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5657 Aluminum vs. AZ91A Magnesium

5657 aluminum belongs to the aluminum alloys classification, while AZ91A magnesium belongs to the magnesium alloys. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is 5657 aluminum and the bottom bar is AZ91A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 40 to 50
63
Elastic (Young's, Tensile) Modulus, GPa 68
46
Elongation at Break, % 6.6 to 15
5.0
Fatigue Strength, MPa 74 to 88
99
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
18
Shear Strength, MPa 92 to 110
140
Tensile Strength: Ultimate (UTS), MPa 150 to 200
240
Tensile Strength: Yield (Proof), MPa 140 to 170
160

Thermal Properties

Latent Heat of Fusion, J/g 400
360
Maximum Temperature: Mechanical, °C 180
130
Melting Completion (Liquidus), °C 660
600
Melting Onset (Solidus), °C 640
470
Specific Heat Capacity, J/kg-K 900
990
Thermal Conductivity, W/m-K 210
73
Thermal Expansion, µm/m-K 24
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 54
10
Electrical Conductivity: Equal Weight (Specific), % IACS 180
52

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
12
Density, g/cm3 2.7
1.7
Embodied Carbon, kg CO2/kg material 8.4
22
Embodied Energy, MJ/kg 160
160
Embodied Water, L/kg 1200
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 9.7 to 27
11
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 200
280
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 50
69
Strength to Weight: Axial, points 15 to 20
38
Strength to Weight: Bending, points 23 to 28
49
Thermal Diffusivity, mm2/s 84
42
Thermal Shock Resistance, points 6.7 to 8.6
14

Alloy Composition

Aluminum (Al), % 98.5 to 99.4
8.3 to 9.7
Copper (Cu), % 0 to 0.1
0 to 0.1
Gallium (Ga), % 0 to 0.030
0
Iron (Fe), % 0 to 0.1
0
Magnesium (Mg), % 0.6 to 1.0
88.2 to 91.2
Manganese (Mn), % 0 to 0.030
0.13 to 0.5
Nickel (Ni), % 0
0 to 0.030
Silicon (Si), % 0 to 0.080
0 to 0.5
Vanadium (V), % 0 to 0.050
0
Zinc (Zn), % 0 to 0.050
0.35 to 1.0
Residuals, % 0 to 0.050
0