Magnesium ZC63-T6，UNS M16631; ,E FOUR

### **Product Datasheet: Magnesium ZC63-T6 (UNS M16631)** **High-Strength Zinc-Copper Magnesium Casting Alloy** --- #### **1. Overview** Magnesium ZC63-T6 (UNS M16631) is a high-strength precipitation-hardenable casting alloy that achieves its mechanical properties through zinc and copper additions. In the T6 temper (solution heat-treated and artificially aged), this alloy provides an excellent combination of strength, castability, and cost-effectiveness. While not suitable for elevated temperature applications above 150°C (300°F), ZC63-T6 offers superior room temperature mechanical properties compared to many conventional magnesium alloys, making it suitable for automotive and general industrial applications. --- #### **2. Key Features & Advantages** - **High Room Temperature Strength:** Excellent mechanical properties at ambient temperatures - **Good Castability:** Suitable for sand, permanent mold, and die casting processes - **Cost-Effective:** Utilizes lower-cost alloying elements compared to rare-earth containing alloys - **Good Pressure Tightness:** Minimal porosity in properly cast components - **Good Machinability:** Can be machined to high tolerances - **Good Wear Resistance:** Suitable for moving components --- #### **3. Chemical Composition (Weight %)** | Element | Mg (Balance) | Zn | Cu | Mn (max) | Si (max) | Other (max) | |---------------|--------------|------------|------------|------------|------------|-------------| | **Content (%)** | - | 5.5-6.5 | 2.5-3.5 | 0.15 | 0.10 | 0.30 total | *Note: Zinc provides solid solution strengthening while copper enables precipitation hardening through heat treatment. The combination delivers high strength at reasonable cost.* --- #### **4. Typical Physical & Mechanical Properties (T6 Temper)** | Property | Value | Condition / Remarks | |---------------------------|------------------------------|---------------------| | **Density** | 1.86 g/cm³ (0.067 lb/in³) | | | **Melting Range** | 470-590°C (878-1094°F) | | | **Thermal Conductivity** | 84 W/m·K | At 25°C | | **Coefficient of Thermal Expansion** | 26.5 × 10⁻⁶/°C | 20-100°C | | **Ultimate Tensile Strength** | 240 MPa (35 ksi) | Room Temperature | | **Tensile Yield Strength**| 145 MPa (21 ksi) | 0.2% offset, RT | | **Elongation** | 5-8% | In 2 inches, RT | | **Compressive Yield Strength** | 145 MPa (21 ksi) | | | **Shear Strength** | 130 MPa (19 ksi) | | | **Fatigue Strength** | 90 MPa (13 ksi) | 5×10⁷ cycles, RT | | **Elastic Modulus** | 45 GPa (6.5×10⁶ psi) | | | **Hardness** | 65-75 HB | | --- #### **5. International Standards** ZC63-T6 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 M16631:** Unified Numbering System designation - **ISO 16220:** Magnesium and magnesium alloys - Castings - **Proprietary Specifications:** Often supplied to customer-specific requirements --- #### **6. Applications** - **Automotive Components:** - Transmission cases and housings - Engine brackets and supports - Steering column components - Wheel rims (specialty vehicles) - **Industrial Equipment:** - Power tool housings - Compressor components - Pump housings and impellers - Material handling equipment parts - **Aerospace (Non-critical):** - Non-structural aircraft components - Accessory housings - Interior components - **Consumer Products:** - Sporting goods equipment - High-end camera bodies - Professional audio equipment housings --- #### **7. Heat Treatment & Processing** - **Solution Treatment:** 485°C (905°F) for 4-8 hours followed by quenching - **Artificial Aging:** 175°C (347°F) for 8-16 hours (T6 temper) - **Casting Methods:** - Sand casting (most common) - Permanent mold casting - Die casting (with modified parameters) - **Machining:** Good machinability with proper techniques and cooling - **Joining:** Can be welded using TIG methods with compatible filler rods - **Surface Protection:** Requires standard magnesium corrosion protection treatments --- #### **8. Special Considerations** - **Temperature Limitation:** Not recommended for sustained use above 150°C (300°F) - **Corrosion Protection:** Requires appropriate surface treatments for harsh environments - **Casting Design:** Requires attention to section transitions and feeding design - **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 3356 gallon liquid totes Special package is available on request.