Effect of Ti Doping on Microstructure and Wear Resistance of CoCrCuFeMn High-entropy Alloys

doi:10.3901/JME.2020.10.110

Abstract

Abstract: High-entropy alloys are considered as the development direction of the next-generation metal materials due to its many excellent properties, which may break through the performance limits of traditional alloys. CoCrCuFeMn is as an important high-entropy alloy system. There are few reports on the effect of Ti doping on their microstructure and properties at present. CoCrCuFeMn and CoCrCuFeMnTi high entropy alloys are fabricated by melting-casting method. The phase structure, microstructure and wear resistance for this alloy without and with Ti doping are investigated by XRD, OM, SEM, EDS, microhardness tester and friction-wear tester, respectively. The results show that CoCrCuFeMn alloy has FCC1+FCC2 dual phase structure. The phase structure transforms into BCC+HCP dual phase after Ti doping. Both alloys are typical dendrite structures. The interdendrite region is mainly Cu-rich area, and Mn has the smallest segregation coefficient. After Ti doping, the enrichment region of the alloying elements does not change, but the segregation coefficient decreases for alloy elements. The microhardness increases from 219.6 HV to 693.8 HV after Ti adding, and the average friction coefficient and the mass loss rate decrease from 0.57 and 4.14% to 0.55 and 1.28%, respectively. The improvement of hardness and wear resistance for Ti doping alloy is mainly due to the combined effects of phase transformation, solid solution strengthening, fine grain strengthening and lower internal stress. The research results not only help to improve and enrich the related theory of Ti doping on the properties of CoCrCuFeMn alloy, but also provide theoretical support for their subsequent scientific research and engineering application.

Key words: high-entropy alloy, CoCrCuFeMn, microstructure, wear resistance

CLC Number:

TG156

MA Mingxing, WANG Zhixin, ZHOU Jiachen, LIANG Cun, ZHU Dachuan, ZHANG Deliang. Effect of Ti Doping on Microstructure and Wear Resistance of CoCrCuFeMn High-entropy Alloys[J]. Journal of Mechanical Engineering, 2020, 56(10): 110-116.

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