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R31539 Cobalt vs. Solder Alloy 121

R31539 cobalt belongs to the cobalt alloys classification, while solder alloy 121 belongs to the otherwise unclassified metals. There are 23 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is solder alloy 121.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
21
Elongation at Break, % 13 to 22
25
Poisson's Ratio 0.29
0.43
Shear Modulus, GPa 86
7.5
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
32

Thermal Properties

Latent Heat of Fusion, J/g 320
29
Melting Completion (Liquidus), °C 1360
290
Melting Onset (Solidus), °C 1290
230
Specific Heat Capacity, J/kg-K 450
140
Thermal Conductivity, W/m-K 13
31
Thermal Expansion, µm/m-K 13
28

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
8.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
7.4

Otherwise Unclassified Properties

Density, g/cm3 8.4
11
Embodied Carbon, kg CO2/kg material 8.2
5.6
Embodied Energy, MJ/kg 110
93
Embodied Water, L/kg 530
580

Common Calculations

Stiffness to Weight: Axial, points 15
1.1
Stiffness to Weight: Bending, points 24
8.6
Strength to Weight: Axial, points 33 to 44
0.84
Strength to Weight: Bending, points 27 to 32
2.1
Thermal Diffusivity, mm2/s 3.5
20
Thermal Shock Resistance, points 24 to 32
3.9

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0 to 0.0010
Antimony (Sb), % 0
0 to 0.5
Arsenic (As), % 0
0 to 0.030
Bismuth (Bi), % 0
0 to 0.25
Cadmium (Cd), % 0
0 to 0.0050
Carbon (C), % 0 to 0.14
0
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 57.7 to 68.7
0
Copper (Cu), % 0
0 to 0.080
Gold (Au), % 0
0 to 0.050
Indium (In), % 0
0 to 0.1
Iron (Fe), % 0 to 0.75
0 to 0.020
Lanthanum (La), % 0.030 to 0.2
0
Lead (Pb), % 0
83.4 to 85.5
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0 to 0.010
Nitrogen (N), % 0 to 0.25
0
Silicon (Si), % 0 to 1.0
0
Silver (Ag), % 0
0 to 0.1
Tin (Sn), % 0
14.5 to 15.5
Zinc (Zn), % 0
0 to 0.0010