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R05255 Alloy vs. ASTM B617 Coin Silver

Both R05255 alloy and ASTM B617 coin silver are otherwise unclassified metals. There are 14 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is R05255 alloy and the bottom bar is ASTM B617 coin silver.

UNS R05255 Tantalum-Tungsten AlloyASTM B617 Coin Silver Electrical Contact Alloy
Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
75
Elongation at Break, % 20
1.1 to 22
Poisson's Ratio 0.34
0.37
Shear Modulus, GPa 70
28
Tensile Strength: Ultimate (UTS), MPa 540
290 to 520

Thermal Properties

Latent Heat of Fusion, J/g 140
120
Specific Heat Capacity, J/kg-K 140
250
Thermal Expansion, µm/m-K 6.6
19

Otherwise Unclassified Properties

Density, g/cm3 17
10

Common Calculations

Stiffness to Weight: Axial, points 6.3
4.1
Stiffness to Weight: Bending, points 11
14
Strength to Weight: Axial, points 9.1
7.7 to 14
Strength to Weight: Bending, points 8.9
9.3 to 14
Thermal Shock Resistance, points 31
14 to 25

Alloy Composition

Aluminum (Al), % 0
0 to 0.0050
Cadmium (Cd), % 0
0 to 0.050
Carbon (C), % 0 to 0.010
0
Copper (Cu), % 0
9.0 to 10.4
Hydrogen (H), % 0 to 0.0015
0
Iron (Fe), % 0 to 0.010
0 to 0.050
Lead (Pb), % 0
0 to 0.030
Molybdenum (Mo), % 0 to 0.020
0
Nickel (Ni), % 0 to 0.010
0 to 0.010
Niobium (Nb), % 0 to 0.5
0
Nitrogen (N), % 0 to 0.010
0
Oxygen (O), % 0 to 0.015
0
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 0.0050
0
Silver (Ag), % 0
89.6 to 91
Tantalum (Ta), % 95.9 to 98
0
Titanium (Ti), % 0 to 0.010
0
Tungsten (W), % 2.0 to 3.5
0
Zinc (Zn), % 0
0 to 0.060
Residuals, % 0
0 to 0.060