ZA61A (AMS 4350) Magnesium Alloy,E FOUR

### **ZA61A Magnesium Alloy (AMS 4350)** **Product Overview** ZA61A is a high-strength magnesium-zinc-aluminum wrought alloy that offers an exceptional combination of mechanical properties and corrosion resistance. As specified in AMS 4350, this alloy is primarily used in aerospace applications where superior strength-to-weight ratio and reliable performance are critical requirements. The alloy's optimized zinc and aluminum content provides enhanced strength characteristics while maintaining good workability and manufacturing flexibility. This alloy is commonly supplied as extruded rods, bars, profiles, and forged components, with properties typically optimized through T5 (artificially aged) heat treatment. --- #### **1. Chemical Composition** ZA61A features a balanced zinc-aluminum composition designed for optimal strength and processability. | Element | Composition (% by Weight) | | :---------------- | :-------------------------------- | | **Zinc (Zn)** | 5.0 - 6.0 % | | **Aluminum (Al)** | 5.5 - 6.5 % | | **Manganese (Mn)** | 0.15 - 0.40 % | | **Copper (Cu)** | ≤ 0.05 % | | **Iron (Fe)** | ≤ 0.05 % | | **Nickel (Ni)** | ≤ 0.005 % | | **Silicon (Si)** | ≤ 0.10 % | | **Other Impurities** | ≤ 0.30 % (each) | | **Magnesium (Mg)** | Balance | *Note:* The balanced **zinc** and **aluminum** content provides solid solution strengthening and precipitation hardening capabilities. **Manganese** contributes to corrosion resistance by controlling iron impurities, while the strict limits on **copper** and **nickel** ensure good corrosion performance. --- #### **2. Physical & Mechanical Properties** ZA61A exhibits superior mechanical properties with good strength retention at elevated temperatures. **Physical Properties:** * **Density:** 1.83 g/cm³ (0.066 lb/in³) * **Melting Range:** 520 - 635 °C (968 - 1175 °F) * **Coefficient of Thermal Expansion:** 26.3 μm/m·°C (20-200°C) * **Thermal Conductivity:** 110 W/m·K * **Modulus of Elasticity:** 45 GPa (6.5 × 10³ ksi) **Typical Mechanical Properties (T5 Temper - Extruded):** * **Ultimate Tensile Strength (UTS):** 295 - 325 MPa (43 - 47 ksi) * **Tensile Yield Strength (TYS):** 195 - 225 MPa (28 - 33 ksi) * **Elongation:** 5 - 10% * **Compressive Yield Strength:** 195 - 225 MPa (28 - 33 ksi) * **Shear Strength:** 165 - 185 MPa (24 - 27 ksi) * **Fatigue Strength:** 130 - 150 MPa (19 - 22 ksi) * **Hardness:** 70 - 80 HBW **Elevated Temperature Performance:** * **Maintains useful mechanical properties up to 130°C (266°F)** * **Good creep resistance below 120°C** * **Adequate strength retention at 150°C** * **Gradual strength reduction above 150°C** --- #### **3. International Standards & Specifications** ZA61A is recognized by several major international standards organizations. * **Aerospace Material Specification:** **AMS 4350** (Primary governing specification) * **ASTM International:** **ASTM B107** (Standard Specification for Magnesium-Alloy Extruded Bars, Rods, Profiles, Tubes, and Wire) * **SAE International:** **SAE J465** * **UNS Designation:** **UNS M16610** * **Federal Standard:** **QQ-M-40** * **Proprietary Designation:** **ZA61A** (Industry Standard) --- #### **4. Product Applications** ZA61A is extensively used in aerospace and high-performance applications requiring superior strength. * **Aerospace & Defense:** * **Aircraft Landing Gear Components** * **Helicopter Rotor Hubs and Components** * **Missile Airframes and Structural Members** * **Aircraft Wing Panels and Ribs** * **Satellite Structural Components** * **Military Applications:** * **Weapon System Components** * **Military Vehicle Structural Parts** * **Portable Military Equipment** * **Armor System Components** * **High-Performance Automotive:** * **Racing Wheel Rims** * **High-Performance Suspension Components** * **Motorsport Structural Members** * **Competition Vehicle Chassis Components** * **Specialized Industrial:** * **High-Speed Machinery Components** * **Material Handling Equipment** * **Robotic Arm Components** * **Specialized Tooling Applications** --- #### **5. Manufacturing Characteristics** **Forming and Processing:** * **Good extrudability** for complex profiles * **Excellent forgeability** with proper temperature control * **Good hot workability** at 300-400°C * **Adequate rollability** for plate production **Secondary Processing:** * **Good machinability** with proper techniques * **Excellent weldability** using TIG and MIG processes * **Good response to T5 heat treatment** * **Compatible with standard surface treatments** * **Good fatigue resistance** in dynamic applications --- **Summary** **ZA61A Magnesium Alloy (AMS 4350)** represents a premium high-strength wrought magnesium alloy that delivers exceptional mechanical properties for demanding aerospace and defense applications. The optimized **zinc-aluminum** composition provides superior strength characteristics while maintaining adequate workability and corrosion resistance. Compliance with **AMS 4350** ensures the material meets the stringent requirements for aerospace applications where reliability and performance are critical. ZA61A's excellent strength-to-weight ratio, combined with good elevated temperature performance and manufacturing flexibility, makes it a preferred choice for structural components in aircraft, missiles, and high-performance vehicles. The alloy continues to serve important roles in weight-critical applications where its proven performance and certification to aerospace standards provide engineers with a reliable material solution for the most demanding structural requirements.

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 3436 gallon liquid totes Special package is available on request.