Microstructure and wear resistance of AlCoCrFeMnZr near-eutectic high-entropy alloy

doi:10.13251/j.issn.0254-6051.2023.01.001

Abstract

Abstract: AlCoCrFeMnZr near-eutectic high-entropy alloy was prepared by vacuum melting, then its crystal structure, morphology, hardness and wear resistance were tested by means of XRD, SEM, microhardness tester and friction and wear testing machine. The results show that the phase structure of the AlCoCrFeMnZr alloy is BCC+HCP dual-phase structure, composing of primary phase and fine lamellar eutectic. The primary phase consists of the HCP phase enriched in Cr, Fe, and Zr, which grows in a dendritic manner. The main elements in the dendrite region (α phase) of the lamellar eutectic structure are Co, Cr and Fe, and the main elements in the intergranular (β phase) are Al and Zr, which conforms to the structure and element distribution of high-entropy alloys. The wear model changes from adhesive wear and abrasive wear to oxidative wear, and the friction factor shows a trend of increasing first and then decreasing, and the average friction factor is 0.5432, the microhardness is 768.8 HV0.5, that means the alloy has excellent hardness and wear resistance.

Key words: high entropy alloy, eutectic structure, structure, wear resistance

CLC Number:

TG113.1

Wang Zhixin, Yang Cheng, Ma Mingxing, Wang Bozhen, Dong Chen, Li Shangzhi, Hou Runsen. Microstructure and wear resistance of AlCoCrFeMnZr near-eutectic high-entropy alloy[J]. Heat Treatment of Metals, 2023, 48(1): 1-5.

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