Magnesium AZ92A-T6，UNS M11920;,E FOUR

Technical Datasheet: Magnesium Alloy AZ92A-T6, UNS M11920** --- #### **1. Material Overview** AZ92A-T6 is a high-strength magnesium-aluminum-zinc casting alloy supplied in the solution heat-treated and artificially aged condition. The T6 temper provides maximum mechanical strength and hardness, making it suitable for structural applications requiring elevated strength-to-weight ratios. This alloy offers improved strength characteristics compared to the AZ91 series while maintaining good castability. --- #### **2. Key Features** - **High strength-to-weight ratio** - **Good castability** for sand and permanent mold casting - **Excellent machinability** - **Good wear resistance** - **Reasonable corrosion resistance** with proper protection - **Good stiffness and dimensional stability** --- #### **3. Chemical Composition (Weight %)** | Element | Composition (%) | |---------|-----------------| | **Aluminum (Al)** | 8.3–9.7% | | **Zinc (Zn)** | 1.6–2.4% | | **Manganese (Mn)** | 0.10–0.35% | | **Silicon (Si)** | ≤ 0.20% | | **Copper (Cu)** | ≤ 0.25% | | **Iron (Fe)** | ≤ 0.05% | | **Nickel (Ni)** | ≤ 0.03% | | **Other Elements** | ≤ 0.30% | | **Magnesium (Mg)** | Balance | --- #### **4. Mechanical Properties (Typical, T6 Temper)** | Property | Value (Metric) | Value (Imperial) | |----------|----------------|------------------| | **Ultimate Tensile Strength** | 250–280 MPa | 36–41 ksi | | **Tensile Yield Strength (0.2%)** | 150–180 MPa | 22–26 ksi | | **Compressive Yield Strength** | 150–180 MPa | 22–26 ksi | | **Elongation (% in 50mm)** | 2–4% | 2–4% | | **Hardness (Brinell)** | 70–85 HB | 70–85 HB | | **Shear Strength** | 130–150 MPa | 19–22 ksi | | **Fatigue Strength** | 80–100 MPa | 12–15 ksi | | **Modulus of Elasticity** | 45 GPa | 6.5×10⁶ psi | | **Poisson's Ratio** | 0.35 | 0.35 | --- #### **5. Physical Properties** | Property | Value | |----------|-------| | **Density** | 1.82 g/cm³ | | **Melting Range** | 450–595°C | | **Specific Heat** | 1.00 kJ/kg·K | | **Thermal Conductivity** | 65 W/m·K | | **Coefficient of Thermal Expansion** | 26.5 μm/m·K | | **Solidification Shrinkage** | 0.6–0.8% | --- #### **6. Heat Treatment Cycle (T6)** - **Solution Treatment:** 415°C ± 10°C for 16–24 hours - **Quenching:** Hot water (60–100°C) - **Artificial Aging:** 215°C ± 5°C for 4–16 hours - **Cooling:** Air cool --- #### **7. Applicable Standards** - **ASTM B80** – Standard Specification for Magnesium-Alloy Sand Castings - **ASTM B199** – Standard Specification for Magnesium-Alloy Permanent Mold Castings - **SAE AMS 4432** – Magnesium Alloy Castings, Sand 9Al-2Zn (AZ92A) - **UNS M11920** - **ISO 16220** – Magnesium and magnesium alloys --- #### **8. Manufacturing Characteristics** - **Casting Methods:** Sand casting, permanent mold casting - **Pouring Temperature:** 680–730°C - **Fluidity:** Good - **Hot Tearing Resistance:** Fair to good - **Machinability:** Excellent - **Weldability:** Fair (requires specialized techniques) --- #### **9. Applications** - **Aerospace:** Gearbox housings, transmission cases, structural brackets - **Automotive:** High-performance engine components, racing transmission cases - **Industrial:** High-speed rotating components, machinery bases, support frames - **Defense:** Weapon system components, radar bases, military equipment housings --- #### **10. Corrosion Performance & Protection** - **Atmospheric Corrosion:** Good with proper surface protection - **Salt Spray Resistance:** Moderate (requires protective coatings) - **Recommended Coatings:** Chemical conversion coatings, anodizing, paint, powder coating - **Galvanic Corrosion:** Requires isolation from dissimilar metals --- #### **11. Design Guidelines** - **Maximum Service Temperature:** 120°C continuous - **Section Thickness:** Recommended 3–25 mm - **Stress Relief:** T6 treatment provides good dimensional stability - **Joint Design:** Avoid sharp corners and thick-thin transitions --- #### **12. Comparison with Similar Alloys** - **vs. AZ91-T6:** Higher strength due to increased zinc content - **vs. AM100A:** Better castability and corrosion resistance - **vs. ZK51A:** Better castability but lower strength --- **Note:** This datasheet provides typical values and characteristics. Actual properties may vary depending on casting parameters, section size, and heat treatment details. For critical applications, always consult certified test reports and conduct application-specific testing. AZ92A-T6 provides an excellent balance of strength and castability for demanding structural applications where weight reduction is critical.

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 3321 gallon liquid totes Special package is available on request.