7140 Aluminum alloy,Aluminum 7140 alloy，E FORU

### **7140 Aluminum Alloy: High-Strength Automotive Alloy** **7140 Aluminum Alloy** is a heat-treatable aluminum-zinc-magnesium alloy specifically developed for automotive structural applications requiring high strength, excellent energy absorption, and good formability. This alloy represents an advanced solution for lightweight vehicle structures where crash performance and weight reduction are critical design considerations. --- #### **1. Chemical Composition** | Element | Content (%) (Typical) | Role in the Alloy | | :--- | :--- | :--- | | **Zinc (Zn)** | 6.0 - 7.0 | Primary strengthening element through formation of MgZn₂ precipitates | | **Magnesium (Mg)** | 2.0 - 2.8 | Enhances strength and age-hardening response | | **Copper (Cu)** | 0.50 - 1.0 | Improves strength and stress corrosion resistance | | **Iron (Fe)** | ≤ 0.12 | Tightly controlled impurity for improved consistency | | **Silicon (Si)** | ≤ 0.10 | Tightly controlled impurity for improved ductility | | **Manganese (Mn)** | 0.05 - 0.20 | Grain structure control | | **Chromium (Cr)** | 0.10 - 0.25 | Enhances corrosion resistance and grain structure | | **Zirconium (Zr)** | 0.08 - 0.16 | Grain refiner and recrystallization inhibitor | | **Titanium (Ti)** | ≤ 0.08 | 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** | 545°C - 635°C (1013°F - 1175°F) | | **Electrical Conductivity** | 36-40% IACS | | **Thermal Conductivity** | 135-150 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** | 460 - 520 MPa (67 - 75 ksi) | | **Tensile Yield Strength (0.2% Offset)** | 410 - 470 MPa (59 - 68 ksi) | | **Elongation** | 9-13% | | **Compression Yield Strength** | 400 - 460 MPa (58 - 67 ksi) | | **Shear Strength** | 260 - 300 MPa (38 - 44 ksi) | | **Fatigue Strength** | 160 - 190 MPa (23 - 28 ksi) | | **Brinell Hardness** | 125 - 145 HB | --- #### **4. Product Applications** **7140 Aluminum Alloy** is extensively used in critical automotive structural applications: * **Automotive Safety Components:** * Bumper reinforcement systems * Crash boxes and energy absorbers * Door intrusion beams * Side impact protection systems * Front and rear rail structures * **Body-in-White Applications:** * Pillar reinforcements (A, B, C pillars) * Roof rails and headers * Floor cross members and sills * Body structural reinforcements * **Chassis and Suspension:** * Chassis frame components * Suspension mounting brackets * Subframe components * **Commercial Vehicles:** * Truck frame components * Bus structural members * Heavy vehicle safety components --- #### **5. International Standards** | Standard Body | Designation | Specification | | :--- | :--- | :--- | | **Aluminum Association** | 7140 | AA Teal Sheets | | **ASTM International** | 7140 | ASTM B209 | | **European Norm** | EN AW-7140 | EN 485-2 | | **Japanese Standards** | A7140 | JIS H 4000 | | **Unified Numbering System** | A97140 | UNS Registry | --- #### **6. Key Characteristics** **Advantages:** * **Exceptional energy absorption** capabilities * **High strength-to-weight ratio** * **Excellent crash performance** * **Good formability** in T4 temper condition * **Superior fatigue resistance** * **Good weldability** and joinability * **Cost-effective** for automotive mass production **Limitations:** * Requires precise heat treatment control * Limited to sheet and extruded product forms * Requires corrosion protection in harsh environments * Higher cost than conventional automotive alloys --- #### **7. Manufacturing Considerations** * **Stamping:** Good formability in solution heat-treated condition * **Welding:** Excellent spot weldability and MIG welding compatibility * **Heat Treatment:** Strong response to artificial aging and paint bake cycles * **Joining:** Compatible with adhesive bonding and mechanical fastening * **Surface Treatment:** Good paint adhesion and coating compatibility --- #### **8. Special Features** **7140 Aluminum Alloy** offers unique advantages for automotive safety applications: * **Crash Energy Management:** Superior energy absorption in impact scenarios * **Weight Reduction:** Up to 50% weight savings compared to steel components * **Manufacturing Flexibility:** Compatible with high-volume production processes * **Property Optimization:** Excellent balance between strength and ductility **Automotive Performance Benefits:** - Enhanced vehicle safety ratings - Improved fuel efficiency through weight reduction - Reduced greenhouse gas emissions - Maintains structural integrity in crash scenarios --- #### **9. Performance Characteristics** * **Crash Performance:** Excellent energy absorption per unit mass * **Fatigue Life:** Superior durability under cyclic loading * **Corrosion Resistance:** Adequate with proper surface protection * **Impact Toughness:** Good resistance to dynamic loading **7140 Aluminum Alloy** represents the forefront of automotive aluminum technology, specifically engineered to address the dual challenges of vehicle lightweighting and enhanced safety performance. The alloy's optimized composition delivers an exceptional combination of high strength and energy absorption characteristics, making it particularly valuable for automotive safety-critical components where crashworthiness and weight reduction are paramount. The alloy's compatibility with standard automotive manufacturing processes and its consistent performance have established it as a key material in the automotive industry's pursuit of safer, more efficient, and environmentally friendly vehicles.

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 2185 gallon liquid totes Special package is available on request.