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000192635 1001_ $$aStark, Andreas$$b0$$eCorresponding Author
000192635 245__ $$aThe Transformation Mechanism of $\beta$-Phase to $\omega$-Related Phases in Nb-Rich $\gamma$-TiAl Alloys Studied by In Situ High-Energy X-Ray Diffraction
000192635 260__ $$aUetikon$$bTrans Tech Publ.$$c2013
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000192635 520__ $$aIn recent years intermetallic γ-TiAl based alloys with additional amounts of the ternary bcc β Ti(Al,Nb) phase attracted increasing attention due to their improved workability at elevated temperatures. Depending on alloy composition and heat treatment the ductile high-temperature β phase can transform to several ordered phases at lower temperatures. However, currently available phase diagrams of these multiphase alloys are quite uncertain and the precipitation kinetics of some metastable phases is far from understood. In the present study various transformation pathways of the third phase were observed in situ by means of high-energy X-ray diffraction using synchrotron radiation. A Ti-45Al-10Nb (at.%) specimen was subjected to a temperature ramp of repeated heating cycles (700 °C - 1100 °C) with subsequent quenching at different rates. Depending on the quenching rate reversible transformations of the B2-ordered βo phase to different ω-related phases were observed. The results indicate that the complete transformation from βo to hexagonal B82-ordered ωo consists of two steps which are both diffusion controlled but proceed with different velocities.
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000192635 7001_ $$aOehring, Michael$$b1
000192635 7001_ $$aPyczak, Florian$$b2
000192635 7001_ $$aLippmann, Thomas$$b3
000192635 7001_ $$aLottermoser, Lars$$b4
000192635 7001_ $$aSchreyer, Andreas$$b5
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