# EN-MC21220 (MgAl5Mn) Magnesium

EN-MC21220 magnesium is a magnesium alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. MC21220 is the EN numeric designation for this material. MgAl5Mn is the EN chemical designation.

It has a fairly high ductility among magnesium alloys. In addition, it has a moderately low thermal conductivity and a moderately low tensile strength.

The graph bars on the material properties cards below compare EN-MC21220 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

58

Elastic (Young's, Tensile) Modulus

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

Elongation at Break

11 *%*

Fatigue Strength

89 *MPa* 13 *x 10 ^{3} psi*

Poisson's Ratio

0.29

Shear Modulus

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

Shear Strength

120 *MPa* 18 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

210 *MPa* 30 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

120 *MPa* 17 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

350 *J/g*

Maximum Temperature: Mechanical

120 *°C* 240 *°F*

Melting Completion (Liquidus)

600 *°C* 1120 *°F*

Melting Onset (Solidus)

540 *°C* 1000 *°F*

Specific Heat Capacity

1000 *J/kg-K* 0.24 *BTU/lb-°F*

Thermal Conductivity

65 *W/m-K* 38 *BTU/h-ft-°F*

Thermal Expansion

27 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

16 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

87 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

12 *% relative*

Density

1.7 *g/cm ^{3}* 100

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

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

Embodied Water

990 *L/kg* 120 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

20 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

160 *kJ/m ^{3}*

Stiffness to Weight: Axial

15 *points*

Stiffness to Weight: Bending

71 *points*

Strength to Weight: Axial

34 *points*

Strength to Weight: Bending

46 *points*

Thermal Diffusivity

39 *mm ^{2}/s*

Thermal Shock Resistance

12 *points*

## Alloy Composition

Mg | 93.5 to 95.5 | |

Al | 4.4 to 5.5 | |

Mn | 0.1 to 0.6 | |

Zn | 0 to 0.3 | |

Si | 0 to 0.1 | |

Cu | 0 to 0.010 | |

Fe | 0 to 0.0050 | |

Ni | 0 to 0.0020 | |

res. | 0 to 0.010 |

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

## Followup Questions

## Similar Alloys

## Further Reading

ISO 16220: Magnesium and magnesium alloys - Magnesium alloy ingots and castings

EN 1753: Magnesium and magnesium alloys. Magnesium alloy ingots and castings

Essential Readings in Magnesium Technology, Suveen N. Mathaudhu et al. (editors), 2014