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7049 Aluminum vs. Solder Alloy 702

7049 aluminum belongs to the aluminum alloys classification, while solder alloy 702 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 7049 aluminum and the bottom bar is solder alloy 702.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
51
Elongation at Break, % 6.2 to 7.0
21
Poisson's Ratio 0.32
0.36
Shear Modulus, GPa 27
19
Tensile Strength: Ultimate (UTS), MPa 510 to 530
53

Thermal Properties

Latent Heat of Fusion, J/g 370
61
Melting Completion (Liquidus), °C 640
220
Melting Onset (Solidus), °C 480
220
Specific Heat Capacity, J/kg-K 860
220
Thermal Conductivity, W/m-K 130
62
Thermal Expansion, µm/m-K 23
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 36
15
Electrical Conductivity: Equal Weight (Specific), % IACS 110
18

Otherwise Unclassified Properties

Density, g/cm3 3.1
7.4
Embodied Carbon, kg CO2/kg material 8.1
17
Embodied Energy, MJ/kg 140
290

Common Calculations

Stiffness to Weight: Axial, points 13
3.8
Stiffness to Weight: Bending, points 45
17
Strength to Weight: Axial, points 46 to 47
2.0
Strength to Weight: Bending, points 46 to 47
4.2
Thermal Diffusivity, mm2/s 51
38
Thermal Shock Resistance, points 22 to 23
3.4

Alloy Composition

Aluminum (Al), % 85.7 to 89.5
0 to 0.0010
Antimony (Sb), % 0
0 to 0.1
Arsenic (As), % 0
0 to 0.030
Bismuth (Bi), % 0
0 to 0.1
Cadmium (Cd), % 0
0 to 0.0020
Chromium (Cr), % 0.1 to 0.22
0
Copper (Cu), % 1.2 to 1.9
0 to 0.050
Gold (Au), % 0
0 to 0.050
Indium (In), % 0
0 to 0.1
Iron (Fe), % 0 to 0.35
0 to 0.020
Lead (Pb), % 0
0 to 0.070
Magnesium (Mg), % 2.0 to 2.9
0
Manganese (Mn), % 0 to 0.2
0
Nickel (Ni), % 0
0 to 0.010
Silicon (Si), % 0 to 0.25
0
Silver (Ag), % 0
2.8 to 3.2
Tin (Sn), % 0
96.3 to 97.2
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 7.2 to 8.2
0 to 0.0010
Residuals, % 0 to 0.15
0