7050-T73652 Aluminum alloy,Aluminum 7050-T73652 alloy, forgings，E FORU

### **7050-T73652 Aluminum Alloy: High-Strength Aerospace Forgings** **7050-T73652 Aluminum Alloy** is a specific temper designation for forged products made from the premium 7050 aluminum alloy. This temper represents the material in its final, fully heat-treated condition, specifically optimized for **die forgings and hand forgings**. The T73652 temper provides an exceptional balance of very high strength, superior stress corrosion cracking (SCC) resistance, and excellent fracture toughness, making it a preferred choice for the most critical aerospace structural components. --- #### **1. Chemical Composition** The composition follows the standard 7050 alloy with tight controls to ensure consistent performance in forged components. | Element | Content (%) (Typical) | Role in the Alloy | | :--- | :--- | :--- | | **Zinc (Zn)** | 5.7 - 6.7 | Primary strengthening element; forms the main hardening precipitates (MgZn₂). | | **Magnesium (Mg)** | 1.8 - 2.7 | Co-operates with Zn to form the strengthening η' phase during aging. | | **Copper (Cu)** | 2.0 - 2.6 | Critically enhances strength and dramatically improves resistance to stress corrosion cracking. | | **Zirconium (Zr)** | 0.08 - 0.15 | Forms fine Al₃Zr dispersoids that inhibit recrystallization, improving toughness and SCC resistance. | | **Iron (Fe)** | ≤ 0.15 | Tighter impurity control to enhance fracture toughness. | | **Silicon (Si)** | ≤ 0.12 | Tighter impurity control to improve ductility and toughness. | | **Manganese (Mn)** | ≤ 0.10 | - | | **Titanium (Ti)** | ≤ 0.06 | - | | **Other Impurities** | ≤ 0.05 each; ≤ 0.15 total | - | | **Aluminum (Al)** | Balance | Base metal. | --- #### **2. Understanding the T73652 Temper** The temper designation provides specific information about the thermal-mechanical processing: * **T7**: Solution Heat-Treated and then Artificially Over-Aged. * **36**: Indicates the product has been stress-relieved by **compression** (forging) to produce a permanent set of 1% to 5%. * **52**: Specifically denotes that the product is in the form of **die forgings or hand forgings**. **Key Characteristics of T73652 Condition:** * The **over-aging process** (to T76 condition) provides superior resistance to exfoliation corrosion and good stress corrosion cracking resistance compared to the T6 temper. * The **compressive stress-relieving** ensures dimensional stability and minimizes residual stresses, making it ideal for complex forged components that require precise final machining. * This temper maintains **higher strength** than the T74-type (e.g., T7451) tempers while offering better corrosion resistance than the peak-aged T6 temper. --- #### **3. Physical Properties** The physical properties are consistent with other 7050 alloy tempers. | Property | Value / Description | | :--- | :--- | | **Density** | ≈ 2.83 g/cm³ (0.102 lb/in³) | | **Melting Range** | ≈ 490°C - 630°C (914°F - 1166°F) | | **Electrical Conductivity** | ≈ 38-42% IACS (International Annealed Copper Standard) | | **Thermal Conductivity** | ≈ 115-135 W/m·K | | **Coefficient of Thermal Expansion** | ≈ 23.5 x 10⁻⁶/°C (20-100°C) | | **Modulus of Elasticity (E)** | ≈ 71 GPa (10.3 x 10⁶ psi) | --- #### **4. Mechanical Properties (Typical)** The T73652 temper offers a robust combination of properties suitable for critical aerospace forgings. | Property | Typical Value | | :--- | :--- | | **Tensile Strength (Ultimate)** | 510 - 540 MPa (74 - 78 ksi) | | **Tensile Yield Strength (0.2% Offset)** | 440 - 480 MPa (64 - 70 ksi) | | **Elongation (in 50 mm / 2 in)** | 9 - 11 % | | **Hardness (Brinell)** | ≈ 140 - 150 HB | --- #### **5. Product Applications** 7050-T73652 is specifically used for high-integrity forged components in demanding applications. * **Aerospace Industry (Primary Application):** * **Aircraft Bulkheads:** Both forward and main fuselage bulkheads. * **Wing Spars and Ribs:** Primary load-carrying structures in wings. * **Fuselage Frames:** Critical structural frames. * **Landing Gear Components:** Support structures and attachments. * **Rotor System Components:** Helicopter rotor hubs and attachments. * **Defense and Space:** * **Missile and Rocket Components:** Structural rings and motor mounts. * **Military Vehicle Components:** Structural supports and attachments. --- #### **6. International Standards** 7050-T73652 is specified in major aerospace standards for forging applications. | Standard Body | Alloy Designation | Common Forms | Relevant Standard | | :--- | :--- | :--- | :--- | | **Aluminum Association (AA)** | **7050-T73652** | Die Forgings, Hand Forgings | AA Teal Sheets / ANSI H35.1 | | **Aerospace (AMS)** | **7050-T73652** | Die Forgings | **AMS 4106** (This standard specifically covers 7050 Alloy, Die Forgings, T73652 Temper) | | **ASTM International** | **Aluminum 7050** | Forgings | ASTM B247 (Specification for Aluminum and Aluminum-Alloy Die Forgings, Hand Forgings, and Rolled Ring Forgings) | | **European Norm (EN)** | **EN AW-7050 T73652** | Forgings | EN 586-2 (Forgings) | --- #### **Key Advantages & Summary** * **Excellent Strength-Toughness Balance:** Provides high strength while maintaining good fracture toughness, crucial for damage-tolerant designs. * **Superior Exfoliation Corrosion Resistance:** The T76 over-aging treatment provides excellent resistance to layered corrosion. * **Good Stress Corrosion Cracking Resistance:** Suitable for applications under sustained tensile stress. * **Dimensional Stability:** The compressive stress-relief minimizes distortion during final machining of complex forged shapes. * **Optimized for Forging:** The temper is specifically designed to leverage the grain flow and mechanical advantages of the forging process. In conclusion, **7050-T73652 Aluminum Alloy Forgings** represent a premium material solution for the most demanding aerospace structural applications. The specific thermal-mechanical processing of this temper delivers an optimal balance of **high strength, excellent corrosion resistance, and superior damage tolerance**, making it an industry standard for critical forged components in modern aircraft where reliability and performance are paramount.

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 2148 gallon liquid totes Special package is available on request.