Magnesium ZC71-T6,,E FOUR

### **Product Datasheet: Magnesium ZC71-T6 (UNS M16710)** **High-Strength Heat-Treated Magnesium Casting Alloy** --- #### **1. Overview** Magnesium ZC71-T6 (UNS M16710) is a high-strength, heat-treatable casting alloy that achieves optimal mechanical properties through a precise combination of zinc and copper additions, followed by T6 heat treatment (solution heat treatment and artificial aging). This alloy offers an exceptional balance of strength, castability, and cost-effectiveness, making it suitable for applications requiring high mechanical performance at room temperature. The T6 temper significantly enhances the alloy's yield and tensile strength while maintaining adequate ductility for engineering applications. --- #### **2. Key Features & Advantages** - **High Strength-to-Weight Ratio:** Superior mechanical properties with magnesium's inherent lightness - **Excellent Castability:** Produces sound castings with minimal porosity in sand and permanent mold processes - **Precipitation Hardenable:** Responds well to T6 heat treatment for maximum strength - **Good Machinability:** Can be precision machined to close tolerances - **Cost-Effective:** Achieves high performance without rare earth element additions - **Good Wear Resistance:** Suitable for moving components and bearing surfaces --- #### **3. Chemical Composition (Weight %)** | Element | Magnesium (Balance) | Zinc | Copper | Manganese (max) | Silicon (max) | Other Elements (max) | |---------------|---------------------|--------------|--------------|-----------------|---------------|----------------------| | **Content (%)** | - | 6.5-7.5 | 1.0-1.5 | 0.15 | 0.10 | 0.30 total | *Note: The balanced zinc and copper composition creates intermetallic compounds that respond to precipitation hardening during T6 heat treatment, providing significant strength improvement over the as-cast condition.* --- #### **4. Typical Physical & Mechanical Properties (T6 Temper)** | Property | Value | Condition / Remarks | |---------------------------|------------------------------|---------------------| | **Density** | 1.87 g/cm³ (0.0675 lb/in³) | | | **Melting Range** | 465-585°C (869-1085°F) | | | **Thermal Conductivity** | 80 W/m·K | At 25°C | | **Specific Heat Capacity**| 1050 J/kg·K | At 25°C | | **Coefficient of Thermal Expansion** | 26.3 × 10⁻⁶/°C | 20-100°C | | **Ultimate Tensile Strength** | 260-300 MPa (38-44 ksi) | Room Temperature | | **Tensile Yield Strength**| 180-220 MPa (26-32 ksi) | 0.2% offset, RT | | **Elongation** | 3-6% | In 2 inches, RT | | **Compressive Yield Strength** | 180-220 MPa (26-32 ksi) | | | **Shear Strength** | 155-175 MPa (22-25 ksi) | | | **Fatigue Strength** | 100-120 MPa (15-17 ksi) | 10⁷ cycles, RT | | **Elastic Modulus** | 45 GPa (6.5×10⁶ psi) | | | **Hardness** | 75-85 HB | | | **Impact Toughness** | 4-6 J | Charpy, V-notch | --- #### **5. International Standards** ZC71-T6 conforms to the following international specifications: - **ASTM B80:** Standard Specification for Magnesium-Alloy Sand Castings - **ASTM B199:** Specification for Magnesium-Alloy Permanent Mold Castings - **UNS M16710:** Unified Numbering System designation - **ISO 16220:** Magnesium and magnesium alloys - Castings - **AMS 4439:** Aerospace Material Specification (when applicable) --- #### **6. Applications** - **Automotive Components:** - High-performance transmission cases - Engine structural components - Suspension system brackets - Steering system components - Specialty racing components - **Aerospace Applications:** - Non-primary structural brackets - Equipment mounting frames - Accessory housings - Interior structural components - **Industrial Equipment:** - High-stress gearbox housings - Industrial robot components - Compressor parts - Material handling equipment - **Defense Systems:** - Weapon system components - Military vehicle parts - Portable equipment structures - **Consumer & Commercial:** - High-end sporting equipment - Professional audio hardware - Medical equipment housings --- #### **7. Heat Treatment & Processing** - **Solution Treatment:** 480°C ± 5°C (896°F ± 9°F) for 8-12 hours under protective atmosphere - **Quenching:** Hot water quenching at 60-80°C (140-176°F) - **Artificial Aging:** 170°C ± 5°C (338°F ± 9°F) for 16-24 hours - **Casting Methods:** - Sand casting (primary method) - Permanent mold casting - Low-pressure die casting - **Machining:** Excellent machinability with high surface quality achievable - **Joining:** Weldable using TIG methods with proper filler materials - **Surface Treatment:** Requires standard magnesium protection schemes --- #### **8. Special Considerations** - **Temperature Limit:** Maximum continuous service temperature: 120°C (250°F) - **Corrosion Protection:** Requires conversion coatings or anodizing for harsh environments - **Heat Treatment Control:** Critical for achieving consistent mechanical properties - **Casting Design:** Benefits from controlled solidification and feeding systems - **Quality Assurance:** Mechanical testing recommended for critical applications --- **Disclaimer** This technical data is provided for informational purposes only. Properties may vary depending on casting parameters, section size, and specific heat treatment conditions. ZC71-T6 is not recommended for applications requiring elevated temperature performance above 120°C or in highly corrosive environments without adequate protection. Users should conduct appropriate testing to verify suitability for specific applications and consult relevant material specifications before use. All processing must follow established safety procedures for magnesium alloys.

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 3359 gallon liquid totes Special package is available on request.