Melmag AT61 Magnesium Alloy,E FOUR

### **Melmag AT61 Magnesium Alloy** **Product Overview** Melmag AT61 is a high-performance magnesium-aluminum-tin alloy specifically engineered to provide an optimal balance of strength, ductility, and corrosion resistance. As part of the advanced Mg-Al-Sn system, AT61 offers enhanced mechanical properties and improved high-temperature performance compared to conventional magnesium-aluminum alloys. This alloy is particularly suitable for automotive, aerospace, and consumer electronics applications where reliability, lightweight characteristics, and manufacturing efficiency are critical requirements. The alloy is suitable for both die casting and permanent mold casting processes, offering excellent castability and consistent performance in high-volume production environments. --- #### **1. Chemical Composition** AT61 features a unique aluminum-tin composition system with controlled alloying elements. | Element | Composition (% by Weight) | | :---------------- | :-------------------------------- | | **Aluminum (Al)** | 5.5 - 6.5 % | | **Tin (Sn)** | 0.5 - 1.5 % | | **Manganese (Mn)** | 0.20 - 0.50 % | | **Zinc (Zn)** | ≤ 0.10 % | | **Silicon (Si)** | ≤ 0.08 % | | **Copper (Cu)** | ≤ 0.008 % | | **Iron (Fe)** | ≤ 0.004 % | | **Nickel (Ni)** | ≤ 0.001 % | | **Other Impurities** | ≤ 0.01 % (each) | | **Magnesium (Mg)** | Balance | *Note:* The addition of **Tin (Sn)** enhances the alloy's strength and refines its microstructure, while **Aluminum** provides solid solution strengthening and improves castability. The strict control of **iron**, **copper**, and **nickel** impurities ensures excellent corrosion resistance. --- #### **2. Physical & Mechanical Properties** AT61 exhibits a superior combination of mechanical properties with good ductility. **Physical Properties:** * **Density:** 1.80 g/cm³ (0.065 lb/in³) * **Melting Range:** 545 - 620 °C (1013 - 1148 °F) * **Coefficient of Thermal Expansion:** 26.3 μm/m·°C (20-200°C) * **Thermal Conductivity:** 72 W/m·K * **Specific Heat Capacity:** 1030 J/kg·K **Typical Mechanical Properties (As-Die Cast):** * **Ultimate Tensile Strength (UTS):** 230 - 250 MPa (33 - 36 ksi) * **Tensile Yield Strength (TYS):** 140 - 160 MPa (20 - 23 ksi) * **Elongation:** 8 - 12% * **Compressive Yield Strength:** 140 - 160 MPa (20 - 23 ksi) * **Shear Strength:** 140 - 160 MPa (20 - 23 ksi) * **Fatigue Strength:** 115 - 135 MPa (17 - 20 ksi) * **Hardness:** 65 - 75 HBW * **Modulus of Elasticity:** 45 GPa (6.5 × 10³ ksi) **Elevated Temperature Performance:** * **Good strength retention up to 150°C (302°F)** * **Improved creep resistance compared to standard AZ alloys** * **Stable microstructure at elevated temperatures** * **Suitable for under-hood automotive applications** --- #### **3. International Standards & Specifications** AT61 complies with major international standards for magnesium alloys. * **ASTM International:** **ASTM B94** (Standard Specification for Magnesium-Alloy Die Castings) * **ISO Standards:** **ISO 16220** (Magnesium and magnesium alloys - Castings) * **SAE International:** **SAE J465** * **JIS Standards:** **JIS H 5303** * **GB Standards:** **GB/T 19078** * **Proprietary Designation:** **Melmag AT61** --- #### **4. Product Applications** AT61 is widely used in applications requiring enhanced mechanical properties and good elevated temperature performance. * **Automotive Industry:** * **Transmission Housings and Components** * **Engine Bracket Systems** * **Intake Manifolds** * **Steering Column Components** * **Turbocharger Housings** * **Aerospace & Defense:** * **Aircraft Instrument Housings** * **Avionics Equipment Casings** * **Communication System Enclosures** * **Military Equipment Components** * **Electronics & Telecommunications:** * **Laptop Computer Housings** * **Server and Network Equipment Enclosures** * **Power Tool Housings** * **High-Performance Electronic Enclosures** * **Industrial Applications:** * **Power Tool Components** * **Industrial Machinery Parts** * **Material Handling Equipment** * **Robotic Component Housings** --- #### **5. Manufacturing Characteristics** **Casting Performance:** * Excellent fluidity for thin-walled castings (1.2-2.0 mm) * Good hot tearing resistance * Low solidification shrinkage * Excellent dimensional stability * Fast cycle times in high-pressure die casting **Secondary Processing:** * Excellent machinability with good surface finish * Good weldability using TIG and MIG processes * Excellent paint adhesion characteristics * Responsive to various surface treatments * Suitable for various finishing operations --- **Summary** **Melmag AT61 Magnesium Alloy** represents an advanced magnesium-aluminum-tin alloy that offers significant improvements in mechanical properties and elevated temperature performance compared to conventional magnesium alloys. The unique addition of **Tin** to the Mg-Al system enhances strength and refines the microstructure, while maintaining good ductility and corrosion resistance. Compliance with international standards including **ASTM B94** and **ISO 16220** ensures consistent quality and reliability. AT61's balanced combination of strength, ductility, and good elevated temperature performance makes it particularly suitable for automotive powertrain components, aerospace applications, and high-performance electronics where enhanced mechanical properties are required. The alloy continues to expand the application possibilities for magnesium in demanding environments, providing designers and engineers with a reliable, high-performance material solution that combines the inherent advantages of magnesium with improved mechanical and thermal characteristics.

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 3427 gallon liquid totes Special package is available on request.