Magnesium AZ92A-T7, Cast,E FOUR

### **Product Datasheet: Magnesium Alloy AZ92A-T7 (Cast), UNS M11920** --- #### **1. Overview** Magnesium Alloy AZ92A-T7 is a high-strength magnesium-aluminum-zinc casting alloy supplied in the overaged/stabilized temper. The **"T7"** temper designation indicates that castings have undergone **solution heat treatment followed by overaging** at elevated temperatures. This thermal treatment provides optimal dimensional stability and relief of residual stresses while maintaining good mechanical properties. --- #### **2. Key Advantages** - **Superior Dimensional Stability:** Ideal for applications requiring precise dimensions - **Excellent Stress Relief:** Complete elimination of residual casting stresses - **Good Thermal Stability:** Suitable for elevated temperature applications - **Maintained Ductility:** Good combination of strength and elongation - **Reduced Aging Effects:** Stable properties over long-term service --- #### **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 | | **Copper (Cu)** | ≤ 0.25 | **Iron (Fe)** | ≤ 0.05 | | **Nickel (Ni)** | ≤ 0.03 | **Other Impurities** | ≤ 0.30 | | **Magnesium (Mg)** | Balance | | | *Note: The aluminum and zinc content provides solid solution strengthening while the T7 treatment optimizes microstructural stability.* --- #### **4. Physical & Mechanical Properties (Typical for Sand Cast T7 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** | 230 - 260 MPa | 33 - 38 ksi | | **Tensile Yield Strength (0.2%)** | 130 - 150 MPa | 19 - 22 ksi | | **Elongation (in 50mm)** | 3 - 6 % | 3 - 6 % | | **Compressive Yield Strength** | 130 - 150 MPa | 19 - 22 ksi | | **Hardness (Brinell)** | 65 - 75 HB | 65 - 75 HB | | **Modulus of Elasticity** | 45 GPa | 6.5 × 10⁶ psi | | **Shear Strength** | 130 - 150 MPa | 19 - 22 ksi | | **Fatigue Strength** | 90 - 110 MPa | 13 - 16 ksi | | **Creep Resistance** | Good at temperatures up to 150°C | Good at temperatures up to 300°F | --- #### **5. Heat Treatment Parameters** - **Solution Treatment:** 415°C ± 10°C (780°F ± 20°F) for 16-24 hours - **Quenching:** Hot water or forced air - **Overaging Temperature:** 230-260°C (445-500°F) for 8-16 hours - **Cooling:** Furnace cool or air cool - **Microstructure:** Coarsened, stable precipitate structure --- #### **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 - **Aerospace Standards:** - **BAC 5731:** Boeing Material Specification --- #### **7. Product Applications** AZ92A-T7 is specified for applications requiring maximum dimensional stability: - **Aerospace Components:** - Aircraft gearbox housings - Engine accessory mounts - Avionics mounting structures - Guidance system housings - **Precision Instruments:** - Optical mounting platforms - Measuring instrument frames - Coordinate measuring machine components - Metrology equipment bases - **Automotive Applications:** - High-precision transmission cases - Engine management system housings - Turbocharger components - **Industrial Equipment:** - Machine tool components - Precision jigs and fixtures - Robotic arm structures - Semiconductor manufacturing equipment --- #### **8. Technical Considerations** - **Dimensional Stability:** Excellent for precision applications - **Thermal Exposure:** Stable up to 150°C (300°F) continuous service - **Corrosion Protection:** Requires standard magnesium protection systems - **Machinability:** Excellent - stable microstructure ensures consistent machining - **Joining:** Best joined by mechanical fastening or adhesive bonding --- #### **9. Comparison with Other Tempers** - **vs. T6:** Lower strength but superior dimensional stability - **vs. T5:** Better ductility and thermal stability - **vs. F (As-Cast):** 50-60% higher strength with excellent stability - **vs. AZ91E-T7:** Higher strength due to increased zinc content --- #### **10. Quality Assurance** - **Dimensional Inspection:** Critical for T7 certified components - **Stress Relief Verification:** Can be verified by stress analysis - **Non-Destructive Testing:** Recommended for critical applications - **Certification:** Full heat treatment documentation available --- **Disclaimer:** This information is for reference purposes only. Properties may vary based on casting method, section size, and specific T7 treatment parameters. AZ92A-T7 is particularly recommended for applications where dimensional stability is critical. Always consult certified test data and applicable material specifications for aerospace and defense 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 3325 gallon liquid totes Special package is available on request.