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ZK60A (MgZn6Zr, M16600) Magnesium

ZK60A magnesium is a magnesium alloy. ZK60A is the ASTM designation for this material. MgZn6Zr is the EN chemical designation. And M16600 is the UNS number.

It can have a fairly high tensile strength among magnesium alloys. In addition, it has a fairly high thermal conductivity and can have a moderately high electrical conductivity.

The properties of ZK60A magnesium include three common variations. The property values on this page show ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare ZK60A magnesium to other magnesium alloys (top) and the entire database (bottom).

Mechanical Properties

Elastic (Young's, Tensile) Modulus

46 GPa 6.6 x 106 psi

Elongation at Break

4.5 to 9.9 %

Fatigue Strength

150 to 180 MPa 21 to 26 x 103 psi

Poisson's Ratio


Shear Modulus

18 GPa 2.6 x 106 psi

Shear Strength

170 to 190 MPa 25 to 28 x 103 psi

Tensile Strength: Ultimate (UTS)

320 to 330 MPa 46 to 48 x 103 psi

Tensile Strength: Yield (Proof)

230 to 250 MPa 33 to 37 x 103 psi

Thermal Properties

Melting Completion (Liquidus)

600 °C 1110 °F

Melting Onset (Solidus)

550 °C 1020 °F

Specific Heat Capacity

960 J/kg-K 0.23 BTU/lb-°F

Thermal Conductivity

120 W/m-K 69 BTU/h-ft-°F

Thermal Expansion

26 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

29 to 30 % IACS

Electrical Conductivity: Equal Weight (Specific)

140 % IACS

Otherwise Unclassified Properties

Base Metal Price

13 % relative


1.9 g/cm3 120 lb/ft3

Embodied Carbon

23 kg CO2/kg material

Embodied Energy

160 MJ/kg 70 x 103 BTU/lb

Embodied Water

940 L/kg 110 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

14 to 29 MJ/m3

Resilience: Unit (Modulus of Resilience)

570 to 690 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

63 points

Strength to Weight: Axial

47 to 49 points

Strength to Weight: Bending

55 to 56 points

Thermal Diffusivity

66 m2/s

Thermal Shock Resistance

19 to 20 points

Alloy Composition

Magnesium (Mg) 92.5 to 94.8
Zinc (Zn) 4.8 to 6.2
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 B91: Standard Specification for Magnesium-Alloy Forgings

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.

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993