Effect of Sic Nano-Particles on Microstructure and Mechanical Properties of the Cocrfemnni High Entropy Alloy
JOURNAL OF ALLOYS AND COMPOUNDS(2017)
摘要
Novel metal matrix nanocomposites were designed exploring the CoCrFeMnNi high entropy alloy as a matrix and SiC spherical nanoparticles with a diameter of 20-50 nm as a reinforcement phase, and manufactured by mechanical alloying followed by hot isostatic sintering. After reaction at 1000 degrees C for 15 min the microstructure consisted of a matrix with a face centered solid solution of all elemental ingredients with traces of M23C6/ M7C3 carbides ( where M - Cr, Fe, Co), s-phase and SiC nano-particles distributed along grain boundaries of the matrix. Additions of 5 wt% of SiC nano-particles increased the room temperature compressive yield strength of the CoCrFeMnNi base from 1180 MPa to 1480 MPa, accompanied by a decrease in compressive strength and plasticity. The results are discussed in terms of mechanisms controlling the strengthening process in nano-composites with high entropy alloy matrix. Crown Copyright (C) 2017 Published by Elsevier B.V. All rights reserved.
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关键词
High entropy alloys,Nano-composites,SiC particles,TEM
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