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1070A Aluminum vs. Solder Alloy 721

1070A aluminum belongs to the aluminum alloys classification, while solder alloy 721 belongs to the otherwise unclassified metals. There are 22 material properties with values for both materials. Properties with values for just one material (9, 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 1070A aluminum and the bottom bar is solder alloy 721.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
51
Elongation at Break, % 2.3 to 33
17
Poisson's Ratio 0.33
0.36
Shear Modulus, GPa 26
19
Tensile Strength: Ultimate (UTS), MPa 68 to 140
50

Thermal Properties

Latent Heat of Fusion, J/g 400
61
Melting Completion (Liquidus), °C 640
220
Melting Onset (Solidus), °C 640
210
Specific Heat Capacity, J/kg-K 900
220
Thermal Conductivity, W/m-K 230
56
Thermal Expansion, µm/m-K 23
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 60
14
Electrical Conductivity: Equal Weight (Specific), % IACS 200
17

Otherwise Unclassified Properties

Density, g/cm3 2.7
7.4
Embodied Carbon, kg CO2/kg material 8.2
17
Embodied Energy, MJ/kg 150
280

Common Calculations

Stiffness to Weight: Axial, points 14
3.8
Stiffness to Weight: Bending, points 50
17
Strength to Weight: Axial, points 7.0 to 14
1.9
Strength to Weight: Bending, points 14 to 22
4.1
Thermal Diffusivity, mm2/s 94
34
Thermal Shock Resistance, points 3.1 to 6.3
3.2

Alloy Composition

Aluminum (Al), % 99.7 to 100
0 to 0.0010
Antimony (Sb), % 0
0 to 0.1
Arsenic (As), % 0
0 to 0.030
Bismuth (Bi), % 0
0.8 to 1.2
Cadmium (Cd), % 0
0 to 0.0020
Copper (Cu), % 0 to 0.030
0.3 to 0.7
Gold (Au), % 0
0 to 0.050
Indium (In), % 0
0 to 0.1
Iron (Fe), % 0 to 0.25
0 to 0.020
Lead (Pb), % 0
0 to 0.070
Magnesium (Mg), % 0 to 0.030
0
Manganese (Mn), % 0 to 0.030
0
Nickel (Ni), % 0
0 to 0.010
Silicon (Si), % 0 to 0.2
0
Silver (Ag), % 0
2.3 to 2.7
Tin (Sn), % 0
95 to 96.6
Titanium (Ti), % 0 to 0.030
0
Zinc (Zn), % 0 to 0.070
0 to 0.0010