PHASE TRANSFORMATIONS IN BETA-TI ALLOYS STUDIED BY IN-SITU ELECTRICAL RESISTANCE MEASUREMENT

1 HARCUBA Petr
Co-authors:
1 ZHÁŇAL Pavel 1 ŠMILUEROVÁ Jana
Institution:
1 Department of Physics of Materials, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic, EU, Harcuba.p@gmail.com
Conference:
27th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 23rd - 25th 2018
Proceedings:
Proceedings 27th International Conference on Metallurgy and Materials
Pages:
1315-1320
ISBN:
978-80-87294-84-0
ISSN:
2694-9296
Published:
24th October 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
22 views / 3 downloads
Abstract

Phase transformations in several metastable β-titanium alloys were studied during linear heating by in-situ electrical resistance measurement. The initial decrease of electrical resistance is caused by a reverse shuffle transformation of athermal ω phase particles to β matrix. The following temperature interval in which a negative dependence of electrical resistance was observed correlates with diffusional stabilization and growth of isothermal ω phase which releases internal stresses in the β matrix. At the temperature of ω phase stability limit (500 – 570 °C, depending on the type of alloy), an abrupt change in electrical resistance is observed. The subsequent β → α followed by α → β transformation may cause an additional local maximum in the electrical resistance, depending on the type of the studied alloy and the kinetics of this transition. Electrical resistance measurement proved to be a very sensitive technique for phase transformation analysis.

Keywords: Metastable beta-Ti alloys, omega phase, electrical resistivity
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