7050-T7451 Aluminum alloy,Aluminum 7050-T7451 alloy，E FORU

### **7050-T7451 Aluminum Alloy: High-Strength Aerospace Plate** **7050-T7451 Aluminum Alloy** is a premium heat-treatable aluminum alloy from the Al-Zn-Mg-Cu (7xxx) series, specifically developed for aerospace applications requiring superior combinations of strength, toughness, and corrosion resistance. The T7451 temper designation indicates a specific thermal-mechanical treatment that makes this alloy particularly suitable for thick plate applications where through-thickness properties are critical. --- #### **1. Chemical Composition** The composition is carefully balanced to achieve optimal performance in the T7451 temper. | Element | Content (%) (Typical) | Role in the Alloy | | :--- | :--- | :--- | | **Zinc (Zn)** | 5.7 - 6.7 | Primary strengthening element through formation of MgZn₂ precipitates | | **Magnesium (Mg)** | 1.8 - 2.7 | Enhances strength and work hardening characteristics | | **Copper (Cu)** | 2.0 - 2.6 | Improves strength and 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)** | ≤ 0.12 | 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 T7451 Temper** The temper designation provides specific information about the processing: * **T7**: Solution Heat-Treated and then Artificially Over-Aged * **45**: Indicates the product has been stress-relieved by stretching (1.5-3% permanent set) * **1**: Denotes the final aging treatment to achieve the T74 condition **Key Characteristics:** * The **over-aging process** (T74) provides excellent exfoliation corrosion resistance and good stress corrosion cracking (SCC) resistance * **Stress-relief by stretching** ensures dimensional stability and reduces residual stresses * Maintains **high strength** while offering better corrosion resistance than T6 tempers --- #### **3. Physical Properties** | Property | Value / Description | | :--- | :--- | | **Density** | 2.83 g/cm³ (0.102 lb/in³) | | **Melting Range** | 490°C - 635°C (914°F - 1175°F) | | **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 (10.3 × 10⁶ psi) | --- #### **4. Mechanical Properties (Typical)** | Property | Typical Value | | :--- | :--- | | **Tensile Ultimate Strength** | 510 - 540 MPa (74 - 78 ksi) | | **Tensile Yield Strength (0.2% Offset)** | 440 - 480 MPa (64 - 70 ksi) | | **Elongation** | 10-12% | | **Compression Yield Strength** | 440 - 480 MPa (64 - 70 ksi) | | **Shear Strength** | 290 - 310 MPa (42 - 45 ksi) | | **Fatigue Strength (R.R. Moore)** | 160 - 180 MPa (23 - 26 ksi) | --- #### **5. Product Applications** **7050-T7451** is extensively used in critical aerospace applications: * **Aircraft Structures:** * Upper wing skins and planks * 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 --- #### **6. International Standards** | Standard Body | Designation | Specification | | :--- | :--- | :--- | | **Aluminum Association** | 7050-T7451 | AA Teal Sheets | | **ASTM International** | 7050-T7451 | ASTM B209 | | **Aerospace (AMS)** | 7050-T7451 | AMS 4050H | | **European Norm** | EN AW-7050 T7451 | EN 485-2 | | **Unified Numbering System** | A97050 | UNS Registry | --- #### **7. Key Characteristics** **Advantages:** * Excellent exfoliation corrosion resistance * Good stress corrosion cracking resistance * High strength-to-weight ratio * Good fracture toughness, particularly in short transverse direction * 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 T7451 temper involves: * Solution treatment at 477-488°C * Quenching * Stress-relieving by stretching (1.5-3%) * Artificial aging to T74 condition --- #### **8. 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-T7451** 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, particularly in plate form.

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 2151 gallon liquid totes Special package is available on request.