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6018 Aluminum vs. AZ31C Magnesium

6018 aluminum belongs to the aluminum alloys classification, while AZ31C magnesium belongs to the magnesium alloys.

For each property being compared, the top bar is 6018 aluminum and the bottom bar is AZ31C magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
45
Elongation at Break, % 9.0 to 9.1
12
Fatigue Strength, MPa 85 to 89
150
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
17
Shear Strength, MPa 170 to 180
130
Tensile Strength: Ultimate (UTS), MPa 290 to 300
260
Tensile Strength: Yield (Proof), MPa 220 to 230
200

Thermal Properties

Latent Heat of Fusion, J/g 400
350
Maximum Temperature: Mechanical, °C 160
110
Melting Completion (Liquidus), °C 640
600
Melting Onset (Solidus), °C 570
550
Specific Heat Capacity, J/kg-K 890
990
Thermal Conductivity, W/m-K 170
130
Thermal Expansion, µm/m-K 23
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 44
19
Electrical Conductivity: Equal Weight (Specific), % IACS 140
98

Otherwise Unclassified Properties

Base Metal Price, % relative 10
12
Density, g/cm3 2.9
1.7
Embodied Carbon, kg CO2/kg material 8.2
23
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 1180
970

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 25
28
Resilience: Unit (Modulus of Resilience), kJ/m3 360 to 380
440
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 48
70
Strength to Weight: Axial, points 28 to 29
42
Strength to Weight: Bending, points 34 to 35
53
Thermal Diffusivity, mm2/s 65
74
Thermal Shock Resistance, points 13
16

Alloy Composition

Aluminum (Al), % 93.1 to 97.8
2.4 to 3.6
Bismuth (Bi), % 0.4 to 0.7
0
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 0.15 to 0.4
0 to 0.1
Iron (Fe), % 0 to 0.7
0
Lead (Pb), % 0.4 to 1.2
0
Magnesium (Mg), % 0.6 to 1.2
93.4 to 97
Manganese (Mn), % 0.3 to 0.8
0.15 to 1.0
Nickel (Ni), % 0
0 to 0.030
Silicon (Si), % 0.5 to 1.2
0 to 0.1
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 0 to 0.3
0.5 to 1.5
Residuals, % 0
0 to 0.3