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7003 Aluminum vs. ASTM B685 Alloy

7003 aluminum belongs to the aluminum alloys classification, while ASTM B685 alloy belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (13, 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 7003 aluminum and the bottom bar is ASTM B685 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
120
Poisson's Ratio 0.32
0.37
Shear Modulus, GPa 26
43
Tensile Strength: Ultimate (UTS), MPa 350 to 390
660 to 1060

Thermal Properties

Latent Heat of Fusion, J/g 380
180
Melting Completion (Liquidus), °C 630
1230
Melting Onset (Solidus), °C 510
1200
Specific Heat Capacity, J/kg-K 870
300
Thermal Expansion, µm/m-K 24
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 36
5.0
Electrical Conductivity: Equal Weight (Specific), % IACS 110
4.1

Otherwise Unclassified Properties

Density, g/cm3 2.9
11

Common Calculations

Stiffness to Weight: Axial, points 13
6.1
Stiffness to Weight: Bending, points 47
15
Strength to Weight: Axial, points 33 to 37
17 to 27
Strength to Weight: Bending, points 37 to 40
16 to 21
Thermal Shock Resistance, points 15 to 17
28 to 46

Alloy Composition

Aluminum (Al), % 90.6 to 94.5
0 to 0.0050
Cadmium (Cd), % 0
0 to 0.050
Chromium (Cr), % 0 to 0.2
0
Copper (Cu), % 0 to 0.2
39.5 to 40.5
Iron (Fe), % 0 to 0.35
0 to 0.050
Lead (Pb), % 0
0 to 0.030
Magnesium (Mg), % 0.5 to 1.0
0
Manganese (Mn), % 0 to 0.3
0
Palladium (Pd), % 0
59 to 60.5
Silicon (Si), % 0 to 0.3
0
Silver (Ag), % 0
0 to 0.1
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 5.0 to 6.5
0 to 0.060
Zirconium (Zr), % 0.050 to 0.25
0
Residuals, % 0
0 to 0.2