EZ33A (AMS 4396) Magnesium Alloy,E FOUR

### **EZ33A Magnesium Alloy (AMS 4396)** **Product Overview** EZ33A is a magnesium-zinc-rare earth-zirconium casting alloy renowned for its excellent elevated temperature performance and superior pressure tightness. As specified in AMS 4396, this alloy offers exceptional creep resistance and stable mechanical properties at temperatures up to 250°C (482°F), making it particularly suitable for aerospace applications requiring reliable performance in high-temperature environments. The combination of rare earth elements and zirconium provides unique characteristics that distinguish it from conventional magnesium-aluminum alloys. This alloy is typically supplied as sand castings and investment castings, with optimal properties achieved through T5 heat treatment (artificially aged). --- #### **1. Chemical Composition** EZ33A features a sophisticated zinc-rare earth-zirconium system designed for elevated temperature performance. | Element | Composition (% by Weight) | | :---------------- | :-------------------------------- | | **Zinc (Zn)** | 2.0 - 3.1 % | | **Rare Earths (RE)*** | 2.5 - 4.0 % | | **Zirconium (Zr)** | 0.5 - 1.0 % | | **Copper (Cu)** | ≤ 0.10 % | | **Iron (Fe)** | ≤ 0.03 % | | **Nickel (Ni)** | ≤ 0.003 % | | **Silicon (Si)** | ≤ 0.05 % | | **Other Impurities** | ≤ 0.30 % (each) | | **Magnesium (Mg)** | Balance | *Note:* The "Rare Earths" typically consist of cerium-based mischmetal (approximately 50% Ce, 25% La, 20% Nd, 5% Pr). **Zirconium** provides essential grain refinement, while the combination of **zinc and rare earths** forms stable intermetallic compounds that resist coarsening at elevated temperatures. --- #### **2. Physical & Mechanical Properties** EZ33A exhibits stable mechanical properties with excellent retention at elevated temperatures. **Physical Properties:** * **Density:** 1.81 g/cm³ (0.065 lb/in³) * **Melting Range:** 545 - 645 °C (1013 - 1193 °F) * **Coefficient of Thermal Expansion:** 26.0 μm/m·°C (20-200°C) * **Thermal Conductivity:** 113 W/m·K * **Specific Heat Capacity:** 1050 J/kg·K **Typical Mechanical Properties (T5 Temper):** * **Ultimate Tensile Strength (UTS):** 135 - 160 MPa (20 - 23 ksi) * **Tensile Yield Strength (TYS):** 110 - 135 MPa (16 - 20 ksi) * **Elongation:** 2 - 4% * **Compressive Yield Strength:** 110 - 135 MPa (16 - 20 ksi) * **Shear Strength:** 115 - 135 MPa (17 - 20 ksi) * **Fatigue Strength:** 90 - 110 MPa (13 - 16 ksi) * **Hardness:** 55 - 65 HBW * **Modulus of Elasticity:** 45 GPa (6.5 × 10³ ksi) **Elevated Temperature Performance:** * **Excellent creep resistance up to 250°C (482°F)** * **Superior pressure tightness at elevated temperatures** * **Maintains structural integrity at 200-250°C** * **Stable mechanical properties after prolonged thermal exposure** --- #### **3. International Standards & Specifications** EZ33A is recognized by major international standards organizations. * **Aerospace Material Specification:** **AMS 4396** (Primary governing specification) * **ASTM International:** **ASTM B80** (Standard Specification for Magnesium-Alloy Sand Castings) * **SAE International:** **SAE J465** * **UNS Designation:** **UNS M12330** * **Federal Standard:** **QQ-M-56** * **ISO Standards:** **ISO 16220** * **European Standards:** **EN 1753 Mg-Zn3RE2Zr** --- #### **4. Product Applications** EZ33A is extensively used in aerospace and industrial applications requiring reliable performance at elevated temperatures. * **Aerospace & Defense:** * **Aircraft Engine Accessory Housings** * **Gearbox and Transmission Casings** * **Helicopter Transmission Housings** * **Engine Mounting Components** * **Missile Components and Housings** * **Gas Turbine Applications:** * **Compressor Housings** * **Accessory Drive Housings** * **Engine Mount Pads** * **Turbine Component Housings** * **Industrial Applications:** * **High-Temperature Process Equipment** * **Industrial Gearbox Casings** * **Compressor Housings** * **Power Generation Components** * **Military Applications:** * **Military Vehicle Transmission Cases** * **Weapon System Components** * **Radar Equipment Housings** * **Military Electronics Enclosures** --- #### **5. Manufacturing Characteristics** **Casting Performance:** * Good castability with adequate fluidity * Excellent pressure tightness for leak-proof components * Requires proper zirconium grain refinement * Suitable for complex casting geometries * Good dimensional stability **Secondary Processing:** * Good machinability with proper techniques * Excellent response to T5 heat treatment * Requires appropriate corrosion protection * Good surface finish characteristics * Weldable with specialized procedures --- **Summary** **EZ33A Magnesium Alloy (AMS 4396)** represents an important class of rare earth-containing magnesium casting alloys that bridge the gap between conventional magnesium alloys and advanced high-temperature systems. Its balanced composition featuring **zinc, rare earths, and zirconium** provides excellent **elevated temperature performance**, **superior pressure tightness**, and **good castability**. Compliance with **AMS 4396** ensures the material meets stringent aerospace requirements for components operating in high-temperature environments. EZ33A's exceptional creep resistance up to **250°C** and proven reliability in aerospace applications make it a preferred choice for engine components, transmission housings, and other critical parts where thermal stability and leak-proof performance are essential. While newer alloys offer higher strength, EZ33A remains a cost-effective and reliable solution for applications requiring good elevated temperature capabilities and excellent casting characteristics.

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 3438 gallon liquid totes Special package is available on request.