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Influence of β-Stabilizers on the α-Ti→ω-Ti Transformation in Ti-Based Alloys

Kilmametov, Askar; Gornakova, Alena; Karpov, Mikhail; Afonikova, Natalia; Korneva, Anna; Zięba, Pawel; Baretzky, Brigitte; Straumal, Boris

Abstract:
The development of next generation Ti-based alloys demand completely new processes and approaches. In particular, the Ti-alloys of next generation will contain not only α-Ti and β-Ti phases, but also small amounts of ω-phase and intermetallic compounds. The β→ω phase transformation induced by high-pressure torsion (HPT) has been studied in detail recently. In this work, we investigated the HPT-induced α→ω phase transformation. For this purpose, we added various β-stabilizers into α-Ti matrix of studied Ti-alloys. Ti-alloys with 4% Fe, 2% Cr, 3% Ni, and 4% Co (wt. %) have been annealed at the temperatures below their point of eutectoid decomposition, from β-Ti to α-Ti, and respective intermetallics (TiFe, Ti$_{2}$Co, Ti$_{2}$Ni, TiCr$_{2}$). Volume fraction of HPT-driven ω-phase (from ≤5 up to ~80%) depended on the amount of alloying element dissolved in the α-matrix. Evaluation of lattice parameters revealed accelerated mass transfer during HPT at room temperature corresponding to bulk diffusion in α-Ti at ~600 °С.

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Verlagsausgabe §
DOI: 10.5445/IR/1000127002
Veröffentlicht am 30.11.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2227-9717
KITopen-ID: 1000127002
HGF-Programm 43.22.01 (POF III, LK 01) Functionality by Design
Erschienen in Processes
Band 8
Heft 9
Seiten Art. Nr.: 1135
Vorab online veröffentlicht am 11.09.2020
Schlagwörter Ti-alloys, α-Ti→ω-Ti transformation, β-stabilizers, high-pressure torsion, mass transfer
Nachgewiesen in Scopus
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