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Solder Alloy 715 vs. R30021 Cobalt

Solder alloy 715 belongs to the otherwise unclassified metals classification, while R30021 cobalt belongs to the cobalt alloys. There are 22 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 solder alloy 715 and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 51
220
Elongation at Break, % 21
9.0
Poisson's Ratio 0.36
0.29
Shear Modulus, GPa 19
86
Tensile Strength: Ultimate (UTS), MPa 30
700

Thermal Properties

Latent Heat of Fusion, J/g 61
330
Melting Completion (Liquidus), °C 220
1350
Melting Onset (Solidus), °C 220
1190
Specific Heat Capacity, J/kg-K 220
450
Thermal Conductivity, W/m-K 60
15
Thermal Expansion, µm/m-K 22
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 15
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.3
8.4
Embodied Carbon, kg CO2/kg material 16
8.0
Embodied Energy, MJ/kg 270
110

Common Calculations

Stiffness to Weight: Axial, points 3.8
15
Stiffness to Weight: Bending, points 17
24
Strength to Weight: Axial, points 1.1
23
Strength to Weight: Bending, points 2.9
21
Thermal Diffusivity, mm2/s 37
3.8
Thermal Shock Resistance, points 1.9
21

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0
Antimony (Sb), % 0 to 0.1
0
Arsenic (As), % 0 to 0.030
0
Bismuth (Bi), % 0 to 0.1
0
Cadmium (Cd), % 0 to 0.0020
0
Carbon (C), % 0
0.2 to 0.35
Chromium (Cr), % 0
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Copper (Cu), % 0.5 to 0.9
0
Gold (Au), % 0 to 0.050
0
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
0 to 3.0
Lead (Pb), % 0 to 0.070
0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 0 to 0.010
2.0 to 3.0
Silicon (Si), % 0
0 to 1.5
Silver (Ag), % 0.8 to 1.2
0
Tin (Sn), % 97.4 to 98.7
0
Zinc (Zn), % 0 to 0.0010
0