Experimental Investigation of Solidification and Isothermal Section at 1000 °C in the Fe-Al-Ti-C System

IF 2 4区材料科学 Q4 CHEMISTRY, PHYSICAL

Journal of Phase Equilibria and Diffusion Pub Date : 2026-05-31 DOI:10.1007/s11669-026-01255-1

I. Fartushna, A. Samelyuk, V. Kravchuk, D. Kapush, M. Bulanova

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Abstract

Phase equilibria in the Fe-rich corner of the quaternary Fe-Al-Ti-C system upon solidification and at 1000 °C were studied using differential thermal analysis (DTA), powder x-ray diffraction (XRD), microscopic examination and electron probe microanalysis (EPMA). The partial liquidus and solidus projections and the isothermal section at 1000 °C were constructed. The results are presented on the Fe-25Al-Ti-C composition triangle, where the corner Fe-25Al corresponds to the disordered (αFe) solid solution or its ordered derivatives FeAl or Fe₃Al, depending on the temperature. The boundaries of the primary crystallization regions of the phases, types and coordinates of mono- and bivariant equilibria are determined. The liquidus surface in the studied region is characterized by the regions of primary crystallization of the (αFe), Fe₂Ti, Fe₃AlC (κ-carbide), TiC and graphite (C) phases. The solidus surface and isothermal section at 1000 °C are defined by the co-existence of the TiC phase with all phases of the system forming two three-phase regions, which form by transition (U) type four-phase reactions.

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Fe-Al-Ti-C体系1000℃凝固及等温断面实验研究

采用差热分析（DTA）、粉末x射线衍射（XRD）、显微检查和电子探针显微分析（EPMA）研究了四元态Fe-Al-Ti-C体系富铁角在凝固时和1000℃时的相平衡。建立了部分液相和固相投影和1000℃等温剖面。结果显示在Fe-25Al- ti - c组成三角形上，其中角Fe-25Al对应于无序（αFe）固溶体或其有序衍生物FeAl或Fe3Al，随温度的变化而变化。确定了相的初晶区边界、单相平衡和二元平衡的类型和坐标。研究区液相表面主要为（αFe）、Fe2Ti、Fe3AlC （κ-碳化物）、TiC和石墨(C)相的初晶区。1000℃时固相表面和等温截面由TiC相与体系的所有相共存确定，形成两个三相区，由过渡(U)型四相反应形成。

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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.