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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)

Abstract:
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
Originalveröffentlichung
DOI: 10.3390/ma14092262
Scopus
Zitationen: 3
Web of Science
Zitationen: 3
Dimensions
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
Scopus
Web of Science
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