Magnesium HK31A-O (UNS M13310)
HK31A-O is a high-strength magnesium alloy that is known for its good combination of creep resistance, pressure tightness, and castability. It is commonly used in aerospace applications due to its light weight and high strength-to-weight ratio.
| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Magnesium | Remainder | |
| Copper | 0.10% | |
| Nickel | 0.01% | |
| Thorium | 2.5% | 4.0% |
| Zinc | 0.30% | |
| Zirconium | 0.40% | 1.0% |
The following table provides a list of magnesium HK31A-O properties in both SI and US customary/Imperial units.
Click on the icon to switch between Metric and Imperial units.
| Physical Properties | Metric |
|---|---|
| Density | 1800 kg/m3 |
| Mechanical Properties | Metric |
| Tensile Strength (Ultimate) | 200 MPa |
| Tensile Strength (Yield) | 125 MPa |
| Compressive Strength (Yield) | 97 MPa |
| Young’s Modulus (E) | 45 GPa |
| Shear Modulus (G) | 17 GPa |
| Elongation at Break in 50 mm | 30% |
| Poisson’s Ratio (ν) | 0.35 |
| Machinability | 100% |
| Charpy Impact V-notch | 3.40 J |
| Thermal Properties | Metric |
| Melting Point | 590 - 650 °C |
| Solidus | 590 °C |
| Liquidus | 650 °C |
| Thermal Conductivity | 92 W/m·K |
| Specific Heat Capacity (Cp) | 1000 J/kg·K |
| Coefficient of Thermal Expansion (αL) | 26.8 1/°C |
| Heat of Fusion | 325 J/g |
| Electrical Properties | Metric |
| Electrical Resistivity | 6.00×10-6 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 HK31A-O
| Advantages | Disadvantages |
|---|---|
| High strength | Corrosion-prone |
| Light weight | High cost |
| Good castability | Low melting point |
| Creep resistance | Poor machinability |
Applications of Magnesium HK31A-O
Magnesium HK31A-O is a versatile material that can be used in a variety of applications. Some of the common applications of Magnesium HK31A-O include:
- Aircraft structures: Magnesium HK31A-O is used in a variety of aircraft structures, including fuselages, wings, and landing gear.
- Engine parts: Magnesium HK31A-O is used in a variety of engine parts, including pistons, connecting rods, and cylinder heads.
- Gearboxes: Magnesium HK31A-O is used in a variety of gearboxes, including those used in automobiles and motorcycles.
- Bearings: Magnesium HK31A-O is used in a variety of bearings, including those used in automobiles and machinery.
- Machine tools: Magnesium HK31A-O is used in a variety of machine tools, including milling machines, lathes, and drill presses.
- Medical devices: Magnesium HK31A-O is used in a variety of medical devices, including implants and prosthetics.
- Sporting goods: Magnesium HK31A-O is used in a variety of sporting goods, including bicycles, golf clubs, and fishing rods.