7277 Aluminum alloy,Aluminum 7277 alloy，E FORU

### **7277 Aluminum Alloy: High-Strength Aerospace Alloy** **7277 Aluminum Alloy** is a high-strength, heat-treatable aluminum-zinc-magnesium-copper alloy from the 7xxx series, specifically developed for aerospace applications requiring an optimal balance of high strength, good toughness, and excellent fatigue resistance. This alloy represents advanced aluminum alloy technology for critical structural components. --- #### **1. Chemical Composition** | Element | Content (%) (Typical) | Role in the Alloy | | :--- | :--- | :--- | | **Zinc (Zn)** | 6.8 - 7.8 | Primary strengthening element through formation of MgZn₂ precipitates | | **Magnesium (Mg)** | 1.9 - 2.6 | Enhances strength and age-hardening response | | **Copper (Cu)** | 1.7 - 2.3 | Improves strength and stress corrosion cracking resistance | | **Zirconium (Zr)** | 0.08 - 0.15 | Controls grain structure and inhibits recrystallization | | **Iron (Fe)** | ≤ 0.12 | Tightly controlled impurity for improved toughness | | **Silicon (Si)** | ≤ 0.10 | Tightly controlled impurity for improved ductility | | **Manganese (Mn)** | ≤ 0.08 | - | | **Chromium (Cr)** | ≤ 0.04 | - | | **Titanium (Ti)** | ≤ 0.06 | - | | **Other Elements** | ≤ 0.05 each; ≤ 0.15 total | - | | **Aluminum (Al)** | Balance | Base metal | --- #### **2. Physical Properties** | Property | Value / Description | | :--- | :--- | | **Density** | 2.82 g/cm³ (0.102 lb/in³) | | **Melting Range** | 475°C - 638°C (887°F - 1180°F) | | **Electrical Conductivity** | 36-40% IACS | | **Thermal Conductivity** | 125-140 W/m·K | | **Coefficient of Thermal Expansion** | 23.5 × 10⁻⁶/°C (20-100°C) | | **Modulus of Elasticity** | 71 GPa (10.3 × 10⁶ psi) | --- #### **3. Mechanical Properties (Typical for T7651 Temper)** | Property | Typical Value | | :--- | :--- | | **Tensile Ultimate Strength** | 550 - 590 MPa (80 - 86 ksi) | | **Tensile Yield Strength (0.2% Offset)** | 490 - 530 MPa (71 - 77 ksi) | | **Elongation** | 10-13% | | **Compression Yield Strength** | 480 - 520 MPa (70 - 75 ksi) | | **Shear Strength** | 320 - 350 MPa (46 - 51 ksi) | | **Fatigue Strength** | 175 - 195 MPa (25 - 28 ksi) | | **Fracture Toughness** | Excellent | --- #### **4. Product Applications** **7277 Aluminum Alloy** is used in demanding aerospace and defense applications: * **Aerospace Structures:** * Upper wing skins and covers * Fuselage frames and bulkheads * Wing ribs and spars * Stabilizer components * Aircraft landing gear components * **Military Applications:** * Fighter aircraft structures * Military helicopter components * Missile and rocket structures * **High-Performance Applications:** * Racing vehicle components * High-stress structural applications * Critical machinery components --- #### **5. International Standards** | Standard Body | Designation | Specification | | :--- | :--- | :--- | | **Aluminum Association** | 7277 | AA Teal Sheets | | **ASTM International** | 7277 | ASTM B209 / B221 | | **Aerospace (AMS)** | 7277 | AMS 4344 | | **European Norm** | EN AW-7277 | EN 485-2 / EN 755-2 | | **Unified Numbering System** | A97277 | UNS Registry | --- #### **6. Key Characteristics** **Advantages:** * High strength-to-weight ratio * Excellent fatigue performance * Good corrosion resistance * Superior fracture toughness * Good stress corrosion cracking resistance * Excellent damage tolerance * Good machinability in heat-treated condition **Limitations:** * Requires controlled heat treatment * Higher cost than conventional aluminum alloys * Limited formability in aged condition * Requires specialized welding techniques --- #### **7. Manufacturing Considerations** * **Machining:** Excellent machinability in aged condition with proper tooling * **Forming:** Best formed in annealed or freshly quenched condition * **Welding:** Requires specialized techniques; friction stir welding preferred * **Corrosion Protection:** Good inherent corrosion resistance * **Heat Treatment:** Requires precise control of parameters --- #### **8. Special Features** **7277 Aluminum Alloy** offers several distinctive advantages: * **Optimized Composition:** Carefully balanced zinc, magnesium, and copper content provides an optimal combination of properties * **Versatile Applications:** Suitable for both sheet, plate, and extruded products * **Reliable Performance:** Consistent mechanical properties across different product forms * **Advanced Metallurgy:** Represents the latest developments in aluminum alloy technology The alloy is particularly valued for its balanced performance profile, making it suitable for applications where multiple performance criteria must be met simultaneously. Its development reflects ongoing advancements in aluminum alloy technology to meet evolving aerospace requirements. **7277 Aluminum Alloy** represents a significant advancement in aluminum alloy technology, providing an excellent balance of mechanical properties and corrosion resistance for demanding aerospace and defense applications where reliability and performance are critical. The alloy's combination of high strength, good toughness, and excellent fatigue resistance makes it particularly suitable for heavily loaded aircraft 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 2207 gallon liquid totes Special package is available on request.