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Solder Alloy 721 vs. AWS BNi-5a

Solder alloy 721 belongs to the otherwise unclassified metals classification, while AWS BNi-5a belongs to the nickel alloys. There are 17 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 721 and the bottom bar is AWS BNi-5a.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 51
190
Poisson's Ratio 0.36
0.29
Shear Modulus, GPa 19
72
Tensile Strength: Ultimate (UTS), MPa 50
480

Thermal Properties

Latent Heat of Fusion, J/g 61
420
Melting Completion (Liquidus), °C 220
1150
Melting Onset (Solidus), °C 210
1070
Specific Heat Capacity, J/kg-K 220
500
Thermal Expansion, µm/m-K 22
12

Otherwise Unclassified Properties

Density, g/cm3 7.4
7.9
Embodied Carbon, kg CO2/kg material 17
9.0
Embodied Energy, MJ/kg 280
130

Common Calculations

Stiffness to Weight: Axial, points 3.8
13
Stiffness to Weight: Bending, points 17
24
Strength to Weight: Axial, points 1.9
17
Strength to Weight: Bending, points 4.1
17
Thermal Shock Resistance, points 3.2
15

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0 to 0.050
Antimony (Sb), % 0 to 0.1
0
Arsenic (As), % 0 to 0.030
0
Bismuth (Bi), % 0.8 to 1.2
0
Boron (B), % 0
1.0 to 1.5
Cadmium (Cd), % 0 to 0.0020
0
Carbon (C), % 0
0 to 0.1
Chromium (Cr), % 0
18.5 to 19.5
Cobalt (Co), % 0
0 to 0.1
Copper (Cu), % 0.3 to 0.7
0
Gold (Au), % 0 to 0.050
0
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
0 to 0.5
Lead (Pb), % 0 to 0.070
0
Nickel (Ni), % 0 to 0.010
70.1 to 73.5
Phosphorus (P), % 0
0 to 0.020
Selenium (Se), % 0
0 to 0.0050
Silicon (Si), % 0
7.0 to 7.5
Silver (Ag), % 2.3 to 2.7
0
Sulfur (S), % 0
0 to 0.020
Tin (Sn), % 95 to 96.6
0
Titanium (Ti), % 0
0 to 0.050
Zinc (Zn), % 0 to 0.0010
0
Zirconium (Zr), % 0
0 to 0.050
Residuals, % 0
0 to 0.5