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ZK40A (ZK40A-T5, M16400) Magnesium

ZK40A magnesium is a magnesium alloy. Cited properties are appropriate for the T5 temper. To achieve this temper, the metal is artificially aged until it meets standard mechanical property requirements. ZK40A is the ASTM designation for this material. M16400 is the UNS number.

It has a moderately high base cost among magnesium alloys. In addition, it has a fairly high electrical conductivity and a moderately high thermal conductivity.

The graph bars on the material properties cards below compare ZK40A magnesium to other magnesium alloys (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

45 GPa 6.5 x 106 psi

Elongation at Break

4.2 %

Fatigue Strength

190 MPa 28 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

17 GPa 2.5 x 106 psi

Shear Strength

160 MPa 24 x 103 psi

Tensile Strength: Ultimate (UTS)

280 MPa 41 x 103 psi

Tensile Strength: Yield (Proof)

260 MPa 38 x 103 psi

Thermal Properties

Latent Heat of Fusion

340 J/g

Maximum Temperature: Mechanical

120 °C 250 °F

Melting Completion (Liquidus)

600 °C 1110 °F

Melting Onset (Solidus)

540 °C 1010 °F

Specific Heat Capacity

970 J/kg-K 0.23 BTU/lb-°F

Thermal Conductivity

110 W/m-K 64 BTU/h-ft-°F

Thermal Expansion

26 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

27 % IACS

Electrical Conductivity: Equal Weight (Specific)

130 % IACS

Otherwise Unclassified Properties

Base Metal Price

13 % relative

Density

1.8 g/cm3 110 lb/ft3

Embodied Carbon

24 kg CO2/kg material

Embodied Energy

160 MJ/kg 71 x 103 BTU/lb

Embodied Water

950 L/kg 110 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

12 MJ/m3

Resilience: Unit (Modulus of Resilience)

740 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

65 points

Strength to Weight: Axial

43 points

Strength to Weight: Bending

53 points

Thermal Diffusivity

62 m2/s

Thermal Shock Resistance

17 points

Alloy Composition

Magnesium (Mg) 94.2 to 96.1
Zinc (Zn) 3.5 to 4.5
Zirconium (Zr) 0.45 to 1.0
Residuals 0 to 0.3

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

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

Essential Readings in Magnesium Technology, Suveen N. Mathaudhu et al. (editors), 2014

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015