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AZ91B Magnesium vs. 2024 Aluminum

AZ91B magnesium belongs to the magnesium alloys classification, while 2024 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is AZ91B magnesium and the bottom bar is 2024 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
71
Elongation at Break, % 5.0
4.0 to 16
Fatigue Strength, MPa 79
90 to 180
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 18
27
Shear Strength, MPa 140
130 to 320
Tensile Strength: Ultimate (UTS), MPa 240
200 to 540
Tensile Strength: Yield (Proof), MPa 160
100 to 490

Thermal Properties

Latent Heat of Fusion, J/g 360
390
Maximum Temperature: Mechanical, °C 130
200
Melting Completion (Liquidus), °C 600
640
Melting Onset (Solidus), °C 470
500
Specific Heat Capacity, J/kg-K 990
880
Thermal Conductivity, W/m-K 73
120
Thermal Expansion, µm/m-K 26
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
30
Electrical Conductivity: Equal Weight (Specific), % IACS 58
90

Otherwise Unclassified Properties

Base Metal Price, % relative 12
11
Density, g/cm3 1.7
3.0
Embodied Carbon, kg CO2/kg material 22
8.3
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 990
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
20 to 68
Resilience: Unit (Modulus of Resilience), kJ/m3 280
70 to 1680
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
46
Strength to Weight: Axial, points 38
18 to 50
Strength to Weight: Bending, points 49
25 to 49
Thermal Diffusivity, mm2/s 42
46
Thermal Shock Resistance, points 14
8.6 to 24

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
90.7 to 94.7
Chromium (Cr), % 0
0 to 0.1
Copper (Cu), % 0 to 0.35
3.8 to 4.9
Iron (Fe), % 0
0 to 0.5
Magnesium (Mg), % 87.9 to 91.2
1.2 to 1.8
Manganese (Mn), % 0.13 to 0.5
0.3 to 0.9
Nickel (Ni), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
0 to 0.5
Titanium (Ti), % 0
0 to 0.15
Zinc (Zn), % 0.35 to 1.0
0 to 0.25
Zirconium (Zr), % 0
0 to 0.2
Residuals, % 0
0 to 0.15