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EN-MC21120 (MgAl9Zn1(A)) Magnesium

EN-MC21120 magnesium is a magnesium alloy. MC21120 is the EN numeric designation for this material. MgAl9Zn1(A) is the EN chemical designation. Additionally, the British Standard (BS) designation is MAG 7. And the AFNOR (French) designation is G-A9Z1.

It has a moderately low electrical conductivity and a moderately low melting temperature among magnesium alloys.

The properties of EN-MC21120 magnesium include three common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare EN-MC21120 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

63 to 75

Elastic (Young's, Tensile) Modulus

46 GPa 6.7 x 106 psi

Elongation at Break

2.2 to 6.7 %

Fatigue Strength

84 to 96 MPa 12 to 14 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

18 GPa 2.6 x 106 psi

Shear Strength

110 to 160 MPa 16 to 23 x 103 psi

Tensile Strength: Ultimate (UTS)

200 to 270 MPa 28 to 39 x 103 psi

Tensile Strength: Yield (Proof)

130 to 170 MPa 19 to 25 x 103 psi

Thermal Properties

Latent Heat of Fusion

350 J/g

Maximum Temperature: Mechanical

130 °C 270 °F

Melting Completion (Liquidus)

600 °C 1120 °F

Melting Onset (Solidus)

490 °C 910 °F

Specific Heat Capacity

990 J/kg-K 0.24 BTU/lb-°F

Thermal Conductivity

76 W/m-K 44 BTU/h-ft-°F

Thermal Expansion

26 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/cm3 110 lb/ft3

Embodied Carbon

22 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)

5.0 to 15 MJ/m3

Resilience: Unit (Modulus of Resilience)

180 to 320 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

69 points

Strength to Weight: Axial

31 to 43 points

Strength to Weight: Bending

43 to 53 points

Thermal Diffusivity

44 m2/s

Thermal Shock Resistance

11 to 16 points

Alloy Composition

Magnesium (Mg) 88.6 to 91.3
Aluminum (Al) 8.3 to 9.7
Zinc (Zn) 0.35 to 1.0
Manganese (Mn) 0.1 to 0.5
Silicon (Si) 0 to 0.2
Copper (Cu) 0 to 0.030
Iron (Fe) 0 to 0.0050
Nickel (Ni) 0 to 0.0020
Residuals 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