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7129-T6 Aluminum vs. AZ91D-T6 Magnesium

7129-T6 aluminum belongs to the aluminum alloys classification, while AZ91D-T6 magnesium belongs to the magnesium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is 7129-T6 aluminum and the bottom bar is AZ91D-T6 magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
46
Elongation at Break, % 9.0
2.3
Fatigue Strength, MPa 150
74
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
18
Shear Strength, MPa 250
120
Tensile Strength: Ultimate (UTS), MPa 430
210
Tensile Strength: Yield (Proof), MPa 390
130

Thermal Properties

Latent Heat of Fusion, J/g 380
350
Maximum Temperature: Mechanical, °C 180
130
Melting Completion (Liquidus), °C 630
600
Melting Onset (Solidus), °C 510
490
Specific Heat Capacity, J/kg-K 880
990
Thermal Conductivity, W/m-K 150
78
Thermal Expansion, µm/m-K 24
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
11
Electrical Conductivity: Equal Weight (Specific), % IACS 120
58

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
22
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 1150
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37
4.2
Resilience: Unit (Modulus of Resilience), kJ/m3 1090
170
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 47
69
Strength to Weight: Axial, points 41
33
Strength to Weight: Bending, points 43
45
Thermal Diffusivity, mm2/s 58
45
Thermal Shock Resistance, points 19
12

Alloy Composition

Aluminum (Al), % 91 to 94
8.3 to 9.7
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 0.5 to 0.9
0 to 0.030
Gallium (Ga), % 0 to 0.030
0
Iron (Fe), % 0 to 0.3
0 to 0.0050
Magnesium (Mg), % 1.3 to 2.0
88.7 to 91.2
Manganese (Mn), % 0 to 0.1
0.15 to 0.5
Nickel (Ni), % 0
0 to 0.0020
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
0.35 to 1.0
Residuals, % 0 to 0.15
0