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WE43B (WE43B-T6, M18432) Magnesium

WE43B magnesium is a magnesium alloy. Cited properties are appropriate for the T6 temper. To achieve this temper, the metal is solution heat-treated and artificially aged until it meets standard mechanical property requirements. WE43B is the ASTM designation for this material. M18432 is the UNS number.

It has a fairly high base cost among magnesium alloys. In addition, it has a very low thermal conductivity and a very low ductility.

The graph bars on the material properties cards below compare WE43B 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

44 GPa 6.4 x 106 psi

Elongation at Break

2.2 %

Fatigue Strength

110 MPa 16 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

17 GPa 2.5 x 106 psi

Shear Strength

140 MPa 21 x 103 psi

Tensile Strength: Ultimate (UTS)

250 MPa 36 x 103 psi

Tensile Strength: Yield (Proof)

200 MPa 28 x 103 psi

Thermal Properties

Latent Heat of Fusion

330 J/g

Maximum Temperature: Mechanical

180 °C 360 °F

Melting Completion (Liquidus)

640 °C 1180 °F

Melting Onset (Solidus)

550 °C 1010 °F

Solidification (Pattern Maker's) Shrinkage

1.6 %

Specific Heat Capacity

960 J/kg-K 0.23 BTU/lb-°F

Thermal Conductivity

51 W/m-K 29 BTU/h-ft-°F

Thermal Expansion

27 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

11 % IACS

Electrical Conductivity: Equal Weight (Specific)

53 % IACS

Otherwise Unclassified Properties

Base Metal Price

34 % relative

Density

1.9 g/cm3 120 lb/ft3

Embodied Carbon

28 kg CO2/kg material

Embodied Energy

250 MJ/kg 110 x 103 BTU/lb

Embodied Water

910 L/kg 110 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

5.2 MJ/m3

Resilience: Unit (Modulus of Resilience)

430 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

61 points

Strength to Weight: Axial

36 points

Strength to Weight: Bending

46 points

Thermal Diffusivity

28 m2/s

Thermal Shock Resistance

15 points

Alloy Composition

Magnesium (Mg) 89.8 to 93.5
Yttrium (Y) 3.7 to 4.3
Zirconium (Zr) 0.4 to 1.0
Zinc (Zn) 0 to 0.2
Lithium (Li) 0 to 0.2
Manganese (Mn) 0 to 0.030
Copper (Cu) 0 to 0.020
Iron (Fe) 0 to 0.010
Nickel (Ni) 0 to 0.0050
Unspecified Rare Earths 2.4 to 4.4

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

Followup Questions

Similar Alloys

Further Reading

Magnesium Alloys Containing Rare Earth Metals: Structure and Properties, L.L. Rokhlin, 2003

ASTM B80: Standard Specification for Magnesium-Alloy Sand Castings

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

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