HM21A-T81
Material Data Sheet
Magnesium HM21A-T81 alloy developed for use at elevated temperatures. It is commonly available in sheet and plate forms.
The following datasheet gives an overview of magnesium HM21A-T81 alloy.
Chemical Composition
| Element | Content (%) |
|---|---|
| Magnesium, Mg | 97.0 |
| Zinc, Zn | 1 – 2.5 |
| Zirconium, Zr | 0.45 – 1.1 |
Physical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Density | 1.78 g/cc | 0.0643 lb/in³ |
Mechanical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Tensile Strength, Ultimate | 225 MPa | 37000 psi |
| Tensile Strength,Yield | 210 MPa | 30500 psi |
| Elongation at Break | 6.0% | 6.0% |
| Tensile Modulus | 45.0 GPa | 6530 ksi |
| Compressive Yield Strength | 180 MPa | 26100 psi |
| Notched Tensile Strength | 260 MPa | 37700 psi |
| Ultimate Bearing Strength | 455 MPa | 6600 psi |
| Bearing Yield Strength | 320 MPa | 46400 psi |
| Poissons Ratio | 0.35 | 0.35 |
| Machinability | 100% | 100% | Shear Modulus | 17.0 GPa | 2470 ksi |
| Shear Strength | 170 MPa | 24700 psi |
Applications
Magnesium HM21A-T81 alloy is used in a number of missile and satellite programs, including Polaris, Agena and Titan.
