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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 106 psi

Elongation at Break

11 %

Fatigue Strength

89 MPa 13 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

17 GPa 2.5 x 106 psi

Shear Strength

120 MPa 18 x 103 psi

Tensile Strength: Ultimate (UTS)

210 MPa 30 x 103 psi

Tensile Strength: Yield (Proof)

120 MPa 17 x 103 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/cm3 100 lb/ft3

Embodied Carbon

23 kg CO2/kg material

Embodied Energy

160 MJ/kg 68 x 103 BTU/lb

Embodied Water

990 L/kg 120 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

20 MJ/m3

Resilience: Unit (Modulus of Resilience)

160 kJ/m3

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 mm2/s

Thermal Shock Resistance

12 points

Alloy Composition

Magnesium (Mg)Mg 93.5 to 95.5
Aluminum (Al)Al 4.4 to 5.5
Manganese (Mn)Mn 0.1 to 0.6
Zinc (Zn)Zn 0 to 0.3
Silicon (Si)Si 0 to 0.1
Copper (Cu)Cu 0 to 0.010
Iron (Fe)Fe 0 to 0.0050
Nickel (Ni)Ni 0 to 0.0020
Residualsres. 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