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ZK40A Magnesium vs. 6351 Aluminum

ZK40A magnesium belongs to the magnesium alloys classification, while 6351 aluminum belongs to the aluminum alloys.

For each property being compared, the top bar is ZK40A magnesium and the bottom bar is 6351 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
69
Elongation at Break, % 4.2
7.8 to 18
Fatigue Strength, MPa 190
79 to 130
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 17
26
Shear Strength, MPa 160
84 to 200
Tensile Strength: Ultimate (UTS), MPa 280
140 to 310
Tensile Strength: Yield (Proof), MPa 260
95 to 270

Thermal Properties

Latent Heat of Fusion, J/g 340
410
Maximum Temperature: Mechanical, °C 120
160
Melting Completion (Liquidus), °C 600
650
Melting Onset (Solidus), °C 540
570
Specific Heat Capacity, J/kg-K 970
900
Thermal Conductivity, W/m-K 110
180
Thermal Expansion, µm/m-K 26
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 27
46
Electrical Conductivity: Equal Weight (Specific), % IACS 130
150

Otherwise Unclassified Properties

Base Metal Price, % relative 13
9.5
Density, g/cm3 1.8
2.7
Embodied Carbon, kg CO2/kg material 24
8.3
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 950
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 12
20 to 38
Resilience: Unit (Modulus of Resilience), kJ/m3 740
65 to 540
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 65
50
Strength to Weight: Axial, points 43
14 to 32
Strength to Weight: Bending, points 53
22 to 38
Thermal Diffusivity, mm2/s 62
72
Thermal Shock Resistance, points 17
6.1 to 14

Alloy Composition


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Aluminum (Al), % 0
96 to 98.5
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 0
0 to 0.5
Magnesium (Mg), % 94.2 to 96.1
0.4 to 0.8
Manganese (Mn), % 0
0.4 to 0.8
Silicon (Si), % 0
0.7 to 1.3
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 3.5 to 4.5
0 to 0.2
Zirconium (Zr), % 0.45 to 1.0
0
Residuals, % 0 to 0.3
0 to 0.15