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 mm2/s
Thermal Shock Resistance
11 to 16 points
Alloy Composition
| Mg | 88.6 to 91.3 | |
| Al | 8.3 to 9.7 | |
| Zn | 0.35 to 1.0 | |
| Mn | 0.1 to 0.5 | |
| Si | 0 to 0.2 | |
| Cu | 0 to 0.030 | |
| 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