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Z21721 Zinc vs. 7021 Aluminum

Z21721 zinc belongs to the zinc alloys classification, while 7021 aluminum belongs to the aluminum alloys. There are 28 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is Z21721 zinc and the bottom bar is 7021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 87
69
Elongation at Break, % 40
9.4
Poisson's Ratio 0.25
0.32
Shear Modulus, GPa 35
26
Tensile Strength: Ultimate (UTS), MPa 150
460
Tensile Strength: Yield (Proof), MPa 120
390

Thermal Properties

Latent Heat of Fusion, J/g 110
380
Maximum Temperature: Mechanical, °C 90
200
Melting Completion (Liquidus), °C 410
630
Melting Onset (Solidus), °C 390
510
Specific Heat Capacity, J/kg-K 390
870
Thermal Conductivity, W/m-K 110
150
Thermal Expansion, µm/m-K 26
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 27
38
Electrical Conductivity: Equal Weight (Specific), % IACS 37
120

Otherwise Unclassified Properties

Base Metal Price, % relative 11
9.5
Density, g/cm3 6.6
2.9
Embodied Carbon, kg CO2/kg material 2.8
8.3
Embodied Energy, MJ/kg 53
150
Embodied Water, L/kg 340
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
41
Resilience: Unit (Modulus of Resilience), kJ/m3 88
1110
Stiffness to Weight: Axial, points 7.3
13
Stiffness to Weight: Bending, points 22
47
Strength to Weight: Axial, points 6.4
44
Strength to Weight: Bending, points 9.6
45
Thermal Diffusivity, mm2/s 44
59
Thermal Shock Resistance, points 4.8
20

Alloy Composition


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Aluminum (Al), % 0 to 0.0020
90.7 to 93.7
Cadmium (Cd), % 0 to 0.070
0
Chromium (Cr), % 0
0 to 0.050
Copper (Cu), % 0 to 0.0050
0 to 0.25
Iron (Fe), % 0 to 0.010
0 to 0.4
Lead (Pb), % 0 to 1.0
0
Magnesium (Mg), % 0
1.2 to 1.8
Manganese (Mn), % 0
0 to 0.1
Silicon (Si), % 0
0 to 0.25
Titanium (Ti), % 0 to 0.020
0 to 0.1
Zinc (Zn), % 98.9 to 100
5.0 to 6.0
Zirconium (Zr), % 0
0.080 to 0.18
Residuals, % 0
0 to 0.15