Magnesium ZE63A-T6, UNS M16630; Mg; ASTM B 93 (Ingot UNS M16631),E FOUR

### **Product Datasheet: Magnesium ZE63A-T6 (UNS M16630)** **High-Strength Rare Earth-Containing Magnesium Casting Alloy** --- #### **1. Overview** Magnesium ZE63A-T6 (UNS M16630) is a high-strength sand casting alloy that combines zinc and rare earth elements to achieve superior mechanical properties through T6 heat treatment. Conforming to ASTM B93 specifications, this alloy offers an excellent combination of tensile strength, yield strength, and corrosion resistance. The addition of rare earth elements enhances both castability and high-temperature performance, making ZE63A-T6 suitable for demanding aerospace and automotive applications where weight reduction and structural integrity are paramount. --- #### **2. Key Features & Advantages** - **High Strength-to-Weight Ratio:** Superior mechanical properties with magnesium's inherent lightness - **Excellent Castability:** Rare earth elements improve fluidity and reduce microporosity - **Good Corrosion Resistance:** Enhanced environmental performance compared to conventional alloys - **Heat Treatable:** T6 temper provides optimal strength characteristics - **Good Elevated Temperature Properties:** Maintains strength at moderate temperatures - **Excellent Machinability:** Can be precision machined to close tolerances --- #### **3. Chemical Composition (Weight %)** As specified in ASTM B93 for ingot (UNS M16631) and subsequent castings (UNS M16630): | Element | Mg (Balance) | Zn | Rare Earth (RE) | Zr | Other Elements (max) | |---------------|--------------|------------|-----------------|------------|---------------------| | **Content (%)** | - | 5.5-6.0 | 2.0-3.0 | 0.4-1.0 | 0.30 total | *Note: Rare earth elements typically include neodymium, praseodymium, and other light rare earths. Zinc provides solid solution strengthening, while rare earths contribute to precipitation hardening and improved casting characteristics.* --- #### **4. Typical Physical & Mechanical Properties (T6 Temper)** | Property | Value | Condition / Remarks | |---------------------------|------------------------------|---------------------| | **Density** | 1.87 g/cm³ (0.0675 lb/in³) | | | **Melting Range** | 530-630°C (986-1166°F) | | | **Thermal Conductivity** | 105 W/m·K | At 25°C | | **Specific Heat Capacity**| 1020 J/kg·K | At 25°C | | **Coefficient of Thermal Expansion** | 25.8 × 10⁻⁶/°C | 20-200°C | | **Ultimate Tensile Strength** | 275 MPa (40 ksi) | Room Temperature | | **Tensile Yield Strength**| 195 MPa (28 ksi) | 0.2% offset, RT | | **Elongation** | 5-10% | In 2 inches, RT | | **Compressive Yield Strength** | 195 MPa (28 ksi) | | | **Shear Strength** | 145 MPa (21 ksi) | | | **Fatigue Strength** | 110 MPa (16 ksi) | 10⁷ cycles, RT | | **Elastic Modulus** | 45 GPa (6.5×10⁶ psi) | | | **Hardness** | 75-85 HB | | | **Impact Toughness** | 6-8 J | Charpy, V-notch | --- #### **5. International Standards & Specifications** ZE63A-T6 conforms to the following international standards: - **ASTM B93:** Standard Specification for Magnesium Alloys in Ingot Form for Sand Castings, Permanent Mold Castings, and Die Castings - **UNS M16630:** Unified Numbering System for Cast Products - **UNS M16631:** Unified Numbering System for Ingot - **AMS 4482:** Aerospace Material Specification (when applicable) - **ISO 16220:** Magnesium and magnesium alloys - Castings --- #### **6. Applications** - **Aerospace Components:** - Gearbox housings and transmission cases - Engine accessory mounts and brackets - Helicopter transmission components - Structural airframe components - Missile and spacecraft parts - **High-Performance Automotive:** - Racing engine blocks and components - High-stress transmission cases - Suspension components - Wheel hubs and brake calipers - **Defense Applications:** - Weapon system components - Military vehicle parts - Radar and electronic housings - **Industrial Equipment:** - High-speed compressor components - Pump housings and impellers - Robotics and automation components - Specialized machinery parts --- #### **7. Heat Treatment & Processing** - **Solution Treatment:** 525°C ± 5°C (977°F ± 9°F) for 8-12 hours under protective atmosphere - **Quenching:** Hot water quenching at 70-90°C (158-194°F) - **Artificial Aging:** 200°C ± 5°C (392°F ± 9°F) for 16-24 hours - **Casting Methods:** - Sand casting (primary application) - Permanent mold casting - Investment casting for complex geometries - **Machining:** Excellent machinability with high surface quality - **Joining:** Good weldability using TIG methods with compatible filler materials - **Surface Treatment:** Responds well to anodizing and coating processes --- #### **8. Quality Assurance & Certification** - **Chemical Analysis:** Certified to ASTM B93 requirements - **Mechanical Testing:** Full certification to T6 temper properties - **Non-Destructive Testing:** Radiographic and dye penetrant inspection available - **Microstructural Control:** Grain size and intermetallic phase monitoring - **Traceability:** Full material and process traceability for aerospace applications --- **Disclaimer** This technical data is for informational purposes only. Properties may vary depending on casting method, section size, and specific heat treatment parameters. ZE63A-T6 is designed for applications requiring high strength and good corrosion resistance. Users should consult ASTM B93 specifications and conduct appropriate testing to verify suitability for specific applications. All processing must follow established safety procedures for magnesium alloys, particularly during machining and heat treatment operations.

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 3363 gallon liquid totes Special package is available on request.