Magnesium ZC71,UNS M16710; ,E FOUR

### **Product Datasheet: Magnesium ZC71 (UNS M16710)** **High-Performance Zinc-Copper Magnesium Alloy for Specialized Applications** --- #### **1. Overview** Magnesium ZC71 (UNS M16710) is a high-performance magnesium alloy characterized by significant zinc and copper additions, creating a material with enhanced strength and casting capabilities. This alloy represents an evolution in the magnesium-zinc-copper system, designed to provide improved mechanical properties while maintaining good castability. While typically used in the as-cast (F) or heat-treated (T5/T6) conditions, ZC71 offers a balanced combination of strength, ductility, and manufacturing flexibility for demanding engineering applications. --- #### **2. Key Features & Advantages** - **Enhanced Strength Properties:** Higher zinc content provides improved mechanical strength - **Good Casting Characteristics:** Suitable for various casting methods with minimal porosity - **Heat Treatable:** Can be precipitation hardened to achieve optimal properties - **Good Machinability:** Can be precision machined to close tolerances - **Cost-Effective Solution:** Provides performance benefits without rare earth element costs - **Versatile Processing:** Adaptable to multiple manufacturing methods --- #### **3. Chemical Composition (Weight %)** | Element | Mg (Balance) | Zn | Cu | Mn (max) | Si (max) | Other (max) | |---------------|--------------|------------|------------|------------|------------|-------------| | **Content (%)** | - | 6.5-7.5 | 1.0-1.5 | 0.15 | 0.10 | 0.30 total | *Note: The increased zinc content compared to ZC63 provides enhanced solid solution strengthening, while copper contributes to precipitation hardening potential during heat treatment.* --- #### **4. Typical Physical & Mechanical Properties** | Property | Value (As-Cast) | Value (T6 Temper) | Condition / Remarks | |---------------------------|-------------------------|------------------------|---------------------| | **Density** | 1.87 g/cm³ | 1.87 g/cm³ | | | **Melting Range** | 465-585°C (869-1085°F) | 465-585°C (869-1085°F) | | | **Thermal Conductivity** | 82 W/m·K | 80 W/m·K | At 25°C | | **Ultimate Tensile Strength** | 220 MPa (32 ksi) | 260 MPa (38 ksi) | Room Temperature | | **Tensile Yield Strength**| 125 MPa (18 ksi) | 180 MPa (26 ksi) | 0.2% offset, RT | | **Elongation** | 4-6% | 3-5% | In 2 inches, RT | | **Compressive Yield Strength** | 125 MPa (18 ksi) | 180 MPa (26 ksi) | | | **Shear Strength** | 135 MPa (20 ksi) | 155 MPa (22 ksi) | | | **Fatigue Strength** | 85 MPa (12 ksi) | 100 MPa (15 ksi) | 5×10⁷ cycles, RT | | **Elastic Modulus** | 45 GPa (6.5×10⁶ psi) | 45 GPa (6.5×10⁶ psi) | | | **Hardness** | 60-70 HB | 75-85 HB | | --- #### **5. International Standards** ZC71 is specified in the following standards: - **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 - **Customer-Specific Specifications:** Often tailored to application requirements --- #### **6. Applications** - **Automotive Components:** - High-stress transmission housings - Engine mounting brackets - Structural chassis components - Specialty wheel applications - **Aerospace Components:** - Non-critical structural components - Equipment housings and brackets - Interior structural elements - **Industrial Equipment:** - High-load gearbox components - Heavy-duty power tool housings - Industrial pump bodies and components - Machinery structural parts - **Defense Applications:** - Portable equipment housings - Weapon system components - Military vehicle parts - **Specialty Applications:** - Racing components - High-performance sporting goods - Professional equipment enclosures --- #### **7. Heat Treatment & Processing** - **Solution Treatment (T6):** 480°C (896°F) for 6-10 hours followed by quenching - **Artificial Aging (T6):** 170°C (338°F) for 10-20 hours - **Aging Only (T5):** 170°C (338°F) for 10-20 hours (after casting) - **Casting Methods:** - Sand casting (most common) - Permanent mold casting - Low-pressure die casting - **Machining:** Excellent machinability with proper techniques - **Joining:** Weldable using TIG methods with compatible filler rods - **Surface Protection:** Requires standard magnesium corrosion protection --- #### **8. Special Considerations** - **Temperature Limitation:** Maximum service temperature 120°C (250°F) for sustained loading - **Corrosion Protection:** Requires appropriate coatings for harsh environments - **Casting Design:** Benefits from controlled solidification rates - **Quality Control:** Standard foundry practices with mechanical property verification --- **Disclaimer** This technical data is for informational purposes only. Properties may vary depending on casting method, section size, and heat treatment parameters. Users should conduct appropriate testing to verify suitability for specific applications and consult relevant material specifications before use. Proper safety precautions for magnesium processing must always be followed, particularly regarding fire hazards during machining operations.

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 3358 gallon liquid totes Special package is available on request.