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2018 Aluminum vs. EQ21A Magnesium

2018 aluminum belongs to the aluminum alloys classification, while EQ21A magnesium belongs to the magnesium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is 2018 aluminum and the bottom bar is EQ21A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 120
80
Elastic (Young's, Tensile) Modulus, GPa 73
44
Elongation at Break, % 9.6
2.4
Fatigue Strength, MPa 120
110
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
17
Shear Strength, MPa 270
150
Tensile Strength: Ultimate (UTS), MPa 420
250
Tensile Strength: Yield (Proof), MPa 310
190

Thermal Properties

Latent Heat of Fusion, J/g 390
340
Maximum Temperature: Mechanical, °C 220
160
Melting Completion (Liquidus), °C 640
640
Melting Onset (Solidus), °C 510
560
Specific Heat Capacity, J/kg-K 870
980
Thermal Conductivity, W/m-K 150
110
Thermal Expansion, µm/m-K 22
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
25
Electrical Conductivity: Equal Weight (Specific), % IACS 120
120

Otherwise Unclassified Properties

Base Metal Price, % relative 11
80
Density, g/cm3 3.1
1.9
Embodied Carbon, kg CO2/kg material 8.1
27
Embodied Energy, MJ/kg 150
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37
5.6
Resilience: Unit (Modulus of Resilience), kJ/m3 670
410
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
63
Strength to Weight: Axial, points 38
37
Strength to Weight: Bending, points 41
47
Thermal Diffusivity, mm2/s 57
62
Thermal Shock Resistance, points 19
15

Alloy Composition

Aluminum (Al), % 89.7 to 94.4
0
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 3.5 to 4.5
0.050 to 0.1
Iron (Fe), % 0 to 1.0
0
Magnesium (Mg), % 0.45 to 0.9
93.9 to 96.8
Manganese (Mn), % 0 to 0.2
0
Nickel (Ni), % 1.7 to 2.3
0 to 0.010
Silicon (Si), % 0 to 0.9
0
Silver (Ag), % 0
1.3 to 1.7
Unspecified Rare Earths, % 0
1.5 to 3.0
Zinc (Zn), % 0 to 0.25
0
Zirconium (Zr), % 0
0.4 to 1.0
Residuals, % 0
0 to 0.3