# 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 10 ^{6} psi*

Elongation at Break

2.2 *%*

Fatigue Strength

110 *MPa* 16 *x 10 ^{3} psi*

Poisson's Ratio

0.29

Shear Modulus

17 *GPa* 2.5 *x 10 ^{6} psi*

Shear Strength

140 *MPa* 21 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

250 *MPa* 36 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

200 *MPa* 28 *x 10 ^{3} 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/cm ^{3}* 120

*lb/ft*

^{3}Embodied Carbon

28 *kg CO _{2}/kg material*

Embodied Energy

250 *MJ/kg* 110 *x 10 ^{3} BTU/lb*

Embodied Water

910 *L/kg* 110 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

5.2 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

430 *kJ/m ^{3}*

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 *m ^{2}/s*

Thermal Shock Resistance

15 *points*

## Alloy Composition

Mg | 89.8 to 93.5 | |

Y | 3.7 to 4.3 | |

Zr | 0.4 to 1.0 | |

Zn | 0 to 0.2 | |

Li | 0 to 0.2 | |

Mn | 0 to 0.030 | |

Cu | 0 to 0.020 | |

Fe | 0 to 0.010 | |

Ni | 0 to 0.0050 | |

rare e. | 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