C70250 Copper vs. R05255 Alloy

C70250 copper belongs to the copper alloys classification, while R05255 alloy belongs to the otherwise unclassified metals. There are 16 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is C70250 copper and the bottom bar is R05255 alloy.

UNS C70250 (CW112C) Nickel-Silicon Copper UNS R05255 Tantalum-Tungsten Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		120
Elastic (Young's, Tensile) Modulus, GPa		190

Poisson's Ratio		0.34
Poisson's Ratio		0.34

Shear Modulus, GPa		44
Shear Modulus, GPa		70

Tensile Strength: Ultimate (UTS), MPa		520 to 740
Tensile Strength: Ultimate (UTS), MPa		540

Thermal Properties

Latent Heat of Fusion, J/g		220
Latent Heat of Fusion, J/g		140

Specific Heat Capacity, J/kg-K		390
Specific Heat Capacity, J/kg-K		140

Thermal Conductivity, W/m-K		170
Thermal Conductivity, W/m-K		59

Thermal Expansion, µm/m-K		17
Thermal Expansion, µm/m-K		6.6

Otherwise Unclassified Properties

Density, g/cm³		8.9
Density, g/cm³		17

Embodied Water, L/kg		310
Embodied Water, L/kg		630

Common Calculations

Stiffness to Weight: Axial, points		7.4
Stiffness to Weight: Axial, points		6.3

Stiffness to Weight: Bending, points		18
Stiffness to Weight: Bending, points		11

Strength to Weight: Axial, points		16 to 23
Strength to Weight: Axial, points		9.1

Strength to Weight: Bending, points		16 to 21
Strength to Weight: Bending, points		8.9

Thermal Diffusivity, mm²/s		49
Thermal Diffusivity, mm²/s		25

Thermal Shock Resistance, points		18 to 26
Thermal Shock Resistance, points		31

Alloy Composition

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

Copper (Cu), %		92.7 to 97.5
Copper (Cu), %		0

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

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

Lead (Pb), %		0 to 0.050
Lead (Pb), %		0

Magnesium (Mg), %		0.050 to 0.3
Magnesium (Mg), %		0

Manganese (Mn), %		0 to 0.1
Manganese (Mn), %		0

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

Nickel (Ni), %		2.2 to 4.2
Nickel (Ni), %		0 to 0.010

Niobium (Nb), %		0
Niobium (Nb), %		0 to 0.5

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

Oxygen (O), %		0
Oxygen (O), %		0 to 0.015

Silicon (Si), %		0.25 to 1.2
Silicon (Si), %		0 to 0.0050

Tantalum (Ta), %		0
Tantalum (Ta), %		95.9 to 98

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

Tungsten (W), %		0
Tungsten (W), %		2.0 to 3.5

Zinc (Zn), %		0 to 1.0
Zinc (Zn), %		0

Residuals, %		0 to 0.5
Residuals, %		0