ASTM B685 Alloy vs. C71640 Copper-nickel

ASTM B685 alloy belongs to the otherwise unclassified metals classification, while C71640 copper-nickel belongs to the copper alloys. 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 ASTM B685 alloy and the bottom bar is C71640 copper-nickel.

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

Metric UnitsUS Customary Units

Mechanical Properties

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

Poisson's Ratio		0.37
Poisson's Ratio		0.33

Shear Modulus, GPa		43
Shear Modulus, GPa		52

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

Thermal Properties

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

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

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

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

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

Electrical Properties

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

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

Otherwise Unclassified Properties

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

Common Calculations

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

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

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

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

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

Alloy Composition

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

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

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

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

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

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

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

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

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

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

Residuals, %		0
Residuals, %		0 to 0.5