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7075-T6 Aluminum vs. AZ91E-T6 Magnesium

7075-T6 aluminum belongs to the aluminum alloys classification, while AZ91E-T6 magnesium belongs to the magnesium alloys. There are 31 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 7075-T6 aluminum and the bottom bar is AZ91E-T6 magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
75
Elastic (Young's, Tensile) Modulus, GPa 70
46
Elongation at Break, % 7.9
3.9
Fatigue Strength, MPa 160
84
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 26
18
Shear Strength, MPa 330
150
Tensile Strength: Ultimate (UTS), MPa 560
260
Tensile Strength: Yield (Proof), MPa 480
130

Thermal Properties

Latent Heat of Fusion, J/g 380
350
Maximum Temperature: Mechanical, °C 200
130
Melting Completion (Liquidus), °C 640
600
Melting Onset (Solidus), °C 480
500
Specific Heat Capacity, J/kg-K 870
990
Thermal Conductivity, W/m-K 130
84
Thermal Expansion, µm/m-K 23
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33
11
Electrical Conductivity: Equal Weight (Specific), % IACS 98
58

Otherwise Unclassified Properties

Base Metal Price, % relative 10
12
Density, g/cm3 3.0
1.7
Embodied Carbon, kg CO2/kg material 8.3
22
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 1120
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 42
8.6
Resilience: Unit (Modulus of Resilience), kJ/m3 1630
190
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 46
69
Strength to Weight: Axial, points 51
42
Strength to Weight: Bending, points 50
53
Thermal Diffusivity, mm2/s 50
49
Thermal Shock Resistance, points 24
15

Alloy Composition

Aluminum (Al), % 86.9 to 91.4
8.1 to 9.3
Chromium (Cr), % 0.18 to 0.28
0
Copper (Cu), % 1.2 to 2.0
0 to 0.015
Iron (Fe), % 0 to 0.5
0 to 0.0050
Magnesium (Mg), % 2.1 to 2.9
88.8 to 91.3
Manganese (Mn), % 0 to 0.3
0.17 to 0.35
Nickel (Ni), % 0
0 to 0.0010
Silicon (Si), % 0 to 0.4
0 to 0.2
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 5.1 to 6.1
0.4 to 1.0
Zirconium (Zr), % 0 to 0.25
0
Residuals, % 0
0 to 0.3