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Solder Alloy 721 vs. AWS ENiCu-7

Solder alloy 721 belongs to the otherwise unclassified metals classification, while AWS ENiCu-7 belongs to the nickel alloys. There are 22 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is solder alloy 721 and the bottom bar is AWS ENiCu-7.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 51
160
Elongation at Break, % 17
34
Poisson's Ratio 0.36
0.32
Shear Modulus, GPa 19
62
Tensile Strength: Ultimate (UTS), MPa 50
550

Thermal Properties

Latent Heat of Fusion, J/g 61
280
Melting Completion (Liquidus), °C 220
1270
Melting Onset (Solidus), °C 210
1230
Specific Heat Capacity, J/kg-K 220
430
Thermal Conductivity, W/m-K 56
21
Thermal Expansion, µm/m-K 22
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 14
3.3
Electrical Conductivity: Equal Weight (Specific), % IACS 17
3.3

Otherwise Unclassified Properties

Density, g/cm3 7.4
8.7
Embodied Carbon, kg CO2/kg material 17
8.0
Embodied Energy, MJ/kg 280
110

Common Calculations

Stiffness to Weight: Axial, points 3.8
10
Stiffness to Weight: Bending, points 17
21
Strength to Weight: Axial, points 1.9
17
Strength to Weight: Bending, points 4.1
17
Thermal Diffusivity, mm2/s 34
5.5
Thermal Shock Resistance, points 3.2
18

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0 to 0.75
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
Copper (Cu), % 0.3 to 0.7
20.6 to 38
Gold (Au), % 0 to 0.050
0
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
0 to 2.5
Lead (Pb), % 0 to 0.070
0
Manganese (Mn), % 0
0 to 4.0
Nickel (Ni), % 0 to 0.010
62 to 69
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0
0 to 1.5
Silver (Ag), % 2.3 to 2.7
0
Sulfur (S), % 0
0 to 0.015
Tin (Sn), % 95 to 96.6
0
Titanium (Ti), % 0
0 to 1.0
Zinc (Zn), % 0 to 0.0010
0
Residuals, % 0
0 to 0.5