Magnesium AS21X1, Die Cast,E FOUR

**Product Data Sheet: Magnesium AS21X1, Die Cast** --- **1. Overview** Magnesium AS21X1 is a high-temperature magnesium-aluminum-silicon die casting alloy designed for applications requiring improved creep resistance at elevated temperatures. The addition of silicon forms magnesium silicide (Mg₂Si) precipitates that enhance thermal stability and creep performance, making it suitable for automotive powertrain components and other high-temperature applications. --- **2. International Standards** - **ASTM**: B93 (Castings) - **EN**: 1753 MC21310 - **ISO**: 16220 - **SAE**: J465 - **DIN**: MgAl2Si - **JIS**: H 5303 - **GB/T**: 19078 (Chinese Standard) --- **3. Chemical Composition (wt%)** | Element | Minimum | Maximum | |------------------|--------------|--------------| | Magnesium (Mg) | Balance | Balance | | Aluminum (Al) | 1.9 | 2.5 | | Silicon (Si) | 0.7 | 1.2 | | Manganese (Mn) | 0.20 | 0.40 | | Zinc (Zn) | – | 0.10 | | Copper (Cu) | – | 0.05 | | Iron (Fe) | – | 0.004 | | Nickel (Ni) | – | 0.005 | | Other Impurities | – | 0.30 | --- **4. Physical Properties** | Property | Value | |-------------------------------|---------------------------------| | Density | 1.76 g/cm³ (0.063 lb/in³) | | Melting Range | 580-630°C (1076-1166°F) | | Thermal Conductivity | 84 W/m·K (at 25°C) | | Electrical Resistivity | 10.5 nΩ·m | | Coefficient of Thermal Expansion | 25.8 μm/m·°C (20-100°C) | | Specific Heat Capacity | 1060 J/kg·K | | Solidification Shrinkage | 3.8% | --- **5. Mechanical Properties (As-Die Cast)** | Property | Value (Room Temp) | Value (150°C) | |-------------------------------|---------------------|---------------------| | Tensile Strength | 170-190 MPa | 120-140 MPa | | Yield Strength (0.2% Offset) | 90-110 MPa | 70-85 MPa | | Elongation (% in 50 mm) | 10-15% | 15-25% | | Hardness (Brinell) | 50-55 HB | 35-40 HB | | Fatigue Strength | 75-85 MPa | 50-60 MPa | | Modulus of Elasticity | 45 GPa | 42 GPa | | Creep Resistance (150°C/50MPa)| – | >100 hours | --- **6. Die Casting Characteristics** - Good fluidity and mold filling capability - Moderate castability for thin-walled sections (2.0-3.0 mm) - Low hot tearing tendency - Reduced die soldering tendency - Moderate cycling times (25-50 seconds) - Good surface finish (Ra 0.8-1.2 μm) --- **7. Typical Die Casting Parameters** - Melt Temperature: 670-700°C (1238-1292°F) - Die Temperature: 220-280°C (428-536°F) - Injection Pressure: 45-85 MPa (6500-12300 psi) - Gate Velocity: 30-60 m/s - Fill Time: 20-100 ms - Intensification Pressure: 65-105 MPa (9400-15200 psi) --- **8. High-Temperature Performance** - Maximum service temperature: 175°C (347°F) - Excellent creep resistance up to 150°C (302°F) - Good thermal stability - Minimal aging effects at elevated temperatures - Superior high-temperature properties compared to AZ and AM series alloys --- **9. Applications** - **Automotive**: Engine blocks, transmission cases, oil pans, valve covers - **Powertrain**: Engine brackets, gearbox components, clutch housings - **Aerospace**: Engine accessory housings, thermal management components - **Industrial**: High-temperature machinery components, pump housings - **Electronics**: Heat sink components, power electronics enclosures --- **10. Corrosion Resistance** - Good atmospheric corrosion resistance - Enhanced high-temperature oxidation resistance - Suitable for automotive under-hood applications - Compatible with standard protective treatments: - Chromate-free conversion coatings - Anodizing processes - High-temperature paint systems - Powder coating --- **11. Fabrication & Secondary Operations** - **Machining**: Good machinability with proper tooling - **Joining**: Suitable for adhesive bonding and mechanical fastening - **Heat Treatment**: Generally used in as-cast condition - **Finishing**: Good response to surface treatments --- **12. Key Advantages** - Superior creep resistance at elevated temperatures - Excellent thermal stability - Good high-temperature strength retention - Low thermal expansion coefficient - Good castability for complex shapes - Excellent strength-to-weight ratio at high temperatures --- **13. Design Considerations** - Ideal for components operating at 120-175°C - Suitable for applications requiring long-term thermal stability - Excellent for powertrain and engine components - Good for parts subject to thermal cycling - Recommended for applications where creep resistance is critical --- **14. Quality Assurance & Testing** - Chemical analysis per ASTM E1097 - Mechanical testing per ASTM B557 - High-temperature testing per ASTM E21 - Creep testing per ASTM E139 - Radiographic inspection - Pressure testing for sealing applications --- **15. Comparative High-Temperature Performance** | Property (at 150°C) | AS21X1 | AZ91D | AM60B | |-----------------------------|-------------|-------------|-------------| | Tensile Strength (MPa) | 120-140 | 80-100 | 90-110 | | Creep Resistance (150°C/50MPa) | >100 hrs | <50 hrs | <30 hrs | | Yield Strength Retention | 65% | 45% | 55% | | Thermal Stability | Excellent | Good | Fair | --- *Note: Mechanical properties may vary with wall thickness, casting parameters, and component design. For high-temperature applications, comprehensive testing and validation under actual service conditions are essential. Always consult with materials engineers for application-specific recommendations and ensure compliance with all relevant industry standards and regulations.*

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 3281 gallon liquid totes Special package is available on request.