Publications

Effect of Oxygen on High-temperature Phase Equilibria in Ternary Ti-Al-Nb Alloys

Distl, B. and Dehm, G. and Stein, F.

ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
Volume: 646 Pages: 1151-1156
DOI: 10.1002/zaac.202000098
Published: 2020

Abstract
Alloys based on titanium aluminides received a lot of attention because of their capability to substitute Ni-based superalloys in high-temperature applications. However, the phase equilibria between the main microstructure constituents (αTi), (βTi), γ (TiAl) and α2(Ti3Al) can be shifted significantly by impurities such as oxygen especially at high temperatures. This behavior is investigated on the tie-triangle (αTi) + (βTi) + γ (TiAl) in the ternary Ti-Al-Nb system at 1300 °C. An explanation for this behavior could be the occupation of octahedral voids by impurities in certain phases. © 2020 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.

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