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ISO-WD32250 (MgZn3Zr) Magnesium

ISO-WD32250 magnesium is a magnesium alloy. WD32250 is the ISO numeric designation for this material. Additionally, the British Standard (BS) designation is MAG 151.

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

The properties of ISO-WD32250 magnesium include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare ISO-WD32250 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

4.5 to 8.6 %

Fatigue Strength

170 to 210 MPa 25 to 31 x 103 psi

Poisson's Ratio


Shear Modulus

17 GPa 2.5 x 106 psi

Shear Strength

180 to 190 MPa 26 to 28 x 103 psi

Tensile Strength: Ultimate (UTS)

310 to 330 MPa 45 to 47 x 103 psi

Tensile Strength: Yield (Proof)

240 to 290 MPa 35 to 42 x 103 psi

Thermal Properties

Latent Heat of Fusion

340 J/g

Maximum Temperature: Mechanical

120 °C 240 °F

Melting Completion (Liquidus)

600 °C 1110 °F

Melting Onset (Solidus)

550 °C 1030 °F

Specific Heat Capacity

980 J/kg-K 0.23 BTU/lb-°F

Thermal Conductivity

130 W/m-K 72 BTU/h-ft-°F

Thermal Expansion

26 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

25 % IACS

Electrical Conductivity: Equal Weight (Specific)

130 % IACS

Otherwise Unclassified Properties

Base Metal Price

13 % relative


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)

14 to 26 MJ/m3

Resilience: Unit (Modulus of Resilience)

630 to 930 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

67 points

Strength to Weight: Axial

49 to 51 points

Strength to Weight: Bending

58 to 60 points

Thermal Diffusivity

72 mm2/s

Thermal Shock Resistance

19 to 20 points

Alloy Composition

Magnesium (Mg)Mg 94.9 to 97.1
Zinc (Zn)Zn 2.5 to 4.0
Zirconium (Zr)Zr 0.45 to 0.8
Residualsres. 0 to 0.3

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

Followup Questions

Similar Alloys

Further Reading

ISO 3116: Magnesium and magnesium alloys - Wrought magnesium alloys

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