Magnesium ZC71-T5， UNS M16710; ,E FOUR

### **Product Datasheet: Magnesium ZC71-T5 (UNS M16710)** **High-Strength Artificially Aged Magnesium Casting Alloy** --- #### **1. Overview** Magnesium ZC71-T5 (UNS M16710) is a high-strength magnesium casting alloy that achieves enhanced mechanical properties through artificial aging after the casting process. The T5 temper (artificially aged only) provides a significant improvement in strength and hardness over the as-cast condition, while offering manufacturing advantages by eliminating the solution heat treatment step. This zinc and copper-containing alloy delivers an excellent balance of strength, castability, and cost-effectiveness for automotive, industrial, and general engineering applications. --- #### **2. Key Features & Advantages** - **Enhanced Mechanical Properties:** Improved strength and hardness through precipitation hardening - **Simplified Heat Treatment:** Requires only aging treatment, reducing processing complexity and cost - **Good Castability:** Suitable for sand and permanent mold casting processes - **Excellent Strength-to-Weight Ratio:** High mechanical properties with low density - **Good Machinability:** Can be precision machined with excellent surface finish - **Cost-Effective Manufacturing:** Lower processing costs compared to T6 treatment - **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 zinc and copper combination creates precipitates that respond to artificial aging, enhancing strength while maintaining adequate ductility in the T5 condition.* --- #### **4. Typical Physical & Mechanical Properties (T5 Temper)** | Property | Value | Condition / Remarks | |---------------------------|------------------------------|---------------------| | **Density** | 1.87 g/cm³ (0.0675 lb/in³) | | | **Melting Range** | 465-585°C (869-1085°F) | | | **Thermal Conductivity** | 82 W/m·K | At 25°C | | **Specific Heat Capacity**| 1040 J/kg·K | At 25°C | | **Coefficient of Thermal Expansion** | 26.5 × 10⁻⁶/°C | 20-100°C | | **Ultimate Tensile Strength** | 240-280 MPa (35-41 ksi) | Room Temperature | | **Tensile Yield Strength**| 160-190 MPa (23-28 ksi) | 0.2% offset, RT | | **Elongation** | 4-8% | In 2 inches, RT | | **Compressive Yield Strength** | 160-190 MPa (23-28 ksi) | | | **Shear Strength** | 145-165 MPa (21-24 ksi) | | | **Fatigue Strength** | 95-110 MPa (14-16 ksi) | 10⁷ cycles, RT | | **Elastic Modulus** | 45 GPa (6.5×10⁶ psi) | | | **Hardness** | 70-80 HB | | | **Impact Toughness** | 5-7 J | Charpy, V-notch | --- #### **5. International Standards** ZC71-T5 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 - **EN 1753:** European Standard for Magnesium Castings --- #### **6. Applications** - **Automotive Components:** - Transmission housings and cases - Engine mounting brackets - Suspension components - Steering system parts - Wheel hubs and components - **Industrial Equipment:** - Power tool housings and gearboxes - Pump bodies and impellers - Compressor components - Material handling equipment parts - Machine tool components - **Aerospace Components:** - Non-structural brackets and mounts - Equipment housings - Interior components - Accessory supports - **Consumer Products:** - High-performance sporting goods - Professional equipment enclosures - Camera and optical equipment bodies - Audio equipment components - **General Engineering:** - Structural brackets and frames - Machinery components - Specialized tooling applications --- #### **7. Heat Treatment & Processing** - **Artificial Aging (T5):** 170°C ± 5°C (338°F ± 9°F) for 16-24 hours - **Casting Methods:** - Sand casting (primary application) - Permanent mold casting - Low-pressure die casting - **Machining:** Excellent machinability with high material removal rates - **Joining:** Weldable using TIG methods with compatible filler materials - **Surface Treatment:** Requires standard magnesium protection schemes - **Stress Relieving:** Optional stress relief at 200°C (392°F) for 2-4 hours --- #### **8. Special Considerations** - **Temperature Limit:** Maximum service temperature: 120°C (250°F) - **Corrosion Protection:** Requires conversion coatings for harsh environments - **Aging Uniformity:** Critical for consistent mechanical properties throughout casting - **Casting Design:** Benefits from uniform section thickness and proper feeding - **Quality Control:** 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 aging conditions. ZC71-T5 offers a cost-effective alternative to T6 treatment while providing substantial strength improvement over the as-cast condition. 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 3360 gallon liquid totes Special package is available on request.