Melmag AP65 Magnesium Alloy ,E FOUR

### **Melmag AP65 Magnesium Alloy** **Product Overview** Melmag AP65 is a specialized magnesium-aluminum-manganese die casting alloy specifically engineered for applications requiring excellent corrosion resistance combined with good mechanical properties and castability. As part of the advanced Mg-Al-Mn system, AP65 offers superior performance in corrosive environments while maintaining the lightweight advantages of magnesium, making it particularly suitable for automotive, aerospace, and consumer electronics applications where reliability and durability are critical. This alloy is primarily supplied as high-pressure die castings, with optimized properties for components exposed to demanding environmental conditions. --- #### **1. Chemical Composition** AP65 features a carefully controlled aluminum-manganese composition with stringent impurity limits. | Element | Composition (% by Weight) | | :---------------- | :-------------------------------- | | **Aluminum (Al)** | 5.5 - 6.5 % | | **Manganese (Mn)** | 0.25 - 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 balanced **aluminum** content provides good strength and castability while minimizing the formation of excessive brittle phases. **Manganese** plays a crucial role in enhancing corrosion resistance by controlling iron impurities, while the ultra-low levels of **copper**, **iron**, and **nickel** ensure exceptional corrosion performance. --- #### **2. Physical & Mechanical Properties** AP65 exhibits a well-balanced combination of physical and mechanical properties with emphasis on corrosion resistance. **Physical Properties:** * **Density:** 1.78 g/cm³ (0.064 lb/in³) * **Melting Range:** 550 - 620 °C (1022 - 1148 °F) * **Coefficient of Thermal Expansion:** 26.2 μm/m·°C (20-200°C) * **Thermal Conductivity:** 70 W/m·K * **Specific Heat Capacity:** 1050 J/kg·K **Typical Mechanical Properties (As-Die Cast):** * **Ultimate Tensile Strength (UTS):** 210 - 230 MPa (30 - 33 ksi) * **Tensile Yield Strength (TYS):** 120 - 140 MPa (17 - 20 ksi) * **Elongation:** 8 - 12% * **Compressive Yield Strength:** 120 - 140 MPa (17 - 20 ksi) * **Shear Strength:** 125 - 145 MPa (18 - 21 ksi) * **Fatigue Strength:** 100 - 120 MPa (15 - 17 ksi) * **Hardness:** 60 - 70 HBW * **Modulus of Elasticity:** 45 GPa (6.5 × 10³ ksi) **Corrosion Performance:** * **Excellent salt spray resistance** (> 500 hours to first red rust) * **Superior general corrosion resistance** in various environments * **Good galvanic corrosion performance** when properly isolated * **Excellent stress corrosion cracking resistance** --- #### **3. International Standards & Specifications** AP65 complies with major international standards 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** * **JIS Standards:** **JIS H 5303** * **GB Standards:** **GB/T 19078** * **Proprietary Designation:** **Melmag AP65** --- #### **4. Product Applications** AP65 is widely used in applications where corrosion resistance is a primary concern. * **Automotive Industry:** * **Transmission Housings and Components** * **Engine Bracket Systems** * **Steering Column Components** * **Seat Frame Structures** * **Electronic Control Unit Housings** * **Aerospace & Defense:** * **Aircraft Instrument Housings** * **Avionics Equipment Casings** * **Communication System Enclosures** * **Military Electronic Housing Components** * **Electronics & Telecommunications:** * **Server and Network Equipment Housings** * **Portable Electronic Device Frames** * **Antenna Housing Components** * **Power Supply Enclosures** * **Consumer & Industrial Applications:** * **Power Tool Housings** * **Outdoor Equipment Components** * **Marine Equipment Parts** * **Medical Device Housings** --- #### **5. Manufacturing Characteristics** **Die Casting Performance:** * Excellent fluidity for thin-walled castings (1.2-1.8 mm) * Good hot tearing resistance * Low solidification shrinkage * Excellent dimensional stability * Fast cycle times in high-pressure die casting **Secondary Processing:** * Good machinability with excellent surface finish * Excellent paint adhesion and coating compatibility * Good weldability using TIG and MIG processes * Responsive to various surface treatments * Suitable for various finishing operations --- **Summary** **Melmag AP65 Magnesium Alloy** represents a significant advancement in corrosion-resistant magnesium die casting technology, offering superior performance in demanding environmental conditions. The alloy's optimized **aluminum-manganese** composition with **ultra-low impurity levels** delivers exceptional corrosion resistance while maintaining good mechanical properties and excellent castability. Compliance with international standards including **ASTM B94** and **ISO 16220** ensures consistent quality and reliability. AP65's balanced property profile makes it particularly valuable for automotive, aerospace, and electronics applications where components must withstand corrosive environments while maintaining structural integrity and lightweight advantages. The alloy continues to expand the application possibilities for magnesium in challenging service conditions, providing designers and engineers with a reliable, high-performance material solution that combines the inherent benefits of magnesium with enhanced durability and corrosion resistance.

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 3425 gallon liquid totes Special package is available on request.