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2218 Aluminum vs. QE22A Magnesium

2218 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 2218 aluminum and the bottom bar is QE22A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 95 to 110
80
Elastic (Young's, Tensile) Modulus, GPa 73
44
Elongation at Break, % 6.8 to 10
2.4
Fatigue Strength, MPa 110
110
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
17
Shear Strength, MPa 210 to 250
150
Tensile Strength: Ultimate (UTS), MPa 330 to 430
250
Tensile Strength: Yield (Proof), MPa 260 to 310
190

Thermal Properties

Latent Heat of Fusion, J/g 390
340
Maximum Temperature: Mechanical, °C 220
250
Melting Completion (Liquidus), °C 640
640
Melting Onset (Solidus), °C 510
570
Specific Heat Capacity, J/kg-K 870
970
Thermal Conductivity, W/m-K 140
110
Thermal Expansion, µm/m-K 22
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
25
Electrical Conductivity: Equal Weight (Specific), % IACS 110
120

Otherwise Unclassified Properties

Density, g/cm3 3.1
2.0
Embodied Carbon, kg CO2/kg material 8.2
27
Embodied Energy, MJ/kg 150
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27 to 31
5.5
Resilience: Unit (Modulus of Resilience), kJ/m3 450 to 650
400
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
60
Strength to Weight: Axial, points 30 to 39
36
Strength to Weight: Bending, points 34 to 41
46
Thermal Diffusivity, mm2/s 52
59
Thermal Shock Resistance, points 15 to 19
15

Alloy Composition

Aluminum (Al), % 88.8 to 93.6
0
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 3.5 to 4.5
0 to 0.1
Iron (Fe), % 0 to 1.0
0
Magnesium (Mg), % 1.2 to 1.8
93.1 to 95.8
Manganese (Mn), % 0 to 0.2
0
Nickel (Ni), % 1.7 to 2.3
0 to 0.010
Silicon (Si), % 0 to 0.9
0
Silver (Ag), % 0
2.0 to 3.0
Unspecified Rare Earths, % 0
1.8 to 2.5
Zinc (Zn), % 0 to 0.25
0
Zirconium (Zr), % 0
0.4 to 1.0
Residuals, % 0
0 to 0.3