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AZ91C Magnesium vs. 5251 Aluminum

AZ91C magnesium belongs to the magnesium alloys classification, while 5251 aluminum belongs to the aluminum alloys. There are 30 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 AZ91C magnesium and the bottom bar is 5251 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
68
Elongation at Break, % 2.3 to 7.9
2.0 to 19
Fatigue Strength, MPa 56 to 85
59 to 110
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 18
26
Shear Strength, MPa 96 to 160
110 to 160
Tensile Strength: Ultimate (UTS), MPa 170 to 270
180 to 280
Tensile Strength: Yield (Proof), MPa 83 to 130
67 to 250

Thermal Properties

Latent Heat of Fusion, J/g 350
400
Maximum Temperature: Mechanical, °C 130
180
Melting Completion (Liquidus), °C 600
650
Melting Onset (Solidus), °C 470
610
Specific Heat Capacity, J/kg-K 990
900
Thermal Conductivity, W/m-K 73
150
Thermal Expansion, µm/m-K 26
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.9 to 12
37
Electrical Conductivity: Equal Weight (Specific), % IACS 52 to 60
120

Otherwise Unclassified Properties

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

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.2 to 16
5.4 to 27
Resilience: Unit (Modulus of Resilience), kJ/m3 75 to 180
33 to 450
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
50
Strength to Weight: Axial, points 27 to 43
18 to 29
Strength to Weight: Bending, points 39 to 53
26 to 35
Thermal Diffusivity, mm2/s 43
61
Thermal Shock Resistance, points 9.9 to 16
7.9 to 13

Alloy Composition


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Aluminum (Al), % 8.1 to 9.3
95.5 to 98.2
Chromium (Cr), % 0
0 to 0.15
Copper (Cu), % 0 to 0.1
0 to 0.15
Iron (Fe), % 0
0 to 0.5
Magnesium (Mg), % 88.6 to 91.4
1.7 to 2.4
Manganese (Mn), % 0.13 to 0.35
0.1 to 0.5
Nickel (Ni), % 0 to 0.010
0
Silicon (Si), % 0 to 0.3
0 to 0.4
Titanium (Ti), % 0
0 to 0.15
Zinc (Zn), % 0.4 to 1.0
0 to 0.15
Residuals, % 0 to 0.3
0 to 0.15

Comparable Variants