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Solder Alloy 702 vs. AWS BAu-2

Both solder alloy 702 and AWS BAu-2 are otherwise unclassified metals. Both are furnished in the as-fabricated (no temper or treatment) condition. There are 15 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is solder alloy 702 and the bottom bar is AWS BAu-2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 51
100
Poisson's Ratio 0.36
0.4
Shear Modulus, GPa 19
36
Tensile Strength: Ultimate (UTS), MPa 53
150

Thermal Properties

Latent Heat of Fusion, J/g 61
92
Melting Completion (Liquidus), °C 220
890
Melting Onset (Solidus), °C 220
890
Specific Heat Capacity, J/kg-K 220
180
Thermal Expansion, µm/m-K 22
15

Otherwise Unclassified Properties

Density, g/cm3 7.4
17

Common Calculations

Stiffness to Weight: Axial, points 3.8
3.3
Stiffness to Weight: Bending, points 17
9.1
Strength to Weight: Axial, points 2.0
2.4
Strength to Weight: Bending, points 4.2
3.6
Thermal Shock Resistance, points 3.4
7.1

Alloy Composition


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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
Copper (Cu), % 0 to 0.050
19.4 to 20.5
Gold (Au), % 0 to 0.050
79.5 to 80.5
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
0
Lead (Pb), % 0 to 0.070
0
Nickel (Ni), % 0 to 0.010
0
Silver (Ag), % 2.8 to 3.2
0
Tin (Sn), % 96.3 to 97.2
0
Zinc (Zn), % 0 to 0.0010
0
Residuals, % 0
0 to 0.15