C71640 Copper-nickel vs. ASTM B685 Alloy

C71640 copper-nickel belongs to the copper alloys classification, while ASTM B685 alloy belongs to the otherwise unclassified metals. They have 40% of their average alloy composition in common. There are 17 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is C71640 copper-nickel and the bottom bar is ASTM B685 alloy.

UNS C71640 Copper-Nickel ASTM B685 Palladium-Copper Electrical Contact Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		140
Elastic (Young's, Tensile) Modulus, GPa		120

Poisson's Ratio		0.33
Poisson's Ratio		0.37

Shear Modulus, GPa		52
Shear Modulus, GPa		43

Tensile Strength: Ultimate (UTS), MPa		490 to 630
Tensile Strength: Ultimate (UTS), MPa		660 to 1060

Thermal Properties

Latent Heat of Fusion, J/g		240
Latent Heat of Fusion, J/g		180

Melting Completion (Liquidus), °C		1180
Melting Completion (Liquidus), °C		1230

Melting Onset (Solidus), °C		1120
Melting Onset (Solidus), °C		1200

Specific Heat Capacity, J/kg-K		410
Specific Heat Capacity, J/kg-K		300

Thermal Expansion, µm/m-K		15
Thermal Expansion, µm/m-K		14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		7.0
Electrical Conductivity: Equal Volume, % IACS		5.0

Electrical Conductivity: Equal Weight (Specific), % IACS		7.1
Electrical Conductivity: Equal Weight (Specific), % IACS		4.1

Otherwise Unclassified Properties

Density, g/cm³		8.9
Density, g/cm³		11

Common Calculations

Stiffness to Weight: Axial, points		8.7
Stiffness to Weight: Axial, points		6.1

Stiffness to Weight: Bending, points		20
Stiffness to Weight: Bending, points		15

Strength to Weight: Axial, points		15 to 20
Strength to Weight: Axial, points		17 to 27

Strength to Weight: Bending, points		16 to 18
Strength to Weight: Bending, points		16 to 21

Thermal Shock Resistance, points		16 to 21
Thermal Shock Resistance, points		28 to 46

Alloy Composition

Aluminum (Al), %		0
Aluminum (Al), %		0 to 0.0050

Cadmium (Cd), %		0
Cadmium (Cd), %		0 to 0.050

Copper (Cu), %		61.7 to 67.8
Copper (Cu), %		39.5 to 40.5

Iron (Fe), %		1.7 to 2.3
Iron (Fe), %		0 to 0.050

Lead (Pb), %		0 to 0.050
Lead (Pb), %		0 to 0.030

Manganese (Mn), %		1.5 to 2.5
Manganese (Mn), %		0

Nickel (Ni), %		29 to 32
Nickel (Ni), %		0

Palladium (Pd), %		0
Palladium (Pd), %		59 to 60.5

Silver (Ag), %		0
Silver (Ag), %		0 to 0.1

Zinc (Zn), %		0 to 1.0
Zinc (Zn), %		0 to 0.060

Residuals, %		0
Residuals, %		0 to 0.2