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AZ31C Magnesium vs. 2218 Aluminum

AZ31C magnesium belongs to the magnesium alloys classification, while 2218 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is AZ31C magnesium and the bottom bar is 2218 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
73
Elongation at Break, % 12
6.8 to 10
Fatigue Strength, MPa 150
110
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 17
27
Shear Strength, MPa 130
210 to 250
Tensile Strength: Ultimate (UTS), MPa 260
330 to 430
Tensile Strength: Yield (Proof), MPa 200
260 to 310

Thermal Properties

Latent Heat of Fusion, J/g 350
390
Maximum Temperature: Mechanical, °C 110
220
Melting Completion (Liquidus), °C 600
640
Melting Onset (Solidus), °C 550
510
Specific Heat Capacity, J/kg-K 990
870
Thermal Conductivity, W/m-K 130
140
Thermal Expansion, µm/m-K 26
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 19
37
Electrical Conductivity: Equal Weight (Specific), % IACS 98
110

Otherwise Unclassified Properties

Base Metal Price, % relative 12
11
Density, g/cm3 1.7
3.1
Embodied Carbon, kg CO2/kg material 23
8.2
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 970
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 28
27 to 31
Resilience: Unit (Modulus of Resilience), kJ/m3 440
450 to 650
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 70
45
Strength to Weight: Axial, points 42
30 to 39
Strength to Weight: Bending, points 53
34 to 41
Thermal Diffusivity, mm2/s 74
52
Thermal Shock Resistance, points 16
15 to 19

Alloy Composition

Aluminum (Al), % 2.4 to 3.6
88.8 to 93.6
Chromium (Cr), % 0
0 to 0.1
Copper (Cu), % 0 to 0.1
3.5 to 4.5
Iron (Fe), % 0
0 to 1.0
Magnesium (Mg), % 93.4 to 97
1.2 to 1.8
Manganese (Mn), % 0.15 to 1.0
0 to 0.2
Nickel (Ni), % 0 to 0.030
1.7 to 2.3
Silicon (Si), % 0 to 0.1
0 to 0.9
Zinc (Zn), % 0.5 to 1.5
0 to 0.25
Residuals, % 0
0 to 0.15