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

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