Magnesium AZ92A-T4, Cast,E FOUR

### **Product Datasheet: Magnesium Alloy AZ92A-T4 (Cast), UNS M11920** --- #### **1. Overview** Magnesium Alloy AZ92A-T4 is a high-strength magnesium-aluminum-zinc casting alloy supplied in the solution heat-treated condition. The **"T4"** temper designation indicates that castings have undergone **solution heat treatment followed by natural aging**, which significantly improves ductility and toughness compared to the as-cast condition while maintaining good strength characteristics. --- #### **2. Key Advantages** - **Enhanced Ductility:** Significant improvement in elongation and impact resistance - **Good Strength-to-Weight Ratio:** Maintains high specific strength - **Stress Relief:** Solution treatment eliminates residual casting stresses - **Improved Toughness:** Better resistance to shock and impact loading - **Good Machinability:** Excellent machining characteristics --- #### **3. Chemical Composition (Weight % per ASTM B80)** | Element | Content (%) | Element | Content (%) | |---------|-------------|---------|-------------| | **Aluminum (Al)** | 8.3 - 9.7 | **Zinc (Zn)** | 1.6 - 2.4 | | **Manganese (Mn)** | 0.10 - 0.35 | **Silicon (Si)** | ≤ 0.30 | | **Cu (Cu)** | ≤ 0.25 | **Iron (Fe)** | ≤ 0.05 | | **Nickel (Ni)** | ≤ 0.03 | **Other Impurities** | ≤ 0.30 | | **Magnesium (Mg)** | Balance | | | *Note: The higher zinc content (1.6-2.4%) compared to AZ91 alloys contributes to improved strength potential after heat treatment.* --- #### **4. Physical & Mechanical Properties (Typical for Sand Cast T4 Temper)** | Property | Metric Unit | Imperial Unit | |----------|-------------|--------------| | **Density** | 1.82 g/cm³ | 0.066 lb/in³ | | **Melting Range** | 450 - 595 °C | 842 - 1103 °F | | **Ultimate Tensile Strength** | 220 - 250 MPa | 32 - 36 ksi | | **Tensile Yield Strength (0.2%)** | 110 - 130 MPa | 16 - 19 ksi | | **Elongation (in 50mm)** | 5 - 8 % | 5 - 8 % | | **Compressive Yield Strength** | 110 - 130 MPa | 16 - 19 ksi | | **Hardness (Brinell)** | 60 - 70 HB | 60 - 70 HB | | **Modulus of Elasticity** | 45 GPa | 6.5 × 10⁶ psi | | **Shear Strength** | 125 - 140 MPa | 18 - 20 ksi | | **Fatigue Strength** | 85 - 100 MPa | 12 - 15 ksi | --- #### **5. Heat Treatment Parameters** - **Solution Treatment:** 415°C ± 10°C (780°F ± 20°F) for 16-24 hours - **Quenching Medium:** Hot water (60-100°C) or forced air - **Natural Aging:** Room temperature for several weeks to stabilize properties - **Microstructure:** Homogeneous solid solution with minimal precipitation --- #### **6. International Standards** - **ASTM International:** - **ASTM B80:** Standard Specification for Magnesium-Alloy Sand Castings - **ASTM B199:** Standard Specification for Magnesium-Alloy Permanent Mold Castings - **SAE International:** - **SAE AMS 4432:** Magnesium Alloy Castings, Sand 9Al-2Zn (AZ92A) - **Unified Numbering System (UNS):** - **UNS M11920** - **ISO Standards:** - **ISO 16220:** Magnesium and magnesium alloys - Cast products --- #### **7. Product Applications** AZ92A-T4 is used in applications requiring improved ductility and impact resistance: - **Aerospace Components:** - Structural brackets and supports - Gearbox components - Engine mounting brackets - Accessory housings - **Automotive Applications:** - High-performance engine components - Transmission cases - Suspension components - **Industrial Equipment:** - Machinery components subject to vibration - High-strength housing applications - Material handling equipment - **Defense Applications:** - Military vehicle components - Weapon system parts --- #### **8. Technical Considerations** - **Corrosion Performance:** Requires protective coatings for harsh environments - **Further Heat Treatment:** Can be artificially aged to T6 condition for higher strength - **Machinability:** Excellent - better chip formation compared to as-cast condition - **Dimensional Stability:** Good dimensional stability after stress relief - **Welding:** Can be welded using TIG or MIG processes with proper precautions --- #### **9. Comparison with Other Tempers** - **vs. F (As-Cast):** 100-150% improvement in elongation, 30-40% higher tensile strength - **vs. T6 (Aged):** Higher ductility and impact strength but lower yield strength - **vs. AZ91A-T4:** Higher strength potential due to increased zinc content --- #### **10. Quality Assurance** - **Non-Destructive Testing:** Suitable for radiographic and penetrant inspection - **Mechanical Testing:** Tensile testing per ASTM E8 - **Certification:** Available with full heat treatment documentation --- **Disclaimer:** This information is for reference purposes only. Properties may vary based on casting method, section size, and specific heat treatment parameters. For applications requiring maximum strength, consider specifying AZ92A-T6 temper. Always consult certified test data and applicable material specifications for critical applications, particularly in aerospace and defense sectors.

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 3323 gallon liquid totes Special package is available on request.