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R05255 Alloy vs. R05400 Tantalum

Both R05255 alloy and R05400 tantalum are otherwise unclassified metals. They have a very high 97% of their average alloy composition in common.

For each property being compared, the top bar is R05255 alloy and the bottom bar is R05400 tantalum.

UNS R05255 Tantalum-Tungsten AlloyUNS R05400 Sintered Unalloyed Tantalum
Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
1.1 to 28
Poisson's Ratio 0.34
0.34
Shear Modulus, GPa 70
69
Tensile Strength: Ultimate (UTS), MPa 540
210 to 540
Tensile Strength: Yield (Proof), MPa 450
140 to 390

Thermal Properties

Latent Heat of Fusion, J/g 140
140
Specific Heat Capacity, J/kg-K 140
140
Thermal Conductivity, W/m-K 59
59
Thermal Expansion, µm/m-K 6.6
6.5

Otherwise Unclassified Properties

Density, g/cm3 17
17
Embodied Water, L/kg 630
650

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
5.5 to 53
Resilience: Unit (Modulus of Resilience), kJ/m3 530
50 to 420
Stiffness to Weight: Axial, points 6.3
6.2
Stiffness to Weight: Bending, points 11
11
Strength to Weight: Axial, points 9.1
3.6 to 9.0
Strength to Weight: Bending, points 8.9
4.8 to 8.8
Thermal Diffusivity, mm2/s 25
25
Thermal Shock Resistance, points 31
13 to 32

Alloy Composition

Carbon (C), % 0 to 0.010
0 to 0.010
Hydrogen (H), % 0 to 0.0015
0 to 0.0015
Iron (Fe), % 0 to 0.010
0 to 0.010
Molybdenum (Mo), % 0 to 0.020
0 to 0.020
Nickel (Ni), % 0 to 0.010
0 to 0.010
Niobium (Nb), % 0 to 0.5
0 to 0.1
Nitrogen (N), % 0 to 0.010
0 to 0.010
Oxygen (O), % 0 to 0.015
0 to 0.030
Silicon (Si), % 0 to 0.0050
0 to 0.0050
Tantalum (Ta), % 95.9 to 98
99.7 to 100
Titanium (Ti), % 0 to 0.010
0 to 0.010
Tungsten (W), % 2.0 to 3.5
0 to 0.050