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EN-MC21120 Magnesium vs. 7020 Aluminum

EN-MC21120 magnesium belongs to the magnesium alloys classification, while 7020 aluminum belongs to the aluminum alloys.

For each property being compared, the top bar is EN-MC21120 magnesium and the bottom bar is 7020 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63 to 75
45 to 100
Elastic (Young's, Tensile) Modulus, GPa 46
70
Elongation at Break, % 2.2 to 6.7
8.4 to 14
Fatigue Strength, MPa 84 to 96
110 to 130
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 18
26
Shear Strength, MPa 110 to 160
110 to 230
Tensile Strength: Ultimate (UTS), MPa 200 to 270
190 to 390
Tensile Strength: Yield (Proof), MPa 130 to 170
120 to 310

Thermal Properties

Latent Heat of Fusion, J/g 350
380
Maximum Temperature: Mechanical, °C 130
210
Melting Completion (Liquidus), °C 600
650
Melting Onset (Solidus), °C 490
610
Specific Heat Capacity, J/kg-K 990
880
Thermal Conductivity, W/m-K 76
150
Thermal Expansion, µm/m-K 26
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
39
Electrical Conductivity: Equal Weight (Specific), % IACS 59
120

Otherwise Unclassified Properties

Base Metal Price, % relative 12
9.5
Density, g/cm3 1.7
2.9
Embodied Carbon, kg CO2/kg material 22
8.3
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 990
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.0 to 15
23 to 46
Resilience: Unit (Modulus of Resilience), kJ/m3 180 to 320
110 to 690
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
47
Strength to Weight: Axial, points 31 to 43
18 to 37
Strength to Weight: Bending, points 43 to 53
25 to 41
Thermal Diffusivity, mm2/s 44
59
Thermal Shock Resistance, points 11 to 16
8.3 to 17

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
91.2 to 94.8
Chromium (Cr), % 0
0.1 to 0.35
Copper (Cu), % 0 to 0.030
0 to 0.2
Iron (Fe), % 0 to 0.0050
0 to 0.4
Magnesium (Mg), % 88.6 to 91.3
1.0 to 1.4
Manganese (Mn), % 0.1 to 0.5
0.050 to 0.5
Nickel (Ni), % 0 to 0.0020
0
Silicon (Si), % 0 to 0.2
0 to 0.35
Titanium (Ti), % 0
0 to 0.25
Zinc (Zn), % 0.35 to 1.0
4.0 to 5.0
Zirconium (Zr), % 0
0.080 to 0.25
Residuals, % 0 to 0.010
0 to 0.15

Comparable Variants