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.

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