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Microstructure and magnetic properties evolution of Al/CoCrFeNi nanocrystalline high-entropy alloy composite

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Abstract

A systematic microstructure-oriented magnetic property investigation for Al/CoCrFeNi nanocrystalline high-entropy alloys composite (nc-HEAC) is presented. In the initial state, the Al/CoCrFeNi nc-HEAC is composed of face-centered cubic (FCC)-Al, FCC-CoCrFeNi and hexagonal close-packed (HCP)-CoNi phases. High energy synchrotron radiation X-ray diffraction and high-resolution transmission electron microscopy were used to reveal the relationship between microstructure evolution and magnetic mechanism of Al/CoCrFeNi nc-HEAC during heat treatment. At low-temperature annealing stage, the magnetic properties are mainly contributed by the HCP-CoNi phase. With the increase of temperature, the diffusion-induced phase transition process including the transformation of AlCoCrFeNi HEA from FCC to BCC structure and the growth of B2 phase plays a dominant role in the magnetic properties. It was found that the magnetic properties can be effectively regulated through the control of the thermal diffusion process. The nano dual-phase thermal diffusion-induced phase transition behavior of nanocomposites prepared based on laser-IGC technology provides guidance for the diffusion process and microstructure evolution of two phases in composites.

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摘要

本文系统研究了Al/CoCrFeNi纳米晶高熵合金复合材料 (nc-HEAC) 微观结构演变对磁性能的影响机制。在初始状态下, Al/CoCrFeNi nc-HEAC由面心立方结构的FCC-Al、FCC-CoCrFeNi和六方密排结构的HCP-CoNi相组成。利用高能同步辐射X射线衍射 (XRD) 和高分辨透射电子显微镜 (HRTEM) 研究了Al/CoCrFeNi nc-HEAC在热处理过程中的微观结构演变与磁性机理的关系。在低温退火阶段, 磁性主要由HCP-CoNi相贡献。随着温度的升高, 扩散诱导相变过程 (包括AlCoCrFeNi HEA从FCC转变为BCC结构和B2相的增多) 对磁性起主导作用。研究发现, 通过控制热扩散过程可以有效地调节磁性能。基于laser-IGC技术制备的纳米复合材料的纳米双相热扩散诱导相变行为为复合材料中两相的扩散过程和微观结构演化提供了指导。

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Acknowledgments

This study was financially supported by  National Key R&D Program of China (No. 2021YFB3802800), the Equipment Advance Research field Fund (No. 80922010401), equipment project of China (JZX7Y20210162400201), Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology, the Fundamental Research Funds for the Central Universities (Nos. 30919011404 and 30919011107), the National Natural Science Foundation of China (Nos. 51871120 and 51571119) and the Natural Science Foundation of Jiangsu Province (No. BK20200019). Tao Feng acknowledges the support from Qing Lan project and the distinguished professor project of Jiangsu province. We acknowledge the support of the Karlsruhe Nano Micro Facility for the microstructure characterization.

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Authors and Affiliations

  1. School of Material Science and Engineering, Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing, 210094, China

    Jun-Jie Wang, Zong-De Kou, Shu Fu, Shang-Shu Wu, Si-Nan Liu, Meng-Yang Yan, Si Lan, Horst Hahn & Tao Feng

  2. Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, 76021, Germany

    Di Wang & Horst Hahn

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  1. Jun-Jie Wang
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Wang, JJ., Kou, ZD., Fu, S. et al. Microstructure and magnetic properties evolution of Al/CoCrFeNi nanocrystalline high-entropy alloy composite. Rare Met. 41, 2038–2046 (2022). https://doi.org/10.1007/s12598-021-01931-w

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