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7178 Aluminum vs. ISO-WD32350 Magnesium

7178 aluminum belongs to the aluminum alloys classification, while ISO-WD32350 magnesium belongs to the magnesium alloys.

For each property being compared, the top bar is 7178 aluminum and the bottom bar is ISO-WD32350 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 10
Fatigue Strength, MPa 120 to 210
120 to 130
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
18
Shear Strength, MPa 140 to 380
150 to 170
Tensile Strength: Ultimate (UTS), MPa 240 to 640
250 to 290
Tensile Strength: Yield (Proof), MPa 120 to 560
140 to 180

Thermal Properties

Latent Heat of Fusion, J/g 370
340
Maximum Temperature: Mechanical, °C 180
95
Melting Completion (Liquidus), °C 630
600
Melting Onset (Solidus), °C 480
560
Specific Heat Capacity, J/kg-K 860
990
Thermal Conductivity, W/m-K 130
130
Thermal Expansion, µm/m-K 23
25

Electrical Properties

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

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
960

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
14 to 23
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
210 to 380
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 45
68
Strength to Weight: Axial, points 21 to 58
39 to 46
Strength to Weight: Bending, points 28 to 54
50 to 55
Thermal Diffusivity, mm2/s 47
73
Thermal Shock Resistance, points 10 to 28
16 to 18

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0 to 0.1
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 to 0.060
Magnesium (Mg), % 2.4 to 3.1
95.7 to 97.7
Manganese (Mn), % 0 to 0.3
0.6 to 1.3
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
1.8 to 2.3
Residuals, % 0
0 to 0.3

Comparable Variants