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2018 Aluminum vs. AZ31C Magnesium

2018 aluminum belongs to the aluminum alloys classification, while AZ31C magnesium belongs to the magnesium 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 2018 aluminum and the bottom bar is AZ31C magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
45
Elongation at Break, % 9.6
12
Fatigue Strength, MPa 120
150
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
17
Shear Strength, MPa 270
130
Tensile Strength: Ultimate (UTS), MPa 420
260
Tensile Strength: Yield (Proof), MPa 310
200

Thermal Properties

Latent Heat of Fusion, J/g 390
350
Maximum Temperature: Mechanical, °C 220
110
Melting Completion (Liquidus), °C 640
600
Melting Onset (Solidus), °C 510
550
Specific Heat Capacity, J/kg-K 870
990
Thermal Conductivity, W/m-K 150
130
Thermal Expansion, µm/m-K 22
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
19
Electrical Conductivity: Equal Weight (Specific), % IACS 120
98

Otherwise Unclassified Properties

Base Metal Price, % relative 11
12
Density, g/cm3 3.1
1.7
Embodied Carbon, kg CO2/kg material 8.1
23
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 1130
970

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37
28
Resilience: Unit (Modulus of Resilience), kJ/m3 670
440
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 45
70
Strength to Weight: Axial, points 38
42
Strength to Weight: Bending, points 41
53
Thermal Diffusivity, mm2/s 57
74
Thermal Shock Resistance, points 19
16

Alloy Composition

Aluminum (Al), % 89.7 to 94.4
2.4 to 3.6
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), % 0.45 to 0.9
93.4 to 97
Manganese (Mn), % 0 to 0.2
0.15 to 1.0
Nickel (Ni), % 1.7 to 2.3
0 to 0.030
Silicon (Si), % 0 to 0.9
0 to 0.1
Zinc (Zn), % 0 to 0.25
0.5 to 1.5
Residuals, % 0
0 to 0.3