7108 Aluminum alloy,Aluminum 7108 alloy，E FORU

### **7108 Aluminum Alloy: High-Strength Extrusion Alloy** **7108 Aluminum Alloy** is a high-strength, heat-treatable aluminum-zinc-magnesium alloy specifically developed for extruded products. This alloy offers an excellent combination of high strength, good corrosion resistance, and superior extrusion characteristics, making it particularly suitable for structural applications in transportation and engineering industries. --- #### **1. Chemical Composition** | Element | Content (%) (Typical) | Role in the Alloy | | :--- | :--- | :--- | | **Zinc (Zn)** | 4.5 - 5.5 | Primary strengthening element through formation of MgZn₂ precipitates | | **Magnesium (Mg)** | 0.8 - 1.4 | Enhances strength and age-hardening response | | **Copper (Cu)** | ≤ 0.05 | Impurity element - kept low for corrosion resistance | | **Manganese (Mn)** | 0.05 - 0.20 | Improves strength and grain structure control | | **Chromium (Cr)** | 0.05 - 0.20 | Enhances corrosion resistance and grain structure | | **Zirconium (Zr)** | 0.08 - 0.15 | Controls grain structure and inhibits recrystallization | | **Iron (Fe)** | ≤ 0.20 | Impurity - controlled for improved consistency | | **Silicon (Si)** | ≤ 0.15 | Impurity - controlled 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** | 2.78 g/cm³ (0.100 lb/in³) | | **Melting Range** | 580°C - 655°C (1076°F - 1211°F) | | **Electrical Conductivity** | 42-46% IACS | | **Thermal Conductivity** | 150-170 W/m·K | | **Coefficient of Thermal Expansion** | 23.8 × 10⁻⁶/°C (20-100°C) | | **Modulus of Elasticity** | 70 GPa (10.2 × 10⁶ psi) | --- #### **3. Mechanical Properties (Typical for T6 Temper)** | Property | Typical Value | | :--- | :--- | | **Tensile Ultimate Strength** | 350 - 400 MPa (51 - 58 ksi) | | **Tensile Yield Strength (0.2% Offset)** | 290 - 340 MPa (42 - 49 ksi) | | **Elongation** | 12-16% | | **Compression Yield Strength** | 280 - 330 MPa (41 - 48 ksi) | | **Shear Strength** | 200 - 240 MPa (29 - 35 ksi) | | **Fatigue Strength** | 120 - 150 MPa (17 - 22 ksi) | | **Brinell Hardness** | 95 - 115 HB | --- #### **4. Product Applications** **7108 Aluminum Alloy** is primarily used in extruded structural applications: * **Transportation Industry:** * Automotive structural components * Truck and trailer frames * Railway vehicle components * Bus and coach structures * **Marine Applications:** * Boat and ship structures * Marine platform components * Offshore structures * **Industrial Applications:** * Structural frames and supports * Material handling equipment * Machinery components * Construction elements * **Recreational Products:** * Bicycle frames * Sports equipment * Outdoor structures --- #### **5. International Standards** | Standard Body | Designation | Specification | | :--- | :--- | :--- | | **Aluminum Association** | 7108 | AA Teal Sheets | | **ASTM International** | 7108 | ASTM B221 | | **European Norm** | EN AW-7108 | EN 755-2 | | **Japanese Standards** | A7108 | JIS H 4100 | | **Unified Numbering System** | A97108 | UNS Registry | --- #### **6. Key Characteristics** **Advantages:** * **Excellent extrusion characteristics** * **Good strength-to-weight ratio** * **Superior corrosion resistance** * **Good weldability** * **Excellent fatigue performance** * **Good formability** * **Cost-effective production** **Limitations:** * Lower strength than some other 7xxx series alloys * Limited to extruded product forms * Not suitable for ultra-high strength applications * Requires proper heat treatment for optimal properties --- #### **7. Manufacturing Considerations** * **Extrusion:** Excellent extrudability with good surface finish * **Machining:** Good machinability with proper tooling * **Welding:** Good weldability using conventional methods * **Forming:** Good formability in solution heat-treated condition * **Heat Treatment:** Responds well to artificial aging --- #### **8. Special Features** **7108 Aluminum Alloy** offers specific advantages for extrusion applications: * **Extrusion Performance:** Excellent flow characteristics and surface quality * **Corrosion Resistance:** Superior to many other 7xxx series alloys * **Weldability:** Maintains good properties in welded condition * **Cost Efficiency:** Competitive production costs for extruded products **Heat Treatment Characteristics:** * Solution treatment temperature: 460-480°C * Aging temperature: 120-150°C * Good response to artificial aging * Consistent property development --- #### **9. Performance Characteristics** * **Corrosion Resistance:** Good performance in various environments * **Fatigue Life:** Excellent for structural applications * **Fracture Toughness:** Good damage tolerance * **Stress Corrosion:** Good resistance for zinc-containing alloy **7108 Aluminum Alloy** represents an optimized solution for structural extrusion applications where the combination of good strength, excellent corrosion resistance, and manufacturing efficiency are key requirements. The alloy's balanced composition and processing characteristics make it particularly valuable for transportation and structural applications where reliability, durability, and cost-effectiveness are important considerations. While not reaching the ultra-high strength levels of some other 7xxx alloys, 7108 provides an excellent balance of properties for its intended applications in extruded structural components.

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 2179 gallon liquid totes Special package is available on request.