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7020 Aluminum vs. EQ21A Magnesium

7020 aluminum belongs to the aluminum alloys classification, while EQ21A magnesium belongs to the magnesium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is 7020 aluminum and the bottom bar is EQ21A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 45 to 100
80
Elastic (Young's, Tensile) Modulus, GPa 70
44
Elongation at Break, % 8.4 to 14
2.4
Fatigue Strength, MPa 110 to 130
110
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
17
Shear Strength, MPa 110 to 230
150
Tensile Strength: Ultimate (UTS), MPa 190 to 390
250
Tensile Strength: Yield (Proof), MPa 120 to 310
190

Thermal Properties

Latent Heat of Fusion, J/g 380
340
Maximum Temperature: Mechanical, °C 210
160
Melting Completion (Liquidus), °C 650
640
Melting Onset (Solidus), °C 610
560
Specific Heat Capacity, J/kg-K 880
980
Thermal Conductivity, W/m-K 150
110
Thermal Expansion, µm/m-K 23
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 39
25
Electrical Conductivity: Equal Weight (Specific), % IACS 120
120

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
80
Density, g/cm3 2.9
1.9
Embodied Carbon, kg CO2/kg material 8.3
27
Embodied Energy, MJ/kg 150
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 23 to 46
5.6
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 690
410
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
63
Strength to Weight: Axial, points 18 to 37
37
Strength to Weight: Bending, points 25 to 41
47
Thermal Diffusivity, mm2/s 59
62
Thermal Shock Resistance, points 8.3 to 17
15

Alloy Composition

Aluminum (Al), % 91.2 to 94.8
0
Chromium (Cr), % 0.1 to 0.35
0
Copper (Cu), % 0 to 0.2
0.050 to 0.1
Iron (Fe), % 0 to 0.4
0
Magnesium (Mg), % 1.0 to 1.4
93.9 to 96.8
Manganese (Mn), % 0.050 to 0.5
0
Nickel (Ni), % 0
0 to 0.010
Silicon (Si), % 0 to 0.35
0
Silver (Ag), % 0
1.3 to 1.7
Titanium (Ti), % 0 to 0.25
0
Unspecified Rare Earths, % 0
1.5 to 3.0
Zinc (Zn), % 4.0 to 5.0
0
Zirconium (Zr), % 0.080 to 0.25
0.4 to 1.0
Residuals, % 0
0 to 0.3