Elektron AZ91D Magnesium Alloy,E FOUR

### **Elektron AZ91D Magnesium Alloy** **Product Overview** Elektron AZ91D is a high-purity die casting magnesium alloy that represents the corrosion-resistant version of the standard AZ91 composition. As the most widely used magnesium die casting alloy globally, AZ91D offers an exceptional balance of castability, mechanical properties, and corrosion resistance. The "D" suffix denotes the high-purity variant with严格控制 iron, copper, and nickel content, resulting in significantly improved corrosion performance compared to standard AZ91 alloys while maintaining excellent mechanical properties and manufacturing characteristics. This alloy is primarily supplied as high-pressure die castings, making it ideal for high-volume production of thin-walled, complex components across automotive, electronics, and consumer goods industries. --- #### **1. Chemical Composition** AZ91D features strict control over impurity elements to maximize corrosion resistance. | Element | Composition (% by Weight) | | :---------------- | :-------------------------------- | | **Aluminum (Al)** | 8.5 - 9.5 % | | **Zinc (Zn)** | 0.45 - 0.9 % | | **Manganese (Mn)** | 0.17 - 0.40 % | | **Silicon (Si)** | ≤ 0.08 % | | **Copper (Cu)** | ≤ 0.025 % | | **Iron (Fe)** | ≤ 0.004 % | | **Nickel (Ni)** | ≤ 0.001 % | | **Other Impurities** | ≤ 0.01 % (each) | | **Magnesium (Mg)** | Balance | *Note:* The critically low levels of **iron (<0.004%), copper (<0.025%), and nickel (<0.001%)** are essential for achieving the alloy's superior corrosion resistance. The **aluminum** content provides excellent castability and strength through the formation of Mg₁₇Al₁₂ precipitates, while **manganese** helps neutralize residual iron impurities. --- #### **2. Physical & Mechanical Properties** AZ91D offers a well-balanced combination of physical and mechanical properties optimized for die casting applications. **Physical Properties:** * **Density:** 1.81 g/cm³ (0.065 lb/in³) * **Melting Range:** 470 - 595 °C (878 - 1103 °F) * **Coefficient of Thermal Expansion:** 26.0 μm/m·°C (20-200°C) * **Thermal Conductivity:** 51 W/m·K * **Specific Heat Capacity:** 1050 J/kg·K **Typical Mechanical Properties (As-Die Cast):** * **Ultimate Tensile Strength (UTS):** 230 - 250 MPa (33 - 36 ksi) * **Tensile Yield Strength (TYS):** 150 - 170 MPa (22 - 25 ksi) * **Elongation:** 3 - 7% * **Compressive Yield Strength:** 150 - 170 MPa (22 - 25 ksi) * **Shear Strength:** 130 - 140 MPa (19 - 20 ksi) * **Hardness:** 65 - 75 HBW * **Modulus of Elasticity:** 45 GPa (6.5 × 10³ ksi) **Corrosion Performance:** * **Salt Spray Resistance:** > 96 hours to first red rust (ASTM B117) * **Galvanic Corrosion Resistance:** Good when properly isolated and coated * **Stress Corrosion Cracking:** Good resistance in most environments --- #### **3. International Standards & Specifications** AZ91D is recognized by all major international standards organizations for magnesium die castings. * **ASTM International:** **ASTM B94** (Standard Specification for Magnesium-Alloy Die Castings) * **ISO Standards:** **ISO 16220** (Magnesium and magnesium alloys - Castings) * **SAE International:** **SAE J465** * **UNS Designation:** **UNS M11917** * **German Standards:** **DIN EN 1753 Mg-Al9Zn1** * **Japanese Standards:** **JIS H 5303** * **Chinese Standards:** **GB/T 19078** * **Proprietary Designation:** **Elektron AZ91D** (Luxfer MEL Technologies) --- #### **4. Product Applications** AZ91D finds extensive use across multiple industries due to its excellent combination of properties. * **Automotive Industry:** * **Transmission Housings and Components** * **Intake Manifolds and Throttle Bodies** * **Steering Wheel Cores and Columns** * **Seat Frames and Adjusters** * **Bracket and Mounting Systems** * **Electronics & Consumer Goods:** * **Laptop Computer Housings and Chassis** * **Digital Camera Bodies and Frames** * **Power Tool Housings and Components** * **Portable Electronic Device Enclosures** * **Aerospace & Defense:** * **Aircraft Instrument Housings** * **Avionics Equipment Casings** * **Military Communication Equipment** * **Industrial Applications:** * **Power Tool Components** * **Material Handling Equipment Parts** * **Textile Machinery Components** * **Office Automation Equipment Housings** --- #### **5. Manufacturing Characteristics** **Die Casting Performance:** * Excellent fluidity for thin-walled castings (down to 1.0 mm) * Good hot tearing resistance * Low solidification shrinkage * Excellent dimensional stability * Fast cycling times in high-pressure die casting **Secondary Processing:** * Excellent machinability with high surface quality * Good response to various surface treatments * Compatibility with conversion coatings and painting systems * Good weldability using TIG and MIG processes * Suitable for various finishing operations --- **Summary** **Elektron AZ91D Magnesium Alloy** represents the gold standard for magnesium die casting alloys, offering an optimal balance of **mechanical properties**, **exceptional castability**, and **superior corrosion resistance**. The high-purity chemistry, characterized by **ultra-low iron, copper, and nickel content**, sets AZ91D apart from standard magnesium alloys and enables its use in demanding applications where corrosion performance is critical. Compliance with major international standards including **ASTM B94**, **ISO 16220**, and various automotive specifications ensures consistent quality and reliability. As the most specified magnesium die casting alloy worldwide, AZ91D continues to drive the adoption of magnesium components across industries, providing engineers with a proven, reliable material solution for weight reduction and performance enhancement in high-volume production 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 3406 gallon liquid totes Special package is available on request.