Magnesium EZ33A-T5,UNS M12330;,E FOUR

### **Technical Datasheet: Magnesium Alloy EZ33A-T5, UNS M12330** --- #### **1. Material Overview** EZ33A-T5 is a magnesium-rare earth-zinc-zirconium alloy supplied in the artificially aged condition. The **"T5"** temper indicates that the castings have undergone **artificial aging only**, without prior solution heat treatment. This alloy is renowned for its excellent pressure tightness, good castability, and superior properties at elevated temperatures up to 250°C. --- #### **2. Key Features** - **Excellent pressure tightness** and low porosity - **Good mechanical properties** at elevated temperatures - **Superior castability** for complex components - **Good corrosion resistance** - **Excellent damping capacity** - **Good weldability** for repairs --- #### **3. Chemical Composition (Weight %)** | Element | Composition (%) | |---------|-----------------| | **Rare Earths (RE)** | 2.5–4.0% | | **Zinc (Zn)** | 2.0–3.1% | | **Zirconium (Zr)** | 0.5–1.0% | | **Manganese (Mn)** | ≤ 0.30% | | **Silicon (Si)** | ≤ 0.05% | | **Copper (Cu)** | ≤ 0.10% | | **Iron (Fe)** | ≤ 0.05% | | **Nickel (Ni)** | ≤ 0.01% | | **Other Elements** | ≤ 0.30% | | **Magnesium (Mg)** | Balance | *Note: The rare earth content typically consists of cerium-rich mischmetal, which contributes to the alloy's excellent high-temperature properties and castability.* --- #### **4. Mechanical Properties (T5 Temper)** | Property | Room Temperature | 200°C (392°F) | 250°C (482°F) | |----------|------------------|---------------|---------------| | **Ultimate Tensile Strength** | 140–160 MPa | 110–130 MPa | 90–110 MPa | | **Tensile Yield Strength (0.2%)** | 95–110 MPa | 80–95 MPa | 70–85 MPa | | **Elongation (% in 50mm)** | 2–4% | 3–6% | 4–8% | | **Compressive Yield Strength** | 95–110 MPa | 80–95 MPa | 70–85 MPa | | **Hardness (Brinell)** | 50–60 HB | 40–50 HB | 35–45 HB | | **Shear Strength** | 115–130 MPa | 95–110 MPa | 80–95 MPa | | **Fatigue Strength** | 70–85 MPa | 55–70 MPa | 45–60 MPa | --- #### **5. Physical Properties** | Property | Value | |----------|-------| | **Density** | 1.79 g/cm³ | | **Melting Range** | 545–640°C | | **Specific Heat** | 1.05 kJ/kg·K | | **Thermal Conductivity** | 113 W/m·K | | **Coefficient of Thermal Expansion** | 27.5 μm/m·K | | **Modulus of Elasticity** | 44 GPa | --- #### **6. Heat Treatment (T5)** - **Aging Temperature:** 325°C ± 5°C for 5–8 hours - **Cooling Method:** Air cooling - **Aging Effect:** Improves dimensional stability and mechanical properties - **No Solution Treatment Required** --- #### **7. Applicable Standards** - **ASTM International:** - **ASTM B80** – Standard Specification for Magnesium-Alloy Sand Castings - **ASTM B199** – Standard Specification for Magnesium-Alloy Permanent Mold Castings - **Aerospace Standards:** - **AMS 4425** – Magnesium Alloy Castings, Sand 3.3RE-2.6Zn-0.7Zr (EZ33A-T5) - **SAE International:** - **SAE J465** – Magnesium Alloy Castings - **Unified Numbering System:** - **UNS M12330** - **Military Standards:** - **MIL-M-46062** – Magnesium Alloy Castings, High Strength --- #### **8. Manufacturing Characteristics** - **Casting Methods:** Excellent for sand casting and permanent mold casting - **Pouring Temperature:** 700–760°C - **Fluidity:** Excellent - **Pressure Tightness:** Superior – suitable for pressure-containing applications - **Hot Tearing Resistance:** Very good - **Machinability:** Excellent - **Weldability:** Good (TIG welding recommended) --- #### **9. Applications** - **Aerospace Components:** - Aircraft gearbox housings - Transmission cases - Engine accessory cases - Helicopter transmission housings - **Automotive Applications:** - Transmission cases - Engine components - Pump housings - **Industrial Equipment:** - Compressor housings - Pump casings - High-temperature instrument housings - **Military Applications:** - Military vehicle transmission cases - Weapon system components --- #### **10. Corrosion Performance & Protection** - **Atmospheric Corrosion:** Good resistance - **Salt Spray Performance:** Moderate (requires protection for marine environments) - **Recommended Coatings:** Chemical conversion coatings, anodizing, paint systems - **Galvanic Corrosion:** Standard isolation practices required --- #### **11. Design Guidelines** - **Maximum Service Temperature:** 250°C continuous - **Pressure Applications:** Excellent for pressure-containing components - **Section Thickness:** 3–75 mm recommended - **Dimensional Stability:** Good for precision applications --- #### **12. Comparison with Similar Alloys** - **vs. ZE41A-T5:** Better high-temperature properties and castability - **vs. ZK51A-T5:** Superior pressure tightness and high-temperature performance - **vs. AZ91-T6:** Better high-temperature properties but lower room temperature strength --- **Note:** EZ33A-T5 is particularly valued for applications requiring excellent pressure tightness and good elevated temperature performance. Its combination of castability, pressure tightness, and thermal stability makes it ideal for aerospace transmission and gearbox applications. The T5 temper provides good dimensional stability and mechanical properties without the need for solution heat treatment, making it cost-effective for many 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 3332 gallon liquid totes Special package is available on request.