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MICROSTRUCTURAL STABILITY OF FULLY LAMELLAR TI-45AL-5NB-0.2B-0.75C ALLOY

1 ČEGAN Tomáš
Co-authors:
1 ŠPALEK František 1 ZIENTEK Stanislav 1 VONTOROVÁ Jiřina 1 STRUNG Václav
Institution:
1 VSB - Technical University of Ostrava, Ostrava, Czech Republic, Regional Materials Science and Technology Centre, Ostrava, Czech Republic, EU, tomas.cegan@vsb.cz
Conference:
26th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 24th - 26th 2017
Proceedings:
Proceedings 26th International Conference on Metallurgy and Materials
Pages:
1676-1681
ISBN:
978-80-87294-79-6
ISSN:
2694-9296
Published:
9th January 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
396 views / 191 downloads
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Abstract

The microstructural stability of fully lamellar γ-TiAl alloy was studied under thermal exposure at 750, 850 and 950 °C for 3400 h. The microstructure analysis shows that the most dominant change in the microstructure was that the α2 lamellae thinned gradually and thinning was more pronounced with increasing temperature and with increasing time. Formation of recrystallized γ grains and Ti2AlC carbides were also observed especially during the temperature 850 and 950 °C after prolonged heat treatment. The effect of microstructural changes during the thermal exposure on mechanical properties was evaluated and discussed.

Keywords: Titanium aluminides, thermal stability, microstructure, carbides

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