HM21A
UNS M13210
Description
Magnesium alloy HM21A is a Mg-2Th-1Mn alloy with high strength, toughness, harness and good corrosion resistance. Specifically, magnesium HM21A-T5 is used for both cast and forged components; magnesium HM21A-T8 alloy is one of the most widely used precipitation hardening grades with the characteristics of soft and ductile under solution annealed condition; Magnesium HM21A-T81 alloy is developed for use at elevated temperatures.
General Information
| Items | HM21A-T5 | HM21A-T8 | HM21A-T81 |
|---|---|---|---|
| Catalog | ACAM-Mg-A008 | ACAM-Mg-A009 | ACAM-Mg-A010 |
| Density | 1.78 g/cm3 | 1.78 g/cm3 | 1.78 g/cm3 |
| Thermal Expansion Co-efficient (@ 0-100°C) | 26.8 µm/m°C | 26.8 µm/m°C | 26.8 µm/m°C |
| Thermal Conductivity | 135 W/mK | 135 W/mK | 135 W/mK |
Chemical Component
| Mg | Th | Mn |
|---|---|---|
| 97.0 min | 1.5-2.5 | 0.45-1.1 |
* Unit: %
Typical Mechanical Properties
| Items | HM21A-T5 | HM21A-T8 | HM21A-T81 |
|---|---|---|---|
| Tensile Strength, Ultimate | 230 MPa | 235 MPa | 225 MPa |
| Tensile Strength,Yield | 150 MPa | 150 MPa | 210 MPa |
| Elongation at Break | 9.0% | 11% | 6.00% |
| Tensile Modulus | 45.0 GPa | 45.0 GPa | 45.0 GPa |
| Compressive Yield Strength | 110 MPa | 130 MPa | 180 MPa |
| Notched Tensile Strength | 230 MPa | 230 MPa | 260 MPa |
| Ultimate Bearing Strength | 250 MPa | 415 MPa | 455 MPa |
| Bearing Yield Strength | 160 MPa | -- | 320 MPa |
| Poissons Ratio | 0.35 | 0.35 | 0.35 |
| Machinability | 100% | 100% | 100% |
| Shear Modulus | 17.0 GPa | 17.0 GPa | 17.0 GPa |
| Shear Strength | 125 MPa | 125 MPa | 170 MPa |
| Creep Strength | -- | 34.0 MPa | -- |
| Modulus of Elasticity | -- | 34.0 GPa | -- |
Material Forms
Applications
HM21A is a magnesium alloy sheet, plate, and forging material developed for high temperature service as in aircraft and missile applications.
* Technical data included herein should be used as a guideline only, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice.
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