Magnesium AM20-F, Die Cast,E FOUR

### **Product Datasheet: Magnesium AM20-F Die Cast Alloy** **Introduction** Magnesium AM20-F is a high-ductility magnesium die casting alloy known for its exceptional impact strength and energy absorption capabilities. The "A" designates aluminum as the primary alloying element, "M" represents manganese, and "20" indicates approximately 2% aluminum content. The **-F temper** signifies that the material is used in the as-fabricated state directly from the die casting process. AM20-F offers the best ductility and impact resistance among standard magnesium die casting alloys, making it ideal for applications requiring high toughness and energy absorption. **Key Characteristics** - **Exceptional Ductility**: Highest elongation among commercial magnesium die casting alloys - **Superior Impact Strength**: Excellent energy absorption characteristics - **Good Damping Capacity**: Effective vibration and noise reduction - **Excellent Castability**: Superior fluidity for thin-walled components - **Good Corrosion Resistance**: Comparable to other magnesium-aluminum alloys --- #### **1. Chemical Composition (Weight %)** The composition conforms to standard specifications for AM20 alloy: | Element | Content (%) | |---------|-------------| | **Aluminum (Al)** | 1.7 - 2.5 | | **Manganese (Mn)** | 0.20 - 0.40 | | **Zinc (Zn)** | ≤ 0.20 | | **Silicon (Si)** | ≤ 0.10 | | **Copper (Cu)** | ≤ 0.08 | | **Iron (Fe)** | ≤ 0.004 | | **Nickel (Ni)** | ≤ 0.001 | | **Other Elements** | ≤ 0.30 (total) | | **Magnesium (Mg)** | Remainder | --- #### **2. Physical Properties** | Property | Value | |----------|--------| | **Density** | 1.77 g/cm³ (0.064 lb/in³) | | **Melting Range** | 610 - 630°C (1130 - 1166°F) | | **Thermal Conductivity** | 85 W/m·K | | **Coefficient of Thermal Expansion** | 25.9 µm/m·K (20-100°C) | | **Modulus of Elasticity** | 45 GPa (6.5 × 10⁶ psi) | | **Specific Heat Capacity** | 1050 J/kg·K | | **Solidification Shrinkage** | 4% | --- #### **3. Mechanical Properties (As Die Cast)** **Room Temperature Properties:** | Property | Value | |----------|--------| | **Tensile Strength, Ultimate** | 185 - 230 MPa (26,800 - 33,400 psi) | | **Tensile Strength, Yield (0.2% Offset)** | 90 - 120 MPa (13,000 - 17,400 psi) | | **Elongation** | 12 - 20% (in 2 inches) | | **Compressive Yield Strength** | 90 - 120 MPa (13,000 - 17,400 psi) | | **Hardness, Brinell** | 40 - 50 HB | | **Shear Strength** | 115 - 140 MPa (16,700 - 20,300 psi) | | **Fatigue Strength** | 70 - 90 MPa (10,200 - 13,100 psi) | | **Impact Strength (Charpy)** | 4 - 6 J (3.0 - 4.4 ft-lb) | **Notable Properties:** - Excellent energy absorption: 25-30 J/cm³ - Good damping capacity: 5-10 times better than aluminum - Low notch sensitivity --- #### **4. International Standards** AM20-F is recognized in several international standards: - **ASTM**: **ASTM B94** - Standard Specification for Magnesium-Alloy Die Castings - **ISO**: **ISO 16220** - Magnesium and magnesium alloys - Magnesium alloy ingots and castings - **EN**: **EN 1753** - Magnesium and magnesium alloys - **JIS**: **JIS H 2221** - Magnesium alloy die castings - **SAE**: **SAE J465** - Wrought and Cast Magnesium Alloys - **UNS**: **M10200** - **DIN**: **DIN 1729-2** - Magnesium casting alloys --- #### **5. Product Applications** AM20-F is particularly suited for applications requiring high ductility and impact resistance: **Automotive Applications:** - Steering wheel cores - Seat frames and components - Instrument panel structures - Interior trim components - Bracket and support elements **Aerospace Applications:** - Aircraft interior components - Electronic equipment housings - Non-structural aircraft parts - Avionics enclosures **Consumer Electronics:** - Laptop computer cases - Camera body frames - Portable device housings - Projector cases **Industrial Applications:** - Power tool housings - Equipment covers and enclosures - Machinery guards - Vibration-sensitive components --- #### **6. Die Casting Characteristics** **Process Parameters:** - **Die Temperature**: 250-300°C (480-570°F) - **Metal Temperature**: 640-680°C (1185-1255°F) - **Injection Speed**: 35-45 m/s - **Gate Speed**: 40-60 m/s **Design Advantages:** - Excellent for thin-walled castings (down to 1.0mm) - Low hot cracking tendency - Good surface finish quality - Minimal porosity in properly designed castings --- #### **7. Manufacturing Considerations** **Machinability:** - Excellent machining characteristics - Good surface finish - Long tool life - Low cutting forces required **Joining Methods:** - Adhesive bonding (excellent) - Mechanical fastening - TIG welding (with proper precautions) - Riveting and clinching **Surface Treatment:** - Chromate conversion coating - Powder coating and painting - Electroplating (with special pre-treatment) - Anodizing (HAE, Magoxid-Coat) **Heat Treatment:** - Generally used in as-cast condition (F temper) - Not typically heat treated due to potential grain growth --- **Technical Notes:** 1. AM20-F provides the best impact resistance among standard Mg die casting alloys 2. Ideal for safety-critical components requiring energy absorption 3. Excellent for components subject to bending and deformation 4. Lower strength but higher ductility compared to AZ91D and AM60A 5. Good performance at low temperatures down to -40°C **Disclaimer:** This information is provided for reference purposes only. Actual properties may vary depending on die casting parameters, component design, and wall thickness. Users should verify suitability for specific applications through appropriate testing and consult current material specifications for design and procurement purposes.

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 3275 gallon liquid totes Special package is available on request.