EVOLUTION OF MICROSTRUCTURE IN TI15MO ALLOY DEFORMED BY HIGH PRESSURE TORSION DURING LINEAR HEATING

1 BARTHA Kristína
Co-authors:
1 STRÁSKÝ Josef 1 VESELÝ Jozef 2 POLYAKOVA Veronika 2 SEMENOVA Irina 1 JANEČEK Miloš
Institutions:
1 Department of Physics of Materials, Charles University, Prague, Czech Republic, EU, kristina.bartha@met.mff.cuni.cz
2 Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, Ufa, Russian Federation
Conference:
28th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 22nd - 24th 2019
Proceedings:
Proceedings 28th International Conference on Metallurgy and Materials
Pages:
1339-1344
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
25 views / 8 downloads
Abstract

The influence of severe plastic deformation on ongoing phase transformations in metastable β-Ti alloy Ti15Mo was investigated in-situ during linear heating by electrical resistance and complemented by ex-situ microstructure observations using transmission electron microscopy. Several non-monotonic regions in the temperature dependence of electrical resistance were identified and associated with corresponding phase transitions, namely the reversible diffusionless shuffle transformation of athermal ω phase, followed first by diffusion controlled growth of isothermal ω phase and subsequently its continuous dissolution. Formation of α phase at high temperature is associated with increase of the electrical resistance. The influence of severe plastic deformation on the phase transformations sequence is discussed in detail. For ex-situ microstructural observations different conditions were selected based on electrical resistance measurement. It was revealed, that lattice defects introduced by severe plastic deformation strongly influence the phase transitions during heating of the alloy.

Keywords: Metastable β Ti alloy, high pressure torsion, phase transformations, microstructure, electrical resistance
Scroll to Top