Magnesium AZ63A-T4, AMS 4422; ASTM B 80; SAE J465,E FOUR

Magnesium AZ63A-T4 Casting Alloy (AMS 4422; ASTM B80; SAE J465)** **Product Description** Magnesium AZ63A-T4 is a solution heat-treated sand casting alloy that offers improved ductility and toughness compared to the as-cast condition. The "T4" temper designation indicates the material has undergone solution heat treatment followed by natural aging. This alloy meets the requirements of AMS 4422, ASTM B80, and SAE J465 standards, making it suitable for applications requiring enhanced mechanical properties. --- #### **1. Chemical Composition (Weight %)** | Element | Minimum (%) | Maximum (%) | | :--- | :--- | :--- | | **Aluminum (Al)** | 5.3 | 6.7 | | **Zinc (Zn)** | 2.5 | 3.5 | | **Manganese (Mn)** | 0.15 | 0.50 | | **Silicon (Si)** | - | 0.30 | | **Copper (Cu)** | - | 0.25 | | **Iron (Fe)** | - | 0.005 | | **Nickel (Ni)** | - | 0.010 | | **Other Elements** | - | 0.30 (total) | | **Magnesium (Mg)** | **Balance** | --- #### **2. Physical Properties** | Property | Value | | :--- | :--- | | **Density** | 1.83 g/cm³ (0.066 lb/in³) | | **Melting Range** | 455 - 610°C (851 - 1130°F) | | **Thermal Conductivity** | 65 W/m·K | | **Coefficient of Thermal Expansion** | 26.0 μm/m·°C (20-100°C) | | **Modulus of Elasticity** | 45 GPa (6.5 × 10⁶ psi) | | **Specific Heat Capacity** | 1050 J/kg·K | --- #### **3. Mechanical Properties (T4 Condition)** | Property | Typical Value | | :--- | :--- | | **Tensile Strength** | 180 MPa (26 ksi) | | **Yield Strength (0.2% Offset)** | 85 MPa (12 ksi) | | **Elongation** | 8% | | **Hardness** | 55 HB | | **Compressive Yield Strength** | 85 MPa (12 ksi) | | **Shear Strength** | 125 MPa (18 ksi) | --- #### **4. International Standards** | Standard | Title | | :--- | :--- | | **AMS 4422** | Magnesium Alloy Castings, Sand 6.5Al-3Zn-0.2Mn (AZ63A-T4) | | **ASTM B80** | Standard Specification for Magnesium-Alloy Sand Castings | | **SAE J465** | Magnesium Alloys (Cast and Wrought) | --- #### **5. Heat Treatment Specification** * **Solution Treatment:** 385-425°C (725-795°F) for 4-6 hours * **Quenching Medium:** Air or hot water * **Aging:** Natural aging at room temperature * **Stabilization:** Optional stabilization at 125-150°C if required --- #### **6. Product Applications** * **Aerospace Components** * Aircraft wheel components * Gearbox housings * Engine accessory mounts * Structural brackets * **Automotive Parts** * Transmission cases * Engine components * Suspension parts * **Industrial Equipment** * Pump housings * Compressor parts * Machinery components requiring impact resistance --- #### **7. Key Characteristics** * **Advantages:** * Improved ductility and impact resistance * Good stress corrosion resistance * Enhanced dimensional stability * Better toughness than F temper * Good machinability * **Limitations:** * Lower strength compared to T6 temper * Requires proper quenching to minimize distortion * Not suitable for high-temperature applications * May require stress relief after machining * **Manufacturing Notes:** * Suitable for sand casting processes * Solution treatment improves corrosion resistance * Good response to subsequent aging treatments * Proper quenching is critical to prevent cracking **Summary** Magnesium AZ63A-T4 provides an optimal balance of ductility and moderate strength for applications requiring good impact resistance and toughness. The solution heat treatment (T4 condition) significantly improves the alloy's mechanical properties compared to the as-cast condition, while maintaining the inherent advantages of magnesium alloys. Compliance with AMS 4422, ASTM B80, and SAE J465 standards ensures material consistency and reliability for aerospace, automotive, and industrial 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 3301 gallon liquid totes Special package is available on request.