Herstellung und Eigenschaften Al-reicher TiAl Legierungen  Autor
:Daniel Sturm Herkunft :OvGU Magdeburg, Fakultät für
Maschinenbau Datum :27.08.2010 Dokumente : Dataobject from
HALCoRe_document_00008890 Typ :Dissertation Format :Text
Kurzfassung :Compared to Ti-rich gamma-TiAl-based alloys Al-rich
TiAl alloys offer an additional reduction of 20% in density and
a better oxidation resistance which are both due to the
increased Al content. Polycrystalline material of two binary
alloys, namely Al60Ti40 and Al62Ti38 and a ternary Al62Ti36Nb2
alloy was manufactured by centrifugal casting. Selected single-
crystal samples were also produced by directional
solidification. The alloys were investigated in the cast
condition (containing various amounts of the metastable phases
Al5Ti3 and h-Al2Ti) and after annealing at 950 °C for 200 h
which produced (thermodynamically stable) lamellar gamma-TiAl +
r-Al2Ti microstructures. Microstructure characterization was
carried out employing light-optical, scanning and transmission