Magnesium AZ91E-T6, Cast,E FOUR

Product Datasheet: Magnesium Alloy AZ91E-T6 (Cast), UNS M11914** **1. Overview** Magnesium Alloy AZ91E-T6 is a high-purity, heat-treated magnesium-aluminum-zinc casting alloy that represents the premium grade in the AZ91 series. The **"T6"** temper designation indicates the alloy has undergone a complete thermal treatment process consisting of **Solution Heat Treatment followed by Artificial Aging**. This process maximizes the alloy's mechanical properties while maintaining the exceptional corrosion resistance characteristic of the high-purity "E" composition. AZ91E-T6 offers the optimal combination of high strength, good ductility, and superior corrosion resistance among standard magnesium casting alloys, making it suitable for the most demanding structural applications. **2. Key Advantages** * **Optimum Mechanical Properties:** Achieves the highest strength and hardness available in the AZ91 series * **Superior Corrosion Resistance:** Excellent resistance to saltwater and atmospheric corrosion due to ultra-low impurity limits * **Excellent Strength-to-Weight Ratio:** Provides the highest specific strength among standard magnesium casting alloys * **Good Dimensional Stability:** Artificial aging ensures stable mechanical properties and dimensions * **Enhanced Fatigue Performance:** Improved resistance to cyclic loading compared to other tempers **3. Chemical Composition (Weight % per ASTM B80)** | Element | Content (%) | Element | Content (%) | | :--- | :--- | :--- | :--- | | **Aluminum (Al)** | 8.3 - 9.2 | **Zinc (Zn)** | 0.45 - 0.9 | | **Manganese (Mn)** | 0.17 - 0.50 | **Silicon (Si)** | ≤ 0.20 | | **Copper (Cu)** | ≤ 0.015 | **Iron (Fe)** | ≤ 0.004 | | **Nickel (Ni)** | ≤ 0.001 | **Other Impurities** | ≤ 0.30 | | **Magnesium (Mg)** | Balance | | | *Note: The critical control of iron (Fe ≤ 0.004%), copper (Cu ≤ 0.015%), and nickel (Ni ≤ 0.001%) is essential for achieving corrosion resistance an order of magnitude better than standard AZ91 alloys.* **4. Physical & Mechanical Properties (Typical for Sand Cast T6 Temper)** | Property | Metric Unit | Imperial Unit | | :--- | :--- | :--- | | **Density** | 1.81 g/cm³ | 0.065 lb/in³ | | **Melting Range** | 470 - 595 °C | 878 - 1103 °F | | **Ultimate Tensile Strength** | 275 - 310 MPa | 40 - 45 ksi | | **Tensile Yield Strength (0.2%)** | 150 - 165 MPa | 22 - 24 ksi | | **Elongation (in 50mm)** | 3 - 6 % | 3 - 6 % | | **Compressive Yield Strength** | 150 - 165 MPa | 22 - 24 ksi | | **Hardness (Brinell)** | 70 - 80 HB | 70 - 80 HB | | **Modulus of Elasticity** | 45 GPa | 6.5 × 10⁶ psi | | **Shear Strength** | 140 - 165 MPa | 20 - 24 ksi | | **Fatigue Strength** | 100 - 120 MPa | 14.5 - 17.4 ksi | **5. Heat Treatment Cycle** * **Solution Treatment:** 415°C ± 5°C (780°F ± 10°F) for 16-24 hours, followed by rapid quenching in hot water (60-100°C) * **Artificial Aging:** 215°C ± 5°C (420°F ± 10°F) for 4-16 hours, followed by air cooling * **Microstructure:** Features fine, dispersed Mg₁₇Al₁₂ precipitates within a supersaturated solid solution matrix **6. International Standards** * **ASTM International:** * **ASTM B80:** Standard Specification for Magnesium-Alloy Sand Castings * **ASTM B93/B93M:** Standard Specification for Magnesium Alloys in Ingot Form * **SAE International:** * **SAE AMS 4435:** Magnesium Alloy Sand Castings 9Al-0.7Zn (AZ91) * **Unified Numbering System (UNS):** * **UNS M11914** * **ISO Standards:** * **ISO 16220:** Magnesium and magnesium alloys - Cast products * **Military Standards:** * **MIL-M-46062:** Magnesium Alloy, Castings, High Strength **7. Product Applications** AZ91E-T6 is specified for high-performance applications requiring maximum strength and corrosion resistance: * **Aerospace & Defense:** * Aircraft transmission housings and gearboxes * Helicopter rotor components * Missile and radar system housings * Military communication equipment enclosures * **Automotive Racing:** * High-performance engine components * Transmission cases for racing applications * Suspension components for lightweight vehicles * **Industrial Equipment:** * High-speed robotic components * Aerospace ground support equipment * Precision instrument housings **8. Technical Considerations** * **Corrosion Performance:** Salt spray resistance typically exceeds 300 hours to initial red rust * **Maximum Service Temperature:** 120°C (250°F) for prolonged exposure * **Machinability:** Excellent - can be machined at high speeds with good surface finish * **Joining Methods:** Best joined by adhesive bonding or mechanical fastening * **Surface Protection:** Still benefits from conversion coatings and painting in severe environments **9. Comparison with Other Tempers** * **vs. F (As-Cast):** 80-100% higher yield strength, 200-300% better elongation * **vs. T4 (Solution Treated):** 25-35% higher yield strength, better hardness and fatigue strength * **vs. AZ91C-T6:** Superior corrosion resistance with comparable mechanical properties --- **Disclaimer:** This information is for reference purposes only. Properties may vary based on casting method, section size, and specific heat treatment parameters. For critical aerospace applications, additional testing and certification may be required. Always consult certified test data and applicable material specifications for design purposes.

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 3316 gallon liquid totes Special package is available on request.