Experimental determination of (BCC + FCC) phase fields in the quaternary isotherm of Fe–Ni–Co–Cu at 950°C

IF 0.7 4区材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING

International Journal of Materials Research Pub Date : 2023-08-15 DOI:10.1557/s43578-023-01124-4

Biswarupa Samantaray, K. Kulkarni

引用次数: 0

Abstract

Quaternary isotherm of Fe–Ni–Co–Cu at 950 °C is determined by multiphase diffusion couple experiments, focused on establishing the (BCC + FCC) two-phase regions. The present findings, combined with our previous study, discover the presence of five separate two-phase fields in this isotherm namely (BCC + Cu-rich FCC), (BCC + Cu-lean FCC richer in Fe), (BCC + Cu-lean FCC richer in Co), (Cu-rich FCC + Fe-rich FCC), and (Cu-rich FCC + Co-rich FCC). This also indicates the existence of two three-phase fields. Based on diffusion couples exhibiting planar interfaces between BCC and FCC phases, three tie lines in (BCC + Cu-rich FCC) two-phase field were also determined. It is observed that Fe–Co–Cu ternary isotherm at 950 °C has a wider BCC region (up to 8 wt% Cu) than the commonly accepted phase diagram. A qualitative representation of the entire quaternary isotherm is proposed in the form of multiple iso-Ni concentration sections.

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950℃Fe-Ni-Co-Cu四元等温线(BCC + FCC)相场的实验测定

采用多相扩散偶联实验确定了Fe-Ni-Co-Cu在950℃时的第四等温线，重点建立了(BCC + FCC)两相区。结合我们之前的研究，我们发现在等温线中存在5个独立的两相场，即(BCC + Cu-rich FCC)、(BCC + Cu-lean FCC rich Fe)、(BCC + Cu-lean FCC rich Co)、(Cu-rich FCC + Fe-rich FCC)和(Cu-rich FCC + Co-rich FCC)。这也表明存在两个三相场。基于BCC和FCC两相之间存在平面界面的扩散偶，确定了(BCC +富cu FCC)两相场中的三条联结线。结果表明，在950℃时，Fe-Co-Cu三元等温线的BCC区域比一般的相图宽(高达8wt % Cu)。用多个等镍浓度剖面的形式提出了整个四元等温线的定性表示。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Materials Research 工程技术-冶金工程

CiteScore

1.30

自引率

12.50%

发文量

119

审稿时长

6.4 months

期刊介绍： The International Journal of Materials Research (IJMR) publishes original high quality experimental and theoretical papers and reviews on basic and applied research in the field of materials science and engineering, with focus on synthesis, processing, constitution, and properties of all classes of materials. Particular emphasis is placed on microstructural design, phase relations, computational thermodynamics, and kinetics at the nano to macro scale. Contributions may also focus on progress in advanced characterization techniques. All articles are subject to thorough, independent peer review.