ASTM B477 Au-Ni-Ag vs. C84400 Valve Metal

ASTM B477 Au-Ni-Ag belongs to the otherwise unclassified metals classification, while C84400 valve metal belongs to the copper alloys. There are 18 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 ASTM B477 Au-Ni-Ag and the bottom bar is C84400 valve metal.

ASTM B477 Gold-Nickel-Silver Electrical Contact Alloy UNS C84400 (Alloy 5A) Valve Metal

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		95
Elastic (Young's, Tensile) Modulus, GPa		100

Elongation at Break, %		5.5 to 11
Elongation at Break, %		19

Poisson's Ratio		0.41
Poisson's Ratio		0.34

Shear Modulus, GPa		34
Shear Modulus, GPa		39

Tensile Strength: Ultimate (UTS), MPa		310 to 550
Tensile Strength: Ultimate (UTS), MPa		230

Thermal Properties

Latent Heat of Fusion, J/g		80
Latent Heat of Fusion, J/g		180

Melting Completion (Liquidus), °C		1010
Melting Completion (Liquidus), °C		1000

Melting Onset (Solidus), °C		930
Melting Onset (Solidus), °C		840

Specific Heat Capacity, J/kg-K		160
Specific Heat Capacity, J/kg-K		370

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

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		14
Electrical Conductivity: Equal Volume, % IACS		16

Electrical Conductivity: Equal Weight (Specific), % IACS		7.5
Electrical Conductivity: Equal Weight (Specific), % IACS		17

Otherwise Unclassified Properties

Density, g/cm³		17
Density, g/cm³		8.8

Common Calculations

Stiffness to Weight: Axial, points		3.1
Stiffness to Weight: Axial, points		6.6

Stiffness to Weight: Bending, points		8.9
Stiffness to Weight: Bending, points		18

Strength to Weight: Axial, points		5.0 to 9.0
Strength to Weight: Axial, points		7.2

Strength to Weight: Bending, points		6.0 to 8.8
Strength to Weight: Bending, points		9.4

Thermal Shock Resistance, points		16 to 28
Thermal Shock Resistance, points		8.3

Alloy Composition

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

Antimony (Sb), %		0
Antimony (Sb), %		0 to 0.25

Copper (Cu), %		0
Copper (Cu), %		78 to 82

Gold (Au), %		74.2 to 75.8
Gold (Au), %		0

Iron (Fe), %		0
Iron (Fe), %		0 to 0.4

Lead (Pb), %		0
Lead (Pb), %		6.0 to 8.0

Nickel (Ni), %		2.6 to 3.4
Nickel (Ni), %		0 to 1.0

Phosphorus (P), %		0
Phosphorus (P), %		0 to 1.5

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

Silver (Ag), %		21.4 to 22.6
Silver (Ag), %		0

Sulfur (S), %		0
Sulfur (S), %		0 to 0.080

Tin (Sn), %		0
Tin (Sn), %		2.3 to 3.5

Zinc (Zn), %		0
Zinc (Zn), %		7.0 to 10

Residuals, %		0
Residuals, %		0 to 0.7