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7178 Aluminum vs. Low-oxygen Zirconium

7178 aluminum belongs to the aluminum alloys classification, while low-oxygen zirconium belongs to the otherwise unclassified metals. There are 20 material properties with values for both materials. Properties with values for just one material (10, 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 7178 aluminum and the bottom bar is low-oxygen zirconium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
98
Elongation at Break, % 4.5 to 12
23
Poisson's Ratio 0.32
0.34
Shear Modulus, GPa 27
37
Tensile Strength: Ultimate (UTS), MPa 240 to 640
330
Tensile Strength: Yield (Proof), MPa 120 to 560
270

Thermal Properties

Latent Heat of Fusion, J/g 370
250
Specific Heat Capacity, J/kg-K 860
270
Thermal Conductivity, W/m-K 130
22
Thermal Expansion, µm/m-K 23
5.7

Otherwise Unclassified Properties

Density, g/cm3 3.1
6.7
Embodied Water, L/kg 1110
450

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
70
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
370
Stiffness to Weight: Axial, points 13
8.1
Stiffness to Weight: Bending, points 45
23
Strength to Weight: Axial, points 21 to 58
14
Strength to Weight: Bending, points 28 to 54
16
Thermal Diffusivity, mm2/s 47
12
Thermal Shock Resistance, points 10 to 28
42

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0
Carbon (C), % 0
0 to 0.050
Chromium (Cr), % 0.18 to 0.28
0 to 0.2
Copper (Cu), % 1.6 to 2.4
0
Hafnium (Hf), % 0
0 to 4.5
Hydrogen (H), % 0
0 to 0.0050
Iron (Fe), % 0 to 0.5
0 to 0.2
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0
Nitrogen (N), % 0
0 to 0.025
Oxygen (O), % 0
0 to 0.1
Silicon (Si), % 0 to 0.4
0
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 6.3 to 7.3
0
Zirconium (Zr), % 0
94.7 to 100
Residuals, % 0 to 0.15
0