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2218 Aluminum vs. ZE41A Magnesium

2218 aluminum belongs to the aluminum alloys classification, while ZE41A magnesium belongs to the magnesium alloys. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is 2218 aluminum and the bottom bar is ZE41A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 95 to 110
63
Elastic (Young's, Tensile) Modulus, GPa 73
45
Elongation at Break, % 6.8 to 10
3.3
Fatigue Strength, MPa 110
98
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
18
Shear Strength, MPa 210 to 250
150
Tensile Strength: Ultimate (UTS), MPa 330 to 430
210
Tensile Strength: Yield (Proof), MPa 260 to 310
140

Thermal Properties

Latent Heat of Fusion, J/g 390
330
Maximum Temperature: Mechanical, °C 220
150
Melting Completion (Liquidus), °C 640
640
Melting Onset (Solidus), °C 510
540
Specific Heat Capacity, J/kg-K 870
970
Thermal Conductivity, W/m-K 140
110
Thermal Expansion, µm/m-K 22
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
27
Electrical Conductivity: Equal Weight (Specific), % IACS 110
130

Otherwise Unclassified Properties

Base Metal Price, % relative 11
18
Density, g/cm3 3.1
1.9
Embodied Carbon, kg CO2/kg material 8.2
24
Embodied Energy, MJ/kg 150
170
Embodied Water, L/kg 1130
940

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27 to 31
6.1
Resilience: Unit (Modulus of Resilience), kJ/m3 450 to 650
220
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
63
Strength to Weight: Axial, points 30 to 39
31
Strength to Weight: Bending, points 34 to 41
41
Thermal Diffusivity, mm2/s 52
59
Thermal Shock Resistance, points 15 to 19
12

Alloy Composition

Aluminum (Al), % 88.8 to 93.6
0
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 3.5 to 4.5
0 to 0.1
Iron (Fe), % 0 to 1.0
0
Magnesium (Mg), % 1.2 to 1.8
91.7 to 95.4
Manganese (Mn), % 0 to 0.2
0 to 0.15
Nickel (Ni), % 1.7 to 2.3
0 to 0.010
Silicon (Si), % 0 to 0.9
0
Unspecified Rare Earths, % 0
0.75 to 1.8
Zinc (Zn), % 0 to 0.25
3.5 to 5.0
Zirconium (Zr), % 0
0.4 to 1.0
Residuals, % 0
0 to 0.3