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7178 Aluminum vs. ISO-WD21150 Magnesium

7178 aluminum belongs to the aluminum alloys classification, while ISO-WD21150 magnesium belongs to the magnesium alloys. There are 29 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 ISO-WD21150 magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
45
Elongation at Break, % 4.5 to 12
5.7 to 11
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
17
Shear Strength, MPa 140 to 380
150 to 170
Tensile Strength: Ultimate (UTS), MPa 240 to 640
240 to 290
Tensile Strength: Yield (Proof), MPa 120 to 560
120 to 200

Thermal Properties

Latent Heat of Fusion, J/g 370
350
Maximum Temperature: Mechanical, °C 180
110
Melting Completion (Liquidus), °C 630
600
Melting Onset (Solidus), °C 480
550
Specific Heat Capacity, J/kg-K 860
990
Thermal Conductivity, W/m-K 130
100
Thermal Expansion, µm/m-K 23
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
19
Electrical Conductivity: Equal Weight (Specific), % IACS 91
100

Otherwise Unclassified Properties

Base Metal Price, % relative 10
12
Density, g/cm3 3.1
1.7
Embodied Carbon, kg CO2/kg material 8.2
23
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 1110
980

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
15 to 24
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
160 to 460
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 45
70
Strength to Weight: Axial, points 21 to 58
40 to 48
Strength to Weight: Bending, points 28 to 54
52 to 58
Thermal Diffusivity, mm2/s 47
60
Thermal Shock Resistance, points 10 to 28
15 to 17

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
2.4 to 3.6
Chromium (Cr), % 0.18 to 0.28
0
Copper (Cu), % 1.6 to 2.4
0 to 0.050
Iron (Fe), % 0 to 0.5
0 to 0.0050
Magnesium (Mg), % 2.4 to 3.1
94 to 97
Manganese (Mn), % 0 to 0.3
0.15 to 0.4
Nickel (Ni), % 0
0 to 0.0050
Silicon (Si), % 0 to 0.4
0 to 0.1
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 6.3 to 7.3
0.5 to 1.5
Residuals, % 0
0 to 0.3

Comparable Variants