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AZ91B Magnesium vs. 2618A Aluminum

AZ91B magnesium belongs to the magnesium alloys classification, while 2618A 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 2618A aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
72
Elongation at Break, % 5.0
4.5
Fatigue Strength, MPa 79
120
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 18
27
Shear Strength, MPa 140
260
Tensile Strength: Ultimate (UTS), MPa 240
440
Tensile Strength: Yield (Proof), MPa 160
410

Thermal Properties

Latent Heat of Fusion, J/g 360
390
Maximum Temperature: Mechanical, °C 130
230
Melting Completion (Liquidus), °C 600
670
Melting Onset (Solidus), °C 470
560
Specific Heat Capacity, J/kg-K 990
880
Thermal Conductivity, W/m-K 73
150
Thermal Expansion, µm/m-K 26
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
37
Electrical Conductivity: Equal Weight (Specific), % IACS 58
110

Otherwise Unclassified Properties

Base Metal Price, % relative 12
11
Density, g/cm3 1.7
3.0
Embodied Carbon, kg CO2/kg material 22
8.4
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 990
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
19
Resilience: Unit (Modulus of Resilience), kJ/m3 280
1180
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
47
Strength to Weight: Axial, points 38
41
Strength to Weight: Bending, points 49
44
Thermal Diffusivity, mm2/s 42
59
Thermal Shock Resistance, points 14
19

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
91.5 to 95.2
Copper (Cu), % 0 to 0.35
1.8 to 2.7
Iron (Fe), % 0
0.9 to 1.4
Magnesium (Mg), % 87.9 to 91.2
1.2 to 1.8
Manganese (Mn), % 0.13 to 0.5
0 to 0.25
Nickel (Ni), % 0 to 0.030
0.8 to 1.4
Silicon (Si), % 0 to 0.5
0.15 to 0.25
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0.35 to 1.0
0 to 0.15
Zirconium (Zr), % 0
0 to 0.25
Residuals, % 0
0 to 0.15