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7129 Aluminum vs. AZ31C Magnesium

7129 Aluminum belongs to the aluminum alloys classification, while AZ31C magnesium belongs to the magnesium alloys.

For each property being compared, the top bar is 7129 Aluminum and the bottom bar is AZ31C magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
45
Elongation at Break, % 9.0 to 9.1
12
Fatigue Strength, MPa 150 to 190
150
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
17
Shear Strength, MPa 250 to 260
130
Tensile Strength: Ultimate (UTS), MPa 430
260
Tensile Strength: Yield (Proof), MPa 380 to 390
200

Thermal Properties

Latent Heat of Fusion, J/g 380
350
Maximum Temperature: Mechanical, °C 180
110
Melting Completion (Liquidus), °C 630
600
Melting Onset (Solidus), °C 510
550
Specific Heat Capacity, J/kg-K 880
990
Thermal Conductivity, W/m-K 150
130
Thermal Expansion, µm/m-K 24
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
19
Electrical Conductivity: Equal Weight (Specific), % IACS 120
98

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
12
Density, g/cm3 2.9
1.7
Embodied Carbon, kg CO2/kg material 8.3
23
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 1150
970

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37 to 38
28
Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1090
440
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 47
70
Strength to Weight: Axial, points 41
42
Strength to Weight: Bending, points 43 to 44
53
Thermal Diffusivity, mm2/s 58
74
Thermal Shock Resistance, points 19
16

Alloy Composition

Aluminum (Al), % 91 to 94
2.4 to 3.6
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 0.5 to 0.9
0 to 0.1
Gallium (Ga), % 0 to 0.030
0
Iron (Fe), % 0 to 0.3
0
Magnesium (Mg), % 1.3 to 2.0
93.4 to 97
Manganese (Mn), % 0 to 0.1
0.15 to 1.0
Nickel (Ni), % 0
0 to 0.030
Silicon (Si), % 0 to 0.15
0 to 0.1
Titanium (Ti), % 0 to 0.050
0
Vanadium (V), % 0 to 0.050
0
Zinc (Zn), % 4.2 to 5.2
0.5 to 1.5
Residuals, % 0
0 to 0.3