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AM50A Magnesium vs. 7020 Aluminum

AM50A magnesium belongs to the magnesium alloys classification, while 7020 aluminum belongs to the aluminum alloys.

For each property being compared, the top bar is AM50A magnesium and the bottom bar is 7020 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 58
45 to 100
Elastic (Young's, Tensile) Modulus, GPa 45
70
Elongation at Break, % 11
8.4 to 14
Fatigue Strength, MPa 70
110 to 130
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 17
26
Shear Strength, MPa 120
110 to 230
Tensile Strength: Ultimate (UTS), MPa 210
190 to 390
Tensile Strength: Yield (Proof), MPa 120
120 to 310

Thermal Properties

Latent Heat of Fusion, J/g 350
380
Maximum Temperature: Mechanical, °C 120
210
Melting Completion (Liquidus), °C 620
650
Melting Onset (Solidus), °C 570
610
Specific Heat Capacity, J/kg-K 1000
880
Thermal Conductivity, W/m-K 65
150
Thermal Expansion, µm/m-K 26
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 16
39
Electrical Conductivity: Equal Weight (Specific), % IACS 88
120

Otherwise Unclassified Properties

Base Metal Price, % relative 12
9.5
Density, g/cm3 1.7
2.9
Embodied Carbon, kg CO2/kg material 23
8.3
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 990
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19
23 to 46
Resilience: Unit (Modulus of Resilience), kJ/m3 150
110 to 690
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 71
47
Strength to Weight: Axial, points 35
18 to 37
Strength to Weight: Bending, points 47
25 to 41
Thermal Diffusivity, mm2/s 39
59
Thermal Shock Resistance, points 13
8.3 to 17

Alloy Composition


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Aluminum (Al), % 4.4 to 5.4
91.2 to 94.8
Chromium (Cr), % 0
0.1 to 0.35
Copper (Cu), % 0 to 0.010
0 to 0.2
Iron (Fe), % 0 to 0.0040
0 to 0.4
Magnesium (Mg), % 93.7 to 95.3
1.0 to 1.4
Manganese (Mn), % 0.26 to 0.6
0.050 to 0.5
Nickel (Ni), % 0 to 0.0020
0
Silicon (Si), % 0 to 0.1
0 to 0.35
Titanium (Ti), % 0
0 to 0.25
Zinc (Zn), % 0 to 0.22
4.0 to 5.0
Zirconium (Zr), % 0
0.080 to 0.25
Residuals, % 0
0 to 0.15