Elektron W19 Magnesium Alloy，EQ21,E FOUR

### **Elektron W19 / EQ21 Magnesium Alloy** **Product Overview** Elektron W19, commercially designated as EQ21, is a premium high-strength magnesium-silver-rare earth-zirconium casting alloy engineered for exceptional performance at elevated temperatures. As part of the advanced Mg-Ag-RE system, EQ21 offers superior creep resistance and mechanical properties retention at temperatures up to 300°C, making it suitable for the most demanding aerospace and racing applications. The alloy represents a significant advancement in magnesium technology, providing reliable performance under extreme thermal and mechanical stress conditions. This alloy is typically supplied as sand castings and investment castings, with optimal properties achieved through specialized heat treatment cycles. --- #### **1. Chemical Composition** EQ21 features a sophisticated silver-rare earth composition designed for maximum high-temperature performance. | Element | Composition (% by Weight) | | :---------------- | :-------------------------------- | | **Silver (Ag)** | 1.3 - 2.5 % | | **Rare Earths (RE)*** | 1.5 - 3.0 % | | **Zirconium (Zr)** | 0.4 - 1.0 % | | **Zinc (Zn)** | ≤ 0.3 % | | **Manganese (Mn)** | ≤ 0.3 % | | **Copper (Cu)** | ≤ 0.03 % | | **Iron (Fe)** | ≤ 0.03 % | | **Nickel (Ni)** | ≤ 0.003 % | | **Silicon (Si)** | ≤ 0.03 % | | **Other Impurities** | ≤ 0.30 % (each) | | **Magnesium (Mg)** | Balance | *Note:* The "Rare Earths" typically include neodymium and gadolinium. **Silver** significantly enhances age-hardening response and strength, while **rare earth elements** form stable intermetallic compounds that resist coarsening at elevated temperatures. **Zirconium** provides essential grain refinement. --- #### **2. Physical & Mechanical Properties** EQ21 demonstrates outstanding mechanical properties across a wide temperature range. **Physical Properties:** * **Density:** ~1.82 g/cm³ (0.066 lb/in³) * **Melting Range:** ~ 545 - 640 °C (1013 - 1184 °F) * **Coefficient of Thermal Expansion:** 26.5 μm/m·°C (20-200°C) * **Thermal Conductivity:** 51 W/m·K **Typical Mechanical Properties (T6 Condition):** * **Ultimate Tensile Strength (UTS):** 240 - 260 MPa (35 - 38 ksi) * **Tensile Yield Strength (TYS):** 185 - 205 MPa (27 - 30 ksi) * **Elongation:** 2 - 5% * **Compressive Yield Strength:** 185 - 205 MPa (27 - 30 ksi) * **Shear Strength:** ~ 125 MPa (18 ksi) * **Hardness:** 75 - 85 HBW * **Modulus of Elasticity:** 45 GPa (6.5 × 10³ ksi) **Elevated Temperature Performance (Key Advantage):** * **Exceptional creep resistance up to 300°C (572°F)** * **Excellent strength retention at 250°C** * **Stable microstructure under prolonged thermal exposure** * **Superior performance compared to conventional magnesium alloys** --- #### **3. International Standards & Specifications** EQ21 is covered by several key international and aerospace standards. * **Aerospace Material Specification (AMS):** **AMS 4429** (Primary specification for sand castings) * **ASTM International:** **ASTM B80** (Referenced for sand casting specifications) * **Proprietary Designation:** **Elektron EQ21** / **W19** (Luxfer MEL Technologies) * **Aerospace Standards:** Approved under material specifications of major aerospace manufacturers --- #### **4. Product Applications** EQ21 is specified for the most demanding applications in aerospace and high-performance sectors. * **Aerospace & Gas Turbine Engines:** * **Engine Compressor Casings** * **Transmission and Gearbox Housings** * **Engine Accessory Drive Housings** * **Turbine Component Housings** * **Aircraft Auxiliary Power Unit (APU) Casings** * **Defense & Military:** * **Missile Components and Housings** * **Military Aircraft Engine Parts** * **Defense System Components** * **High-Performance Motorsports:** * **Formula 1 Gearbox Casings** * **Racing Engine Components** * **High-Performance Turbocharger Housings** * **Specialized Industrial:** * **High-Temperature Process Equipment** * **Nuclear Industry Components** --- #### **5. Manufacturing Characteristics** **Casting Performance:** * Good castability with proper foundry techniques * Requires controlled solidification conditions * Suitable for complex geometries * Good dimensional stability * Responsive to heat treatment **Secondary Processing:** * Good machinability with proper techniques * Excellent response to T6 heat treatment * Requires appropriate corrosion protection * Suitable for conventional surface treatments * Weldable with specialized procedures --- **Summary** **Elektron W19 / EQ21 Magnesium Alloy** represents the pinnacle of magnesium casting technology for elevated temperature applications. Its sophisticated **silver-rare earth-zirconium** composition delivers exceptional **creep resistance** and **mechanical property retention** at temperatures up to **300°C**, outperforming most other commercial magnesium alloys. The alloy's certification to **AMS 4429** ensures its reliability for critical aerospace components in gas turbine engines and other extreme environment applications. While the alloy commands a premium cost due to its silver content and specialized processing requirements, its superior high-temperature performance justifies the investment for applications where conventional magnesium alloys cannot meet performance demands. EQ21 continues to push the boundaries of magnesium alloy capabilities, enabling weight reduction in applications previously considered beyond the scope of magnesium materials.

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 3420 gallon liquid totes Special package is available on request.