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EQ21A Magnesium vs. 2018 Aluminum

EQ21A magnesium belongs to the magnesium alloys classification, while 2018 aluminum belongs to the aluminum 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 EQ21A magnesium and the bottom bar is 2018 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

Aluminum (Al), % 0
89.7 to 94.4
Chromium (Cr), % 0
0 to 0.1
Copper (Cu), % 0.050 to 0.1
3.5 to 4.5
Iron (Fe), % 0
0 to 1.0
Magnesium (Mg), % 93.9 to 96.8
0.45 to 0.9
Manganese (Mn), % 0
0 to 0.2
Nickel (Ni), % 0 to 0.010
1.7 to 2.3
Silicon (Si), % 0
0 to 0.9
Silver (Ag), % 1.3 to 1.7
0
Unspecified Rare Earths, % 1.5 to 3.0
0
Zinc (Zn), % 0
0 to 0.25
Zirconium (Zr), % 0.4 to 1.0
0
Residuals, % 0 to 0.3
0 to 0.15