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7475 Aluminum vs. AZ31C Magnesium

7475 aluminum belongs to the aluminum alloys classification, while AZ31C magnesium belongs to the magnesium alloys.

For each property being compared, the top bar is 7475 aluminum and the bottom bar is AZ31C magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
45
Elongation at Break, % 10 to 12
12
Fatigue Strength, MPa 190 to 210
150
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 26
17
Shear Strength, MPa 320 to 350
130
Tensile Strength: Ultimate (UTS), MPa 530 to 590
260
Tensile Strength: Yield (Proof), MPa 440 to 520
200

Thermal Properties

Latent Heat of Fusion, J/g 380
350
Maximum Temperature: Mechanical, °C 180
110
Melting Completion (Liquidus), °C 640
600
Melting Onset (Solidus), °C 480
550
Specific Heat Capacity, J/kg-K 870
990
Thermal Conductivity, W/m-K 140 to 160
130
Thermal Expansion, µm/m-K 23
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33 to 42
19
Electrical Conductivity: Equal Weight (Specific), % IACS 98 to 120
98

Otherwise Unclassified Properties

Base Metal Price, % relative 10
12
Density, g/cm3 3.0
1.7
Embodied Carbon, kg CO2/kg material 8.2
23
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 1130
970

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 53 to 68
28
Resilience: Unit (Modulus of Resilience), kJ/m3 1390 to 1920
440
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 46
70
Strength to Weight: Axial, points 49 to 55
42
Strength to Weight: Bending, points 48 to 52
53
Thermal Diffusivity, mm2/s 53 to 63
74
Thermal Shock Resistance, points 23 to 26
16

Alloy Composition

Aluminum (Al), % 88.6 to 91.6
2.4 to 3.6
Chromium (Cr), % 0.18 to 0.25
0
Copper (Cu), % 1.2 to 1.9
0 to 0.1
Iron (Fe), % 0 to 0.12
0
Magnesium (Mg), % 1.9 to 2.6
93.4 to 97
Manganese (Mn), % 0 to 0.060
0.15 to 1.0
Nickel (Ni), % 0
0 to 0.030
Silicon (Si), % 0 to 0.1
0 to 0.1
Titanium (Ti), % 0 to 0.060
0
Zinc (Zn), % 5.1 to 6.2
0.5 to 1.5
Residuals, % 0
0 to 0.3