Magnesium HM21A-T81 (UNS M13210)
HM21A-T81 is a precipitation-hardened magnesium alloy prized for its exceptional strength, toughness, and corrosion resistance. Its unique properties make it an ideal choice in demanding aerospace and engineering environments, where performance and durability are critical.
Looking to buy magnesium?
Check pricing and availability through our trusted partner:
| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Magnesium | —— | Remainder |
| Manganese | 0.45% | 1.1% |
| Thorium | 1.5% | 2.5% |
The following table provides a list of magnesium HM21A-T81 properties in both SI and US customary/Imperial units.
Click on the button to switch between Metric and Imperial units.
| Physical Properties | Metric |
|---|---|
| Density | 1780 kg/m3 |
| Mechanical Properties | Metric |
| Tensile Strength (Ultimate) | 255 MPa |
| Tensile Strength (Yield) | 210 MPa |
| Compressive Strength (Yield) | 180 MPa |
| Bearing Strength (Ultimate) | 455 MPa |
| Bearing Strength (Yield) | 320 MPa |
| Shear Strength | 170 MPa |
| Young’s Modulus (E) | 45 GPa |
| Shear Modulus (G) | 17 GPa |
| Elongation at Break in 50 mm | 6% |
| Poisson’s Ratio (ν) | 0.35 |
| Machinability | 100% |
| Thermal Properties | Metric |
| Melting Point | 605 - 650 °C |
| Solidus | 605 °C |
| Liquidus | 650 °C |
| Specific Heat Capacity (Cp) | 1000 J/kg·K |
| Coefficient of Thermal Expansion (αL) | 26.8 1/°C |
| Heat of Fusion | 343 J/g |
| Electrical Properties | Metric |
| Electrical Resistivity | 5.00×10-6 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 HM21A-T81
| Advantages | Disadvantages |
|---|---|
| High strength | High cost |
| Good toughness | Low stiffness |
| Corrosion resistance | Poor weldability |
| Elevated temperature performance | Difficult to machine |
Applications of Magnesium HM21A-T81
HM21A-T81 is a versatile magnesium alloy employed across various industries, supporting diverse functions including:
- Aerospace: Used in aircraft structures, engine components, and landing gear.
- Automotive: Applied in engine blocks, cylinder heads, and brake rotors.
- Marine: Utilized for boat hulls, decks, and railings.
- Sporting goods: Incorporated in golf clubs, tennis rackets, and bicycles.
- Machinery: Used in machine tools, robots, and conveyors.