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AZ91B Magnesium vs. 6081 Aluminum

AZ91B magnesium belongs to the magnesium alloys classification, while 6081 aluminum belongs to the aluminum alloys. There are 30 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 AZ91B magnesium and the bottom bar is 6081 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
69
Elongation at Break, % 5.0
9.0
Fatigue Strength, MPa 79
110
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 18
26
Shear Strength, MPa 140
180
Tensile Strength: Ultimate (UTS), MPa 240
310
Tensile Strength: Yield (Proof), MPa 160
270

Thermal Properties

Latent Heat of Fusion, J/g 360
410
Maximum Temperature: Mechanical, °C 130
160
Melting Completion (Liquidus), °C 600
640
Melting Onset (Solidus), °C 470
610
Specific Heat Capacity, J/kg-K 990
900
Thermal Conductivity, W/m-K 73
180
Thermal Expansion, µm/m-K 26
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
47
Electrical Conductivity: Equal Weight (Specific), % IACS 58
160

Otherwise Unclassified Properties

Base Metal Price, % relative 12
9.5
Density, g/cm3 1.7
2.7
Embodied Carbon, kg CO2/kg material 22
8.3
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 990
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
27
Resilience: Unit (Modulus of Resilience), kJ/m3 280
540
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
50
Strength to Weight: Axial, points 38
32
Strength to Weight: Bending, points 49
37
Thermal Diffusivity, mm2/s 42
74
Thermal Shock Resistance, points 14
14

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
96.3 to 98.6
Chromium (Cr), % 0
0 to 0.1
Copper (Cu), % 0 to 0.35
0 to 0.1
Iron (Fe), % 0
0 to 0.5
Magnesium (Mg), % 87.9 to 91.2
0.6 to 1.0
Manganese (Mn), % 0.13 to 0.5
0.1 to 0.45
Nickel (Ni), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
0.7 to 1.1
Titanium (Ti), % 0
0 to 0.15
Zinc (Zn), % 0.35 to 1.0
0 to 0.2
Residuals, % 0
0 to 0.15