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4145 Aluminum vs. 85-platinum 15-iridium

4145 aluminum belongs to the aluminum alloys classification, while 85-platinum 15-iridium belongs to the otherwise unclassified metals. There are 19 material properties with values for both materials. Properties with values for just one material (12, 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 4145 aluminum and the bottom bar is 85-platinum 15-iridium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
220
Elongation at Break, % 2.2
5.5 to 34
Poisson's Ratio 0.33
0.38
Shear Modulus, GPa 28
81
Shear Strength, MPa 69
370 to 420
Tensile Strength: Ultimate (UTS), MPa 120
560 to 730

Thermal Properties

Latent Heat of Fusion, J/g 540
110
Melting Completion (Liquidus), °C 590
1820
Melting Onset (Solidus), °C 520
1790
Specific Heat Capacity, J/kg-K 880
130
Thermal Expansion, µm/m-K 21
8.4

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
6.2
Electrical Conductivity: Equal Weight (Specific), % IACS 84
2.6

Otherwise Unclassified Properties

Density, g/cm3 2.8
22

Common Calculations

Stiffness to Weight: Axial, points 14
5.7
Stiffness to Weight: Bending, points 50
9.3
Strength to Weight: Axial, points 12
7.1 to 9.3
Strength to Weight: Bending, points 19
6.9 to 8.3
Thermal Shock Resistance, points 5.5
21 to 28

Alloy Composition

Aluminum (Al), % 83 to 87.4
0
Chromium (Cr), % 0 to 0.15
0
Copper (Cu), % 3.3 to 4.7
0
Iridium (Ir), % 0
14.5 to 15.5
Iron (Fe), % 0 to 0.8
0
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0
Platinum (Pt), % 0
84.3 to 85.5
Silicon (Si), % 9.3 to 10.7
0
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0
0 to 0.2