6101 Aluminum vs. 85-platinum 15-iridium

6101 aluminum belongs to the aluminum alloys classification, while 85-platinum 15-iridium belongs to the otherwise unclassified metals. There are 14 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 6101 aluminum and the bottom bar is 85-platinum 15-iridium.

6101 (E-AlMgSi, 91E) Aluminum 85-Platinum 15-Iridium Electrical Contact Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		68
Elastic (Young's, Tensile) Modulus, GPa		220

Elongation at Break, %		10 to 25
Elongation at Break, %		5.5 to 34

Poisson's Ratio		0.33
Poisson's Ratio		0.38

Shear Modulus, GPa		26
Shear Modulus, GPa		81

Thermal Properties

Latent Heat of Fusion, J/g		400
Latent Heat of Fusion, J/g		110

Melting Completion (Liquidus), °C		650
Melting Completion (Liquidus), °C		1820

Melting Onset (Solidus), °C		620
Melting Onset (Solidus), °C		1790

Specific Heat Capacity, J/kg-K		900
Specific Heat Capacity, J/kg-K		130

Thermal Expansion, µm/m-K		23
Thermal Expansion, µm/m-K		8.4

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		57 to 60
Electrical Conductivity: Equal Volume, % IACS		6.2

Electrical Conductivity: Equal Weight (Specific), % IACS		190 to 200
Electrical Conductivity: Equal Weight (Specific), % IACS		2.6

Otherwise Unclassified Properties

Density, g/cm³		2.7
Density, g/cm³		22

Common Calculations

Stiffness to Weight: Axial, points		14
Stiffness to Weight: Axial, points		5.7

Stiffness to Weight: Bending, points		50
Stiffness to Weight: Bending, points		9.3

Alloy Composition

Aluminum (Al), %		97.6 to 99.4
Aluminum (Al), %		0

Boron (B), %		0 to 0.060
Boron (B), %		0

Chromium (Cr), %		0 to 0.030
Chromium (Cr), %		0

Copper (Cu), %		0 to 0.1
Copper (Cu), %		0

Iridium (Ir), %		0
Iridium (Ir), %		14.5 to 15.5

Iron (Fe), %		0 to 0.5
Iron (Fe), %		0

Magnesium (Mg), %		0.35 to 0.8
Magnesium (Mg), %		0

Manganese (Mn), %		0 to 0.030
Manganese (Mn), %		0

Platinum (Pt), %		0
Platinum (Pt), %		84.3 to 85.5

Silicon (Si), %		0.3 to 0.7
Silicon (Si), %		0

Zinc (Zn), %		0 to 0.1
Zinc (Zn), %		0

Residuals, %		0
Residuals, %		0 to 0.2