# EN-MC21320 (MgAl4Si) Magnesium

EN-MC21320 magnesium is a magnesium alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. MC21320 is the EN numeric designation for this material. MgAl4Si is the EN chemical designation. Additionally, the AFNOR (French) designation is G-A4S1.

It has a very low density among magnesium alloys. In addition, it has a moderately low thermal conductivity and a moderately high ductility.

The graph bars on the material properties cards below compare EN-MC21320 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

68

Elastic (Young's, Tensile) Modulus

45 *GPa* 6.6 *x 10 ^{6} psi*

Elongation at Break

7.5 *%*

Fatigue Strength

95 *MPa* 14 *x 10 ^{3} psi*

Poisson's Ratio

0.29

Shear Modulus

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

Shear Strength

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

Tensile Strength: Ultimate (UTS)

230 *MPa* 33 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

140 *MPa* 20 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

370 *J/g*

Maximum Temperature: Mechanical

110 *°C* 230 *°F*

Melting Completion (Liquidus)

600 *°C* 1110 *°F*

Melting Onset (Solidus)

530 *°C* 990 *°F*

Specific Heat Capacity

1000 *J/kg-K* 0.24 *BTU/lb-°F*

Thermal Conductivity

66 *W/m-K* 38 *BTU/h-ft-°F*

Thermal Expansion

26 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

17 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

91 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

12 *% relative*

Density

1.6 *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

980 *L/kg* 120 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

15 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

200 *kJ/m ^{3}*

Stiffness to Weight: Axial

15 *points*

Stiffness to Weight: Bending

72 *points*

Strength to Weight: Axial

38 *points*

Strength to Weight: Bending

50 *points*

Thermal Diffusivity

40 *mm ^{2}/s*

Thermal Shock Resistance

13 *points*

## Alloy Composition

Mg | 92.5 to 95.9 | |

Al | 3.5 to 5.0 | |

Si | 0.5 to 1.5 | |

Mn | 0.1 to 0.7 | |

Zn | 0 to 0.2 | |

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