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4145 Aluminum vs. ZK51A Magnesium

4145 aluminum belongs to the aluminum alloys classification, while ZK51A magnesium belongs to the magnesium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is 4145 aluminum and the bottom bar is ZK51A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
45
Elongation at Break, % 2.2
4.7
Fatigue Strength, MPa 48
62
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 28
18
Shear Strength, MPa 69
160
Tensile Strength: Ultimate (UTS), MPa 120
240
Tensile Strength: Yield (Proof), MPa 68
150

Thermal Properties

Latent Heat of Fusion, J/g 540
340
Maximum Temperature: Mechanical, °C 160
120
Melting Completion (Liquidus), °C 590
640
Melting Onset (Solidus), °C 520
550
Specific Heat Capacity, J/kg-K 880
970
Thermal Conductivity, W/m-K 100
110
Thermal Expansion, µm/m-K 21
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
28
Electrical Conductivity: Equal Weight (Specific), % IACS 84
140

Otherwise Unclassified Properties

Base Metal Price, % relative 10
13
Density, g/cm3 2.8
1.8
Embodied Carbon, kg CO2/kg material 7.6
24
Embodied Energy, MJ/kg 140
160
Embodied Water, L/kg 1040
940

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
10
Resilience: Unit (Modulus of Resilience), kJ/m3 31
260
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
64
Strength to Weight: Axial, points 12
36
Strength to Weight: Bending, points 19
47
Thermal Diffusivity, mm2/s 42
61
Thermal Shock Resistance, points 5.5
15

Alloy Composition

Aluminum (Al), % 83 to 87.4
0
Chromium (Cr), % 0 to 0.15
0
Copper (Cu), % 3.3 to 4.7
0 to 0.1
Iron (Fe), % 0 to 0.8
0
Magnesium (Mg), % 0 to 0.15
93.1 to 95.9
Manganese (Mn), % 0 to 0.15
0
Nickel (Ni), % 0
0 to 0.010
Silicon (Si), % 9.3 to 10.7
0
Zinc (Zn), % 0 to 0.2
3.6 to 5.5
Zirconium (Zr), % 0
0.5 to 1.0
Residuals, % 0
0 to 0.3