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AZ31C Magnesium vs. 7204 Aluminum

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

For each property being compared, the top bar is AZ31C magnesium and the bottom bar is 7204 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
70
Elongation at Break, % 12
11 to 13
Fatigue Strength, MPa 150
110 to 130
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 17
26
Shear Strength, MPa 130
130 to 220
Tensile Strength: Ultimate (UTS), MPa 260
220 to 380
Tensile Strength: Yield (Proof), MPa 200
120 to 310

Thermal Properties

Latent Heat of Fusion, J/g 350
380
Maximum Temperature: Mechanical, °C 110
210
Melting Completion (Liquidus), °C 600
640
Melting Onset (Solidus), °C 550
520
Specific Heat Capacity, J/kg-K 990
880
Thermal Conductivity, W/m-K 130
150
Thermal Expansion, µm/m-K 26
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 19
39
Electrical Conductivity: Equal Weight (Specific), % IACS 98
120

Otherwise Unclassified Properties

Base Metal Price, % relative 12
9.5
Density, g/cm3 1.7
2.9
Embodied Carbon, kg CO2/kg material 23
8.4
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 970
1140

Common Calculations

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

Alloy Composition

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