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5251 Aluminum vs. ISO-WD21150 Magnesium

5251 aluminum belongs to the aluminum alloys classification, while ISO-WD21150 magnesium belongs to the magnesium alloys. There are 29 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 5251 aluminum and the bottom bar is ISO-WD21150 magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
45
Elongation at Break, % 2.0 to 19
5.7 to 11
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
17
Shear Strength, MPa 110 to 160
150 to 170
Tensile Strength: Ultimate (UTS), MPa 180 to 280
240 to 290
Tensile Strength: Yield (Proof), MPa 67 to 250
120 to 200

Thermal Properties

Latent Heat of Fusion, J/g 400
350
Maximum Temperature: Mechanical, °C 180
110
Melting Completion (Liquidus), °C 650
600
Melting Onset (Solidus), °C 610
550
Specific Heat Capacity, J/kg-K 900
990
Thermal Conductivity, W/m-K 150
100
Thermal Expansion, µm/m-K 24
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
19
Electrical Conductivity: Equal Weight (Specific), % IACS 120
100

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
23
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 1180
980

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.4 to 27
15 to 24
Resilience: Unit (Modulus of Resilience), kJ/m3 33 to 450
160 to 460
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 50
70
Strength to Weight: Axial, points 18 to 29
40 to 48
Strength to Weight: Bending, points 26 to 35
52 to 58
Thermal Diffusivity, mm2/s 61
60
Thermal Shock Resistance, points 7.9 to 13
15 to 17

Alloy Composition

Aluminum (Al), % 95.5 to 98.2
2.4 to 3.6
Chromium (Cr), % 0 to 0.15
0
Copper (Cu), % 0 to 0.15
0 to 0.050
Iron (Fe), % 0 to 0.5
0 to 0.0050
Magnesium (Mg), % 1.7 to 2.4
94 to 97
Manganese (Mn), % 0.1 to 0.5
0.15 to 0.4
Nickel (Ni), % 0
0 to 0.0050
Silicon (Si), % 0 to 0.4
0 to 0.1
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.15
0.5 to 1.5
Residuals, % 0
0 to 0.3

Comparable Variants