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2117 Aluminum vs. Type 4 Niobium

2117 aluminum belongs to the aluminum alloys classification, while Type 4 niobium belongs to the otherwise unclassified metals. There are 21 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 2117 aluminum and the bottom bar is Type 4 niobium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 70
120
Elastic (Young's, Tensile) Modulus, GPa 71
110
Elongation at Break, % 26
23
Poisson's Ratio 0.33
0.4
Shear Modulus, GPa 27
38
Tensile Strength: Ultimate (UTS), MPa 300
220
Tensile Strength: Yield (Proof), MPa 170
140

Thermal Properties

Latent Heat of Fusion, J/g 400
310
Specific Heat Capacity, J/kg-K 880
270
Thermal Conductivity, W/m-K 150
42
Thermal Expansion, µm/m-K 24
7.3

Otherwise Unclassified Properties

Density, g/cm3 3.0
8.6
Embodied Water, L/kg 1150
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 64
44
Resilience: Unit (Modulus of Resilience), kJ/m3 190
93
Stiffness to Weight: Axial, points 13
6.8
Stiffness to Weight: Bending, points 47
18
Strength to Weight: Axial, points 28
7.2
Strength to Weight: Bending, points 33
9.5
Thermal Diffusivity, mm2/s 59
18
Thermal Shock Resistance, points 12
21

Alloy Composition

Aluminum (Al), % 91 to 97.6
0
Carbon (C), % 0
0 to 0.010
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 2.2 to 4.5
0
Hafnium (Hf), % 0
0 to 0.020
Hydrogen (H), % 0
0 to 0.0015
Iron (Fe), % 0 to 0.7
0 to 0.010
Magnesium (Mg), % 0.2 to 1.0
0
Manganese (Mn), % 0.4 to 1.0
0
Molybdenum (Mo), % 0
0 to 0.050
Nickel (Ni), % 0
0 to 0.0050
Niobium (Nb), % 0
98.1 to 99.2
Nitrogen (N), % 0
0 to 0.010
Oxygen (O), % 0
0 to 0.025
Silicon (Si), % 0.2 to 0.8
0 to 0.0050
Tantalum (Ta), % 0
0 to 0.5
Titanium (Ti), % 0 to 0.25
0 to 0.020
Tungsten (W), % 0
0 to 0.050
Zinc (Zn), % 0 to 0.25
0
Zirconium (Zr), % 0 to 0.25
0.8 to 1.2
Residuals, % 0 to 0.15
0