Magnesium EA55B-T6,E FOUR

### **Technical Datasheet: Magnesium Alloy EA55B-T6** --- #### **1. Material Overview** EA55B-T6 is a high-performance, heat-treatable magnesium alloy containing rare earth elements, supplied in the solution heat-treated and artificially aged condition. The **"T6"** temper provides maximum mechanical properties, particularly excellent elevated temperature strength and creep resistance. This alloy represents the premium category of magnesium alloys designed for demanding applications where conventional magnesium alloys are insufficient. --- #### **2. Key Features** - **Exceptional elevated temperature performance** (up to 250°C) - **Superior creep resistance** compared to conventional Mg alloys - **Excellent corrosion resistance** - **Good castability** for complex components - **High strength-to-weight ratio** maintained at elevated temperatures - **Good weldability** and repairability --- #### **3. Chemical Composition (Weight %)** | Element | Composition (%) | |---------|-----------------| | **Rare Earths (RE)** | 4.0–5.0% | | **Zinc (Zn)** | 0.3–1.0% | | **Zirconium (Zr)** | 0.4–1.0% | | **Manganese (Mn)** | ≤ 0.30% | | **Silicon (Si)** | ≤ 0.05% | | **Copper (Cu)** | ≤ 0.05% | | **Iron (Fe)** | ≤ 0.01% | | **Nickel (Ni)** | ≤ 0.005% | | **Other Elements** | ≤ 0.30% | | **Magnesium (Mg)** | Balance | *Note: The rare earth elements (typically neodymium-rich mischmetal) and zirconium provide the exceptional high-temperature properties and grain refinement.* --- #### **4. Mechanical Properties (T6 Temper)** | Property | Room Temperature | 250°C (482°F) | |----------|------------------|---------------| | **Ultimate Tensile Strength** | 270–300 MPa | 180–200 MPa | | **Tensile Yield Strength (0.2%)** | 180–200 MPa | 140–160 MPa | | **Elongation (% in 50mm)** | 4–8% | 8–12% | | **Compressive Yield Strength** | 180–200 MPa | 140–160 MPa | | **Hardness (Brinell)** | 75–85 HB | 55–65 HB | | **Shear Strength** | 150–170 MPa | 100–120 MPa | | **Fatigue Strength** | 110–130 MPa | 80–100 MPa | | **Creep Resistance** | Excellent | Good | --- #### **5. Physical Properties** | Property | Value | |----------|-------| | **Density** | 1.81 g/cm³ | | **Melting Range** | 545–640°C | | **Specific Heat** | 1.05 kJ/kg·K | | **Thermal Conductivity** | 105 W/m·K | | **Coefficient of Thermal Expansion** | 26.8 μm/m·K | | **Modulus of Elasticity** | 44 GPa | --- #### **6. Heat Treatment Cycle (T6)** - **Solution Treatment:** 525°C ± 5°C for 8–12 hours - **Quenching:** Hot water (70–100°C) - **Artificial Aging:** 200°C ± 5°C for 16–24 hours - **Cooling:** Air cool --- #### **7. Applicable Standards** - **ASTM International:** - **ASTM B80** – Magnesium-Alloy Sand Castings - **ASTM B199** – Magnesium-Alloy Permanent Mold Castings - **Aerospace Standards:** - **AMS 4425** – Magnesium Alloy Castings, Sand 4.5RE-0.6Zr-0.6Zn (EZ33A-T5) - **BAC 5731** – Boeing Material Specification - **European Standards:** - **EN 1753** – Magnesium and magnesium alloys - **Proprietary Specifications:** - Various aerospace OEM specifications --- #### **8. Manufacturing Characteristics** - **Casting Methods:** Sand casting, permanent mold casting - **Pouring Temperature:** 720–780°C - **Fluidity:** Good with proper superheat - **Hot Tearing Resistance:** Good (improved by Zr content) - **Machinability:** Good (use sharp tools, adequate cooling) - **Weldability:** Good (TIG welding with proper filler) --- #### **9. Applications** - **Aerospace:** - Jet engine components (gearboxes, compressor housings) - Helicopter transmission housings - Missile and rocket components - Auxiliary power unit (APU) housings - **Racing & High-Performance Automotive:** - Turbocharger housings - High-performance engine blocks - Transmission cases - Suspension components - **Industrial:** - High-temperature pump components - Compressor parts - Nuclear reactor components - Specialized machinery operating at elevated temperatures --- #### **10. Corrosion Performance & Protection** - **Atmospheric Corrosion:** Excellent (superior to conventional Mg alloys) - **Salt Spray Resistance:** >500 hours to initial corrosion - **Recommended Coatings:** Chemical conversion, anodizing, specialized high-temp coatings - **Galvanic Corrosion:** Isolate from dissimilar metals in high-temperature service --- #### **11. Design Guidelines** - **Maximum Service Temperature:** 250°C continuous, 300°C short-term - **Section Thickness:** 3–50 mm recommended - **Stress Analysis:** Consider thermal expansion in design - **Joint Design:** Allow for thermal movement at elevated temperatures --- #### **12. Comparison with Similar Alloys** - **vs. EZ33A-T5:** Better room temperature strength, similar high-temperature performance - **vs. WE43-T6:** Lower cost, slightly lower maximum service temperature - **vs. Conventional Mg Alloys:** Superior high-temperature properties, better corrosion resistance --- **Note:** EA55B-T6 represents a premium magnesium alloy class with exceptional high-temperature capabilities. While more expensive than conventional magnesium alloys, it enables weight savings in applications where no other magnesium alloy can perform. Always consult with materials engineers for specific application requirements and conduct thorough testing for critical applications.

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 3326 gallon liquid totes Special package is available on request.