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AZ91E Magnesium vs. 5449 Aluminum

AZ91E magnesium belongs to the magnesium alloys classification, while 5449 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is AZ91E magnesium and the bottom bar is 5449 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
69
Elongation at Break, % 2.5 to 6.2
4.0 to 17
Fatigue Strength, MPa 81 to 85
78 to 120
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 18
26
Shear Strength, MPa 89 to 150
130 to 190
Tensile Strength: Ultimate (UTS), MPa 160 to 260
210 to 330
Tensile Strength: Yield (Proof), MPa 96 to 130
91 to 260

Thermal Properties

Latent Heat of Fusion, J/g 350
400
Maximum Temperature: Mechanical, °C 130
190
Melting Completion (Liquidus), °C 600
650
Melting Onset (Solidus), °C 500
590
Specific Heat Capacity, J/kg-K 990
900
Thermal Conductivity, W/m-K 84
140
Thermal Expansion, µm/m-K 27
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10 to 12
35
Electrical Conductivity: Equal Weight (Specific), % IACS 52 to 60
110

Otherwise Unclassified Properties

Base Metal Price, % relative 12
9.5
Density, g/cm3 1.7
2.8
Embodied Carbon, kg CO2/kg material 22
8.5
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 990
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.4 to 12
12 to 29
Resilience: Unit (Modulus of Resilience), kJ/m3 100 to 190
60 to 480
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
50
Strength to Weight: Axial, points 25 to 42
22 to 33
Strength to Weight: Bending, points 37 to 53
29 to 39
Thermal Diffusivity, mm2/s 49
56
Thermal Shock Resistance, points 9.0 to 15
9.4 to 15

Alloy Composition

Aluminum (Al), % 8.1 to 9.3
94.1 to 97.8
Chromium (Cr), % 0
0 to 0.3
Copper (Cu), % 0 to 0.015
0 to 0.3
Iron (Fe), % 0 to 0.0050
0 to 0.7
Magnesium (Mg), % 88.8 to 91.3
1.6 to 2.6
Manganese (Mn), % 0.17 to 0.35
0.6 to 1.1
Nickel (Ni), % 0 to 0.0010
0
Silicon (Si), % 0 to 0.2
0 to 0.4
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 0.4 to 1.0
0 to 0.3
Residuals, % 0
0 to 0.15