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7021 Aluminum vs. QE22A Magnesium

7021 aluminum belongs to the aluminum alloys classification, while QE22A magnesium belongs to the magnesium alloys. There are 28 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is 7021 aluminum and the bottom bar is QE22A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
44
Elongation at Break, % 9.4
2.4
Fatigue Strength, MPa 150
110
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 26
17
Shear Strength, MPa 270
150
Tensile Strength: Ultimate (UTS), MPa 460
250
Tensile Strength: Yield (Proof), MPa 390
190

Thermal Properties

Latent Heat of Fusion, J/g 380
340
Maximum Temperature: Mechanical, °C 200
250
Melting Completion (Liquidus), °C 630
640
Melting Onset (Solidus), °C 510
570
Specific Heat Capacity, J/kg-K 870
970
Thermal Conductivity, W/m-K 150
110
Thermal Expansion, µm/m-K 24
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
25
Electrical Conductivity: Equal Weight (Specific), % IACS 120
120

Otherwise Unclassified Properties

Density, g/cm3 2.9
2.0
Embodied Carbon, kg CO2/kg material 8.3
27
Embodied Energy, MJ/kg 150
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 41
5.5
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
400
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
60
Strength to Weight: Axial, points 44
36
Strength to Weight: Bending, points 45
46
Thermal Diffusivity, mm2/s 59
59
Thermal Shock Resistance, points 20
15

Alloy Composition

Aluminum (Al), % 90.7 to 93.7
0
Chromium (Cr), % 0 to 0.050
0
Copper (Cu), % 0 to 0.25
0 to 0.1
Iron (Fe), % 0 to 0.4
0
Magnesium (Mg), % 1.2 to 1.8
93.1 to 95.8
Manganese (Mn), % 0 to 0.1
0
Nickel (Ni), % 0
0 to 0.010
Silicon (Si), % 0 to 0.25
0
Silver (Ag), % 0
2.0 to 3.0
Titanium (Ti), % 0 to 0.1
0
Unspecified Rare Earths, % 0
1.8 to 2.5
Zinc (Zn), % 5.0 to 6.0
0
Zirconium (Zr), % 0.080 to 0.18
0.4 to 1.0
Residuals, % 0
0 to 0.3