|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||O-phase in a Lamellar TiAlNb Alloy Produced by Powder Metallurgy
||Heike Gabrisch, Uwe Lorenz, Florian Pyczak, Marcus Rackel, Andreas Stark
|On-Site Speaker (Planned)
High specific strength, high temperature stability and good corrosion resistance make TiAl-alloys attractive candidates for structural applications in aero-engines. Depending on Al-content and alloying elements the alloys are composed of the major phases β<sub>o</sub> (cubic), α<sub>2</sub> (hexagonal) and γ (tetragonal). In the ternary alloy Ti-42Al-8.5Nb (at.-%) improved high temperature strength and better room temperature ductility were attributed to the occurrence of an additional orthorhombic phase (O-phase) that form out of the parent α<sub>2</sub> phase during thermal treatment. The O-phase with the ideal composition Ti2AlNb has been reported previously in other ternary alloys Ti-(12-31)Al-(12.5-37)Nb, but not for alloys in the present composition range. In this study the O-phase is identified by single crystal electron diffraction. The morphology of phases within α<sub>2</sub> laths of lamellar (α<sub>2</sub>+γ) colonies is characterized by conventional imaging techniques, HAADF and high resolution imaging.
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