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4045 Aluminum vs. EQ21A Magnesium

4045 aluminum belongs to the aluminum alloys classification, while EQ21A magnesium belongs to the magnesium alloys. There are 29 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is 4045 aluminum and the bottom bar is EQ21A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
44
Elongation at Break, % 2.3
2.4
Fatigue Strength, MPa 45
110
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
17
Shear Strength, MPa 69
150
Tensile Strength: Ultimate (UTS), MPa 120
250
Tensile Strength: Yield (Proof), MPa 64
190

Thermal Properties

Latent Heat of Fusion, J/g 540
340
Maximum Temperature: Mechanical, °C 160
160
Melting Completion (Liquidus), °C 600
640
Melting Onset (Solidus), °C 580
560
Specific Heat Capacity, J/kg-K 900
980
Thermal Conductivity, W/m-K 170
110
Thermal Expansion, µm/m-K 21
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 45
25
Electrical Conductivity: Equal Weight (Specific), % IACS 160
120

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
80
Density, g/cm3 2.6
1.9
Embodied Carbon, kg CO2/kg material 7.8
27
Embodied Energy, MJ/kg 150
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.4
5.6
Resilience: Unit (Modulus of Resilience), kJ/m3 29
410
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 54
63
Strength to Weight: Axial, points 13
37
Strength to Weight: Bending, points 21
47
Thermal Diffusivity, mm2/s 74
62
Thermal Shock Resistance, points 5.7
15

Alloy Composition

Aluminum (Al), % 87.4 to 91
0
Copper (Cu), % 0 to 0.3
0.050 to 0.1
Iron (Fe), % 0 to 0.8
0
Magnesium (Mg), % 0 to 0.050
93.9 to 96.8
Manganese (Mn), % 0 to 0.050
0
Nickel (Ni), % 0
0 to 0.010
Silicon (Si), % 9.0 to 11
0
Silver (Ag), % 0
1.3 to 1.7
Titanium (Ti), % 0 to 0.2
0
Unspecified Rare Earths, % 0
1.5 to 3.0
Zinc (Zn), % 0 to 0.1
0
Zirconium (Zr), % 0
0.4 to 1.0
Residuals, % 0
0 to 0.3