Preparation and Properties of CoCuFeNiTi High Entropy Alloy Coating

doi:10.11901/1005.3093.2020.541

Chinese Journal of Materials Research

2021, Vol. 35

Issue (8): 561-571 DOI: 10.11901/1005.3093.2020.541

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Preparation and Properties of CoCuFeNiTi High Entropy Alloy Coating

WANG Gen, LI Xinmei(

), LU Caibin, WANG Songchen, CHAI Cheng

College of Mechanical Engineering, Xinjiang University, Urumqi 830047, China

Cite this article:

WANG Gen, LI Xinmei, LU Caibin, WANG Songchen, CHAI Cheng. Preparation and Properties of CoCuFeNiTi High Entropy Alloy Coating. Chinese Journal of Materials Research, 2021, 35(8): 561-571.

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Abstract

The CoCuFeNiTi high entropy alloy coating was prepared by laser cladding technology on the surface of 40 Cr steel, which then was characterized by means of SEM, XRD and EDS, as well as microhardness tester, wear resistance and corrosion resistance test. The results show that among others the coating prepared by laser beam with power of 700 W and scanning speed of 6 mm/s presents the best in surface quality and metallurgical bonding between the coating and the substrate. The coating is mainly composed of FCC phase, a small amount of Cu₄Ti phase and nano precipitates rich in Cu. The microstructure of the coating shows typical dendrite structure, while Cu segregated in between dendrites as micro- and/or nano-particulates rich in Cu. The microhardness of the coating is 438.83HV, which is 1.7 times that of 40 Cr steel. The wear mass loss of the coating is about 1/2 that of 40 Cr steel, indicating the coating has better wear resistance. The wear of the coating is mainly adhesive wear, accompanied by a certain degree of abrasive grain wear. The corrosion resistance of the coating in acidic medium of pH=4 and 3.5%NaCl solution was better than that of 40 Cr steel.

Key words: metallic materials high entropy alloy electrochemical corrosion wear

Received: 21 December 2020

ZTFLH:

TL214+.6

Fund: Supported by National Natural Science Foundation of China(51865055);Tianshan Talent Program of Xinjiang Autonomous Region(201720025);Postgraduate Innovation Project of Xinjiang Autonomous Region(XJ2020G051)

About author: LI Xinmei, Tel:17716909771, E-mail: lxmxj2009@126.com

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	Gen WANG
	Xinmei LI
	Caibin LU
	Songchen WANG
	Cheng CHAI

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.541 OR https://www.cjmr.org/EN/Y2021/V35/I8/561

Table 1 Single factor test table of laser power

Table 2 Single factor test table of scanning speed

Fig.1 Single channel coating with different laser power (a) 500 W; (b) 600 W; (c) 700 W; (d) 800 W; (e) 900 W; (f) 1000 W

Fig.2 Cross section morphology of coating prepared by different laser power (a) 500 W; (b) 600 W; (c) 700 W; (d) 800 W; (e) 900 W; (f) 1000 W

Fig.3 Single channel coating with different scanning speeds (a) 4 mm/s; (b) 5 mm/s; (c) 6 mm/s; (d) 7 mm/s

Fig.4 Prepared at different laser scanning speeds (a) 4 mm/s; (b) 5 mm/s; (c) 6 mm/s; (d) 7 mm/s

Fig.5 XRD pattern of the powder and CoCuFeNiTi high entropy alloy coating

Fig.6 Microstructure of CoCuFeNiTi high entropy alloy coating

Fig.7 Distribution of each element in the CoCuFeNiTi high entropy alloy coating

Table 3 Mixing enthalpy of among elements (kJ·mol^-1)

Fig.8 Hardness distribution curve of CoCuFeNiTi high entropy alloy coating

Fig.9 Microstructure of heat-affected zone

Fig.10 Wear loss mass of CoCuFeNiTi high entropy alloy coating and matrix

Fig.11 Wear morphology of CoCuFeNiTi high entropy alloy coating

Fig.12 Polarization curves of CoCuFeNiTi high entropy alloy coating and matrix in different corrosive solution (a) polarization curves of acidity with pH=4; (b) polarization curve in 3.5%NaCl solution; (c) polarization curve of CoCuFeNiTi high entropy alloy coating in different corrosive solution

Table 4 E_corr, I_corr, E_p and I_pass of matrix and CoCuFeNiTi high entropy alloy coating in different corrosive solution

Fig.13 Corrosion morphology of CoCuFeNiTi high entropy alloy coating and matrix in pH=4 acidic solution (a, b) corrosion morphology of CoCuFeNiTi high entropy alloy coating; (c, d) corrosion morphology of matrix)

Fig.14 Corrosion morphology of CoCuFeNiTi high entropy alloy coating and substrate in 3.5%NaCl solution (a, b) corrosion morphology of CoCuFeNiTi high entropy alloy coating; (c, d) corrosion morphology of matrix

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