7055-T77511 Aluminum alloy,Aluminum 7055-T7751 alloy，E FORU

### **7055-T77511 Aluminum Alloy: Ultra-High Strength Aerospace Extrusions** **7055-T77511 Aluminum Alloy** is a premium ultra-high strength aluminum-zinc-magnesium-copper alloy specifically designed for extruded aerospace components. As part of the 7xxx series, this alloy in the T77511 temper provides the highest strength level available in commercial aluminum extrusions, offering exceptional strength-to-weight ratio for critically loaded aircraft structures. --- #### **1. Chemical Composition** | Element | Content (%) | Role in the Alloy | | :--- | :--- | :--- | | **Zinc (Zn)** | 7.6 - 8.4 | Primary strengthening element - enables ultra-high strength | | **Magnesium (Mg)** | 1.8 - 2.3 | Forms strengthening precipitates with zinc | | **Cu (Cu)** | 2.0 - 2.6 | Enhances strength and corrosion resistance | | **Zirconium (Zr)** | 0.08 - 0.15 | Grain structure control | | **Iron (Fe)** | ≤ 0.15 | Controlled impurity | | **Silicon (Si)** | ≤ 0.10 | Controlled impurity | | **Manganese (Mn)** | ≤ 0.10 | - | | **Titanium (Ti)** | ≤ 0.06 | - | | **Other Elements** | ≤ 0.05 each | - | | **Aluminum (Al)** | Balance | Base metal | --- #### **2. Understanding the T77511 Temper** The temper designation specifies: * **T7**: Solution Heat-Treated and Artificially Over-Aged * **75**: Stress-relieved by stretching * **11**: Applies to extruded products **Key Characteristics:** * **Ultra-high strength** in extruded forms * **Good corrosion resistance** for ultra-high strength alloy * **Excellent fatigue performance** * **Superior strength-to-weight ratio** --- #### **3. Physical Properties** | Property | Value | | :--- | :--- | | **Density** | 2.85 g/cm³ | | **Melting Range** | 475°C - 635°C | | **Electrical Conductivity** | 38-42% IACS | | **Thermal Conductivity** | 120-135 W/m·K | | **Coefficient of Thermal Expansion** | 23.8 × 10⁻⁶/°C | | **Modulus of Elasticity** | 71 GPa | --- #### **4. Mechanical Properties (Typical)** | Property | Value | | :--- | :--- | | **Tensile Ultimate Strength** | 620 - 660 MPa | | **Tensile Yield Strength** | 610 - 650 MPa | | **Elongation** | 10-12% | | **Compression Yield Strength** | 600 - 640 MPa | | **Shear Strength** | 350 - 380 MPa | | **Fatigue Strength** | 180 - 200 MPa | --- #### **5. Product Applications** **7055-T77511** is used in critical aerospace extruded components: * **Aircraft Structures:** * Upper wing stringers * Fuselage longerons * Wing spar chords * Floor beams * **Space Applications:** * Launch vehicle structures * Spacecraft frames * **Military Applications:** * Highly loaded structural members --- #### **6. International Standards** | Standard Body | Designation | Specification | | :--- | :--- | :--- | | **Aluminum Association** | 7055-T77511 | AA Teal Sheets | | **ASTM International** | 7055-T77511 | ASTM B221 | | **Aerospace (AMS)** | 7055-T77511 | AMS 4337 | | **European Norm** | EN AW-7055 T77511 | EN 755-2 | --- #### **7. Key Characteristics** **Advantages:** * Highest strength in extruded aluminum alloys * Excellent strength-to-weight ratio * Good corrosion resistance * Superior compression properties **Limitations:** * Requires careful processing * Higher cost * Limited formability in aged condition **Heat Treatment:** * Solution treatment at 471-482°C * Quenching * Stress-relieving by stretching * Artificial aging --- #### **8. Manufacturing Considerations** * **Machining:** Requires appropriate tooling * **Forming:** Best formed in solution heat-treated condition * **Welding:** Not generally recommended * **Corrosion Protection:** Requires surface protection **7055-T77511** represents the highest strength level available in aluminum extrusions, providing exceptional mechanical properties for the most demanding aerospace applications where weight reduction is critical.

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 2154 gallon liquid totes Special package is available on request.