Effect of Ti addition on microstructure and wear resistance of AlCuFeMnNi high entropy alloy

doi:10.13251/j.issn.0254-6051.2023.03.042

Abstract

Abstract: In order to study the effect of Ti addition on microstructure and wear resistance of AlCuFeMnNi high entropy alloy, AlCuFeMnNi and AlCuFeMnNiTi alloys with equal molar ratio were prepared by vacuum arc melting technique. The phase composition, microstructure, hardness and tribological properties of the two alloys were tested by X-ray diffractometer, metallographic microscope, scanning electron microscope, microhardness tester and friction and wear tester. The results show that with the Ti addition, the phases of the AlCuFeMnNiTi alloy changes from FCC and BCC1 two-phase structure to FCC, BCC1 and BCC2 three-phase structure, and the lattice constant and cell volume of AlCuFeMnNiTi alloy increase. The microstructure of the both alloys are typical dendritic grains. The addition of Ti gradually refines the grains of the alloy, increases the area of the dendrite region, decreases the area of the intergranular region, and makes a small amount of leading phase BCC2 distributed dispersively in the dendrite region. After the addition of Ti, the hardness of the alloy increases from 423.5 HV0.5 to 498.0 HV0.5, the mass loss rate and friction coefficient decreases from 0.43% and 0.59 to 0.39% and 0.46, respectively, and the friction coefficient increases first and then stabilizes. The increase of hardness and wear resistance of the AlCuFeMnNiTi alloy is mainly due to the combined effects of fine grain strengthening, solution strengthening and crystal structure transformation to high strength phase caused by the Ti addition.

Key words: AlCuFeMnNi high entropy alloy, Ti addition, microstructure, wear resistance

CLC Number:

TG113.1

Ma Mingxing, Wang Bozhen, Wang Zhixin,Yang Cheng, Li Shangzhi, Dong Chen, Hou Runsen. Effect of Ti addition on microstructure and wear resistance of AlCuFeMnNi high entropy alloy[J]. Heat Treatment of Metals, 2023, 48(3): 254-258.

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