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Elmet Technologies

Gamma Titanium Aluminide, TiAl
Categories: Metal; Intermetallic

Material Notes: Intermetallic aluminides have good mechanical properties and stability to be used in high temperature environments. A thin protective Al2O3 coating forms to provide oxidative stability. A range of stoichiometries is possible through elemental substitutions. Researchers are examining titanium aluminide applications in fields such as jet engine turbines because of their high temperature properties and low density.

May be processed by ingot metallurgy or forging. Limited processability by casting. Difficult to sheet roll.


Composition table gives weight percent.

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Physical PropertiesMetricEnglishComments
Density 3.91 g/cc0.141 lb/in³
 
Mechanical PropertiesMetricEnglishComments
Tensile Strength, Ultimate 450 - 800 MPa65300 - 116000 psi
Tensile Strength, Yield 400 - 650 MPa58000 - 94300 psi
Elongation at Break 0.00 - 4.0 %0.00 - 4.0 %
Modulus of Elasticity 176 GPa25500 ksi
 
Thermal PropertiesMetricEnglishComments
Melting Point 1460 °C2660 °F
Maximum Service Temperature, Air 900 °C1650 °FOxidation Limit
Maximum Service Temperature, Inert 1000 °C1830 °FCreep Limit
 
Component Elements PropertiesMetricEnglishComments
Aluminum, Al 36 %36 %
Titanium, Ti 64 %64 %
 
Descriptive Properties
Critical Ordering Temperature1460°C
Crystal StructureL10Ordered Tetragonal

References for this datasheet.

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