J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (6): 1003-1007.DOI: 10.1016/j.jmst.2018.12.015

Special Issue: High Entropy Alloys 2018-2020

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Deposition of FeCoNiCrMn high entropy alloy (HEA) coating via cold spraying

Shuo Yina*(), Wenya Lib*(), Bo Songc, Xingchen Yand, Min Kuangd, Yaxin Xub, Kui Wend, Rocco Lupoia*()   

  1. a Trinity College Dublin, The University of Dublin, Department of Mechanical and Manufacturing Engineering, Parsons Building, Dublin 2, Ireland
    b State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Friction Welding Technologies, School of Materials Science and Engineering,
    Northwestern Polytechnical University, Xi’an, 710072, China
    c State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, China
    d National Engineering Laboratory for Modern Materials Surface Engineering Technology, The Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou, 510651, China
  • Received:2018-11-28 Revised:2018-12-13 Accepted:2018-12-16 Online:2019-06-20 Published:2019-06-19
  • Contact: Yin Shuo,Li Wenya,Lupoi Rocco
  • About author:

    1 These authors contributed equally to this work.

Abstract:

High entropy alloys (HEAs) are of great interest in the community of materials science and engineering due to their unique phase structure. They are constructed with five or more principal alloying elements in equimolar or near-equimolar ratio. Therefore, HEAs can derive their performance from multiple principal elements rather than a single element. In this work, solid-state cold spraying (CS) was applied for the first time to produce FeCoNiCrMn HEA coating. The experimental results confirm that CS can be used to produce a thick HEA coating with low porosity. As a low-temperature deposition process, CS completely retained the HEA phase structure in the coating without any phase transformation. The characterization also reveals that the grains in the CSed HEA coating had experienced significant refinement as compared to those in the as-received HEA powder due the occurrence of dynamic recrystallization at the highly deformed interparticle region. Due to the increased dislocation density and grain boundaries, CSed HEA coating was much harder than the as-received powder. The tribological study shows that the CSed FeCoNiCrMn HEA coating resulted in lower wear rate than laser cladded HEA coatings.

Key words: Cold spraying (CS), High entropy alloys (HEAs), Metal matrix composites (MMCs), Phase change