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6065 Aluminum vs. Solder Alloy 721

6065 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 (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 6065 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, % 4.5 to 11
17
Poisson's Ratio 0.33
0.36
Shear Modulus, GPa 26
19
Tensile Strength: Ultimate (UTS), MPa 310 to 400
50

Thermal Properties

Latent Heat of Fusion, J/g 400
61
Melting Completion (Liquidus), °C 640
220
Melting Onset (Solidus), °C 590
210
Specific Heat Capacity, J/kg-K 890
220
Thermal Conductivity, W/m-K 170
56
Thermal Expansion, µm/m-K 23
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 43
14
Electrical Conductivity: Equal Weight (Specific), % IACS 140
17

Otherwise Unclassified Properties

Density, g/cm3 2.8
7.4
Embodied Carbon, kg CO2/kg material 8.4
17
Embodied Energy, MJ/kg 150
280

Common Calculations

Stiffness to Weight: Axial, points 14
3.8
Stiffness to Weight: Bending, points 49
17
Strength to Weight: Axial, points 31 to 40
1.9
Strength to Weight: Bending, points 36 to 43
4.1
Thermal Diffusivity, mm2/s 67
34
Thermal Shock Resistance, points 14 to 18
3.2

Alloy Composition

Aluminum (Al), % 94.4 to 98.2
0 to 0.0010
Antimony (Sb), % 0
0 to 0.1
Arsenic (As), % 0
0 to 0.030
Bismuth (Bi), % 0.5 to 1.5
0.8 to 1.2
Cadmium (Cd), % 0
0 to 0.0020
Chromium (Cr), % 0 to 0.15
0
Copper (Cu), % 0.15 to 0.4
0.3 to 0.7
Gold (Au), % 0
0 to 0.050
Indium (In), % 0
0 to 0.1
Iron (Fe), % 0 to 0.7
0 to 0.020
Lead (Pb), % 0 to 0.050
0 to 0.070
Magnesium (Mg), % 0.8 to 1.2
0
Manganese (Mn), % 0 to 0.15
0
Nickel (Ni), % 0
0 to 0.010
Silicon (Si), % 0.4 to 0.8
0
Silver (Ag), % 0
2.3 to 2.7
Tin (Sn), % 0
95 to 96.6
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 0 to 0.25
0 to 0.0010
Zirconium (Zr), % 0 to 0.15
0
Residuals, % 0 to 0.15
0