Elektron AZ91E Magnesium Casting Alloy，ASTM B80 AZ91E; BS2970 MAG7/3; DIN MgAl /19 Zn1; AFNOR G-A9Z1; BS2L125; ISO 16220 MC21120,E FOUR

Elektron AZ91E Magnesium Casting Alloy** **Product Overview** Elektron AZ91E is a widely used, high-purity die-casting magnesium alloy known for an excellent balance of strength, corrosion resistance, and castability. The "E" suffix denotes a version with stricter control over iron, copper, and nickel impurities, significantly enhancing its corrosion resistance compared to the standard AZ91 alloy. It is one of the most common and commercially important magnesium casting alloys, favored for producing thin-walled, complex, and high-integrity components. This alloy is typically supplied as die-castings, but it is also suitable for sand and permanent mold casting processes. --- #### **1. Chemical Composition** The composition of AZ91E is optimized for strength (via aluminum and zinc) and grain refinement (via manganese), with strict limits on harmful impurities. | Element | Composition (% by Weight) | | :--- | :--- | | **Aluminum (Al)** | 8.3 - 9.7 % | | **Zinc (Zn)** | 0.35 - 1.0 % | | **Manganese (Mn)** | 0.15 - 0.50 % | | **Silicon (Si)** | ≤ 0.20 % | | **Copper (Cu)** | ≤ 0.030 % | | **Iron (Fe)** | ≤ 0.005 % | | **Nickel (Ni)** | ≤ 0.002 % | | **Other Impurities** | ≤ 0.02 % (each) | | **Magnesium (Mg)** | Balance | *Key Note:* The very low limits for **Fe, Cu, and Ni** are critical. These elements form galvanic couples with the magnesium matrix, drastically reducing corrosion performance. The "E" (High Purity) grade ensures superior longevity in service. --- #### **2. Physical & Mechanical Properties** AZ91E offers a compelling property profile, characterized by low density, good stiffness, and adequate strength for a wide range of applications. **Physical Properties:** * **Density:** 1.81 g/cm³ (0.065 lb/in³) - ~35% lighter than aluminum and ~75% lighter than steel. * **Melting Point:** ~ 595 °C (1103 °F) * **Coefficient of Thermal Expansion:** 26 μm/m·°C (20-100°C) * **Thermal Conductivity:** ~ 51 W/m·K **Typical Mechanical Properties (As-Die Cast):** * **Ultimate Tensile Strength (UTS):** 230 - 240 MPa (33 - 35 ksi) * **Tensile Yield Strength (TYS):** 150 - 160 MPa (22 - 23 ksi) * **Compressive Yield Strength (CYS):** 150 - 160 MPa (22 - 23 ksi) * **Elongation at Break:** 3 - 7% * **Hardness:** 60 - 70 HBW * **Modulus of Elasticity:** 45 GPa (6.5 x 10³ ksi) *Note:* Properties can vary slightly depending on the casting process (e.g., die casting, sand casting) and the wall thickness of the component. --- #### **3. International Standards & Specifications** Elektron AZ91E is recognized and specified by a comprehensive set of international standards, ensuring global consistency and quality. * **ASTM International:** **ASTM B80 AZ91E** (Standard Specification for Magnesium-Alloy Sand Castings) * **British Standards (BS):** **BS 2970 MAG7/3** (Specification for Magnesium Alloy Ingots and Castings) * **German Standards (DIN):** **DIN MgAl9Zn1** (This is the general alloy designation; the "E" grade implies the high-purity version) * **French Standards (AFNOR):** **AFNOR G-A9Z1** * **Aerospace Standards (BS):** **BS 2L 125** (A historical UK aerospace material specification) * **International Organization for Standardization (ISO):** **ISO 16220 MC21120** (Magnesium and magnesium alloys — Castings) --- #### **4. Product Applications** The combination of light weight, good strength, excellent die-castability, and improved corrosion resistance makes AZ91E the first choice for a vast range of applications across multiple industries. * **Automotive Industry:** * **Engine & Transmission:** Valve covers, intake manifolds, clutch housings, transmission cases. * **Interior & Body:** Steering column brackets, seat frames, pedal brackets, instrument panel structures. * **Body-in-White:** Inner door constructs. * **Consumer Electronics:** * Laptop and notebook computer housings. * Casings for projectors, cameras, and power tools. * Frames for handheld devices. * **Aerospace:** * Non-critical aircraft components, housings for electronic equipment, and interior parts. * **General Industrial:** * Components for textile machinery, packaging equipment, and any application where moving mass reduction leads to higher speed and energy efficiency. --- **Summary** **Elektron AZ91E** is the workhorse of magnesium casting alloys. Its well-balanced composition, dominated by aluminum and zinc for strength, and its high-purity "E" grade for corrosion resistance, make it a versatile and reliable material. Its extensive listing in major international standards like **ASTM B80** and **ISO 16220** underscores its global acceptance and proven performance in high-volume, lightweight structural applications, particularly in the automotive and consumer electronics 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 3389 gallon liquid totes Special package is available on request.