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WE43A (M18430) Magnesium

WE43A magnesium is a magnesium alloy. WE43A is the ASTM designation for this material. M18430 is the UNS number. Additionally, the ISO numeric designation is WD95360.

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

The properties of WE43A 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 WE43A 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

5.2 to 5.4 %

Fatigue Strength

85 to 120 MPa 12 to 17 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

17 GPa 2.5 x 106 psi

Shear Strength

160 MPa 23 x 103 psi

Tensile Strength: Ultimate (UTS)

250 to 270 MPa 36 to 39 x 103 psi

Tensile Strength: Yield (Proof)

160 to 170 MPa 23 to 24 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)

570 °C 1050 °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

12 % IACS

Electrical Conductivity: Equal Weight (Specific)

55 % 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)

12 MJ/m3

Resilience: Unit (Modulus of Resilience)

280 to 310 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

61 points

Strength to Weight: Axial

36 to 39 points

Strength to Weight: Bending

46 to 48 points

Thermal Diffusivity

28 mm2/s

Thermal Shock Resistance

15 to 16 points

Alloy Composition

Magnesium (Mg) 89.5 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 0.15
Copper (Cu) 0 to 0.030
Silicon (Si) 0 to 0.010
Iron (Fe) 0 to 0.010
Nickel (Ni) 0 to 0.0050
Unspecified Rare Earths 2.4 to 4.4
Residuals 0 to 0.3

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

ISO 3116: Magnesium and magnesium alloys - Wrought magnesium alloys

ASTM B80: Standard Specification for Magnesium-Alloy Sand Castings

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.

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