Microstructure and Properties of AlCo x CrFeNiCu High-Entropy Alloy Coating Synthesized by Cold Spraying Assisted Induction Remelting

doi:10.11900/0412.1961.2021.00285

Acta Metall Sin

2023, Vol. 59

Issue (5): 703-712 DOI: 10.11900/0412.1961.2021.00285

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Microstructure and Properties of AlCo _x CrFeNiCu High-Entropy Alloy Coating Synthesized by Cold Spraying Assisted Induction Remelting

FENG Li¹^,²(

), WANG Guiping¹, MA Kai¹, YANG Weijie¹, AN Guosheng¹^,², LI Wensheng¹^,²

¹College of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
²State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China

Cite this article:

FENG Li, WANG Guiping, MA Kai, YANG Weijie, AN Guosheng, LI Wensheng. Microstructure and Properties of AlCo _x CrFeNiCu High-Entropy Alloy Coating Synthesized by Cold Spraying Assisted Induction Remelting. Acta Metall Sin, 2023, 59(5): 703-712.

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Abstract

High-entropy alloy coatings have a very wide range of industrial applications due to their outstanding mechanical properties and good wear resistance. High-entropy alloy coatings of AlCo _x CrFeNiCu (x = 0, 0.5, 1.0, 1.5, 2.0, mole fraction) on 45 steel substrates were successfully produced by cold spraying assisted induction remelting approach. The effect of Co content on the phase and microstructure of cold spraying-assisted high-entropy alloy coating was investigated. The findings reveal that the AlCo _x -CrFeNiCu high-entropy alloy coating produced using low-pressure cold spraying assisted induction remelting technique comprises of fcc + bcc two-phase mixed structure, with an equiaxed dendrite + interdendritic structure, with the dendrite being bcc and the interdendritic structure being fcc. The lattice distortion state of AlCo _x CrFeNiCu high-entropy alloy coating changes as the Co element changes; when x = 1.0, the lattice strain of AlCo₁CrFeNiCu high-entropy alloy coating is the largest. Increases in Co content promote an increase in dendrite number in AlCo _x CrFeNiCu high-entropy alloy coatings, as well as dendrite. The EDS analysis demonstrated that Fe, Cr, Co, and Ni were enriched in the dendrite, Cu was enriched in the interdendrite, and Al was evenly distributed throughout the coating. With an increase in Co content, the hardness of AlCo _x CrFeNiCu high-entropy alloy coating increases first and then decreases. When x = 1.0, the hardness of the AlCo₁CrFeNiCu high-entropy alloy coating is 562.5 HV, and the coating minimum's friction coefficient is 0.352.

Key words: cold spraying induction remelting high-entropy alloy coating friction and wear

Received: 12 July 2021

ZTFLH:

TG146

Fund: National Natural Science Foundation of China(52075234);National Key Research and Development Program of China(2016YFE0111400)

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	FENG Li
	WANG Guiping
	MA Kai
	YANG Weijie
	AN Guosheng
	LI Wensheng

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https://www.ams.org.cn/EN/10.11900/0412.1961.2021.00285 OR https://www.ams.org.cn/EN/Y2023/V59/I5/703

Table 1 Contents of each element in high-entropy alloy coating by induction remelting

Fig.1 Cross sectional SEM images of cold spray AlCo _x CrFeNiCu prefabricated alloy powder coatings
(a) x = 0 (b) x = 0.5 (c) x = 1.0 (d) x = 1.5 (e) x = 2.0

Fig.2 XRD spectra of induction remelting of AlCo _x -CrFeNiCu high-entropy alloy coatings

Table 2 Lattice constants of each phase in the AlCo _x -CrFeNiCu high-entropy alloy coating

Fig.3 Low (a1-e1) and locally high (a2-e2) magnified SEM images of surface morphologies of induction remelting AlCo _x CrFeNiCu high-entropy alloy (DR—dendrite, ID—interdendritic structure) (a1, a2) x = 0 (b1, b2) x = 0.5 (c1, c2) x = 1.0 (d1, d2) x = 1.5 (e1, e2) x = 2.0

Fig.4 TEM analyses of AlCo₁CrFeNiCu high-entropy alloy coating (a, b) bright field TEM images of coating (c) SAED pattern of DR (d) SAED pattern of ID

Fig.5 Cross sectional SEM image (a), surface SEM image and corresponding EDS (b) of induction remelting AlCo₁CrFeNiCu high-entropy alloy coating
Color online

Fig.6 Lattice strains of fcc and bcc phases (ε_fcc and ε_bcc) in AlCo _x CrFeNiCu high-entropy alloy coating varies with atomic size difference (δ)

Fig.7 Hardnesses (a) and friction coefficients (b) of AlCo _x CrFeNiCu high-entropy alloy coatings and 45 steel substrate
Color online

Fig.8 Average wear rates (a) and friction coefficients (b) of AlCo _x CrFeNiCu high-entropy alloy coatings

Fig.9 Low (a1-e1) and high (a2-e2) magmfied SEM images showing wear morphologies of AlCo _x CrFeNiCu high-entropy alloy coatings (a1, a2) x = 0 (b1, b2) x = 0.5 (c1, c2) x = 1.0 (d1, d2) x = 1.5 (e1, e2) x = 2.0

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