Magnesium AZ91E-T4, Cast,E FOUR

Product Datasheet: Magnesium Alloy AZ91E-T4 (Cast), UNS M11914** **1. Overview** Magnesium Alloy AZ91E-T4 is a high-purity, corrosion-resistant magnesium-aluminum-zinc 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 involves heating components to dissolve alloying elements into the magnesium matrix, then quenching to retain a supersaturated solid solution. This thermal treatment significantly enhances the alloy's ductility and impact toughness while maintaining the superior corrosion resistance characteristic of the high-purity "E" composition. AZ91E-T4 represents an optimal balance between mechanical properties and environmental resistance for critical cast components. **2. Key Advantages** * **Enhanced Ductility:** Significant improvement in elongation and impact resistance compared to as-cast condition * **Superior Corrosion Resistance:** Excellent resistance to atmospheric and saltwater corrosion due to low impurity content * **Good Strength-to-Weight Ratio:** Maintains high specific strength with approximately 35% weight savings versus aluminum * **Stress Relief:** Solution treatment effectively eliminates residual casting stresses * **Improved Toughness:** Better resistance to shock and impact loading **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 | | | *Critical Note: The extremely low limits for iron (≤0.004%), copper (≤0.015%), and nickel (≤0.001%) are essential for achieving superior corrosion performance.* **4. Physical & Mechanical Properties (Typical for Sand Cast T4 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** | 240 - 275 MPa | 35 - 40 ksi | | **Tensile Yield Strength (0.2%)** | 110 - 140 MPa | 16 - 20 ksi | | **Elongation (in 50mm)** | 8 - 12 % | 8 - 12 % | | **Compressive Yield Strength** | 110 - 140 MPa | 16 - 20 ksi | | **Hardness (Brinell)** | 55 - 65 HB | 55 - 65 HB | | **Modulus of Elasticity** | 45 GPa | 6.5 × 10⁶ psi | | **Shear Strength** | 125 - 140 MPa | 18 - 20 ksi | | **Fatigue Strength** | 85 - 100 MPa | 12.3 - 14.5 ksi | **5. International Standards** * **ASTM International:** * **ASTM B80:** Standard Specification for Magnesium-Alloy Sand Castings * **ASTM B94:** Standard Specification for Magnesium-Alloy Die Castings * **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 * **Aerospace Standards:** * **BAC 5731:** Boeing Material Specification **6. Heat Treatment Parameters** * **Solution Treatment:** 410-425°C (770-795°F) for 8-24 hours * **Quenching Medium:** Hot water (60-100°C) or forced air * **Natural Aging:** Room temperature for several weeks to stabilize properties **7. Product Applications** AZ91E-T4 is specified for critical applications requiring both good mechanical properties and corrosion resistance: * **Aerospace Components:** * Transmission housings and gearbox cases * * * **8. Technical Considerations** * **Microstructure:** Homogeneous solid solution with minimal precipitation * **Corrosion Performance:** Salt spray resistance typically exceeds 200 hours to initial corrosion * **Aging Characteristics:** Naturally ages at room temperature following solution treatment * **Dimensional Stability:** Good dimensional stability after stress relief * **Post-Weld Heat Treatment:** Can be re-solution treated after repair welding **9. Comparison with Other Tempers** * **vs. F (As-Cast):** 60-80% improvement in elongation, 15-20% higher tensile strength * **vs. T6 (Aged):** Higher ductility and impact strength but lower yield strength and hardness * **vs. AZ91C-T4:** 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 heat treatment parameters. For applications requiring maximum strength, consider AZ91E-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 3315 gallon liquid totes Special package is available on request.