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443.0 Aluminum vs. 90-platinum 10-iridium

443.0 aluminum belongs to the aluminum alloys classification, while 90-platinum 10-iridium belongs to the otherwise unclassified metals. There are 15 material properties with values for both materials. Properties with values for just one material (17, 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 443.0 aluminum and the bottom bar is 90-platinum 10-iridium.

443.0 (443.0-F, LM18, S5B, A04430) Cast Aluminum90-Platinum 10-Iridium Electrical Contact Alloy
Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 5.6
5.5 to 34
Poisson's Ratio 0.33
0.38
Shear Modulus, GPa 27
74
Shear Strength, MPa 96
220 to 320
Tensile Strength: Ultimate (UTS), MPa 150
330 to 550

Thermal Properties

Latent Heat of Fusion, J/g 470
100
Specific Heat Capacity, J/kg-K 900
130
Thermal Expansion, µm/m-K 22
8.6

Otherwise Unclassified Properties

Density, g/cm3 2.7
22

Common Calculations

Stiffness to Weight: Axial, points 15
5.3
Stiffness to Weight: Bending, points 52
9.1
Strength to Weight: Axial, points 16
4.2 to 7.1
Strength to Weight: Bending, points 23
4.9 to 6.9
Thermal Shock Resistance, points 6.9
13 to 22

Alloy Composition

Aluminum (Al), % 90.7 to 95.5
0
Chromium (Cr), % 0 to 0.25
0
Copper (Cu), % 0 to 0.6
0
Iridium (Ir), % 0
9.5 to 10.5
Iron (Fe), % 0 to 0.8
0
Magnesium (Mg), % 0 to 0.050
0
Manganese (Mn), % 0 to 0.5
0
Platinum (Pt), % 0
89.3 to 90.5
Silicon (Si), % 4.5 to 6.0
0
Titanium (Ti), % 0 to 0.25
0
Zinc (Zn), % 0 to 0.5
0
Residuals, % 0
0 to 0.2