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ZA-8 vs. 7021 Aluminum

ZA-8 belongs to the zinc alloys classification, while 7021 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (6, 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 ZA-8 and the bottom bar is 7021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 85 to 86
69
Elongation at Break, % 1.3 to 8.0
9.4
Fatigue Strength, MPa 51 to 100
150
Poisson's Ratio 0.26
0.32
Shear Modulus, GPa 34
26
Shear Strength, MPa 240 to 280
270
Tensile Strength: Ultimate (UTS), MPa 210 to 370
460
Tensile Strength: Yield (Proof), MPa 210 to 290
390

Thermal Properties

Latent Heat of Fusion, J/g 110
380
Maximum Temperature: Mechanical, °C 100
200
Melting Completion (Liquidus), °C 400
630
Melting Onset (Solidus), °C 380
510
Specific Heat Capacity, J/kg-K 440
870
Thermal Conductivity, W/m-K 120
150
Thermal Expansion, µm/m-K 23
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 28
38
Electrical Conductivity: Equal Weight (Specific), % IACS 40
120

Otherwise Unclassified Properties

Base Metal Price, % relative 11
9.5
Density, g/cm3 6.3
2.9
Embodied Carbon, kg CO2/kg material 3.3
8.3
Embodied Energy, MJ/kg 62
150
Embodied Water, L/kg 420
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.8 to 28
41
Resilience: Unit (Modulus of Resilience), kJ/m3 260 to 490
1110
Stiffness to Weight: Axial, points 7.5
13
Stiffness to Weight: Bending, points 23
47
Strength to Weight: Axial, points 9.3 to 17
44
Strength to Weight: Bending, points 12 to 18
45
Thermal Diffusivity, mm2/s 42
59
Thermal Shock Resistance, points 7.6 to 13
20

Alloy Composition

Aluminum (Al), % 8.0 to 8.8
90.7 to 93.7
Cadmium (Cd), % 0 to 0.0060
0
Chromium (Cr), % 0
0 to 0.050
Copper (Cu), % 0.8 to 1.3
0 to 0.25
Iron (Fe), % 0 to 0.075
0 to 0.4
Lead (Pb), % 0 to 0.0060
0
Magnesium (Mg), % 0.015 to 0.030
1.2 to 1.8
Manganese (Mn), % 0
0 to 0.1
Nickel (Ni), % 0 to 0.020
0
Silicon (Si), % 0 to 0.045
0 to 0.25
Tin (Sn), % 0 to 0.0030
0
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 89.7 to 91.2
5.0 to 6.0
Zirconium (Zr), % 0
0.080 to 0.18
Residuals, % 0
0 to 0.15