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ISO-WD32250 Magnesium vs. 7178 Aluminum

ISO-WD32250 magnesium belongs to the magnesium alloys classification, while 7178 aluminum belongs to the aluminum alloys.

For each property being compared, the top bar is ISO-WD32250 magnesium and the bottom bar is 7178 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
71
Elongation at Break, % 4.5 to 8.6
4.5 to 12
Fatigue Strength, MPa 170 to 210
120 to 210
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 17
27
Shear Strength, MPa 180 to 190
140 to 380
Tensile Strength: Ultimate (UTS), MPa 310 to 330
240 to 640
Tensile Strength: Yield (Proof), MPa 240 to 290
120 to 560

Thermal Properties

Latent Heat of Fusion, J/g 340
370
Maximum Temperature: Mechanical, °C 120
180
Melting Completion (Liquidus), °C 600
630
Melting Onset (Solidus), °C 550
480
Specific Heat Capacity, J/kg-K 980
860
Thermal Conductivity, W/m-K 130
130
Thermal Expansion, µm/m-K 26
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 25
31
Electrical Conductivity: Equal Weight (Specific), % IACS 130
91

Otherwise Unclassified Properties

Base Metal Price, % relative 13
10
Density, g/cm3 1.8
3.1
Embodied Carbon, kg CO2/kg material 24
8.2
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 950
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 14 to 26
24 to 52
Resilience: Unit (Modulus of Resilience), kJ/m3 630 to 930
110 to 2220
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 67
45
Strength to Weight: Axial, points 49 to 51
21 to 58
Strength to Weight: Bending, points 58 to 60
28 to 54
Thermal Diffusivity, mm2/s 72
47
Thermal Shock Resistance, points 19 to 20
10 to 28

Alloy Composition

Aluminum (Al), % 0
85.4 to 89.5
Chromium (Cr), % 0
0.18 to 0.28
Copper (Cu), % 0
1.6 to 2.4
Iron (Fe), % 0
0 to 0.5
Magnesium (Mg), % 94.9 to 97.1
2.4 to 3.1
Manganese (Mn), % 0
0 to 0.3
Silicon (Si), % 0
0 to 0.4
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 2.5 to 4.0
6.3 to 7.3
Zirconium (Zr), % 0.45 to 0.8
0
Residuals, % 0
0 to 0.15