ASTM B522 Class I vs. R05255 Alloy

Both ASTM B522 class I and R05255 alloy are otherwise unclassified metals. 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 B522 class I and the bottom bar is R05255 alloy.

ASTM B522 Class I Gold-Silver-Platinum Electrical Contact Alloy UNS R05255 Tantalum-Tungsten Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		96
Elastic (Young's, Tensile) Modulus, GPa		190

Elongation at Break, %		1.1 to 29
Elongation at Break, %		20

Poisson's Ratio		0.41
Poisson's Ratio		0.34

Shear Modulus, GPa		34
Shear Modulus, GPa		70

Tensile Strength: Ultimate (UTS), MPa		280 to 490
Tensile Strength: Ultimate (UTS), MPa		540

Tensile Strength: Yield (Proof), MPa		120 to 210
Tensile Strength: Yield (Proof), MPa		450

Thermal Properties

Latent Heat of Fusion, J/g		77
Latent Heat of Fusion, J/g		140

Specific Heat Capacity, J/kg-K		160
Specific Heat Capacity, J/kg-K		140

Thermal Expansion, µm/m-K		15
Thermal Expansion, µm/m-K		6.6

Otherwise Unclassified Properties

Density, g/cm³		17
Density, g/cm³		17

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		4.5 to 64
Resilience: Ultimate (Unit Rupture Work), MJ/m³		100

Resilience: Unit (Modulus of Resilience), kJ/m³		75 to 230
Resilience: Unit (Modulus of Resilience), kJ/m³		530

Stiffness to Weight: Axial, points		3.1
Stiffness to Weight: Axial, points		6.3

Stiffness to Weight: Bending, points		8.9
Stiffness to Weight: Bending, points		11

Strength to Weight: Axial, points		4.4 to 7.8
Strength to Weight: Axial, points		9.1

Strength to Weight: Bending, points		5.5 to 8.0
Strength to Weight: Bending, points		8.9

Thermal Shock Resistance, points		13 to 24
Thermal Shock Resistance, points		31

Alloy Composition

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

Gold (Au), %		68 to 70
Gold (Au), %		0

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

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

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

Nickel (Ni), %		0
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

Platinum (Pt), %		5.0 to 7.0
Platinum (Pt), %		0

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

Silver (Ag), %		23.5 to 26.5
Silver (Ag), %		0

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

Residuals, %		0 to 0.35
Residuals, %		0