Magnesium EA65B-T6,E FOUR

### **Technical Datasheet: Magnesium Alloy EA65B-T6** --- #### **1. Material Overview** EA65B-T6 is a high-performance magnesium alloy with rare earth elements, supplied in the solution heat-treated and artificially aged condition. This alloy is specifically engineered for applications requiring exceptional strength and creep resistance at elevated temperatures, offering superior performance compared to conventional magnesium alloys in demanding environments. --- #### **2. Key Features** - **Excellent high-temperature strength** (up to 300°C) - **Outstanding creep resistance** - **Superior corrosion performance** - **Good castability and dimensional stability** - **Excellent fatigue strength** - **Good weldability with proper procedures** --- #### **3. Chemical Composition (Weight %)** | Element | Composition (%) | |---------|-----------------| | **Rare Earths (RE)** | 5.5–6.5% | | **Zinc (Zn)** | 0.4–1.0% | | **Zirconium (Zr)** | 0.5–1.0% | | **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 optimized rare earth composition (typically neodymium-rich with gadolinium additions) combined with zirconium provides exceptional high-temperature stability and strength retention.* --- #### **4. Mechanical Properties (T6 Temper)** | Property | Room Temperature | 250°C (482°F) | 300°C (572°F) | |----------|------------------|---------------|---------------| | **Ultimate Tensile Strength** | 290–320 MPa | 200–230 MPa | 160–190 MPa | | **Tensile Yield Strength (0.2%)** | 200–230 MPa | 160–190 MPa | 130–160 MPa | | **Elongation (% in 50mm)** | 4–7% | 6–10% | 8–12% | | **Hardness (Brinell)** | 80–90 HB | 60–70 HB | 50–60 HB | | **Shear Strength** | 160–180 MPa | 110–130 MPa | 90–110 MPa | | **Fatigue Strength** | 120–140 MPa | 90–110 MPa | 70–90 MPa | --- #### **5. Physical Properties** | Property | Value | |----------|-------| | **Density** | 1.84 g/cm³ | | **Melting Range** | 548–642°C | | **Specific Heat** | 1.00 kJ/kg·K | | **Thermal Conductivity** | 92 W/m·K | | **Coefficient of Thermal Expansion** | 26.2 μm/m·K | | **Modulus of Elasticity** | 44.5 GPa | --- #### **6. Heat Treatment Cycle (T6)** - **Solution Treatment:** 530°C ± 5°C for 8–12 hours - **Quenching:** Hot water (70–100°C) - **Artificial Aging:** 210°C ± 5°C for 16–24 hours - **Cooling:** Air cool - **Microstructure:** Fine-grained with uniform precipitate distribution --- #### **7. Applicable Standards** - **ASTM International:** - **ASTM B80** – Magnesium-Alloy Sand Castings - **ASTM B199** – Magnesium-Alloy Permanent Mold Castings - **Aerospace Standards:** - **AMS 4429** – Magnesium Alloy Castings - **BAC 5731** – Boeing Material Specification - **European Standards:** - **EN 1753** – Magnesium and magnesium alloys - **Military Standards:** - **MIL-M-46062** – Magnesium Alloy Castings, High Strength --- #### **8. Manufacturing Characteristics** - **Casting Methods:** Sand casting, permanent mold casting - **Pouring Temperature:** 725–785°C - **Fluidity:** Very good with proper superheat - **Hot Tearing Resistance:** Excellent - **Machinability:** Good (use sharp tools and adequate cooling) - **Weldability:** Good (TIG welding with proper filler wire) --- #### **9. Applications** - **Aerospace:** - Jet engine compressor housings - Gearbox and transmission cases - Missile components - Rocket motor cases - Auxiliary power unit components - **Defense:** - Military aircraft components - Armored vehicle parts - Portable weapon system components - **High-Performance Automotive:** - Turbocharger housings - High-temperature engine components - Racing transmission cases - **Energy Industry:** - Nuclear reactor components - Geothermal equipment - High-temperature pump parts --- #### **10. Corrosion Performance & Protection** - **Salt Spray Resistance:** >800 hours to initial corrosion - **Galvanic Corrosion:** Requires isolation in mixed-metal assemblies - **High-Temperature Oxidation:** Excellent up to 400°C - **Recommended Coatings:** High-temperature conversion coatings, specialized paints --- #### **11. Design Guidelines** - **Maximum Service Temperature:** 300°C continuous, 350°C short-term - **Section Thickness:** 4–75 mm recommended - **Thermal Expansion:** Consider in high-temperature designs - **Stress Analysis:** Account for strength retention at temperature --- #### **12. Comparison with Similar Alloys** - **vs. EA55B-T6:** Higher strength, better high-temperature performance - **vs. WE43-T6:** Superior creep resistance, comparable corrosion resistance - **vs. Conventional Mg Alloys:** Significantly better high-temperature capabilities --- **Note:** EA65B-T6 represents the premium category of high-temperature magnesium alloys, offering performance characteristics that approach some aluminum alloys while maintaining the weight advantage of magnesium. Its combination of mechanical properties, corrosion resistance, and high-temperature stability makes it suitable for the most demanding applications. Comprehensive testing and consultation with materials engineers are recommended 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 3328 gallon liquid totes Special package is available on request.