ZK40A (ZK40A-T5, M16400) Magnesium

ZK40A magnesium is an alloy of magnesium. It is typically furnished in the T5 temper. ZK40A is the ASTM designation for this material. M16400 is the UNS number.

Material Properties

Base Metal Price22 % rel

Density2.0 g/cm3 (120 lb/ft3)

Elastic (Young's, Tensile) Modulus48 GPa (7.0 x 106 psi)

Elongation at Break4.3 %

Modulus of Resilience (Unit Resilience)700 kJ/m3

Poisson's Ratio0.29

Specific Heat Capacity970 J/kg-K

Strength to Weight Ratio140 kN-m/kg

Tensile Strength: Ultimate (UTS)280 MPa (41 x 103 psi)

Tensile Strength: Yield (Proof)260 MPa (38 x 103 psi)

Thermal Expansion25 µm/m-K

Unit Rupture Work (Ultimate Resilience)12 MJ/m3

The length of each bar compares the given value to the highest value in the database.

Alloy Composition

Magnesium (Mg)94.2 to 96.1 %

Zinc (Zn)3.5 to 4.5 %

Zirconium (Zr)0.45 to 1.0 %

Residuals0 to 0.3 %

Further Reading

ASTM B107: Standard Specification for Magnesium-Alloy Extruded Bars, Rods, Profiles, Tubes, and Wire

Environmental Degradation of Advanced and Traditional Engineering Materials, Lloyd H. Hihara et al., 2014.