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AZ91A Magnesium vs. 2018 Aluminum

AZ91A magnesium belongs to the magnesium alloys classification, while 2018 aluminum belongs to the aluminum 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 AZ91A magnesium and the bottom bar is 2018 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
120
Elastic (Young's, Tensile) Modulus, GPa 46
73
Elongation at Break, % 5.0
9.6
Fatigue Strength, MPa 99
120
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 18
27
Shear Strength, MPa 140
270
Tensile Strength: Ultimate (UTS), MPa 240
420
Tensile Strength: Yield (Proof), MPa 160
310

Thermal Properties

Latent Heat of Fusion, J/g 360
390
Maximum Temperature: Mechanical, °C 130
220
Melting Completion (Liquidus), °C 600
640
Melting Onset (Solidus), °C 470
510
Specific Heat Capacity, J/kg-K 990
870
Thermal Conductivity, W/m-K 73
150
Thermal Expansion, µm/m-K 26
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
40
Electrical Conductivity: Equal Weight (Specific), % IACS 52
120

Otherwise Unclassified Properties

Base Metal Price, % relative 12
11
Density, g/cm3 1.7
3.1
Embodied Carbon, kg CO2/kg material 22
8.1
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 990
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
37
Resilience: Unit (Modulus of Resilience), kJ/m3 280
670
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
45
Strength to Weight: Axial, points 38
38
Strength to Weight: Bending, points 49
41
Thermal Diffusivity, mm2/s 42
57
Thermal Shock Resistance, points 14
19

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
89.7 to 94.4
Chromium (Cr), % 0
0 to 0.1
Copper (Cu), % 0 to 0.1
3.5 to 4.5
Iron (Fe), % 0
0 to 1.0
Magnesium (Mg), % 88.2 to 91.2
0.45 to 0.9
Manganese (Mn), % 0.13 to 0.5
0 to 0.2
Nickel (Ni), % 0 to 0.030
1.7 to 2.3
Silicon (Si), % 0 to 0.5
0 to 0.9
Zinc (Zn), % 0.35 to 1.0
0 to 0.25
Residuals, % 0
0 to 0.15