CHARACTERIZATION OF THE EFFECT OF THE ALPHA-PHASE PRECIPITATION IN HPTDEFORMED TI15MO ALLOY

1 BARTHA Kristína
Co-authors:
1 STRÁSKÝ Josef 1 TERYNKOVÁ Anna 2 SEMENOVA Irina 2 POLYAKOVA Veronika 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:
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:
1304-1309
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:
17 views / 1 download
Abstract

Ti15Mo metastable β-Ti alloy was subjected to severe plastic deformation by high pressure torsion. The microstructure and chemical composition of the studied Ti15Mo alloy was investigated by scanning electron microscope. Furthermore, the microhardness of the non-deformed and deformed material was measured which was influenced by the local features of their microstructure.The solution treated Ti15Mo alloy after ageing contains acicular α-phase particles along grain boundaries and in the interior of the β-grains. The aged and deformed alloy exhibits an ultra-fine grained duplex (α+β) microstructure. The equiaxed and submicrometer size α-phase particles form by diffusion via expelling a β stabilizer element (in our case Mo). Therefore, the slight difference in the chemical composition can significantly affect the morphology of the α-phase precipitation. The microhardness measurement revealed a remarkable increase of the microhardness of the HPT-deformed Ti15Mo alloy in α+β condition.

Keywords: Metastable beta titanium alloys, high pressure torsion, phase transformations, alpha phase precipitation
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