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A superfine eutectic microstructure and the mechanical properties of CoCrFeNiMox high-entropy alloys

Published online by Cambridge University Press:  26 June 2018

Yong Guo ,
Liang Liu ,
Yue Zhang ,
Jingang Qi ,
Bing Wang ,
Zuofu Zhao ,
Jian Shang  and
Jun Xiang
Yong Guo
Affiliation:
Department of Materials Science and Engineering, Liaoning University of Technology, Jinzhou Liaoning 121001, China
Liang Liu*
Affiliation:
Department of Materials Science and Engineering, Liaoning University of Technology, Jinzhou Liaoning 121001, China
Yue Zhang
Affiliation:
Department of Materials Science and Engineering, Liaoning University of Technology, Jinzhou Liaoning 121001, China
Jingang Qi
Affiliation:
Department of Materials Science and Engineering, Liaoning University of Technology, Jinzhou Liaoning 121001, China
Bing Wang
Affiliation:
Department of Materials Science and Engineering, Liaoning University of Technology, Jinzhou Liaoning 121001, China
Zuofu Zhao
Affiliation:
Department of Materials Science and Engineering, Liaoning University of Technology, Jinzhou Liaoning 121001, China
Jian Shang
Affiliation:
Department of Materials Science and Engineering, Liaoning University of Technology, Jinzhou Liaoning 121001, China
Jun Xiang
Affiliation:
Department of Materials Science and Engineering, Liaoning University of Technology, Jinzhou Liaoning 121001, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

A series of CoCrFeNiMox (x = 0.2, 0.4, 0.6, 0.8, 1.0, and 1.2) high-entropy alloys were designed to develop a eutectic high-entropy alloy system and to acquire a superfine eutectic structure. The results show that for the CoCrFeNiMox alloys, with the increase of Mo content from 0.2 to 1.2, the microstructures shift from a typical dendrite structure to a hypoeutectic microstructure (x = 0.6), and then to a fully eutectic microstructure (x = 0.8) with a lamellar spacing only 110 nm, and finally culminate in the hypereutectic structure (x = 1.0, x = 1.2). The XRD results show that CoCrFeNiMox alloys have a single FCC phase when x is 0.2 or 0.4. When Mo content is over 0.6, it begins to separate Cr9Mo21Ni20 intermetallic compounds. The hardness of the CoCrFeNiMox alloys is increasing significantly from 172.8 to 763.7 HV with the increase of Mo content. Meanwhile, the fracture strength increased but the ductility decreases. Among these alloys, the CoCrFeNiMo0.6 alloy shows excellent integrated mechanical properties of compressive fracture strength and strain, which are 2051 Mpa and 23%, respectively.

Keywords

high-entropy alloycrystal structureeutectic microstructuremechanical propertiesMo content
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 19: Focus Issue: Fundamental Understanding and Applications of High-Entropy Alloys , 14 October 2018 , pp. 3258 - 3265
Copyright
Copyright © Materials Research Society 2018 

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