7175-T736; 7175-T7365x Aluminum alloy,Aluminum 7175-T736; 7175-T7365x1 alloy，E FORU

### **7175-T736 / 7175-T7365x Aluminum Alloy: High-Strength Forging Alloys** **7175-T736 and 7175-T7365x** are specialized temper designations for forged products made from 7175 aluminum alloy. These tempers provide an optimal balance of high strength, excellent corrosion resistance, and superior fatigue performance for critical aerospace forgings. --- #### **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 Tempers** **T736 Temper:** - Solution heat-treated and artificially over-aged - Enhanced corrosion resistance - Good strength-toughness combination - Primarily for hand forgings **T7365x Tempers:** - **T73651**: Die forgings, stress-relieved - **T73652**: Hand forgings, stress-relieved - Solution heat-treated, stress-relieved by compressing, and artificially over-aged - Improved dimensional stability --- #### **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** | 41-45% IACS | | **Thermal Conductivity** | 140-160 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 | T736 Temper | T73651 Temper | | :--- | :--- | :--- | | **Tensile Ultimate Strength** | 460 - 500 MPa (67 - 73 ksi) | 450 - 490 MPa (65 - 71 ksi) | | **Tensile Yield Strength** | 390 - 430 MPa (57 - 62 ksi) | 380 - 420 MPa (55 - 61 ksi) | | **Elongation** | 11-15% | 12-16% | | **Shear Strength** | 260 - 290 MPa (38 - 42 ksi) | 250 - 280 MPa (36 - 41 ksi) | | **Fatigue Strength** | 135 - 165 MPa (20 - 24 ksi) | 130 - 160 MPa (19 - 23 ksi) | | **Brinell Hardness** | 115 - 130 HB | 110 - 125 HB | --- #### **5. Product Applications** **7175-T736/T7365x** are used in critical forged aerospace components: * **Aircraft Structural Forgings:** * Wing spar fittings * Bulkhead components * Landing gear supports * Engine mounts * Fuselage frames * **Military Applications:** * Fighter aircraft components * Missile structures * Military vehicle parts * **Space Applications:** * Rocket motor cases * Spacecraft structural members * **Commercial Aviation:** * Commercial aircraft forgings * Structural attachment points --- #### **6. International Standards** | Standard Body | Designation | Specification | | :--- | :--- | :--- | | **Aluminum Association** | 7175-T736 / T73651 | AA Teal Sheets | | **ASTM International** | 7175-T736 / T73651 | ASTM B247 | | **Aerospace (AMS)** | 7175-T736 | AMS 4130 | | **Aerospace (AMS)** | 7175-T73651 | AMS 4131 | | **European Norm** | EN AW-7175 T736 | EN 586-2 | --- #### **7. Key Characteristics** **Advantages:** * **Excellent corrosion resistance** * **Good stress corrosion cracking resistance** * **Superior fatigue performance** * **High strength-to-weight ratio** * **Excellent forgeability** * **Good fracture toughness** * **Reduced residual stresses** **Limitations:** * Lower strength than T6 temper * Higher processing costs * Limited to forged product forms * Requires specialized heat treatment --- #### **8. Manufacturing Considerations** * **Forging:** Excellent forgeability with good die life * **Machining:** Good machinability with minimal distortion * **Heat Treatment:** Critical control of aging parameters * **Quality Control:** Extensive non-destructive testing * **Surface Treatment:** Excellent for protective coatings --- #### **9. Special Features for Forgings** **7175-T736/T7365x** offer unique advantages: * **Grain Flow Optimization:** Superior mechanical properties through controlled grain structure * **Property Consistency:** Uniform properties in complex forged shapes * **Corrosion Performance:** Enhanced resistance in aggressive environments * **Dimensional Stability:** Reduced machining distortion **Forging Benefits:** - Enhanced fatigue performance through grain flow - Ability to produce near-net shapes - Reduced material waste - Improved structural integrity --- #### **10. Performance Characteristics** * **Corrosion Resistance:** Excellent exfoliation and stress corrosion resistance * **Fatigue Performance:** Superior in forged components * **Fracture Toughness:** Good damage tolerance * **Temperature Capability:** Suitable for aerospace service conditions **7175-T736/T7365x Aluminum Alloys** represent specialized solutions for high-performance forged aerospace components where the combination of corrosion resistance, fatigue performance, and structural integrity are critical. These tempers provide an optimal balance of properties for forged applications, making them particularly valuable for aircraft structures that require long-term reliability in demanding service environments. The proven performance of these alloys in aerospace applications demonstrates their capability to meet the most stringent requirements for safety and durability.

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 2193 gallon liquid totes Special package is available on request.