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7204 Aluminum vs. AZ31C Magnesium

7204 aluminum belongs to the aluminum alloys classification, while AZ31C magnesium belongs to the magnesium alloys.

For each property being compared, the top bar is 7204 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, % 11 to 13
12
Fatigue Strength, MPa 110 to 130
150
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
17
Shear Strength, MPa 130 to 220
130
Tensile Strength: Ultimate (UTS), MPa 220 to 380
260
Tensile Strength: Yield (Proof), MPa 120 to 310
200

Thermal Properties

Latent Heat of Fusion, J/g 380
350
Maximum Temperature: Mechanical, °C 210
110
Melting Completion (Liquidus), °C 640
600
Melting Onset (Solidus), °C 520
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 39
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 8.4
23
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 1140
970

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 25 to 40
28
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 710
440
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 47
70
Strength to Weight: Axial, points 21 to 36
42
Strength to Weight: Bending, points 28 to 40
53
Thermal Diffusivity, mm2/s 58
74
Thermal Shock Resistance, points 9.4 to 16
16

Alloy Composition

Aluminum (Al), % 90.5 to 94.8
2.4 to 3.6
Chromium (Cr), % 0 to 0.3
0
Copper (Cu), % 0 to 0.2
0 to 0.1
Iron (Fe), % 0 to 0.35
0
Magnesium (Mg), % 1.0 to 2.0
93.4 to 97
Manganese (Mn), % 0.2 to 0.7
0.15 to 1.0
Nickel (Ni), % 0
0 to 0.030
Silicon (Si), % 0 to 0.3
0 to 0.1
Titanium (Ti), % 0 to 0.2
0
Vanadium (V), % 0 to 0.1
0
Zinc (Zn), % 4.0 to 5.0
0.5 to 1.5
Zirconium (Zr), % 0 to 0.25
0
Residuals, % 0
0 to 0.3