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5059 Aluminum vs. AZ81A Magnesium

5059 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 5059 aluminum and the bottom bar is AZ81A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
46
Elongation at Break, % 11 to 25
3.0 to 8.8
Fatigue Strength, MPa 170 to 240
78 to 80
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
18
Shear Strength, MPa 220 to 250
91 to 130
Tensile Strength: Ultimate (UTS), MPa 350 to 410
160 to 240
Tensile Strength: Yield (Proof), MPa 170 to 300
84

Thermal Properties

Latent Heat of Fusion, J/g 390
350
Maximum Temperature: Mechanical, °C 210
130
Melting Completion (Liquidus), °C 650
600
Melting Onset (Solidus), °C 510
500
Specific Heat Capacity, J/kg-K 900
990
Thermal Conductivity, W/m-K 110
84
Thermal Expansion, µm/m-K 24
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 29
12
Electrical Conductivity: Equal Weight (Specific), % IACS 95
65

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
12
Density, g/cm3 2.7
1.7
Embodied Carbon, kg CO2/kg material 9.1
23
Embodied Energy, MJ/kg 160
160
Embodied Water, L/kg 1160
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 42 to 75
4.0 to 17
Resilience: Unit (Modulus of Resilience), kJ/m3 220 to 650
77 to 78
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 50
70
Strength to Weight: Axial, points 36 to 42
26 to 39
Strength to Weight: Bending, points 41 to 45
38 to 50
Thermal Diffusivity, mm2/s 44
50
Thermal Shock Resistance, points 16 to 18
9.1 to 14

Alloy Composition

Aluminum (Al), % 89.9 to 94
7.0 to 8.1
Chromium (Cr), % 0 to 0.25
0
Copper (Cu), % 0 to 0.25
0 to 0.1
Iron (Fe), % 0 to 0.5
0
Magnesium (Mg), % 5.0 to 6.0
89.8 to 92.5
Manganese (Mn), % 0.6 to 1.2
0.13 to 0.35
Nickel (Ni), % 0
0 to 0.010
Silicon (Si), % 0 to 0.45
0 to 0.3
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 0.4 to 0.9
0.4 to 1.0
Zirconium (Zr), % 0.050 to 0.25
0
Residuals, % 0
0 to 0.3