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Omega phase formation in ti–3wt

Korneva, A.; Straumal, B. 1; Kilmametov, A.; Gornakova, A.; Wierzbicka-Miernik, A.; Lityńska-Dobrzyńska, L.; Chulist, R.; Gondek, Ł.; Cios, G.; Zięba, P.
1 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)

It is well known that severe plastic deformation not only leads to strong grain refinement and material strengthening but also can drive phase transformations. A study of the fundamentals of α → ω phase transformations induced by high-pressure torsion (HPT) in Ti–Nb-based alloys is presented in the current work. Before HPT, a Ti–3wt.%Nb alloy was annealed at two different temperatures in order to obtain the α-phase state with different amounts of niobium. X-ray diffraction analysis, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were applied for the characterisation of phase transitions and evolution of the microstructure. A small amount of the β-phase was found in the initial states, which completely transformed into the ω-phase during the HPT process. During HPT, strong grain refinement in the α-phase took place, as did partial transformation of the α- into the ω-phase. Therefore, two kinds of ω-phase, each with different chemical composition, were obtained after HPT. The first one was formed from the β-phase, enriched in Nb, and the second one from the α-phase. It was also found that the transformation of the α-phase into the ω-phase depended on the Nb concentration in the α-Ti phase. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000133592
Veröffentlicht am 03.06.2021
DOI: 10.3390/ma14092262
Zitationen: 3
Web of Science
Zitationen: 3
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1996-1944
KITopen-ID: 1000133592
HGF-Programm 43.31.01 (POF IV, LK 01) Multifunctionality Molecular Design & Material Architecture
Erschienen in Materials
Verlag MDPI
Band 14
Heft 9
Seiten 2262
Schlagwörter high-pressure torsion; in situ high-temperature X-ray diffraction; Ti alloys; phase transformations; scanning electron microscopy; transmission electron microscopy; differential scanning calorimetry
Nachgewiesen in Dimensions
Web of Science
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