Additive manufacturing of high-strength CrMnFeCoNi high-entropy alloys-based composites with WC addition

doi:10.1016/j.jmst.2019.05.062

J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (11): 2430-2434.DOI: 10.1016/j.jmst.2019.05.062

Special Issue: High Entropy Alloys 2018-2020

• Orginal Article • Previous Articles Next Articles

Additive manufacturing of high-strength CrMnFeCoNi high-entropy alloys-based composites with WC addition

Jinfeng Li^a^*(), Shuo Xiang^b, Hengwei Luan^c, Abdukadir Amar^b, Xue Liu^a, Siyuan Lu^d, Yangyang Zeng^e, Guomin Le^a^*(), Xiaoying Wang^a, Fengsheng Qu^a, Chunli Jiang^a, Guannan Yang^f^*()

^aInstitute of Materials, China Academy of Engineering Physics, Mianyang 621907, China
^bCollege of Physics and Technology, Xinjiang University, Urumqi, Xinjiang 830046, China
^cSchool of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
^dSchool of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China
^eNational key laboratory of shock wave and detonation physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621907, China
^fSchool of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China

Received:2019-02-10 Revised:2019-03-15 Accepted:2019-05-26 Online:2019-11-05 Published:2019-10-21
Contact: Li Jinfeng,Le Guomin,Yang Guannan
About author:
¹The authors equally contributed to this work.

Abstract

Abstract:

Laser melting deposition with WC addition has been developed to fabricate high-strength CrMnFeCoNi-based high-entropy alloys-based composites. By this technique, a microstructure of compact refined equiaxed grains can be achieved, and the tensile strength can be remarkably improved. The sample with 5 wt% WC addition shows a promising mechanical performance with a tensile strength of 800 MPa and an elongation of 37%. The improvement in mechanical property may be attributed to the formation of Cr₂₃C₆ reinforcement precipitates, which could promote the heterogeneous nucleation of grains and hinder the propagation of slip bands.

Key words: High-entropy alloys, Laser metal deposition, Precipitates, Microstructures, Tensile test

Jinfeng Li, Shuo Xiang, Hengwei Luan, Abdukadir Amar, Xue Liu, Siyuan Lu, Yangyang Zeng, Guomin Le, Xiaoying Wang, Fengsheng Qu, Chunli Jiang, Guannan Yang. Additive manufacturing of high-strength CrMnFeCoNi high-entropy alloys-based composites with WC addition[J]. J. Mater. Sci. Technol., 2019, 35(11): 2430-2434.

Figures/Tables 5

Fig. 1. Schematic process of additive manufacturing of high-strength CrMnFeCoNi HEA-based composites with WC addition.

Fig. 2. (a) XRD spectra of the as-prepared CrMnFeCoNi HEA-based composites with different WC additions and (b) DSC curves of the CrMnFeCoNi HEA-based composites with different WC additions.

Fig. 3. IPF-X EBSD maps of the LMD-fabricated CrMnFeCoNi HEA-based composites with (a) 0 wt%, (b) 5 wt% and (c) 10 wt% WC additions. Grain size distribution of the samples with (a1) 0 wt%, (b1) 5 wt% and (c1) 10 wt% WC additions; (d-f) SEM images and EDS pattern (g) of the sample with 5 wt% WC addition. The blue zones in (g) represent the precipitates and the red zones represent the FCC matrix. (h) Enlarged EDS patterns of different element distributions of near a precipitate.

Fig. 4. Tensile curves of the LMD-fabricated CrMnFeCoNi HEA-based composites with different WC additions at (a) RT and (b) 873 K.

Fig. 5. (a-d) Fractographies of the CrMnFeCoNi HEA-based composite without WC addition and (e-h) fractographies of the CrMnFeCoNi HEA-based composite with 5 wt%WC addition.

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Additive manufacturing of high-strength CrMnFeCoNi high-entropy alloys-based composites with WC addition

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