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Solder Alloy 721 vs. Nickel 601

Solder alloy 721 belongs to the otherwise unclassified metals classification, while nickel 601 belongs to the nickel alloys. There are 22 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is solder alloy 721 and the bottom bar is nickel 601.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 51
200
Elongation at Break, % 17
10 to 38
Poisson's Ratio 0.36
0.28
Shear Modulus, GPa 19
76
Tensile Strength: Ultimate (UTS), MPa 50
660 to 890

Thermal Properties

Latent Heat of Fusion, J/g 61
320
Melting Completion (Liquidus), °C 220
1410
Melting Onset (Solidus), °C 210
1360
Specific Heat Capacity, J/kg-K 220
470
Thermal Conductivity, W/m-K 56
11
Thermal Expansion, µm/m-K 22
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 14
1.5
Electrical Conductivity: Equal Weight (Specific), % IACS 17
1.6

Otherwise Unclassified Properties

Density, g/cm3 7.4
8.3
Embodied Carbon, kg CO2/kg material 17
8.0
Embodied Energy, MJ/kg 280
110

Common Calculations

Stiffness to Weight: Axial, points 3.8
13
Stiffness to Weight: Bending, points 17
23
Strength to Weight: Axial, points 1.9
22 to 30
Strength to Weight: Bending, points 4.1
20 to 25
Thermal Diffusivity, mm2/s 34
2.8
Thermal Shock Resistance, points 3.2
17 to 23

Alloy Composition

Aluminum (Al), % 0 to 0.0010
1.0 to 1.7
Antimony (Sb), % 0 to 0.1
0
Arsenic (As), % 0 to 0.030
0
Bismuth (Bi), % 0.8 to 1.2
0
Cadmium (Cd), % 0 to 0.0020
0
Carbon (C), % 0
0 to 0.1
Chromium (Cr), % 0
21 to 25
Copper (Cu), % 0.3 to 0.7
0 to 1.0
Gold (Au), % 0 to 0.050
0
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
7.7 to 20
Lead (Pb), % 0 to 0.070
0
Manganese (Mn), % 0
0 to 1.0
Nickel (Ni), % 0 to 0.010
58 to 63
Silicon (Si), % 0
0 to 0.5
Silver (Ag), % 2.3 to 2.7
0
Sulfur (S), % 0
0 to 0.015
Tin (Sn), % 95 to 96.6
0
Zinc (Zn), % 0 to 0.0010
0