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EN AC-21100 Aluminum vs. ASTM B685 Alloy

EN AC-21100 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 EN AC-21100 aluminum and the bottom bar is ASTM B685 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
120
Poisson's Ratio 0.33
0.37
Shear Modulus, GPa 27
43
Tensile Strength: Ultimate (UTS), MPa 340 to 350
660 to 1060

Thermal Properties

Latent Heat of Fusion, J/g 390
180
Melting Completion (Liquidus), °C 670
1230
Melting Onset (Solidus), °C 550
1200
Specific Heat Capacity, J/kg-K 880
300
Thermal Expansion, µm/m-K 23
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 34
5.0
Electrical Conductivity: Equal Weight (Specific), % IACS 100
4.1

Otherwise Unclassified Properties

Density, g/cm3 3.0
11

Common Calculations

Stiffness to Weight: Axial, points 13
6.1
Stiffness to Weight: Bending, points 46
15
Strength to Weight: Axial, points 31 to 33
17 to 27
Strength to Weight: Bending, points 36 to 37
16 to 21
Thermal Shock Resistance, points 15
28 to 46

Alloy Composition

Aluminum (Al), % 93.4 to 95.7
0 to 0.0050
Cadmium (Cd), % 0
0 to 0.050
Copper (Cu), % 4.2 to 5.2
39.5 to 40.5
Iron (Fe), % 0 to 0.19
0 to 0.050
Lead (Pb), % 0
0 to 0.030
Manganese (Mn), % 0 to 0.55
0
Palladium (Pd), % 0
59 to 60.5
Silicon (Si), % 0 to 0.18
0
Silver (Ag), % 0
0 to 0.1
Titanium (Ti), % 0.15 to 0.3
0
Zinc (Zn), % 0 to 0.070
0 to 0.060
Residuals, % 0
0 to 0.2