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Divergent interfacial behaviors of homo-/hetero-phase boundaries in a dual-phase eutectic high-entropy alloy

双相共晶高熵合金中迥异的同/异相界面行为

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Abstract

The interfacial structures and behaviors are critical in determining the material properties. Our study aims to investigate such unique interfacial structures and behaviors in multiphase systems involving complex compositions. Herein, we report the divergent interfacial behaviors of the L12–L12, B2–B2, and L12–B2 boundaries prepared via the bonding of AlCoCrFeNi2.1 eutectic high-entropy alloys (HEAs). Specifically, interfacial dynamic recrystallization (DRX) occurs in the L12–L12 boundary owing to the thermostrain-induced grain boundary evolution. In contrast, the bonding of the B2–B2 boundary may be realized by interface diffusion, and no evident DRX occurs owing to the small interfacial shear strain. The DRX grains only developed on the L12 side in the L12–B2 boundary because of the difference in the intrinsic structural traits between L12 and B2. The diffusion of elements contributed to the bonding of this dissimilar boundary. Moreover, a strain-induced B2II precipitation phenomenon surrounding the bonding interface was revealed because of the high defect-precipitation sensitivity of HEAs. The B2II particle precipitation depleted the Al and Ni within the matrix, leading to L12 disordering. The Zener pinning effect exerted by B2II precipitates was quantitatively evaluated by calculating the corresponding limited grain radius RL = 1.8 µm. This pinning effect of B2II precipitates and the sluggish diffusion effect may induce temperature-dependent DRX behaviors of the L12–L12 boundary. This study reveals the understanding of the unique interfacial behaviors of multiphase HEAs and provides new insights into the effects of multiple phases, complex composition, and interfacial precipitation on interfacial evolution.

摘要

界面的结构和行为对材料的性能具有重要的影响. 本文旨在研究复杂成分多相体系材料中这些独特的界面结构和行为. 我们报道了通过连接AlCoCrFeNi2.1共晶高熵合金所获得的L12–L12, B2–B2, L12–B2三种界面迥异的界面行为. 具体是, 由于热-应变诱导的晶界演化, 在L12–L12界面附近出现了明显的界面动态再结晶. 相反, 由于极少的界面应变, B2–B2界面几乎没有发生动态再结晶, 其连接可能是由于扩散引起的. 由于L12相和B2 相本征的结构差异, 在L12–B2界面处只在L12 相侧发生了动态再结晶. 这类异质界面的连接是由于界面元素的扩散. 另外, 由于高熵合金高的缺陷-析出敏感性, 在连接界面附近出现了应变诱导析出的B2II相. B2II相的析出消耗了基体中的Ni, Al元素, 造成了L12相的无序化. 通过定量计算相应晶粒的极限尺寸评估了这些B2II相带来的Zener钉扎效应. 这种B2II相的钉扎作用及元素的缓慢扩散效应可能导致了L12–L12界面温度依赖的动态再结晶行为. 本研究有助于理解多相高熵合金独特的界面行为, 并为多相、复杂成分、界面析出等因素对界面演化的影响提供了新的认识.

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Acknowledgements

This work was supported by the National Key Research and Development Program (2018YFA0702900), the National Natural Science Foundation of China (52173305, 52101061, 52233017, and 52203384), the Strategic Priority Research Program of the Chinese Academy of Sciences (XDC04000000), China Postdoctoral Science Foundation (2020M681004, 2021M703276, and 2022T150662), the IMR Innovation Foundation (2022-PY12), LingChuang Research Project of China National Nuclear Corporation, and the Youth Innovation Promotion Association, Chinese Academy of Sciences.

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  1. These authors contributed equally to this work.

Authors and Affiliations

  1. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Qianning Dai  (代乾宁), Bijun Xie  (谢碧君), Shaofei Ren  (任少飞), Zhenxiang Yu  (余朕翔), Bin Xu  (徐斌) & Mingyue Sun  (孙明月)

  2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Qianning Dai  (代乾宁), Bijun Xie  (谢碧君), Shaofei Ren  (任少飞), Zhenxiang Yu  (余朕翔), Bin Xu  (徐斌) & Mingyue Sun  (孙明月)

  3. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China

    Qianning Dai  (代乾宁), Shaofei Ren  (任少飞) & Zhenxiang Yu  (余朕翔)

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  1. Qianning Dai  (代乾宁)
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Contributions

Dai Q and Xie B designed the study; Dai Q performed the main experiments with support from Xie B, Ren S, and Yu Z; Dai Q analyzed the data and wrote the draft with the help of Xie B, Xu B, and Sun M. All authors contributed to the discussion of the results and commented on the manuscript.

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Correspondence to Mingyue Sun  (孙明月).

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Conflict of interest

The authors declare that they have no conflict of interest.

Qianning Dai received a Bachelor degree from Dalian University of Technology in 2020. He is now pursing his PhD degree under the supervision of Prof. Mingyue Sun at the School of Materials Science and Engineering, University of Science and Technology of China. His main research interest is the metal additive forging of high-entropy alloys.

Bijun Xie received her PhD degree from the Institution of Metal Research (IMR), Chinese Academy of Sciences in 2020. She is now conducting her postdoctoral research at IMR. Her main research interests include studies on the evolution mechanism of interfacial microstructure and interfacial oxides in additive forging of stainless steel and Ti alloys as well as high-entropy alloys.

Bin Xu received his PhD degree from IMR, Chinese Academy of Sciences. He is a full associate professor at IMR. His main research interest is numerical simulation and process design of the forging process.

Mingyue Sun received his PhD degree from IMR, Chinese Academy of Sciences in 2009 and has been working at IMR until now. Currently, he is a full professor and doctoral supervisor at IMR. His most recent research interests include the technology of metal additive forging and special steel forging and casting integration technology as well as the advanced technology of shape and performance control of heavy forgings.

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Dai, Q., Xie, B., Ren, S. et al. Divergent interfacial behaviors of homo-/hetero-phase boundaries in a dual-phase eutectic high-entropy alloy. Sci. China Mater. 66, 2454–2466 (2023). https://doi.org/10.1007/s40843-022-2361-4

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