Phase Equilibria and Microstructure Evolution in the Ni-rich Region of Binary Ni-Ce and Ternary Ni-Ce-X (X = Al, Nb, Cr, Ti) Systems at 900 °C

IF 1.7 4区材料科学 Q4 CHEMISTRY, PHYSICAL

Journal of Phase Equilibria and Diffusion Pub Date : 2025-06-05 DOI:10.1007/s11669-025-01196-1

Syeda Bushra Haider, Ishtiaque Karim Robin, Eric A. Lass

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Abstract

The equilibrium compositions of all phases in the Ni-rich region of binary Ni-Ce and ternary Ni-Ce-X (X = Al, Nb, Cr, Ti) systems at 900 °C were determined experimentally through isothermal annealing for up to 500 h and compared with currently available computational thermodynamic descriptions. Additionally, the study examined how adding a third element to the binary system affects the microstructure by analyzing changes in the volume fraction of the intermetallic phase in the eutectic region. It was observed that Nb and Ti addition lowered the intermetallic fraction in the eutectic region while Al and Cr addition did the opposite. The fraction of intermetallic phase in the eutectic region is very important because it contributes to extreme brittleness of these alloys. Also, Al, Nb and Ti addition promoted different precipitates upon annealing when added in sufficient amounts. The collected data on composition and phase equilibria provides crucial information for improving the thermodynamic assessments of the binary and ternary alloy systems.

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900℃时二元Ni-Ce和三元Ni-Ce-X （X = Al, Nb, Cr, Ti）体系富镍区相平衡和微观结构演变

在900°C下，通过等温退火500 h，实验确定了二元Ni-Ce和三元Ni-Ce-X （X = Al, Nb, Cr, Ti）体系富ni区所有相的平衡组成，并与现有的计算热力学描述进行了比较。此外，通过分析共晶区金属间相体积分数的变化，研究了在二元体系中加入第三元素对微观结构的影响。Nb和Ti的加入降低了共晶区的金属间组分，而Al和Cr的加入则相反。在共晶区金属间相的分数是非常重要的，因为它有助于这些合金的极端脆性。当Al、Nb和Ti的加入量足够时，退火后析出的析出也不同。所收集的成分和相平衡数据为改进二元和三元合金体系的热力学评估提供了重要信息。

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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.