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Publisher DOI: 10.3390/met5042252
Title: In situ high-energy X-ray diffraction during hot-forming of a multiphase TiAl alloy
Language: English
Authors: Stark, Andreas 
Rackel, Marcus Willi 
Tchouaha Tankoua, Aristide 
Oehring, Michael 
Schell, Norbert 
Lottermoser, Lars 
Schreyer, Andreas 
Pyczak, Florian 
Keywords: crystallographic texture;X-ray diffraction;synchrotron radiation;intermetallic alloy;titanium aluminides based on γ-TiAl;hot-forming;thermo-mechanical processing;phase constitution
Issue Date: 30-Nov-2015
Publisher: Multidisciplinary Digital Publishing Institute
Source: Metals 5 (4): 2252-2265 (2015)
Journal or Series Name: Metals 
Abstract (english): Intermetallic γ-TiAl based alloys exhibit excellent high-temperature strength combined with low density. This makes them ideal candidates for replacing the twice as dense Ni base super-alloys, currently used in the medium temperature range (~700 °C) of industrial and aviation gas turbines. An important step towards the serial production of TiAl parts is the development of suitable hot-forming processes. Thermo-mechanical treatments often result in mechanical anisotropy due to the formation of crystallographic textures. However, with conventional texture analysis techniques, their formation can only be studied after processing. In this study, in situ high-energy X-ray diffraction measurements with synchrotron radiation were performed during hot-forming. Thus, it was possible to record the evolution of the phase constitution as well as the formation of crystallographic texture of different phases directly during processing. Several process temperatures (1100 °C to 1300 °C) and deformation rates were investigated. Based on these experiments, a process window can be recommended which results in the formation of an optimal reduced texture.
DOI: 10.15480/882.2158
ISSN: 2075-4701
Other Identifiers: doi: 10.3390/met5042252
Institute: Werkstoffphysik und -technologie M-22 
Type: (wissenschaftlicher) Artikel
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