Magnesium AZ63A-T7，ASTM B 80; SAE J465,E FOUR

Magnesium AZ63A-T7 Casting Alloy (ASTM B80; SAE J465)** **Product Description** Magnesium AZ63A-T7 is a solution heat-treated and stabilized magnesium casting alloy designed for applications requiring dimensional stability and improved corrosion resistance. The "T7" temper designation indicates the material has undergone solution heat treatment followed by over-aging/stabilization. This special temper treatment provides maximum dimensional stability while maintaining good mechanical properties, making it suitable for applications where minimal dimensional change over time is critical. --- #### **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 | | **Electrical Resistivity** | 140 nΩ·m | --- #### **3. Mechanical Properties (T7 Condition)** | Property | Typical Value | | :--- | :--- | | **Tensile Strength** | 250 MPa (36 ksi) | | **Yield Strength (0.2% Offset)** | 110 MPa (16 ksi) | | **Elongation** | 5% | | **Hardness** | 60 HB | | **Compressive Yield Strength** | 110 MPa (16 ksi) | | **Shear Strength** | 140 MPa (20 ksi) | | **Fatigue Strength** | 90 MPa (13 ksi) | --- #### **4. International Standards** | Standard | Title | | :--- | :--- | | **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:** Hot water or air cooling * **Stabilization Treatment:** 200-250°C (390-480°F) for 4-8 hours * **Cooling:** Air cool to room temperature --- #### **6. Product Applications** * **Aerospace Components** * Aircraft instrument housings * Guidance system components * Optical mounting platforms * Avionics enclosures * **Precision Equipment** * Measuring instrument frames * Precision machinery components * Dimensional stability-critical parts * Optical and laser system mounts * **Automotive Applications** * Transmission housings * Engine management system components * Precision bracket systems * **Industrial Applications** * Jigs and fixtures * Precision gauge bases * Metrology equipment components --- #### **7. Key Characteristics** * **Advantages:** * Excellent dimensional stability * Good corrosion resistance * Reduced residual stresses * Minimal aging dimensional changes * Good machinability * Improved stress corrosion resistance * **Limitations:** * Slightly lower strength than T6 temper * More complex heat treatment process * Higher cost compared to T5 and T6 tempers * Limited availability * **Special Considerations:** * Ideal for components requiring long-term dimensional stability * Suitable for applications with varying temperature conditions * Recommended for stress-critical applications * Good for components subject to minimal machining after heat treatment **Summary** Magnesium AZ63A-T7 is a specialized heat treatment variant designed for applications where dimensional stability is paramount. The stabilization treatment (T7 condition) ensures minimal dimensional changes over time and under varying environmental conditions. While offering slightly lower mechanical strength compared to the T6 temper, it provides superior dimensional stability and stress relief. Compliance with ASTM B80 and SAE J465 standards ensures material consistency for precision applications in aerospace, automotive, and industrial sectors where maintaining precise dimensions is critical for performance and reliability.

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 3303 gallon liquid totes Special package is available on request.