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5456 Aluminum vs. AZ81A Magnesium

5456 aluminum belongs to the aluminum alloys classification, while AZ81A 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 5456 aluminum and the bottom bar is AZ81A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
46
Elongation at Break, % 11 to 18
3.0 to 8.8
Fatigue Strength, MPa 130 to 210
78 to 80
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
18
Shear Strength, MPa 190 to 210
91 to 130
Tensile Strength: Ultimate (UTS), MPa 320 to 340
160 to 240
Tensile Strength: Yield (Proof), MPa 150 to 250
84

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 570
500
Specific Heat Capacity, J/kg-K 900
990
Thermal Conductivity, W/m-K 120
84
Thermal Expansion, µm/m-K 24
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 29
12
Electrical Conductivity: Equal Weight (Specific), % IACS 97
65

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
12
Density, g/cm3 2.7
1.7
Embodied Carbon, kg CO2/kg material 9.0
23
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 1170
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 33 to 46
4.0 to 17
Resilience: Unit (Modulus of Resilience), kJ/m3 170 to 470
77 to 78
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 50
70
Strength to Weight: Axial, points 33 to 35
26 to 39
Strength to Weight: Bending, points 38 to 40
38 to 50
Thermal Diffusivity, mm2/s 48
50
Thermal Shock Resistance, points 14 to 15
9.1 to 14

Alloy Composition


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Aluminum (Al), % 92 to 94.8
7.0 to 8.1
Chromium (Cr), % 0.050 to 0.2
0
Copper (Cu), % 0 to 0.1
0 to 0.1
Iron (Fe), % 0 to 0.4
0
Magnesium (Mg), % 4.7 to 5.5
89.8 to 92.5
Manganese (Mn), % 0.5 to 1.0
0.13 to 0.35
Nickel (Ni), % 0
0 to 0.010
Silicon (Si), % 0 to 0.25
0 to 0.3
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 0 to 0.25
0.4 to 1.0
Residuals, % 0 to 0.15
0 to 0.3