Magnesium HM31A-O (UNS M13312)
Magnesium HM31A-O is a high-performance magnesium alloy recognized for its strength, creep resistance, and corrosion resistance at elevated temperatures. Commonly used in aerospace, automotive, and defense industries, it provides a strong yet lightweight solution for demanding applications where thermal stability and machinability are critical.
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| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Magnesium | —— | Remainder |
| Manganese | 1.2% | —— |
| Thorium | 2.5% | 3.5% |
The following table provides a list of magnesium HM31A-O properties in both SI and US customary/Imperial units.
Click on the button to switch between Metric and Imperial units.
| Physical Properties | Metric |
|---|---|
| Density | 1800 kg/m3 |
| Mechanical Properties | Metric |
| Tensile Strength (Ultimate) | 283 MPa |
| Tensile Strength (Yield) | 230 MPa |
| Elongation at Break | 10% |
| Thermal Properties | Metric |
| Melting Point | 605 - 650 °C |
| Solidus | 605 °C |
| Liquidus | 650 °C |
| Thermal Conductivity | 104 W/m·K |
| Specific Heat Capacity (Cp) | 1050 J/kg·K |
| Coefficient of Thermal Expansion (αL) | 26.0 1/°C |
| Electrical Properties | Metric |
| Electrical Resistivity | 6.60×10-6 Ω·cm |
The values in this table are approximate and can vary depending on various factors such as the specific manufacturing process and heat treatment applied to the alloy.
Advantages & Disadvantages of Magnesium HM31A O
| Advantages | Disadvantages |
|---|---|
| High strength | High cost |
| Corrosion resistance | Poor weldability |
| Good machinability | Low melting point |
| Lightweight | Low stiffness |
| Versatile | Limited availability |
Applications of Magnesium HM31A O
Thanks to its excellent strength-to-weight ratio and resistance to corrosion and heat, HM31A-O is widely used across multiple high-performance sectors, including:
- Aerospace: Used in aircraft structures such as wings, fuselages, and landing gear. Also utilized in engine components like pistons and connecting rods.
- Defense: Applied in tanks, armored vehicles, and weapons. Also found in night vision goggles and other electronic equipment.
- Automotive: Incorporated in engine blocks, chassis components, and wheels. Also used in brake rotors and other high-performance parts.
- Medical: Used in implants, including hip replacements and dental fillings. Also employed in surgical tools such as scalpels and needles.
- Consumer goods: Found in sporting equipment like golf clubs and bicycles, as well as electronics such as laptops and mobile phones.