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Effect of Nb content on thermal stability, mechanical and corrosion behaviors of hypoeutectic CoCrFeNiNbχ high-entropy alloys

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Abstract

A hypoeutectic CoCrFeNiNbχ system was synthesized to investigate the effect of Nb content on the thermal stability, mechanical properties, and corrosion behaviors. The hypoeutectic CoCrFeNiNbχ alloy, which contained the Laves phase, possessed two-phase eutectic structures. The elevated temperature may have an impact on the stability of the Laves phase. Nanoindentation measurements showed that the Laves phase is much harder than the FCC phase, which could be confirmed by the shallower maximum penetration depth in the typical P–h curve. Furthermore, the plasticity of the Laves phase was characterized by nanoindentation measurements. Compared with the FCC phase, the activation energy of dislocation nucleation in the Laves phase is much higher due to the large atomic size difference and the phase difference. Corrosion and passivation behaviors of CoCrFeNiNbχ were investigated in 3.5% NaCl solution. All the alloys exhibited spontaneous passivity and low current densities in 3.5% NaCl solution. Furthermore, the corrosion potential increased with the increasing Nb content, which indicated that the corrosion resistance enhanced with a higher Nb content.

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ACKNOWLEDGMENTS

G. Li acknowledges the Basic Research Project in the Hebei Province (Grant No. A2016203382) and the National Science Foundation of China (Grant No. 11674274).

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Authors and Affiliations

  1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China

    Mengdi Zhang, Lijun Zhang, Gong Li & Riping Liu

  2. Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee, 37996, USA

    Peter K. Liaw & Gong Li

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Correspondence to Gong Li.

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This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/editor-manuscripts/.

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Zhang, M., Zhang, L., Liaw, P.K. et al. Effect of Nb content on thermal stability, mechanical and corrosion behaviors of hypoeutectic CoCrFeNiNbχ high-entropy alloys. Journal of Materials Research 33, 3276–3286 (2018). https://doi.org/10.1557/jmr.2018.103

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  • DOI: https://doi.org/10.1557/jmr.2018.103