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Alloying Behavior and Properties of FeSiBAlNiCox High Entropy Alloys Fabricated by Mechanical Alloying and Spark Plasma Sintering

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Abstract

In this paper, FeSiBAlNiCox (x = 0.2, 0.8) high-entropy alloy (HEA) powders were fabricated by mechanical alloying process, and the powders milled for 140 h were sintered by spark plasma sintering (SPS) technique. The microstructures and properties of as-milled powders and as-sintered samples were investigated. The results reveal that the final milling products (140 h) of both sample powders present the fully amorphous structure. The increased Co contents obviously enhance the glass forming ability and thermal stability of amorphous HEA powders, which are reflected by the shorter formation time of fully amorphous phase and the higher onset crystallization temperature, respectively. According to coercivity, the as-milled FeSiBAlNiCox (x = 0.2, 0.8) powders (140 h) are the semi-hard magnetic materials. FeSiBAlNiCo0.8 HEA powders possess the highest saturation magnetization and largest remanence ratio. The SPS-ed products of both bulk HEAs are composed of body-centered cubic solid solution, and FeSi and FeB intermetallic phases. They possess the high relative density above 97% and excellent microhardness exceeding 1150 HV. The as-sintered bulks undergo the remarkable increase in saturation magnetization compared with the as-milled state. The SPS-ed FeSiBAlNiCo0.8 HEA exhibits the soft magnetic properties. The electrochemical corrosion test is carried out in 3.5% NaCl solution. The SPS-ed FeSiBAlNiCo0.2 HEA reveals the better passivity with low passive current density, and the higher pitting resistance with wide passive region.

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Acknowledgements

The authors acknowledge financial support from the Natural Science Foundation of China (No. 51671095), and Key Research Development Program of Shandong Province of China (No. 2015GGx102016).

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Jinan, No. 336, West Road of Nan Xinzhuang, Jinan, 250022, People’s Republic of China

    Wen Wang, Boyu Li, Sicheng Zhai, Juan Xu, Zuozhe Niu, Jing Xu & Yan Wang

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  1. Wen Wang
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  2. Boyu Li
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Correspondence to Yan Wang.

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Wang, W., Li, B., Zhai, S. et al. Alloying Behavior and Properties of FeSiBAlNiCox High Entropy Alloys Fabricated by Mechanical Alloying and Spark Plasma Sintering. Met. Mater. Int. 24, 1112–1119 (2018). https://doi.org/10.1007/s12540-018-0047-1

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  • DOI: https://doi.org/10.1007/s12540-018-0047-1

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