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7020 Aluminum vs. EN-MC65120 Magnesium

7020 aluminum belongs to the aluminum alloys classification, while EN-MC65120 magnesium belongs to the magnesium alloys.

For each property being compared, the top bar is 7020 aluminum and the bottom bar is EN-MC65120 magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 45 to 100
55
Elastic (Young's, Tensile) Modulus, GPa 70
45
Elongation at Break, % 8.4 to 14
3.1
Fatigue Strength, MPa 110 to 130
80
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
17
Shear Strength, MPa 110 to 230
92
Tensile Strength: Ultimate (UTS), MPa 190 to 390
160
Tensile Strength: Yield (Proof), MPa 120 to 310
110

Thermal Properties

Latent Heat of Fusion, J/g 380
330
Maximum Temperature: Mechanical, °C 210
180
Melting Completion (Liquidus), °C 650
590
Melting Onset (Solidus), °C 610
520
Specific Heat Capacity, J/kg-K 880
970
Thermal Conductivity, W/m-K 150
100
Thermal Expansion, µm/m-K 23
26

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
25
Density, g/cm3 2.9
1.9
Embodied Carbon, kg CO2/kg material 8.3
25
Embodied Energy, MJ/kg 150
190
Embodied Water, L/kg 1150
930

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 23 to 46
4.4
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 690
140
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
62
Strength to Weight: Axial, points 18 to 37
23
Strength to Weight: Bending, points 25 to 41
34
Thermal Diffusivity, mm2/s 59
56
Thermal Shock Resistance, points 8.3 to 17
9.8

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 to 0.030
Iron (Fe), % 0 to 0.4
0 to 0.010
Magnesium (Mg), % 1.0 to 1.4
91.8 to 95.1
Manganese (Mn), % 0.050 to 0.5
0 to 0.15
Nickel (Ni), % 0
0 to 0.0050
Silicon (Si), % 0 to 0.35
0 to 0.010
Titanium (Ti), % 0 to 0.25
0
Unspecified Rare Earths, % 0
2.5 to 4.0
Zinc (Zn), % 4.0 to 5.0
2.0 to 3.0
Zirconium (Zr), % 0.080 to 0.25
0.4 to 1.0
Residuals, % 0
0 to 0.010