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Deformation behavior of nanocrystalline and ultrafine-grained CoCrCuFeNi high-entropy alloys

Published online by Cambridge University Press:  22 January 2019

Seungjin Nam
Affiliation:
School of Materials Science and Engineering, Kookmin University, Seoul 02707, Republic of Korea
Jun Yeon Hwang
Affiliation:
Institute of Advanced Composite Materials, Korea Institute of Science and Technology, Jeonbuk 55324, Republic of Korea
Jonggyu Jeon
Affiliation:
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
Jihye Park
Affiliation:
High Temperature Energy Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
Donghyun Bae
Affiliation:
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
Moon J. Kim*
Affiliation:
Department of Materials Science and Engineering, The University of Texas at Dallas, Richardson, Texas 75080, USA
Jae-Hun Kim*
Affiliation:
School of Materials Science and Engineering, Kookmin University, Seoul 02707, Republic of Korea
Hyunjoo Choi*
Affiliation:
School of Materials Science and Engineering, Kookmin University, Seoul 02707, Republic of Korea
*
a)Address all correspondence to these authors. e-mail: jaehunkim@kookmin.ac.kr
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Abstract

Nanocrystalline (NC) and ultrafine-grained (UFG) CoCrCuFeNi high-entropy alloy (HEA) with grain size ranging between 59 and 386 nm was produced via powder metallurgy and heat treatment. The as-sintered HEA exhibited two face-centered cubic (FCC) phases (CoCrFeNi-rich and Cu-rich phases) and a small grain size (59 nm), whereas the alloy after heat treatment at 1000 °C exhibited a CoCuFeNi-rich phase with FCC structure and relatively larger grain size (386 nm). Moreover, the yield strength decreased from 1930 to 883 MPa, and plastic strain to failure increased by 8–32%. In terms of microstructural evolution, grain boundary strengthening coupled with lattice distortion was the dominant strengthening mechanism for NC HEAs. Furthermore, the coefficient for boundary strengthening was higher in the HEAs than in the corresponding pure elemental metals with FCC structure, possibly because of significant lattice distortion. The UFG HEAs exhibited high strength and good ductility because of the activation of dislocation.

Type
Invited Paper
Copyright
Copyright © Materials Research Society 2019 

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