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Experimental studies and thermodynamic simulation of phase transformations in high Nb containing y-TiAl based alloys

Identifieur interne : 009591 ( Main/Exploration ); précédent : 009590; suivant : 009592

Experimental studies and thermodynamic simulation of phase transformations in high Nb containing y-TiAl based alloys

Auteurs : Harald F. Chladil [Autriche] ; Helmut Clemens [Autriche] ; Gerald A. Zickler [Autriche] ; Masao Takeyama [Japon] ; Ernst Kozeschnik [Autriche] ; Arno Bartels [Allemagne] ; Thomas Buslaps [France] ; Rainer Gerling [Allemagne] ; Sascha Kremmer [Autriche] ; Lareine Yeoh [Australie] ; Klaus-Dieter Liss [Australie]

Source :

RBID : Pascal:08-0341356

Descripteurs français

English descriptors

Abstract

Solid-state phase transformations and phase transition temperatures in Ti-45 at.% Al and Ti-45 at.% Al-(5, 7.5, 10) at.% Nb alloys were analyzed experimentally and compared to thermodynamic calculations. Results from scanning electron microscopy, high-energy and conventional X-ray diffraction as well as differential scanning calorimetry were used for the characterization of the prevailing phases and phase transformations. For the prediction of phase stabilities and phase transition temperatures, thermodynamic calculations using the CALPHAD method were conducted. In order to achieve better agreement between calculated and experimental results, a commercially available database was modified using our own results from thermo-physical measurements and annealing treatments.


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Le document en format XML

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<div type="abstract" xml:lang="en">Solid-state phase transformations and phase transition temperatures in Ti-45 at.% Al and Ti-45 at.% Al-(5, 7.5, 10) at.% Nb alloys were analyzed experimentally and compared to thermodynamic calculations. Results from scanning electron microscopy, high-energy and conventional X-ray diffraction as well as differential scanning calorimetry were used for the characterization of the prevailing phases and phase transformations. For the prediction of phase stabilities and phase transition temperatures, thermodynamic calculations using the CALPHAD method were conducted. In order to achieve better agreement between calculated and experimental results, a commercially available database was modified using our own results from thermo-physical measurements and annealing treatments.</div>
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