7149 Aluminum alloy,Aluminum 7149 alloy，E FORU

### **7149 Aluminum Alloy: High-Strength Automotive Alloy** **7149 Aluminum Alloy** is a heat-treatable aluminum-zinc-magnesium alloy specifically designed for automotive structural applications requiring high strength, excellent energy absorption characteristics, and good formability. This alloy provides an optimal balance between mechanical performance and manufacturing efficiency for safety-critical automotive components. --- #### **1. Chemical Composition** | Element | Content (%) (Typical) | Role in the Alloy | | :--- | :--- | :--- | | **Zinc (Zn)** | 6.5 - 7.5 | Primary strengthening element through formation of MgZn₂ precipitates | | **Magnesium (Mg)** | 2.2 - 3.0 | Enhances strength and age-hardening response | | **Copper (Cu)** | 0.60 - 1.1 | Improves strength and stress corrosion resistance | | **Iron (Fe)** | ≤ 0.15 | Tightly controlled impurity | | **Silicon (Si)** | ≤ 0.12 | Tightly controlled impurity | | **Manganese (Mn)** | 0.05 - 0.20 | Grain structure control | | **Chromium (Cr)** | 0.10 - 0.25 | Enhances corrosion resistance | | **Zirconium (Zr)** | 0.08 - 0.16 | Grain refiner and recrystallization inhibitor | | **Titanium (Ti)** | ≤ 0.10 | Grain refiner | | **Other Elements** | ≤ 0.05 each; ≤ 0.15 total | - | | **Aluminum (Al)** | Balance | Base metal | --- #### **2. Physical Properties** | Property | Value / Description | | :--- | :--- | | **Density** | 2.81 g/cm³ (0.101 lb/in³) | | **Melting Range** | 540°C - 635°C (1004°F - 1175°F) | | **Electrical Conductivity** | 35-39% IACS | | **Thermal Conductivity** | 130-145 W/m·K | | **Coefficient of Thermal Expansion** | 23.5 × 10⁻⁶/°C (20-100°C) | | **Modulus of Elasticity** | 71 GPa (10.3 × 10⁶ psi) | --- #### **3. Mechanical Properties (Typical for T6 Temper)** | Property | Typical Value | | :--- | :--- | | **Tensile Ultimate Strength** | 480 - 540 MPa (70 - 78 ksi) | | **Tensile Yield Strength (0.2% Offset)** | 430 - 490 MPa (62 - 71 ksi) | | **Elongation** | 8-12% | | **Compression Yield Strength** | 420 - 480 MPa (61 - 70 ksi) | | **Shear Strength** | 270 - 310 MPa (39 - 45 ksi) | | **Fatigue Strength** | 165 - 195 MPa (24 - 28 ksi) | | **Brinell Hardness** | 130 - 150 HB | --- #### **4. Product Applications** **7149 Aluminum Alloy** is primarily used in automotive safety structural applications: * **Automotive Safety Structures:** * Bumper reinforcement systems * Crash management components * Door intrusion beams * Side impact protection systems * Front and rear crash rails * **Body-in-White Components:** * A-pillar reinforcements * B-pillar reinforcements * Roof rail structures * Floor cross members * Body structural reinforcements * **Chassis Applications:** * Chassis frame components * Suspension mounting points * Subframe members * **Commercial Vehicles:** * Truck frame components * Bus roll-over protection * Heavy vehicle safety structures --- #### **5. International Standards** | Standard Body | Designation | Specification | | :--- | :--- | :--- | | **Aluminum Association** | 7149 | AA Teal Sheets | | **ASTM International** | 7149 | ASTM B209 | | **European Norm** | EN AW-7149 | EN 485-2 | | **Japanese Standards** | A7149 | JIS H 4000 | | **Unified Numbering System** | A97149 | UNS Registry | --- #### **6. Key Characteristics** **Advantages:** * **High strength-to-weight ratio** * **Excellent energy absorption** capabilities * **Superior crash performance** * **Good formability** in T4 condition * **Excellent fatigue resistance** * **Good weldability** * **Cost-effective** for automotive production **Limitations:** * Requires controlled heat treatment * Limited to sheet product forms * Requires corrosion protection * Higher cost than standard automotive alloys --- #### **7. Manufacturing Considerations** * **Stamping:** Good formability in solution-treated condition * **Welding:** Excellent spot weldability * **Heat Treatment:** Strong paint bake response * **Joining:** Suitable for adhesive bonding * **Surface Treatment:** Good paint adhesion --- #### **8. Special Features** **7149 Aluminum Alloy** offers specific advantages: * **Crash Energy Management:** Superior impact energy absorption * **Weight Reduction:** Significant mass savings over steel * **Manufacturing Compatibility:** High-volume production suitable * **Property Consistency:** Reliable mechanical performance **Automotive Benefits:** - Enhanced vehicle safety performance - Improved fuel efficiency - Reduced emissions - Maintains structural integrity --- #### **9. Performance Characteristics** * **Crash Performance:** Excellent energy absorption * **Fatigue Life:** Good durability * **Corrosion Resistance:** Adequate with protection * **Impact Toughness:** Good dynamic performance **7149 Aluminum Alloy** represents advanced automotive aluminum technology, providing an optimal solution for safety-critical components where crash performance and weight reduction are essential requirements for modern vehicle 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 2186 gallon liquid totes Special package is available on request.