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ZK40A Magnesium vs. 2618A Aluminum

ZK40A magnesium belongs to the magnesium alloys classification, while 2618A aluminum belongs to the aluminum alloys.

For each property being compared, the top bar is ZK40A magnesium and the bottom bar is 2618A aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
72
Elongation at Break, % 4.2
4.5
Fatigue Strength, MPa 190
120
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 17
27
Shear Strength, MPa 160
260
Tensile Strength: Ultimate (UTS), MPa 280
440
Tensile Strength: Yield (Proof), MPa 260
410

Thermal Properties

Latent Heat of Fusion, J/g 340
390
Maximum Temperature: Mechanical, °C 120
230
Melting Completion (Liquidus), °C 600
670
Melting Onset (Solidus), °C 540
560
Specific Heat Capacity, J/kg-K 970
880
Thermal Conductivity, W/m-K 110
150
Thermal Expansion, µm/m-K 26
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 27
37
Electrical Conductivity: Equal Weight (Specific), % IACS 130
110

Otherwise Unclassified Properties

Base Metal Price, % relative 13
11
Density, g/cm3 1.8
3.0
Embodied Carbon, kg CO2/kg material 24
8.4
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 950
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 12
19
Resilience: Unit (Modulus of Resilience), kJ/m3 740
1180
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 65
47
Strength to Weight: Axial, points 43
41
Strength to Weight: Bending, points 53
44
Thermal Diffusivity, mm2/s 62
59
Thermal Shock Resistance, points 17
19

Alloy Composition


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Aluminum (Al), % 0
91.5 to 95.2
Copper (Cu), % 0
1.8 to 2.7
Iron (Fe), % 0
0.9 to 1.4
Magnesium (Mg), % 94.2 to 96.1
1.2 to 1.8
Manganese (Mn), % 0
0 to 0.25
Nickel (Ni), % 0
0.8 to 1.4
Silicon (Si), % 0
0.15 to 0.25
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 3.5 to 4.5
0 to 0.15
Zirconium (Zr), % 0.45 to 1.0
0 to 0.25
Residuals, % 0 to 0.3
0 to 0.15