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CoCrFeMnNi high-entropy alloys reinforced with Laves phase by adding Nb and Ti elements

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Abstract

Laves phase plays a positive role in improving the strength of high-entropy alloys (HEAs); Nb and Ti elements have potential to promote Laves phase formation in some HEAs. For improving the strength of the face-centered cubic (FCC) CoCrFeMnNi HEA, a series of (CoCrFeMnNi)100−xNbx (atomic ratio: x = 0, 4, 8, 12, 16) and (CoCrFeMnNi)100−xTix (atomic ratio: x = 0, 2, 4, 6, 8, 12) HEAs were prepared by melting. The effects of Nb and Ti on the microstructure evolution and compressive properties of the CoCrFeMnNi HEAs were investigated. For (CoCrFeMnNi)100−xNbx HEAs, the second-phase (Laves and σ phase) volume fraction increased from 0 to 42%. The yield strength also increased gradually from 202 to 1010 MPa. However, the fracture strain decreased from 60% (no fracture) to 12% with increasing Nb content. For (CoCrFeMnNi)100−xTix HEAs, the yield strength increased from 202 to 1322 MPa. The Laves phase volume fraction also increased from 0 to 27%. However, the fracture strain decreased from 60% (no fracture) to 7.5% with increasing Ti content. Addition of Nb and Ti has a good effect on improving the strength of FCC CoCrFeMnNi HEA.

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Acknowledgment

This work was supported by the Fund of State Key Laboratory of Advanced Welding and Joining and National Natural Science Foundation of China (No. 51741404).

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Authors and Affiliations

  1. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, 150001, Harbin, China

    Gang Qin, Zibo Li, Ruirun Chen, Huiting Zheng, Chenlei Fan, Liang Wang, Yanqing Su, Hongsheng Ding, Jingjie Guo & Hengzhi Fu

  2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, 150001, Harbin, China

    Ruirun Chen

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  1. Gang Qin
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  2. Zibo Li
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Qin, G., Li, Z., Chen, R. et al. CoCrFeMnNi high-entropy alloys reinforced with Laves phase by adding Nb and Ti elements. Journal of Materials Research 34, 1011–1020 (2019). https://doi.org/10.1557/jmr.2018.468

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