HM21A-T81
Material Data Sheet
Magnesium HM21A-T8 alloy is one of the most widely used precipitation hardening grades. The alloy is soft and ductile under solution annealed condition. It is characterized by high strength, toughness, harness and good corrosion resistance.
Chemical Composition
| Element | Content (%) |
|---|---|
| Magnesium, Mg | 97.0 |
| Thorium, Th | 1.5 – 2.5 |
| Manganese, Mn | 0.45 – 1.1 |
Physical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Density | 1.78 g/cc | 0.0643 lb/in³ |
| Melting Point | 605 – 650 °C | 1120 – 1200 °F |
Mechanical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Tensile Strength, Ultimate | 235 MPa | 34100 psi |
| Tensile Strenth, Yield | 150 MPa | 21800 psi |
| Elongation at Break | 11% | 11% |
| Creep Strength | 34.0 MPa | 4930 psi |
| Modulus of Elasticity | 34.0 GPa | 4930 psi |
| Tensile Modulus | 45.0 GPa | 6530 ksi |
| Compressive Yield Strength | 130 MPa | 18900 psi |
| Notched Tensile Strength | 230 MPa | 33400 psi |
| Ultimate Bearing Strength | 415 MPa | 60200 psi |
| Poissons Ratio | 0.35 | 0.35 |
| Machinability | 100% | 100% |
| Shear Modulus | 17.0 GPa | 2470 ksi |
| Shear Strength | 125 MPa | 18100 psi |
