Magnesium AZ91C-F, Cast，UNS M11914;,E FOUR

Product Datasheet: Magnesium Alloy AZ91C-F (Cast), UNS M11914** **1. Overview** Magnesium Alloy AZ91C-F is a cast magnesium-aluminum-zinc alloy supplied in the as-cast condition. The **"F"** temper designation indicates that the castings are used in their final state **without any thermal treatment** after the casting process. This alloy is typically produced using sand casting or permanent mold casting methods, and represents the most basic form of the AZ91C composition with minimal post-processing. While newer high-purity variants like AZ91E have largely replaced AZ91C for critical applications, AZ91C-F remains relevant for non-structural components where cost-effectiveness and basic mechanical properties are prioritized over maximum corrosion resistance. **2. Key Advantages** * **Cost-Effective Production:** Eliminates expenses associated with heat treatment processes * **Good Castability:** Excellent fluidity and mold-filling characteristics for complex geometries * **Adequate Strength-to-Weight Ratio:** Suitable for lightweight applications not requiring maximum mechanical properties * **Good Machinability:** Can be easily machined with good surface finish * **Rapid Production Cycle:** No heat treatment required, enabling faster manufacturing turnaround **3. Chemical Composition (Weight % per ASTM B80)** | Element | Content (%) | Element | Content (%) | | :--- | :--- | :--- | :--- | | **Aluminum (Al)** | 8.3 - 9.7 | **Zinc (Zn)** | 0.40 - 1.0 | | **Manganese (Mn)** | 0.13 - 0.50 | **Silicon (Si)** | ≤ 0.30 | | **Copper (Cu)** | ≤ 0.10 | **Iron (Fe)** | ≤ 0.05 | | **Nickel (Ni)** | ≤ 0.03 | **Other Impurities** | ≤ 0.30 | | **Magnesium (Mg)** | Balance | | | *Note: The higher impurity limits (particularly Fe, Ni, Cu) compared to AZ91E make this alloy more susceptible to corrosion in aggressive environments.* **4. Physical & Mechanical Properties (Typical for Sand Cast F Temper)** | Property | Metric Unit | Imperial Unit | | :--- | :--- | :--- | | **Density** | 1.81 g/cm³ | 0.065 lb/in³ | | **Melting Range** | 470 - 595 °C | 878 - 1103 °F | | **Ultimate Tensile Strength** | 150 - 165 MPa | 22 - 24 ksi | | **Tensile Yield Strength (0.2%)** | 95 - 110 MPa | 14 - 16 ksi | | **Elongation (in 50mm)** | 1 - 3 % | 1 - 3 % | | **Compressive Yield Strength** | 95 - 110 MPa | 14 - 16 ksi | | **Hardness (Brinell)** | 60 - 65 HB | 60 - 65 HB | | **Modulus of Elasticity** | 45 GPa | 6.5 × 10⁶ psi | | **Shear Strength** | 110 - 125 MPa | 16 - 18 ksi | | **Fatigue Strength** | 70 - 85 MPa | 10 - 12 ksi | **5. International Standards** * **ASTM International:** * **ASTM B80:** Standard Specification for Magnesium-Alloy Sand Castings * **ASTM B93/B93M:** Standard Specification for Magnesium Alloys in Ingot Form for Sand Castings, Permanent Mold Castings, and Die Castings * **SAE International:** * **SAE AMS 4435:** Magnesium Alloy Sand Castings * **Unified Numbering System (UNS):** * **UNS M11914** * **ISO Standards:** * **ISO 16220:** Magnesium and magnesium alloys - Cast products **6. Product Applications** AZ91C-F is typically used in non-critical applications where mechanical stresses are minimal: * **Industrial Components:** * Machinery housings and covers * Instrument casings * Pump bodies for non-corrosive fluids * **Automotive Non-Structural Parts:** * Bracket assemblies * Cover plates * * * **7. Technical Considerations** * **As-Cast Microstructure:** Contains eutectic phases (Mg₁₇Al₁₂) in the grain boundaries, which can affect mechanical properties * **Residual Stresses:** May contain internal stresses from the casting process * **Corrosion Protection:** Requires surface treatments (chromate conversion, painting) for service in humid or corrosive environments * **Limited Ductility:** Lower elongation compared to heat-treated tempers (T4, T6) * **Dimensional Stability:** May be subject to slight dimensional changes if subsequently heat-treated **8. Comparison with Heat-Treated Tempers** * **vs. T4 (Solution Treated):** Lower strength and significantly reduced ductility * **vs. T6 (Aged):** Approximately 40-50% lower yield strength and reduced hardness * **vs. AZ91E-F:** Similar mechanical properties but inferior corrosion resistance due to higher impurity content **9. Manufacturing Notes** * **Casting Methods:** Suitable for sand casting and permanent mold casting * **Solution Heat Treatment:** Can be subsequently heat treated to T4 condition if required * **Surface Preparation:** Typically requires grinding or blasting to remove surface oxides * **Quality Control:** Non-destructive testing recommended for critical areas --- **Disclaimer:** This information is for reference purposes only. Mechanical properties may vary based on casting method, section size, cooling rates, and foundry practices. AZ91C-F is not recommended for applications requiring high corrosion resistance or optimal mechanical properties. For new designs, consider specifying high-purity AZ91E or heat-treated tempers. Always consult certified test data for critical 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 3313 gallon liquid totes Special package is available on request.