Effect of Si addition on microstructure and properties of as-cast CoCrFeMnNi high entropy alloy

doi:10.13251/j.issn.0254-6051.2024.02.007

Abstract

Abstract: CoCrFeMnNiSi_x(x=0,0.3, 0.6, 0.9) high entropy alloys were fabricated by cold crucible levitation melting. The changes of the microstructure of the alloy after the addition of silicon were analyzed by means of X-ray diffraction, scanning electron microscope and the attached energy spectrometer. A series of tests on the hardness, room temperature friction and wear and room temperature compression properties of CoCrFeMnNiSi_x alloy were carried out. The results show that CoCrFeMnNi alloy is a single-phase FCC structure. With the increase of silicon content, Mn, Ni and Si elements are enriched at the grain boundary of the FCC base phase, and silicide are gradually precipitated, finally resulting in fine grain strengthening and dispersion strengthening, which improves the hardness, wear resistance, compressive strength and yield strength of the alloy. Among them, CoCrFeMnNiSi_0.9 has the best comprehensive performance.

Key words: high entropy alloy, silicon addition, microstructure, grain refinement, mechanical properties

CLC Number:

TG146.1

Li Rongbin, Zong Zaikang, Zhang Zhixi, Zhang Rulin. Effect of Si addition on microstructure and properties of as-cast CoCrFeMnNi high entropy alloy[J]. Heat Treatment of Metals, 2024, 49(2): 45-52.

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