7108A Aluminum alloy,Aluminum 7108A alloy，E FORU

### **7108A Aluminum Alloy: Advanced High-Strength Extrusion Alloy** **7108A Aluminum Alloy** is an advanced version of the 7108 alloy, specifically optimized for high-strength extruded applications. This alloy maintains the excellent extrusion characteristics of 7108 while offering improved mechanical properties and enhanced performance for demanding structural applications in transportation and engineering sectors. --- #### **1. Chemical Composition** | Element | Content (%) (Typical) | Role in the Alloy | | :--- | :--- | :--- | | **Zinc (Zn)** | 4.8 - 5.8 | Primary strengthening element through formation of MgZn₂ precipitates | | **Magnesium (Mg)** | 0.9 - 1.5 | Enhances strength and age-hardening response | | **Copper (Cu)** | ≤ 0.08 | Controlled impurity for improved corrosion resistance | | **Manganese (Mn)** | 0.08 - 0.25 | Improves strength and grain structure control | | **Chromium (Cr)** | 0.08 - 0.25 | Enhances corrosion resistance and grain structure | | **Zirconium (Zr)** | 0.10 - 0.18 | Controls grain structure and inhibits recrystallization | | **Iron (Fe)** | ≤ 0.15 | Tightly controlled impurity for improved toughness | | **Silicon (Si)** | ≤ 0.12 | Tightly controlled impurity for improved ductility | | **Titanium (Ti)** | ≤ 0.05 | Grain refiner | | **Other Elements** | ≤ 0.05 each; ≤ 0.15 total | - | | **Aluminum (Al)** | Balance | Base metal | --- #### **2. Physical Properties** | Property | Value / Description | | :--- | :--- | | **Density** | 2.79 g/cm³ (0.101 lb/in³) | | **Melting Range** | 580°C - 650°C (1076°F - 1202°F) | | **Electrical Conductivity** | 40-44% IACS | | **Thermal Conductivity** | 145-165 W/m·K | | **Coefficient of Thermal Expansion** | 23.7 × 10⁻⁶/°C (20-100°C) | | **Modulus of Elasticity** | 70.5 GPa (10.2 × 10⁶ psi) | --- #### **3. Mechanical Properties (Typical for T6 Temper)** | Property | Typical Value | | :--- | :--- | | **Tensile Ultimate Strength** | 380 - 430 MPa (55 - 62 ksi) | | **Tensile Yield Strength (0.2% Offset)** | 320 - 370 MPa (46 - 54 ksi) | | **Elongation** | 10-14% | | **Compression Yield Strength** | 310 - 360 MPa (45 - 52 ksi) | | **Shear Strength** | 220 - 260 MPa (32 - 38 ksi) | | **Fatigue Strength** | 130 - 160 MPa (19 - 23 ksi) | | **Brinell Hardness** | 105 - 125 HB | --- #### **4. Product Applications** **7108A Aluminum Alloy** is used in high-performance extruded structural applications: * **Transportation Industry:** * Automotive space frames * Truck chassis components * Railway vehicle structural members * Bus roll bars and safety structures * **Marine and Offshore:** * High-performance boat structures * Marine platform components * Offshore access systems * **Industrial Applications:** * Heavy-duty structural frames * Material handling equipment * Crane and lifting equipment components * **Defense Applications:** * Military vehicle structures * Armored vehicle components * Defense system frameworks * **Recreational Products:** * High-performance bicycle frames * Motorsport components * Adventure sports equipment --- #### **5. International Standards** | Standard Body | Designation | Specification | | :--- | :--- | :--- | | **Aluminum Association** | 7108A | AA Teal Sheets | | **ASTM International** | 7108A | ASTM B221 | | **European Norm** | EN AW-7108A | EN 755-2 | | **German Standards** | AlZn4.5Mg1.5 | DIN 1725 | | **Unified Numbering System** | A97108 | UNS Registry | --- #### **6. Key Characteristics** **Advantages:** * **Enhanced strength** compared to standard 7108 * **Excellent extrusion characteristics** * **Superior corrosion resistance** * **Good weldability** with proper techniques * **Excellent fatigue performance** * **Improved toughness** * **Good stress corrosion cracking resistance** **Limitations:** * Slightly higher cost than standard 7108 * Limited to extruded product forms * Requires precise heat treatment control * Not suitable for ultra-high temperature applications --- #### **7. Manufacturing Considerations** * **Extrusion:** Excellent extrudability with complex profile capabilities * **Machining:** Good machinability with carbide tooling * **Welding:** Good weldability using MIG and TIG methods * **Forming:** Good formability in solution-treated condition * **Heat Treatment:** Requires precise control for optimal properties --- #### **8. Special Features** **7108A Aluminum Alloy** offers enhanced performance characteristics: * **Optimized Composition:** Improved zinc and magnesium balance for better properties * **Enhanced Strength:** Approximately 10-15% higher strength than standard 7108 * **Superior Extrusion Quality:** Excellent surface finish and dimensional accuracy * **Improved Consistency:** Tighter compositional controls for reliable performance **Heat Treatment Process:** * Solution treatment: 465-480°C * Quenching: Controlled rate for optimal properties * Aging: 120-140°C for 8-16 hours * Consistent mechanical property development --- #### **9. Performance Characteristics** * **Corrosion Resistance:** Excellent for marine and industrial environments * **Fatigue Performance:** Superior cyclic loading resistance * **Fracture Toughness:** Good damage tolerance characteristics * **Stress Corrosion Cracking:** Improved resistance over standard alloys **7108A Aluminum Alloy** represents a significant advancement in extrusion alloy technology, offering enhanced mechanical properties while maintaining the excellent manufacturing characteristics of the 7108 series. The "A" designation indicates improved quality controls and optimized composition for better performance in demanding applications. This alloy is particularly valuable for structural components where weight reduction, corrosion resistance, and high strength are critical requirements. The continued development and application of 7108A demonstrate the ongoing evolution of aluminum extrusion alloys to meet increasingly demanding performance specifications in transportation and industrial sectors.

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 2180 gallon liquid totes Special package is available on request.