C81400 Copper vs. R05240 Alloy

C81400 copper belongs to the copper alloys classification, while R05240 alloy belongs to the otherwise unclassified metals. There are 18 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is C81400 copper and the bottom bar is R05240 alloy.

UNS C81400 (Alloy 70C) Beryllium Copper UNS R05240 Tantalum-Niobium Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		120
Elastic (Young's, Tensile) Modulus, GPa		150

Elongation at Break, %		11
Elongation at Break, %		25

Poisson's Ratio		0.34
Poisson's Ratio		0.36

Shear Modulus, GPa		41
Shear Modulus, GPa		57

Tensile Strength: Ultimate (UTS), MPa		370
Tensile Strength: Ultimate (UTS), MPa		270

Tensile Strength: Yield (Proof), MPa		250
Tensile Strength: Yield (Proof), MPa		170

Thermal Properties

Latent Heat of Fusion, J/g		210
Latent Heat of Fusion, J/g		210

Specific Heat Capacity, J/kg-K		390
Specific Heat Capacity, J/kg-K		190

Thermal Expansion, µm/m-K		17
Thermal Expansion, µm/m-K		6.8

Otherwise Unclassified Properties

Density, g/cm³		8.9
Density, g/cm³		14

Embodied Water, L/kg		310
Embodied Water, L/kg		460

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		36
Resilience: Ultimate (Unit Rupture Work), MJ/m³		59

Resilience: Unit (Modulus of Resilience), kJ/m³		260
Resilience: Unit (Modulus of Resilience), kJ/m³		90

Stiffness to Weight: Axial, points		7.3
Stiffness to Weight: Axial, points		6.3

Stiffness to Weight: Bending, points		18
Stiffness to Weight: Bending, points		13

Strength to Weight: Axial, points		11
Strength to Weight: Axial, points		5.4

Strength to Weight: Bending, points		13
Strength to Weight: Bending, points		6.8

Thermal Shock Resistance, points		13
Thermal Shock Resistance, points		18

Alloy Composition

Beryllium (Be), %		0.020 to 0.1
Beryllium (Be), %		0

Carbon (C), %		0
Carbon (C), %		0 to 0.010

Chromium (Cr), %		0.6 to 1.0
Chromium (Cr), %		0

Copper (Cu), %		98.4 to 99.38
Copper (Cu), %		0

Hydrogen (H), %		0
Hydrogen (H), %		0 to 0.0015

Iron (Fe), %		0
Iron (Fe), %		0 to 0.010

Molybdenum (Mo), %		0
Molybdenum (Mo), %		0 to 0.020

Nickel (Ni), %		0
Nickel (Ni), %		0 to 0.010

Niobium (Nb), %		0
Niobium (Nb), %		35 to 42

Nitrogen (N), %		0
Nitrogen (N), %		0 to 0.010

Oxygen (O), %		0
Oxygen (O), %		0 to 0.020

Silicon (Si), %		0
Silicon (Si), %		0 to 0.0050

Tantalum (Ta), %		0
Tantalum (Ta), %		57.9 to 65

Titanium (Ti), %		0
Titanium (Ti), %		0 to 0.010

Tungsten (W), %		0
Tungsten (W), %		0 to 0.050

Residuals, %		0 to 0.5
Residuals, %		0