Deformation behavior and plastic instability of boronized Al<sub>0.25</sub>CoCrFeNi high-entropy alloys

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

doi:10.1007/s12613-020-1967-6

Volume 27 Issue 10

Oct. 2020

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2020 > 27(10): 1363-1370

Jin-xiong Hou, Jing Fan, Hui-jun Yang, Zhong Wang, and Jun-wei Qiao, Deformation behavior and plastic instability of boronized Al_0.25CoCrFeNi high-entropy alloys, Int. J. Miner. Metall. Mater., 27(2020), No. 10, pp. 1363-1370. https://doi.org/10.1007/s12613-020-1967-6

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Jin-xiong Hou, Jing Fan, Hui-jun Yang, Zhong Wang, and Jun-wei Qiao, Deformation behavior and plastic instability of boronized Al0.25CoCrFeNi high-entropy alloys, Int. J. Miner. Metall. Mater., 27(2020), No. 10, pp. 1363-1370. https://doi.org/10.1007/s12613-020-1967-6

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Research Article

Deformation behavior and plastic instability of boronized Al_0.25CoCrFeNi high-entropy alloys

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Corresponding author:
Jun-wei Qiao E-mail: qiaojunwei@gmail.com
Received: 25 October 2019; Revised: 15 December 2019; Accepted: 16 December 2019; Available online: 8 January 2020

Abstract

Abstract

Using thermochemical treatments, boronized layers were successfully prepared on Al_0.25CoCrFeNi 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.
- boronizing;
- high-entropy alloys;
- boride layers;
- tensile strength;
- cleavage fracture

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