# AZ31C (AZ31C-F, M11312) Magnesium

AZ31C magnesium is a magnesium alloy. It is typically furnished in the as-fabricated (no temper or treatment) condition. AZ31C is the ASTM designation for this material. M11312 is the UNS number. It has a fairly high ductility and a very high thermal conductivity relative to other magnesium alloys. The graph bars on the material properties cards below compare AZ31C magnesium to other magnesium alloys (top) and the entire database (bottom).

## Mechanical Properties

Elastic (Young's, Tensile) Modulus

45 *GPa* 6.5 *x 10 ^{6} psi*

Elongation at Break

12 *%*

Fatigue Strength

150 *MPa* 22 *x 10 ^{3} psi*

Poisson's Ratio

0.29

Shear Modulus

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

Shear Strength

130 *MPa* 19 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

260 *MPa* 37 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

200 *MPa* 29 *x 10 ^{3} psi*

## Thermal Properties

Melting Completion (Liquidus)

600 *°C* 1120 *°F*

Melting Onset (Solidus)

540 *°C* 1010 *°F*

Specific Heat Capacity

990 *J/kg-K* 0.24 *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

19 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

98 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

12 *% relative*

Density

1.7 *g/cm ^{3}* 110

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

160 *MJ/kg* 67 *x 10 ^{3} BTU/lb*

Embodied Water

970 *L/kg* 120 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

28 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

440 *kJ/m ^{3}*

Stiffness to Weight: Axial

15 *points*

Stiffness to Weight: Bending

70 *points*

Strength to Weight: Axial

42 *points*

Strength to Weight: Bending

53 *points*

Thermal Diffusivity

74 *m ^{2}/s*

Thermal Shock Resistance

16 *points*

## Alloy Composition

Mg | 93.4 to 97 | |

Al | 2.4 to 3.6 | |

Zn | 0.5 to 1.5 | |

Mn | 0.15 to 1.0 | |

Si | 0 to 0.1 | |

Cu | 0 to 0.1 | |

Ni | 0 to 0.030 | |

res. | 0 to 0.3 |

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

## Followup Questions

## Similar Alloys

## Further Reading

ASTM B107: Standard Specification for Magnesium-Alloy Extruded Bars, Rods, Profiles, Tubes, and Wire

Environmental Degradation of Advanced and Traditional Engineering Materials, Lloyd H. Hihara et al., 2014.

Welding and Joining of Magnesium Alloys, Liming Liu ed., 2010