|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||Hot Forming of Titanium Aluminide Alloys Studied In Situ with Synchrotron Radiation
||Andreas Stark, Marcus Rackel, Michael Oehring, Norbert Schell, Lars Lottermoser, Florian Pyczak
|On-Site Speaker (Planned)
Several microstructure parameters, e.g. grain size, phase fractions or crystallographic texture, change during thermo-mechanical processing. But with conventional metallographic techniques the microstructure can only be analysed after processing. Thus the real high temperature conditions are often masked by lower temperature phase transformations or recrystallization. To overcome this problem we used a deformation dilatometer modified for working in the HZG synchrotron radiation beamline HEMS at DESY, Germany. Thereby, the evolution of the microstructure was directly observed by X-ray diffraction during hot forming while simultaneously recording the process parameters. We studied the hot compressive deformation of titanium aluminide alloys at different process temperatures between 1100°C and 1300°C. We observed the formation of crystallographic textures in γ-TiAl, α-Ti(Al) and β-Ti(Al) in situ and time resolved during hot forming. The influence of different phase fractions and process parameters on texture formation was analysed, which is necessary information for the determination of suitable process routes.
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