# AZ31B-H24 Magnesium

AZ31B-H24 magnesium is AZ31B magnesium in the H24 temper. To achieve this temper, the metal is strain hardened, and then partially annealed, to a strength that is roughly halfway between annealed (O) and full-hard (H28). The graph bars on the material properties cards below compare AZ31B-H24 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

Brinell Hardness

73

Elastic (Young's, Tensile) Modulus

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

Elongation at Break

8.3 *%*

Fatigue Strength

100 *MPa* 15 *x 10 ^{3} psi*

Fracture Toughness

28 *MPa-m ^{1/2}* 25

*x 10*

^{3}psi-in^{1/2}Poisson's Ratio

0.29

Shear Modulus

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

Shear Strength

160 *MPa* 23 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

270 *MPa* 39 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

180 *MPa* 26 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

350 *J/g*

Maximum Temperature: Mechanical

150 *°C* 300 *°F*

Melting Completion (Liquidus)

600 *°C* 1110 *°F*

Melting Onset (Solidus)

600 *°C* 1120 *°F*

Specific Heat Capacity

990 *J/kg-K* 0.24 *BTU/lb-°F*

Thermal Conductivity

100 *W/m-K* 60 *BTU/h-ft-°F*

Thermal Expansion

26 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

18 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

95 *% 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)

20 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

370 *kJ/m ^{3}*

Stiffness to Weight: Axial

15 *points*

Stiffness to Weight: Bending

70 *points*

Strength to Weight: Axial

44 *points*

Strength to Weight: Bending

55 *points*

Thermal Diffusivity

62 *mm ^{2}/s*

Thermal Shock Resistance

16 *points*

## Alloy Composition

Mg | 93.6 to 97.1 | |

Al | 2.4 to 3.6 | |

Zn | 0.5 to 1.5 | |

Mn | 0.050 to 1.0 | |

Si | 0 to 0.1 | |

Fe | 0 to 0.050 | |

Cu | 0 to 0.050 | |

Ca | 0 to 0.040 | |

Ni | 0 to 0.0050 | |

res. | 0 to 0.3 |

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

## Followup Questions

## Further Reading

ASTM B90: Standard Specification for Magnesium-Alloy Sheet and Plate

Advances in Wrought Magnesium Alloys: Fundamentals of Processing, Properties and Applications, Colleen Bettles and Matthew Barnett (editors), 2012

ASTM B91: Standard Specification for Magnesium-Alloy Forgings

ISO 3116: Magnesium and magnesium alloys - Wrought magnesium alloys

Welding and Joining of Magnesium Alloys, Liming Liu (editor), 2010

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.

Advanced Materials in Automotive Engineering, Jason Rowe (editor), 2012

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