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5070 Aluminum vs. AZ91D Magnesium

5070 aluminum belongs to the aluminum alloys classification, while AZ91D magnesium belongs to the magnesium 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 5070 aluminum and the bottom bar is AZ91D magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
46
Elongation at Break, % 20
2.3 to 4.5
Fatigue Strength, MPa 150
74 to 85
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
18
Shear Strength, MPa 190
120 to 140
Tensile Strength: Ultimate (UTS), MPa 300
160 to 220
Tensile Strength: Yield (Proof), MPa 140
80 to 130

Thermal Properties

Latent Heat of Fusion, J/g 390
350
Maximum Temperature: Mechanical, °C 190
130
Melting Completion (Liquidus), °C 640
600
Melting Onset (Solidus), °C 550
490
Specific Heat Capacity, J/kg-K 900
990
Thermal Conductivity, W/m-K 130
78
Thermal Expansion, µm/m-K 24
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
11
Electrical Conductivity: Equal Weight (Specific), % IACS 100
58

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
12
Density, g/cm3 2.7
1.7
Embodied Carbon, kg CO2/kg material 8.8
22
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 1170
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 51
4.2 to 7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 150
69 to 170
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 50
69
Strength to Weight: Axial, points 31
26 to 34
Strength to Weight: Bending, points 37
38 to 46
Thermal Diffusivity, mm2/s 53
45
Thermal Shock Resistance, points 14
9.5 to 13

Alloy Composition

Aluminum (Al), % 92.4 to 95.7
8.3 to 9.7
Chromium (Cr), % 0 to 0.3
0
Copper (Cu), % 0 to 0.25
0 to 0.030
Iron (Fe), % 0 to 0.4
0 to 0.0050
Magnesium (Mg), % 3.5 to 4.5
88.7 to 91.2
Manganese (Mn), % 0.4 to 0.8
0.15 to 0.5
Nickel (Ni), % 0
0 to 0.0020
Silicon (Si), % 0 to 0.25
0 to 0.1
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0.4 to 0.8
0.35 to 1.0
Residuals, % 0 to 0.15
0