Microstructure and Wear Resistance of CoCrFeNiTi x High Entropy Alloy Coating

doi:10.11901/1005.3093.2021.428

Chinese Journal of Materials Research

2023, Vol. 37

Issue (3): 219-227 DOI: 10.11901/1005.3093.2021.428

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Microstructure and Wear Resistance of CoCrFeNiTi _x High Entropy Alloy Coating

TIAN Zhigang, LI Xinmei(

), QIN Zhong, WANG Xiaohui, LIU Weibin, HUNG Yong

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

Cite this article:

TIAN Zhigang, LI Xinmei, QIN Zhong, WANG Xiaohui, LIU Weibin, HUNG Yong. Microstructure and Wear Resistance of CoCrFeNiTi _x High Entropy Alloy Coating. Chinese Journal of Materials Research, 2023, 37(3): 219-227.

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Abstract

CoCrFeNiTi _x (x=0, 0.2, 0.5, 0.8) high-entropy alloy coating was prepared on 40Cr steel surface by laser cladding technology and its thermodynamic parameters were calculated. The phase composition, microstructure, element distribution, hardness and wear resistance of the alloy were detected by X-ray diffractometer (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), microhardness tester and friction and wear tester. The effects of Ti content on the microstructure and wear resistance of the alloy were investigated. The results show that with the increase of Ti content, the alloy phase forms a body-centered cubic (BCC) structure on the basis of the face-centered cubic (FCC) structure. The microstructure in the middle of the cladding layer is composed of equiaaxial crystals with obvious grain boundaries and uniform grain distribution, and finally the columnar dendrites are formed. With the increase of Ti content, the hardness of cross section of the alloy increases gradually, and the highest is 412.32 HV_0.2, which is 1.8 times higher than that of the matrix. The wear amount and friction coefficient of the coating decrease accordingly. When Ti content is 0.8, the coating has the best wear resistance, the minimum wear amount is 6.8mg, and the friction coefficient is 0.35. The wear mechanism of coating is mainly abrasive wear, adhesive wear and oxidation wear.

Key words: metallic materials high entropy alloy coating laser cladding wear resistance

Received: 28 July 2021

ZTFLH:

TG131

Fund: National Natural Science Foundation of China(52161017);National Natural Science Foundation of China(51865055);Natural Science Foundation of Xinjiang(2022D01C386)

Corresponding Authors: LI Xinmei, Tel: 17716909771, E-mail: 35335499@qq.com

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	TIAN Zhigang
	LI Xinmei
	QIN Zhong
	WANG Xiaohui
	LIU Weibin
	HUNG Yong

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.428 OR https://www.cjmr.org/EN/Y2023/V37/I3/219

Table 1 Chemical composition of 40Cr steel

Table 2 Experimental process parameters

Table 3 Calculation parameters of CoCrFeNiTi _x high entropy alloy

Table 4 ΔH_ij^mix enthalpy of mixing of different atomic pairs in CoCrFeNiTi _x high entropy alloy (kJ/mol)^[26]

Fig.1 XRD spectrum of CoCrFeNiTi _x (x=0, 0.2, 0.5,0.8) high entropy alloy

Fig.2 SEM images of CoCrFeTi _x (x=0, 0.2, 0.5, 0.8) alloy with high entropy

Table 5 EDS analysis of CoCrFeNiTi _x high entropy alloy coating

Fig.3 Surface scanning and element distribution of CoCrFeNiTi _x (x=0, 0.5) high entropy alloy

Fig.4 Microhardness of CoCrFeNiTi _x (x=0, 0.2, 0.5, 0.8) high entropy alloy

Fig.5 Wear amount and average friction coefficient of CoCrFeNiTi _x (x=0, 0.2, 0.5, 0.8) high entropy alloy coating

Fig.6 3D morphology of wear trace of CoCrFeNiTi _x (x=0, 0.2, 0.5, 0.8) high entropy alloy coating

Fig.7 Wear surface morphology of 40Cr steel and CoCrFeNiTi _x (x=0, 0.2, 0.5, 0.8) alloy coatings

Table 6 EDS analysis of wear surface of CoCrFeNiTi _x (x=0, 0.2, 0.5, 0.8) high entropy alloy coating (atom fraction, %)

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