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EN-MC21120 Magnesium vs. 5251 Aluminum

EN-MC21120 magnesium belongs to the magnesium alloys classification, while 5251 aluminum belongs to the aluminum alloys.

For each property being compared, the top bar is EN-MC21120 magnesium and the bottom bar is 5251 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63 to 75
44 to 79
Elastic (Young's, Tensile) Modulus, GPa 46
68
Elongation at Break, % 2.2 to 6.7
2.0 to 19
Fatigue Strength, MPa 84 to 96
59 to 110
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 18
26
Shear Strength, MPa 110 to 160
110 to 160
Tensile Strength: Ultimate (UTS), MPa 200 to 270
180 to 280
Tensile Strength: Yield (Proof), MPa 130 to 170
67 to 250

Thermal Properties

Latent Heat of Fusion, J/g 350
400
Maximum Temperature: Mechanical, °C 130
180
Melting Completion (Liquidus), °C 600
650
Melting Onset (Solidus), °C 490
610
Specific Heat Capacity, J/kg-K 990
900
Thermal Conductivity, W/m-K 76
150
Thermal Expansion, µm/m-K 26
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
37
Electrical Conductivity: Equal Weight (Specific), % IACS 59
120

Otherwise Unclassified Properties

Base Metal Price, % relative 12
9.5
Density, g/cm3 1.7
2.7
Embodied Carbon, kg CO2/kg material 22
8.5
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 990
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.0 to 15
5.4 to 27
Resilience: Unit (Modulus of Resilience), kJ/m3 180 to 320
33 to 450
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
50
Strength to Weight: Axial, points 31 to 43
18 to 29
Strength to Weight: Bending, points 43 to 53
26 to 35
Thermal Diffusivity, mm2/s 44
61
Thermal Shock Resistance, points 11 to 16
7.9 to 13

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
95.5 to 98.2
Chromium (Cr), % 0
0 to 0.15
Copper (Cu), % 0 to 0.030
0 to 0.15
Iron (Fe), % 0 to 0.0050
0 to 0.5
Magnesium (Mg), % 88.6 to 91.3
1.7 to 2.4
Manganese (Mn), % 0.1 to 0.5
0.1 to 0.5
Nickel (Ni), % 0 to 0.0020
0
Silicon (Si), % 0 to 0.2
0 to 0.4
Titanium (Ti), % 0
0 to 0.15
Zinc (Zn), % 0.35 to 1.0
0 to 0.15
Residuals, % 0 to 0.010
0 to 0.15

Comparable Variants