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4045 Aluminum vs. AZ31C Magnesium

4045 aluminum belongs to the aluminum alloys classification, while AZ31C magnesium belongs to the magnesium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is 4045 aluminum and the bottom bar is AZ31C magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
45
Elongation at Break, % 2.3
12
Fatigue Strength, MPa 45
150
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
17
Shear Strength, MPa 69
130
Tensile Strength: Ultimate (UTS), MPa 120
260
Tensile Strength: Yield (Proof), MPa 64
200

Thermal Properties

Latent Heat of Fusion, J/g 540
350
Maximum Temperature: Mechanical, °C 160
110
Melting Completion (Liquidus), °C 600
600
Melting Onset (Solidus), °C 580
550
Specific Heat Capacity, J/kg-K 900
990
Thermal Conductivity, W/m-K 170
130
Thermal Expansion, µm/m-K 21
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 45
19
Electrical Conductivity: Equal Weight (Specific), % IACS 160
98

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
12
Density, g/cm3 2.6
1.7
Embodied Carbon, kg CO2/kg material 7.8
23
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 1070
970

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.4
28
Resilience: Unit (Modulus of Resilience), kJ/m3 29
440
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 54
70
Strength to Weight: Axial, points 13
42
Strength to Weight: Bending, points 21
53
Thermal Diffusivity, mm2/s 74
74
Thermal Shock Resistance, points 5.7
16

Alloy Composition

Aluminum (Al), % 87.4 to 91
2.4 to 3.6
Copper (Cu), % 0 to 0.3
0 to 0.1
Iron (Fe), % 0 to 0.8
0
Magnesium (Mg), % 0 to 0.050
93.4 to 97
Manganese (Mn), % 0 to 0.050
0.15 to 1.0
Nickel (Ni), % 0
0 to 0.030
Silicon (Si), % 9.0 to 11
0 to 0.1
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 0 to 0.1
0.5 to 1.5
Residuals, % 0
0 to 0.3