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5251 Aluminum vs. AZ91D Magnesium

5251 aluminum belongs to the aluminum alloys classification, while AZ91D magnesium belongs to the magnesium alloys. There are 31 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 5251 aluminum and the bottom bar is AZ91D magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 44 to 79
60 to 80
Elastic (Young's, Tensile) Modulus, GPa 68
46
Elongation at Break, % 2.0 to 19
2.3 to 4.5
Fatigue Strength, MPa 59 to 110
74 to 85
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
18
Shear Strength, MPa 110 to 160
120 to 140
Tensile Strength: Ultimate (UTS), MPa 180 to 280
160 to 220
Tensile Strength: Yield (Proof), MPa 67 to 250
80 to 130

Thermal Properties

Latent Heat of Fusion, J/g 400
350
Maximum Temperature: Mechanical, °C 180
130
Melting Completion (Liquidus), °C 650
600
Melting Onset (Solidus), °C 610
490
Specific Heat Capacity, J/kg-K 900
990
Thermal Conductivity, W/m-K 150
78
Thermal Expansion, µm/m-K 24
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
11
Electrical Conductivity: Equal Weight (Specific), % IACS 120
58

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
12
Density, g/cm3 2.7
1.7
Embodied Carbon, kg CO2/kg material 8.5
22
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 1180
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.4 to 27
4.2 to 7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 33 to 450
69 to 170
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 50
69
Strength to Weight: Axial, points 18 to 29
26 to 34
Strength to Weight: Bending, points 26 to 35
38 to 46
Thermal Diffusivity, mm2/s 61
45
Thermal Shock Resistance, points 7.9 to 13
9.5 to 13

Alloy Composition

Aluminum (Al), % 95.5 to 98.2
8.3 to 9.7
Chromium (Cr), % 0 to 0.15
0
Copper (Cu), % 0 to 0.15
0 to 0.030
Iron (Fe), % 0 to 0.5
0 to 0.0050
Magnesium (Mg), % 1.7 to 2.4
88.7 to 91.2
Manganese (Mn), % 0.1 to 0.5
0.15 to 0.5
Nickel (Ni), % 0
0 to 0.0020
Silicon (Si), % 0 to 0.4
0 to 0.1
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.15
0.35 to 1.0
Residuals, % 0 to 0.15
0

Comparable Variants