Magnesium ZK61A-T5, Forgings，UNS M16611; Mg; AMS 4444; ASTM B 80; SAE J465; Old SAE 513 (Ingot UNS M16610),E FOUR

### **Product Datasheet: Magnesium ZK61A-T5, Forgings (UNS M16611)** **Premium High-Strength Forged Magnesium Alloy** --- #### **1. Overview** Magnesium ZK61A-T5 (UNS M16611) is a premium high-strength magnesium forging alloy that achieves exceptional mechanical properties through the combination of optimized zinc content, zirconium grain refinement, and T5 artificial aging treatment. Conforming to AMS 4444, ASTM B80, and SAE J465 specifications, this alloy represents one of the highest strength magnesium materials available for forged components. The forging process produces superior grain flow and mechanical properties compared to cast products, making it ideal for critical aerospace and defense applications. --- #### **2. Key Features & Advantages** - **Exceptional Strength-to-Weight Ratio:** Highest strength among magnesium forging alloys - **Superior Grain Structure:** Optimized grain flow from forging process - **Excellent Fatigue Performance:** Enhanced dynamic load capability - **Good Corrosion Resistance:** Meets aerospace environmental requirements - **Reliable Performance:** Consistent properties through T5 heat treatment - **Complex Geometries:** Capable of producing intricate forged shapes - **Proven Heritage:** Extensive use in aerospace applications --- #### **3. Chemical Composition (Weight %)** As specified in AMS 4444, ASTM B80, and SAE J465: | Element | Magnesium (Balance) | Zinc | Zirconium | Manganese (max) | Silicon (max) | Other Elements (max) | |---------------|---------------------|--------------|--------------|-----------------|---------------|---------------------| | **Content (%)** | - | 5.5-6.5 | 0.45-1.0 | 0.15 | 0.10 | 0.30 total | *Ingot Designation: UNS M16610* *Old SAE Designation: SAE 513 (Superseded)* *Note: The carefully balanced high zinc content provides maximum solid solution strengthening, while zirconium ensures fine, uniform grain structure throughout the forging, creating optimal conditions for T5 aging response.* --- #### **4. Typical Physical & Mechanical Properties (T5 Temper - Forgings)** **Physical Properties:** | Property | Value | |---------------------------|------------------------------| | **Density** | 1.83 g/cm³ (0.0661 lb/in³) | | **Melting Range** | 515-630°C (959-1166°F) | | **Thermal Conductivity** | 112 W/m·K | | **Specific Heat Capacity**| 1005 J/kg·K | | **Coefficient of Thermal Expansion** | 25.3 × 10⁻⁶/°C | | **Forging Temperature Range** | 350-450°C (662-842°F) | **Mechanical Properties (Forged & T5 Aged):** | Property | Minimum | Typical | |---------------------------|----------------|----------------| | **Ultimate Tensile Strength** | 275 MPa (40 ksi) | 310 MPa (45 ksi) | | **Tensile Yield Strength**| 195 MPa (28 ksi) | 215 MPa (31 ksi) | | **Elongation** | 5% | 8% | | **Compressive Yield Strength** | 195 MPa (28 ksi) | 215 MPa (31 ksi) | | **Shear Strength** | 180 MPa (26 ksi) | 195 MPa (28 ksi) | | **Fatigue Strength** | 125 MPa (18 ksi) | 140 MPa (20 ksi) | | **Elastic Modulus** | 45 GPa (6.5×10⁶ psi) | 45 GPa (6.5×10⁶ psi) | | **Hardness** | 70 HB | 75 HB | | **Impact Toughness** | 4 J | 6 J | | **Bearing Strength** | 480 MPa (70 ksi) | 520 MPa (75 ksi) | | **Bearing Yield Strength**| 345 MPa (50 ksi) | 380 MPa (55 ksi) | --- #### **5. International Standards & Specifications** ZK61A-T5 Forgings fully comply with: - **AMS 4444:** Aerospace Material Specification for Magnesium Alloy Forgings - **ASTM B80:** Standard Specification for Magnesium-Alloy Sand Castings (Reference) - **ASTM B91:** Standard Specification for Magnesium-Alloy Forgings - **SAE J465:** Wrought and Cast Magnesium Alloys - **UNS M16611:** Forging Designation - **UNS M16610:** Ingot Designation - **Old SAE 513:** Previous Designation (Superseded) --- #### **6. Applications** **Aerospace & Defense:** - Aircraft landing gear components - Helicopter rotor hubs and fittings - Missile body sections and control surfaces - Engine mounting brackets and supports - Wing spar attachments and fittings - Satellite structural components **Military Applications:** - Weapon system structural components - Armored vehicle parts - Portable equipment structural members - Military aircraft critical components **High-Performance Automotive:** - Racing suspension components - High-performance brake components - Motorcycle frames and triple clamps - Sports car structural members **Industrial Equipment:** - High-speed robotics components - Precision machinery structural parts - Material handling equipment critical components - Specialized tooling and fixtures --- #### **7. Forging & Processing Parameters** **Forging Conditions:** - **Billet Temperature:** 370-430°C (698-806°F) - **Die Temperature:** 260-320°C (500-608°F) - **Forging Pressure:** 60-120 MPa (9-17 ksi) - **Strain Rates:** Moderate for optimal grain flow - **Draft Angles:** 3-5° recommended **Heat Treatment (T5):** - **Artificial Aging:** 150-175°C (302-347°F) for 16-24 hours - **Temperature Control:** ±3°C (±5°F) for aerospace quality - **Atmosphere:** Air atmosphere acceptable - **Documentation:** Full heat treat records required **Machining Characteristics:** - **Machinability Rating:** Excellent - **Cutting Speed:** High-speed operations possible - **Surface Finish:** 0.8-1.6 μm Ra achievable - **Tool Life:** Extended compared to steel machining **Quality Control Requirements:** - **Ultrasonic Inspection:** Per required quality levels - **Dye Penetrant Testing:** For surface defect detection - **Mechanical Testing:** From forging extensions or coupons - **Microstructural Examination:** Grain size and flow verification --- #### **8. Design & Manufacturing Considerations** - **Parting Line Selection:** Critical for grain flow optimization - **Flash Design:** Proper flash land geometry important - **Fillet Radii:** Minimum 5 mm for stress reduction - **Wall Thickness:** Uniform sections preferred - **Grain Direction:** Align with primary stress directions - **Quality Documentation:** Full traceability for aerospace applications --- **Disclaimer** This technical data is based on industry standards and typical forging experience. Properties may vary depending on forging design, process parameters, and specific aging conditions. Users should consult the latest revisions of AMS 4444, ASTM B80, and SAE J465 specifications for current requirements. All manufacturing processes must follow established safety procedures for magnesium forging and machining operations. ZK61A-T5 represents a premium high-strength magnesium forging alloy suitable for the most demanding 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 3374 gallon liquid totes Special package is available on request.