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AZ91B Magnesium vs. 2017 Aluminum

AZ91B magnesium belongs to the magnesium alloys classification, while 2017 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is AZ91B magnesium and the bottom bar is 2017 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
71
Elongation at Break, % 5.0
12 to 18
Fatigue Strength, MPa 79
90 to 130
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 18
27
Shear Strength, MPa 140
130 to 260
Tensile Strength: Ultimate (UTS), MPa 240
190 to 430
Tensile Strength: Yield (Proof), MPa 160
76 to 260

Thermal Properties

Latent Heat of Fusion, J/g 360
390
Maximum Temperature: Mechanical, °C 130
190
Melting Completion (Liquidus), °C 600
640
Melting Onset (Solidus), °C 470
510
Specific Heat Capacity, J/kg-K 990
880
Thermal Conductivity, W/m-K 73
150
Thermal Expansion, µm/m-K 26
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
38
Electrical Conductivity: Equal Weight (Specific), % IACS 58
110

Otherwise Unclassified Properties

Base Metal Price, % relative 12
10
Density, g/cm3 1.7
3.0
Embodied Carbon, kg CO2/kg material 22
8.0
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 990
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
24 to 66
Resilience: Unit (Modulus of Resilience), kJ/m3 280
41 to 470
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
46
Strength to Weight: Axial, points 38
17 to 40
Strength to Weight: Bending, points 49
24 to 42
Thermal Diffusivity, mm2/s 42
56
Thermal Shock Resistance, points 14
7.9 to 18

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
91.6 to 95.5
Chromium (Cr), % 0
0 to 0.1
Copper (Cu), % 0 to 0.35
3.5 to 4.5
Iron (Fe), % 0
0 to 0.7
Magnesium (Mg), % 87.9 to 91.2
0.4 to 0.8
Manganese (Mn), % 0.13 to 0.5
0.4 to 1.0
Nickel (Ni), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
0.2 to 0.8
Titanium (Ti), % 0
0 to 0.15
Zinc (Zn), % 0.35 to 1.0
0 to 0.25
Residuals, % 0
0 to 0.15