Elektron W5 Magnesium Alloy，AM21,E FOUR

### **Elektron W5 / AM20S Magnesium Alloy** **Product Overview** Elektron W5, commercially designated as AM20S, is a high-ductility magnesium-aluminum-manganese casting alloy specifically engineered to provide exceptional toughness, impact resistance, and energy absorption capabilities. With the lowest aluminum content among commercial Mg-Al alloys, AM20S offers superior elongation and ductility, making it particularly suitable for automotive safety components and applications requiring maximum vibration damping and impact performance. The alloy represents the premium choice where ductility and energy absorption are more critical than ultimate tensile strength. This alloy is primarily supplied as high-pressure die castings, with optimized properties for safety-critical applications in automotive and other demanding industries. --- #### **1. Chemical Composition** AM20S features a low-aluminum composition that maximizes ductility while maintaining adequate strength. | Element | Composition (% by Weight) | | :---------------- | :-------------------------------- | | **Aluminum (Al)** | 1.7 - 2.5 % | | **Manganese (Mn)** | 0.20 - 0.40 % | | **Zinc (Zn)** | ≤ 0.10 % | | **Silicon (Si)** | ≤ 0.08 % | | **Copper (Cu)** | ≤ 0.008 % | | **Iron (Fe)** | ≤ 0.004 % | | **Nickel (Ni)** | ≤ 0.001 % | | **Other Impurities** | ≤ 0.01 % (each) | | **Magnesium (Mg)** | Balance | *Note:* The low **aluminum** content minimizes the formation of the brittle Mg₁₇Al₁₂ phase, resulting in exceptional ductility. **Manganese** provides corrosion resistance by controlling iron impurities, while the strict limits on **zinc** and other impurities ensure maximum toughness and impact performance. --- #### **2. Physical & Mechanical Properties** AM20S exhibits outstanding ductility and energy absorption characteristics. **Physical Properties:** * **Density:** 1.76 g/cm³ (0.064 lb/in³) * **Melting Range:** 610 - 630 °C (1130 - 1166 °F) * **Coefficient of Thermal Expansion:** 25.8 μm/m·°C (20-200°C) * **Thermal Conductivity:** 78 W/m·K * **Specific Heat Capacity:** 1050 J/kg·K **Typical Mechanical Properties (As-Die Cast):** * **Ultimate Tensile Strength (UTS):** 180 - 210 MPa (26 - 30 ksi) * **Tensile Yield Strength (TYS):** 90 - 110 MPa (13 - 16 ksi) * **Elongation:** 12 - 20% * **Compressive Yield Strength:** 90 - 110 MPa (13 - 16 ksi) * **Impact Strength (Charpy):** 8 - 12 J (6 - 9 ft·lb) * **Fatigue Strength:** 90 - 110 MPa (13 - 16 ksi) * **Hardness:** 45 - 55 HBW * **Modulus of Elasticity:** 45 GPa (6.5 × 10³ ksi) **Special Characteristics:** * **Exceptional energy absorption capacity** * **Superior vibration damping characteristics** * **Excellent impact resistance at room and low temperatures** * **Outstanding ductility in thin-walled sections** * **Good fatigue resistance under cyclic loading** --- #### **3. International Standards & Specifications** AM20S is recognized by major international standards organizations. * **ASTM International:** **ASTM B94** (Standard Specification for Magnesium-Alloy Die Castings) * **ISO Standards:** **ISO 16220** (Magnesium and magnesium alloys - Castings) * **SAE International:** **SAE J465** * **UNS Designation:** **UNS M10200** * **German Standards:** **DIN EN 1753 Mg-Al2Mn** * **Japanese Standards:** **JIS H 5303** * **Automotive Standards:** Various OEM specifications * **Proprietary Designation:** **Elektron W5 / AM20S** (Luxfer MEL Technologies) --- #### **4. Product Applications** AM20S is predominantly used in safety-critical applications where maximum ductility and energy absorption are required. * **Automotive Safety Components:** * **Steering Wheel Armatures and Cores** * **Seat Frame Structures and Adjusters** * **Instrument Panel Support Structures** * **Steering Column Components** * **Airbag Housing and Retainer Assemblies** * **Automotive Structural Applications:** * **Wheel Rims** * **Bracket and Mounting Systems** * **Pedal Support Structures** * **Consumer and Industrial Applications:** * **Power Tool Housings Requiring Impact Resistance** * **Sports Equipment** * **Portable Electronic Device Frames** * **Vibration-Sensitive Instrument Housings** * **Aerospace and Defense:** * **Aircraft Seat Components** * **Equipment Housings Requiring High Damping** * **Military Electronics Enclosures** --- #### **5. Manufacturing Characteristics** **Die Casting Performance:** * Excellent fluidity for thin-walled castings (1.0-1.5 mm) * Low hot tearing tendency * Good dimensional stability * Fast cycle times in high-pressure die casting * Excellent reproducibility in mass production **Secondary Processing:** * Excellent machinability with superior surface finish * Outstanding vibration damping during machining operations * Good weldability using TIG and MIG processes * Excellent paint adhesion and coating compatibility * Good response to surface treatments --- **Summary** **Elektron W5 / AM20S Magnesium Alloy** represents the ultimate in ductility and energy absorption among commercial magnesium casting alloys. Its low **aluminum content** and strict impurity control deliver exceptional **toughness**, **impact resistance**, and **vibration damping** capabilities that are unmatched by higher-strength magnesium alloys. Compliance with international standards including **ASTM B94** and **ISO 16220** ensures consistent quality and performance in safety-critical applications. AM20S has established itself as the premium choice for automotive safety components, particularly steering wheels and seat structures, where its superior energy absorption characteristics and proven reliability contribute significantly to occupant safety. The alloy continues to be specified across multiple industries where maximum ductility, impact resistance, and vibration damping are essential design requirements, offering engineers a lightweight material solution that prioritizes safety and energy management over ultimate strength.

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 3411 gallon liquid totes Special package is available on request.