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 106 psi
Elongation at Break
7.5 %
Fatigue Strength
95 MPa 14 x 103 psi
Poisson's Ratio
0.29
Shear Modulus
18 GPa 2.5 x 106 psi
Shear Strength
130 MPa 19 x 103 psi
Tensile Strength: Ultimate (UTS)
230 MPa 33 x 103 psi
Tensile Strength: Yield (Proof)
140 MPa 20 x 103 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/cm3 100 lb/ft3
Embodied Carbon
23 kg CO2/kg material
Embodied Energy
160 MJ/kg 68 x 103 BTU/lb
Embodied Water
980 L/kg 120 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
15 MJ/m3
Resilience: Unit (Modulus of Resilience)
200 kJ/m3
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 mm2/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