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WE43B (WE43B-T6, M18432) Magnesium

WE43B magnesium is a magnesium alloy. It is typically furnished in 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 moderately high density.

The graph bars on the material properties cards below compare WE43B magnesium to other magnesium alloys (top) and the entire database (bottom).

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

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

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