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7204-T4 Aluminum vs. AZ91E-T4 Magnesium

7204-T4 aluminum belongs to the aluminum alloys classification, while AZ91E-T4 magnesium belongs to the magnesium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is 7204-T4 aluminum and the bottom bar is AZ91E-T4 magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
46
Elongation at Break, % 13
6.2
Fatigue Strength, MPa 110
85
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
18
Shear Strength, MPa 220
140
Tensile Strength: Ultimate (UTS), MPa 360
250
Tensile Strength: Yield (Proof), MPa 220
98

Thermal Properties

Latent Heat of Fusion, J/g 380
350
Maximum Temperature: Mechanical, °C 210
130
Melting Completion (Liquidus), °C 640
600
Melting Onset (Solidus), °C 520
500
Specific Heat Capacity, J/kg-K 880
990
Thermal Conductivity, W/m-K 150
84
Thermal Expansion, µm/m-K 24
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 39
10
Electrical Conductivity: Equal Weight (Specific), % IACS 120
52

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
12
Density, g/cm3 2.9
1.7
Embodied Carbon, kg CO2/kg material 8.4
22
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 1140
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 39
12
Resilience: Unit (Modulus of Resilience), kJ/m3 340
110
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 47
69
Strength to Weight: Axial, points 34
40
Strength to Weight: Bending, points 39
51
Thermal Diffusivity, mm2/s 58
49
Thermal Shock Resistance, points 16
14

Alloy Composition

Aluminum (Al), % 90.5 to 94.8
8.1 to 9.3
Chromium (Cr), % 0 to 0.3
0
Copper (Cu), % 0 to 0.2
0 to 0.015
Iron (Fe), % 0 to 0.35
0 to 0.0050
Magnesium (Mg), % 1.0 to 2.0
88.8 to 91.3
Manganese (Mn), % 0.2 to 0.7
0.17 to 0.35
Nickel (Ni), % 0
0 to 0.0010
Silicon (Si), % 0 to 0.3
0 to 0.2
Titanium (Ti), % 0 to 0.2
0
Vanadium (V), % 0 to 0.1
0
Zinc (Zn), % 4.0 to 5.0
0.4 to 1.0
Zirconium (Zr), % 0 to 0.25
0
Residuals, % 0
0 to 0.3