloy** is a premium ultra-high strength aluminum-zinc-magnesium-copper alloy from the 7xxx series, representing the highest strength level commercially available in aluminum alloys. Developed specifically for aerospace applications, this alloy in the T7751 temper provides an exceptional combination of ultra-high strength, good corrosion resistance, and excellent fatigue performance, making it ideal for heavily loaded aircraft structures. --- #### **1. Chemical Composition** | Element | Content (%) (Typical) | Role in the Alloy | | :--- | :--- | :--- | | **Zinc (Zn)** | 7.6 - 8.4 | Primary strengthening element - higher content enables ultra-high strength | | **Magnesium (Mg)** | 1.8 - 2.3 | Co-operates with Zn to form strengthening precipitates | | **Copper (Cu)** | 2.0 - 2.6 | Enhances strength and improves 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)** | ≤ 0.10 | 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 T7751 Temper** The temper designation indicates specific processing: * **T7**: Solution Heat-Treated and then Artificially Over-Aged * **75**: Indicates the product has been stress-relieved by stretching * **1**: Denotes the specific aging treatment **Key Characteristics:** * **Ultra-high strength** - highest among commercial aluminum alloys * **Good exfoliation corrosion resistance** * **Excellent compression strength** * **Good fatigue performance** * **Superior strength-to-weight ratio** --- #### **3. Physical Properties** | Property | Value / Description | | :--- | :--- | | **Density** | 2.85 g/cm³ (0.103 lb/in³) | | **Melting Range** | 475°C - 635°C (887°F - 1175°F) | | **Electrical Conductivity** | 38-42% IACS | | **Thermal Conductivity** | 120-135 W/m·K | | **Coefficient of Thermal Expansion** | 23.8 × 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** | 620 - 660 MPa (90 - 96 ksi) | | **Tensile Yield Strength (0.2% Offset)** | 610 - 650 MPa (88 - 94 ksi) | | **Elongation** | 10-12% | | **Compression Yield Strength** | 600 - 640 MPa (87 - 93 ksi) | | **Shear Strength** | 350 - 380 MPa (51 - 55 ksi) | | **Fatigue Strength** | 180 - 200 MPa (26 - 29 ksi) | | **Fracture Toughness** | Good | --- #### **5. Product Applications** **7055-T7751** is used in the most demanding aerospace applications: * **Commercial Aircraft:** * Upper wing skins and covers * Wing stringers and ribs * Fuselage frames * **Military Aircraft:** * Highly loaded structural components * Fighter aircraft structures * **Space Applications:** * Space launch vehicle structures * Satellite components --- #### **6. International Standards** | Standard Body | Designation | Specification | | :--- | :--- | :--- | | **Aluminum Association** | 7055-T7751 | AA Teal Sheets | | **ASTM International** | 7055-T7751 | ASTM B209 | | **Aerospace (AMS)** | 7055-T7751 | AMS 4337 | | **European Norm** | EN AW-7055 T7751 | EN 485-2 | | **Unified Numbering System** | A97055 | UNS Registry | --- #### **7. Key Characteristics** **Advantages:** * Highest strength among commercial aluminum alloys * Excellent strength-to-weight ratio * Good corrosion resistance for ultra-high strength alloy * Superior compression properties * Good fatigue performance **Limitations:** * Lower fracture toughness than some other aerospace alloys * Requires careful processing and heat treatment * Higher cost * Limited formability in aged condition **Heat Treatment:** The T7751 temper involves: * Solution treatment at 471-482°C * Quenching * Stress-relieving by stretching * Artificial aging to specific conditions --- #### **8. Manufacturing Considerations** * **Machining:** Good machinability but requires appropriate tooling * **Forming:** Best formed in annealed condition * **Welding:** Not generally recommended for fusion welding * **Corrosion Protection:** Requires appropriate surface protection * **Processing:** Requires strict control of heat treatment parameters **7055-T7751** represents the pinnacle of aluminum alloy strength development, offering the highest mechanical properties available while maintaining adequate corrosion resistance and damage tolerance for the most critically loaded aerospace structures.

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 2153 gallon liquid totes Special package is available on request.