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7178 Aluminum vs. ZK51A Magnesium

7178 aluminum belongs to the aluminum alloys classification, while ZK51A magnesium belongs to the magnesium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is 7178 aluminum and the bottom bar is ZK51A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
45
Elongation at Break, % 4.5 to 12
4.7
Fatigue Strength, MPa 120 to 210
62
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
18
Shear Strength, MPa 140 to 380
160
Tensile Strength: Ultimate (UTS), MPa 240 to 640
240
Tensile Strength: Yield (Proof), MPa 120 to 560
150

Thermal Properties

Latent Heat of Fusion, J/g 370
340
Maximum Temperature: Mechanical, °C 180
120
Melting Completion (Liquidus), °C 630
640
Melting Onset (Solidus), °C 480
550
Specific Heat Capacity, J/kg-K 860
970
Thermal Conductivity, W/m-K 130
110
Thermal Expansion, µm/m-K 23
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
28
Electrical Conductivity: Equal Weight (Specific), % IACS 91
140

Otherwise Unclassified Properties

Base Metal Price, % relative 10
13
Density, g/cm3 3.1
1.8
Embodied Carbon, kg CO2/kg material 8.2
24
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 1110
940

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
10
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
260
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
64
Strength to Weight: Axial, points 21 to 58
36
Strength to Weight: Bending, points 28 to 54
47
Thermal Diffusivity, mm2/s 47
61
Thermal Shock Resistance, points 10 to 28
15

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0
Chromium (Cr), % 0.18 to 0.28
0
Copper (Cu), % 1.6 to 2.4
0 to 0.1
Iron (Fe), % 0 to 0.5
0
Magnesium (Mg), % 2.4 to 3.1
93.1 to 95.9
Manganese (Mn), % 0 to 0.3
0
Nickel (Ni), % 0
0 to 0.010
Silicon (Si), % 0 to 0.4
0
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 6.3 to 7.3
3.6 to 5.5
Zirconium (Zr), % 0
0.5 to 1.0
Residuals, % 0
0 to 0.3