Ti-Fe Phase Evolution and Equilibria Toward β-Ti Superalloys

IF 1.5 4区材料科学 Q4 CHEMISTRY, PHYSICAL

Journal of Phase Equilibria and Diffusion Pub Date : 2023-12-10 DOI:10.1007/s11669-023-01066-8

P. O’Kelly, A. Watson, G. Schmidt, M. Galetz, A. J. Knowles

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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.

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钛-铁相演化与平衡，迈向β-钛超级合金

最近设计和开发的沉淀强化耐火金属合金表明，A2 + B2 bcc 超合金有可能成为一类新的高温材料。现有的 β-Ti 合金通常不会像其他高温合金那样使用金属间化合物进行强化；因此，充分添加铁（一种低成本的 β-Ti 稳定剂）可促进有序共晶金属间化合物相 β′-TiFe (B2) 的形成，为开发 β + β′ 双相领域提供了空间。然而，基态 Ti-Fe 双元存在关键的不确定性。目前的研究评估了通过不同的热处理策略，在无序-bcc β-钛基体中形成有序-bcc TiFe 沉淀的情况。微观结构优化揭示了在所谓的双相场中接近共晶温度下 Ti-Fe 相平衡的新见解，在这种情况下，β-Ti、β′-TiFe 和 α-Ti 之间存在着复杂的相互作用。

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来源期刊

Journal of Phase Equilibria and Diffusion 工程技术-材料科学：综合

CiteScore

2.50

自引率

7.10%

发文量

审稿时长

1 months

期刊介绍： The most trusted journal for phase equilibria and thermodynamic research, ASM International''s Journal of Phase Equilibria and Diffusion features critical phase diagram evaluations on scientifically and industrially important alloy systems, authored by international experts. The Journal of Phase Equilibria and Diffusion is critically reviewed and contains basic and applied research results, a survey of current literature and other pertinent articles. The journal covers the significance of diagrams as well as new research techniques, equipment, data evaluation, nomenclature, presentation and other aspects of phase diagram preparation and use. Content includes information on phenomena such as kinetic control of equilibrium, coherency effects, impurity effects, and thermodynamic and crystallographic characteristics. The journal updates systems previously published in the Bulletin of Alloy Phase Diagrams as new data are discovered.