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5251 Aluminum vs. QE22A Magnesium

5251 aluminum belongs to the aluminum alloys classification, while QE22A magnesium belongs to the magnesium alloys. There are 29 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is 5251 aluminum and the bottom bar is QE22A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 44 to 79
80
Elastic (Young's, Tensile) Modulus, GPa 68
44
Elongation at Break, % 2.0 to 19
2.4
Fatigue Strength, MPa 59 to 110
110
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
17
Shear Strength, MPa 110 to 160
150
Tensile Strength: Ultimate (UTS), MPa 180 to 280
250
Tensile Strength: Yield (Proof), MPa 67 to 250
190

Thermal Properties

Latent Heat of Fusion, J/g 400
340
Maximum Temperature: Mechanical, °C 180
250
Melting Completion (Liquidus), °C 650
640
Melting Onset (Solidus), °C 610
570
Specific Heat Capacity, J/kg-K 900
970
Thermal Conductivity, W/m-K 150
110
Thermal Expansion, µm/m-K 24
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
25
Electrical Conductivity: Equal Weight (Specific), % IACS 120
120

Otherwise Unclassified Properties

Density, g/cm3 2.7
2.0
Embodied Carbon, kg CO2/kg material 8.5
27
Embodied Energy, MJ/kg 150
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.4 to 27
5.5
Resilience: Unit (Modulus of Resilience), kJ/m3 33 to 450
400
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
60
Strength to Weight: Axial, points 18 to 29
36
Strength to Weight: Bending, points 26 to 35
46
Thermal Diffusivity, mm2/s 61
59
Thermal Shock Resistance, points 7.9 to 13
15

Alloy Composition

Aluminum (Al), % 95.5 to 98.2
0
Chromium (Cr), % 0 to 0.15
0
Copper (Cu), % 0 to 0.15
0 to 0.1
Iron (Fe), % 0 to 0.5
0
Magnesium (Mg), % 1.7 to 2.4
93.1 to 95.8
Manganese (Mn), % 0.1 to 0.5
0
Nickel (Ni), % 0
0 to 0.010
Silicon (Si), % 0 to 0.4
0
Silver (Ag), % 0
2.0 to 3.0
Titanium (Ti), % 0 to 0.15
0
Unspecified Rare Earths, % 0
1.8 to 2.5
Zinc (Zn), % 0 to 0.15
0
Zirconium (Zr), % 0
0.4 to 1.0
Residuals, % 0
0 to 0.3