7175-T66 Aluminum alloy,Aluminum 7175-T66 alloy，E FORU

### **7175-T66 Aluminum Alloy: High-Strength Forging Alloy** **7175-T66 Aluminum Alloy** is a high-strength aluminum-zinc-magnesium-copper alloy specifically designed for forged applications. The T66 temper represents a specialized heat treatment that provides an optimal balance of high strength, good toughness, and corrosion resistance for critical aerospace components. --- #### **1. Chemical Composition** | Element | Content (%) (Typical) | Role in the Alloy | | :--- | :--- | :--- | | **Zinc (Zn)** | 5.1 - 6.1 | Primary strengthening element through formation of MgZn₂ precipitates | | **Magnesium (Mg)** | 2.1 - 2.9 | Enhances strength and age-hardening response | | **Copper (Cu)** | 1.2 - 2.0 | Improves strength and stress corrosion cracking resistance | | **Chromium (Cr)** | 0.18 - 0.28 | Controls grain structure and improves toughness | | **Iron (Fe)** | ≤ 0.20 | Impurity - controlled for improved consistency | | **Silicon (Si)** | ≤ 0.15 | Impurity - controlled for improved ductility | | **Manganese (Mn)** | ≤ 0.10 | - | | **Titanium (Ti)** | ≤ 0.10 | - | | **Other Elements** | ≤ 0.05 each; ≤ 0.15 total | - | | **Aluminum (Al)** | Balance | Base metal | --- #### **2. Understanding the T66 Temper** The T66 temper designation indicates: - **T6**: Solution heat-treated and artificially aged - **6**: Specialized aging treatment for forged products **Key Characteristics:** - Optimized for forged components - Enhanced strength-toughness combination - Good stress corrosion resistance - Suitable for thick sections --- #### **3. Physical Properties** | Property | Value / Description | | :--- | :--- | | **Density** | 2.80 g/cm³ (0.101 lb/in³) | | **Melting Range** | 477°C - 638°C (890°F - 1180°F) | | **Electrical Conductivity** | 38-42% IACS | | **Thermal Conductivity** | 130-150 W/m·K | | **Coefficient of Thermal Expansion** | 23.6 × 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 - 550 MPa (74 - 80 ksi) | | **Tensile Yield Strength (0.2% Offset)** | 440 - 480 MPa (64 - 70 ksi) | | **Elongation** | 9-12% | | **Compression Yield Strength** | 430 - 470 MPa (62 - 68 ksi) | | **Shear Strength** | 290 - 320 MPa (42 - 46 ksi) | | **Fatigue Strength** | 150 - 180 MPa (22 - 26 ksi) | | **Brinell Hardness** | 135 - 150 HB | --- #### **5. Product Applications** **7175-T66** is primarily used in forged aerospace components: * **Aircraft Structural Forgings:** * Wing spar fittings * Bulkhead components * Landing gear support structures * Engine mounts * * Fuselage frames * **Military Applications:** * Military aircraft forged components * Missile structural parts * Defense system components * **Space Applications:** * Rocket motor cases * Spacecraft structural forgings * **Industrial Applications:** * High-strength machinery components * Heavy equipment forgings --- #### **6. International Standards** | Standard Body | Designation | Specification | | :--- | :--- | :--- | | **Aluminum Association** | 7175-T66 | AA Teal Sheets | | **ASTM International** | 7175-T66 | ASTM B247 | | **Aerospace (AMS)** | 7175-T66 | AMS 4120 | | **European Norm** | EN AW-7175 T66 | EN 586-2 | | **Unified Numbering System** | A97175 | UNS Registry | --- #### **7. Key Characteristics** **Advantages:** * **High strength-to-weight ratio** * **Excellent forgeability** * **Good fracture toughness** * **Superior fatigue performance** * **Good corrosion resistance** * **Consistent properties in thick sections** **Limitations:** * Requires specialized forging equipment * Higher cost than conventional alloys * Limited to forged product forms * Requires precise heat treatment control --- #### **8. Manufacturing Considerations** * **Forging:** Excellent forgeability with good die life * **Machining:** Good machinability with proper tooling * **Heat Treatment:** Critical control of solution treatment and aging * **Quality Control:** Extensive non-destructive testing required * **Surface Treatment:** Good for anodizing and coating --- #### **9. Special Features for Forged Applications** **7175-T66** offers unique advantages for forged components: * **Grain Flow Optimization:** Superior grain structure from forging process * **Property Consistency:** Uniform mechanical properties throughout sections * **Design Flexibility:** Capable of complex forged shapes * **Quality Assurance:** Reliable performance in critical applications **Forging Process Benefits:** - Enhanced mechanical properties through grain flow - Reduced material waste - Ability to produce complex geometries - Improved structural integrity --- #### **10. Performance Characteristics** * **Fatigue Performance:** Excellent for aircraft structural applications * **Fracture Toughness:** Good damage tolerance * **Corrosion Resistance:** Adequate with proper protection * **Temperature Stability:** Suitable for aerospace service conditions **7175-T66 Aluminum Alloy** represents a specialized solution for high-strength forged aerospace components. The T66 temper provides an optimal balance of properties specifically tailored for forged applications, making this alloy particularly valuable for critical aircraft structures where reliability, strength, and performance are essential requirements. The alloy's proven track record in aerospace applications demonstrates its capability to meet the demanding requirements of modern aircraft design and manufacturing.

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 2191 gallon liquid totes Special package is available on request.