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IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2024-12-23 DOI:10.1007/s12598-024-03148-z

Xiu-Xiu Lv, Wen-Tao Liu, Jia-Qi Li, Lian-Zhou Li, Cai-Xia Wang, Hua Zhang, Xin Zhou, Liang Jiang, Jing-Jing Ruan, Li-Long Zhu

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引用次数: 0

摘要

L12 纳米颗粒与包括 L21、B2、σ 和 η 在内的硬金属间相的共沉淀强化，为开发具有良好强度-电导平衡的先进钴铬镍高熵合金 (HEA) 展示了巨大的潜力。了解铝和钛对 CoCrFeNi 高熵合金中这些金属间相的形成和稳定性的合金化效应，对于有效探索未来合金设计的多组分空间至关重要。在本研究中，我们使用高通量增材制造（AM）技术制造了由 35 种不同成分组成的逐步成分分级的 CoCrFeNiAlTi HEA，并通过一系列局部表征技术对其进行了分析。我们的分析证实了面心立方（FCC）和体心立方（BCC）这两种主要固溶相以及四种不同的金属间相，包括 L12、L21、σ 和 η。通过重叠这些相的零相分数 (ZPF) 线，确定了多组分 CoCrFeNi-AlTi 体系在 800 °C 时的伪三元相图，与文献结果非常吻合。此外，还确定了随成分变化的微观结构演变和维氏硬度（HV），为设计具有优异微观结构稳定性和平衡强度-电导性能的 CoCrFeNi-AlTi HEAs 提供了大量机会，使其可用于高温下的结构应用。

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High-throughput additive manufacturing and characterization of CoCrFeNi–AlTi high-entropy alloys

Co-precipitation strengthening of the L1₂ nano-particles along with hard intermetallic phases, including L2₁, B2, σ and η, demonstrates significant potential for the development of advanced CoCrFeNi high-entropy alloys (HEAs) with favorable strength-ductility balances. Understanding the alloying effect of Al and Ti on the formation and stability of these intermetallic phases in the CoCrFeNi HEAs is crucial for efficiently exploring the multi-component space for future alloy designs. In the present work, stepwise compositionally graded CoCrFeNi–AlTi HEAs comprising 35 different compositions were fabricated using high-throughput additive manufacturing (AM) and analyzed through a suite of localized characterization techniques. Our analysis confirmed the existence of two primary solid solution phases, face-centered cubic (FCC) and body-centered cubic (BCC), as well as four distinct intermetallic phases, which include L1₂, L2₁, σ and η. By overlapping the zero phase fraction (ZPF) lines of these phases, the pseudo-ternary phase diagram of the multi-component CoCrFeNi–AlTi system at 800 °C was determined, demonstrating good agreement with the literature results. Furthermore, the composition-dependent microstructural evolution and Vickers hardness (HV) were also established, providing numerous opportunities to design CoCrFeNi–AlTi HEAs with superior microstructure stability and balanced strength-ductility properties for structural applications at elevated temperatures.

Graphical abstract

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.