C71640 Copper-nickel vs. ASTM B628 Ag-Cu

C71640 copper-nickel belongs to the copper alloys classification, while ASTM B628 Ag-Cu belongs to the otherwise unclassified metals. They have a modest 28% of their average alloy composition in common, which, by itself, doesn't mean much. There are 17 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 C71640 copper-nickel and the bottom bar is ASTM B628 Ag-Cu.

UNS C71640 Copper-Nickel ASTM B628 Silver-Copper Eutectic Electrical Contact Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		140
Elastic (Young's, Tensile) Modulus, GPa		83

Poisson's Ratio		0.33
Poisson's Ratio		0.36

Shear Modulus, GPa		52
Shear Modulus, GPa		31

Tensile Strength: Ultimate (UTS), MPa		490 to 630
Tensile Strength: Ultimate (UTS), MPa		350 to 760

Thermal Properties

Latent Heat of Fusion, J/g		240
Latent Heat of Fusion, J/g		140

Melting Completion (Liquidus), °C		1180
Melting Completion (Liquidus), °C		780

Melting Onset (Solidus), °C		1120
Melting Onset (Solidus), °C		780

Specific Heat Capacity, J/kg-K		410
Specific Heat Capacity, J/kg-K		280

Thermal Expansion, µm/m-K		15
Thermal Expansion, µm/m-K		19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		7.0
Electrical Conductivity: Equal Volume, % IACS		84

Electrical Conductivity: Equal Weight (Specific), % IACS		7.1
Electrical Conductivity: Equal Weight (Specific), % IACS		75

Otherwise Unclassified Properties

Density, g/cm³		8.9
Density, g/cm³		10

Common Calculations

Stiffness to Weight: Axial, points		8.7
Stiffness to Weight: Axial, points		4.6

Stiffness to Weight: Bending, points		20
Stiffness to Weight: Bending, points		14

Strength to Weight: Axial, points		15 to 20
Strength to Weight: Axial, points		9.5 to 21

Strength to Weight: Bending, points		16 to 18
Strength to Weight: Bending, points		11 to 18

Thermal Shock Resistance, points		16 to 21
Thermal Shock Resistance, points		16 to 34

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), %		26.6 to 29

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 to 0.010

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.030

Silver (Ag), %		0
Silver (Ag), %		71 to 73

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

Residuals, %		0
Residuals, %		0 to 0.21