R05255 Alloy vs. R05240 Alloy

Both R05255 alloy and R05240 alloy are otherwise unclassified metals. Both are furnished in the annealed condition. They have 62% of their average alloy composition in common. There are 18 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is R05255 alloy and the bottom bar is R05240 alloy.

UNS R05255 Tantalum-Tungsten Alloy UNS R05240 Tantalum-Niobium Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		190
Elastic (Young's, Tensile) Modulus, GPa		150

Elongation at Break, %		20
Elongation at Break, %		25

Poisson's Ratio		0.34
Poisson's Ratio		0.36

Shear Modulus, GPa		70
Shear Modulus, GPa		57

Tensile Strength: Ultimate (UTS), MPa		540
Tensile Strength: Ultimate (UTS), MPa		270

Tensile Strength: Yield (Proof), MPa		450
Tensile Strength: Yield (Proof), MPa		170

Thermal Properties

Latent Heat of Fusion, J/g		140
Latent Heat of Fusion, J/g		210

Specific Heat Capacity, J/kg-K		140
Specific Heat Capacity, J/kg-K		190

Thermal Expansion, µm/m-K		6.6
Thermal Expansion, µm/m-K		6.8

Otherwise Unclassified Properties

Density, g/cm³		17
Density, g/cm³		14

Embodied Water, L/kg		630
Embodied Water, L/kg		460

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		100
Resilience: Ultimate (Unit Rupture Work), MJ/m³		59

Resilience: Unit (Modulus of Resilience), kJ/m³		530
Resilience: Unit (Modulus of Resilience), kJ/m³		90

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

Stiffness to Weight: Bending, points		11
Stiffness to Weight: Bending, points		13

Strength to Weight: Axial, points		9.1
Strength to Weight: Axial, points		5.4

Strength to Weight: Bending, points		8.9
Strength to Weight: Bending, points		6.8

Thermal Shock Resistance, points		31
Thermal Shock Resistance, points		18

Alloy Composition

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

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

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

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

Nickel (Ni), %		0 to 0.010
Nickel (Ni), %		0 to 0.010

Niobium (Nb), %		0 to 0.5
Niobium (Nb), %		35 to 42

Nitrogen (N), %		0 to 0.010
Nitrogen (N), %		0 to 0.010

Oxygen (O), %		0 to 0.015
Oxygen (O), %		0 to 0.020

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

Tantalum (Ta), %		95.9 to 98
Tantalum (Ta), %		57.9 to 65

Titanium (Ti), %		0 to 0.010
Titanium (Ti), %		0 to 0.010

Tungsten (W), %		2.0 to 3.5
Tungsten (W), %		0 to 0.050