# AM100A-T4 Magnesium

AM100A-T4 magnesium is AM100A magnesium in the T4 temper. To achieve this temper, the metal is solution heat-treated and naturally aged. It has the highest ductility compared to the other variants of AM100A magnesium. The graph bars on the material properties cards below compare AM100A-T4 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

46 *GPa* 6.7 *x 10 ^{6} psi*

Elongation at Break

6.8 *%*

Fatigue Strength

55 *MPa* 8.0 *x 10 ^{3} psi*

Poisson's Ratio

0.29

Shear Modulus

18 *GPa* 2.6 *x 10 ^{6} psi*

Shear Strength

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

Tensile Strength: Ultimate (UTS)

260 *MPa* 38 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

78 *MPa* 11 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

350 *J/g*

Maximum Temperature: Mechanical

140 *°C* 280 *°F*

Melting Completion (Liquidus)

590 *°C* 1100 *°F*

Melting Onset (Solidus)

460 *°C* 870 *°F*

Solidification (Pattern Maker's) Shrinkage

1.3 *%*

Specific Heat Capacity

990 *J/kg-K* 0.24 *BTU/lb-°F*

Thermal Conductivity

73 *W/m-K* 42 *BTU/h-ft-°F*

Thermal Expansion

25 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

11 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

59 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

12 *% relative*

Density

1.7 *g/cm ^{3}* 110

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

160 *MJ/kg* 68 *x 10 ^{3} BTU/lb*

Embodied Water

1000 *L/kg* 120 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

14 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

66 *kJ/m ^{3}*

Stiffness to Weight: Axial

15 *points*

Stiffness to Weight: Bending

70 *points*

Strength to Weight: Axial

43 *points*

Strength to Weight: Bending

53 *points*

Thermal Diffusivity

43 *mm ^{2}/s*

Thermal Shock Resistance

16 *points*

## Alloy Composition

Mg | 87.9 to 90.6 | |

Al | 9.3 to 10.7 | |

Mn | 0.1 to 0.35 | |

Si | 0 to 0.3 | |

Zn | 0 to 0.3 | |

Cu | 0 to 0.1 | |

Ni | 0 to 0.010 | |

res. | 0 to 0.3 |

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

## Followup Questions

## Further Reading

ASTM B199: Standard Specification for Magnesium-Alloy Permanent Mold Castings

ASTM B403: Standard Specification for Magnesium-Alloy Investment Castings

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

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