Abstract
The addition of carbon can improve high temperature creep resistance of TiAl intermetallics. In this work, the precipitation behavior of Ti-45Al-3Fe-2Mo-0.5C during the creep process at 750 °C and 200 MPa has been investigated. The results show that the strain of C-doped TiAl is about 60% lower than that of the C-free TiAl at a creep time of 8 × 105 s. The precipitations, including β phase, Ti3AlC phase and Ti2AlC phases, occurred in the lamellar structure of Ti-45Al-3Fe-2Mo-0.5C after creep tests. The formation of both Ti3AlC and Ti2AlC carbides is promoted at dislocations during creep tests.
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