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- Title
Ti-Fe Phase Evolution and Equilibria Toward β-Ti Superalloys.
- Authors
O'Kelly, P.; Watson, A.; Schmidt, G.; Galetz, M.; Knowles, A. J.
- Abstract
Recent design and development of precipitate reinforced refractory metal alloys demonstrate the possibility of A2 + B2 bcc superalloys as a new class of high temperature materials. Existing β-Ti alloys do not typically employ reinforcement with intermetallics, as in other high temperature alloys; to this effect sufficient additions of Fe, a low cost β-Ti stabiliser, can promote formation of an ordered-bcc intermetallic phase, β′-TiFe (B2), offering scope to develop a β + β′ dual-phase field. However, key uncertainties exist in the base Ti-Fe binary. The current research evaluates the formation of ordered-bcc TiFe precipitates within a disordered-bcc β-Ti matrix through variable heat treatment strategies. The microstructure optimisation has revealed new insight into the Ti-Fe phase equilibria at near eutectoid temperatures in the purported dual-phase field, where a complex interplay between β-Ti, β′-TiFe and α-Ti exists.
- Subjects
PHASE equilibrium; HEAT resistant materials; HEAT resistant alloys; HEAT treatment; ALLOYS; DUAL-phase steel; TITANIUM composites; NICKEL alloys
- Publication
Journal of Phase Equilibria & Diffusion, 2023, Vol 44, Issue 6, p738
- ISSN
1547-7037
- Publication type
Article
- DOI
10.1007/s11669-023-01066-8