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Deformation behavior and plastic instability of boronized Al0.25CoCrFeNi high-entropy alloys

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Abstract

Using thermochemical treatments, boronized layers were successfully prepared on Al0.25CoCrFeNi high-entropy alloys (HEAs). The thickness of the boronized layers ranged widely from 20 to 50 µm, depending on the heat treatment time. Boronizing remarkably improved the surface hardness from HV 188 to HV 1265 after treating at 900°C for 9 h. Moreover, boronizing enhanced the yield strength of HEAs from 195 to 265 MPa but deteriorated the tensile ductility. Multiple crackings in the boride layers significantly decreased the plasticity. The insufficient work-hardening capacity essentially facilitated the plastic instability of the boronized HEAs. With decreasing substrate thickness, the fracture modes gradually transformed from dimples to quasi-cleavage and eventually to cleavage.

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Acknowledgements

Jun-wei Qiao would like to acknowledge the financial support from National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering (No. 61420050204) and the Transformation of Scientific and Technological Achievements Programs of Higher Education Institutions in Shanxi, China (No. 2019BY044), and Jinxiong Hou would like to acknowledge the financial support from the Graduate Science and Technology Innovation Fund Project of Shanxi, China (No. 2019BY044).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China

    Jin-xiong Hou, Jing Fan, Hui-jun Yang, Zhong Wang & Jun-wei Qiao

  2. Key Laboratory of Interface Science and Engineering in Advanced Materials (Ministry of Education), Taiyuan University of Technology, Taiyuan, 030024, China

    Jun-wei Qiao

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  1. Jin-xiong Hou
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Hou, Jx., Fan, J., Yang, Hj. et al. Deformation behavior and plastic instability of boronized Al0.25CoCrFeNi high-entropy alloys. Int J Miner Metall Mater 27, 1363–1370 (2020). https://doi.org/10.1007/s12613-020-1967-6

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  • DOI: https://doi.org/10.1007/s12613-020-1967-6

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