R05255 Alloy vs. R04295 Alloy

Both R05255 alloy and R04295 alloy are otherwise unclassified metals. Both are furnished in the annealed condition. 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 R04295 alloy.

UNS R05255 Tantalum-Tungsten Alloy UNS R04295 Niobium-Hafnium Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		190
Elastic (Young's, Tensile) Modulus, GPa		100

Elongation at Break, %		20
Elongation at Break, %		22

Poisson's Ratio		0.34
Poisson's Ratio		0.38

Shear Modulus, GPa		70
Shear Modulus, GPa		37

Tensile Strength: Ultimate (UTS), MPa		540
Tensile Strength: Ultimate (UTS), MPa		410

Tensile Strength: Yield (Proof), MPa		450
Tensile Strength: Yield (Proof), MPa		300

Thermal Properties

Latent Heat of Fusion, J/g		140
Latent Heat of Fusion, J/g		300

Specific Heat Capacity, J/kg-K		140
Specific Heat Capacity, J/kg-K		260

Thermal Expansion, µm/m-K		6.6
Thermal Expansion, µm/m-K		7.2

Otherwise Unclassified Properties

Density, g/cm³		17
Density, g/cm³		9.0

Embodied Water, L/kg		630
Embodied Water, L/kg		950

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		100
Resilience: Ultimate (Unit Rupture Work), MJ/m³		84

Resilience: Unit (Modulus of Resilience), kJ/m³		530
Resilience: Unit (Modulus of Resilience), kJ/m³		430

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		17

Strength to Weight: Axial, points		9.1
Strength to Weight: Axial, points		13

Strength to Weight: Bending, points		8.9
Strength to Weight: Bending, points		14

Thermal Shock Resistance, points		31
Thermal Shock Resistance, points		40

Alloy Composition

Carbon (C), %		0 to 0.010
Carbon (C), %		0 to 0.015

Hafnium (Hf), %		0
Hafnium (Hf), %		9.0 to 11

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

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

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

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

Niobium (Nb), %		0 to 0.5
Niobium (Nb), %		85.9 to 90.3

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

Oxygen (O), %		0 to 0.015
Oxygen (O), %		0 to 0.025

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

Tantalum (Ta), %		95.9 to 98
Tantalum (Ta), %		0 to 0.5

Titanium (Ti), %		0 to 0.010
Titanium (Ti), %		0.7 to 1.3

Tungsten (W), %		2.0 to 3.5
Tungsten (W), %		0 to 0.5

Zirconium (Zr), %		0
Zirconium (Zr), %		0 to 0.7