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R31539 Cobalt vs. Solder Alloy 702

R31539 cobalt belongs to the cobalt alloys classification, while solder alloy 702 belongs to the otherwise unclassified metals. There are 22 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is solder alloy 702.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
51
Elongation at Break, % 13 to 22
21
Poisson's Ratio 0.29
0.36
Shear Modulus, GPa 86
19
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
53

Thermal Properties

Latent Heat of Fusion, J/g 320
61
Melting Completion (Liquidus), °C 1360
220
Melting Onset (Solidus), °C 1290
220
Specific Heat Capacity, J/kg-K 450
220
Thermal Conductivity, W/m-K 13
62
Thermal Expansion, µm/m-K 13
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
15
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
18

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.4
Embodied Carbon, kg CO2/kg material 8.2
17
Embodied Energy, MJ/kg 110
290

Common Calculations

Stiffness to Weight: Axial, points 15
3.8
Stiffness to Weight: Bending, points 24
17
Strength to Weight: Axial, points 33 to 44
2.0
Strength to Weight: Bending, points 27 to 32
4.2
Thermal Diffusivity, mm2/s 3.5
38
Thermal Shock Resistance, points 24 to 32
3.4

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0 to 0.0010
Antimony (Sb), % 0
0 to 0.1
Arsenic (As), % 0
0 to 0.030
Bismuth (Bi), % 0
0 to 0.1
Cadmium (Cd), % 0
0 to 0.0020
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 0.050
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
0 to 0.070
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
2.8 to 3.2
Tin (Sn), % 0
96.3 to 97.2
Zinc (Zn), % 0
0 to 0.0010