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Formation and thermal stability of ω-Ti(Fe) in α-phase-based Ti(Fe) alloys

Kriegel, M. J.; Rudolph, M.; Kilmametov, A.; Straumal, B. B.; Ivanisenko, J.; Fabrichnaya, O.; Hahn, H.; Rafaja, D.

Abstract (englisch):
In this work, the formation and thermal stability of the ω-Ti(Fe) phase that were produced by the high-pressure torsion (HPT) were studied in two-phase α-Ti + TiFe alloys containing 2 wt.%, 4 wt.% and 10 wt.% iron. The two-phase microstructure was achieved by annealing the alloys at 470 °C for 4000 h and then quenching them in water. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were utilized to characterize the samples. The thermal stability of the ω-Ti(Fe) phase was investigated using differential scanning calorimetry (DSC) and in situ high-temperature XRD. In the HPT process, the high-pressure ω-Ti(Fe) phase mainly formed from α-Ti. It started to decompose by a cascade of exothermic reactions already at temperatures of 130 °C. The decomposition was finished above ~320 °C. Upon further heating, the phase transformation proceeded via the formation of a supersaturated α-Ti(Fe) phase. Finally, the equilibrium phase assemblage was established at high temperatures. The eutectoid temperature and the phase transition temperatures measured in deformed and heat-treated samples are compared for the samples with different iron concentrations and for samples with different phase compositions prior to the HPT process. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000118844
Veröffentlicht am 04.05.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2075-4701
KITopen-ID: 1000118844
HGF-Programm 43.22.01 (POF III, LK 01)
Functionality by Design
Erschienen in Metals
Band 10
Heft 3
Seiten Article No. 402
Vorab online veröffentlicht am 21.03.2020
Schlagwörter Ti–Fe; high-pressure torsion; microstructure; high-temperature XRD; differential scanning calorimetry; phase diagram; CalPhaD
Nachgewiesen in Web of Science
Scopus
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