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Influence of heat treatment on microstructure, mechanical behavior, and soft magnetic properties in an fcc-based Fe29Co28Ni29Cu7Ti7 high-entropy alloy

Published online by Cambridge University Press:  01 June 2018

Zhiqiang Fu ,
Benjamin E. MacDonald ,
Todd C. Monson ,
Baolong Zheng ,
Weiping Chen  and
Enrique J. Lavernia
Zhiqiang Fu
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Irvine, Irvine, California 92697, USA
Benjamin E. MacDonald
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Irvine, Irvine, California 92697, USA
Todd C. Monson
Affiliation:
Nanoscale Sciences, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
Baolong Zheng
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Irvine, Irvine, California 92697, USA
Weiping Chen
Affiliation:
Guangdong Key Laboratory for Advanced Metallic Materials Processing, South China University of Technology, Guangzhou, Guangdong 510640, China
Enrique J. Lavernia*
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Irvine, Irvine, California 92697, USA
*
a)Address all correspondence to this author. e-mail: lavernia@uci.edu
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Abstract

The influence of heat treatment (homogenization) on the microstructure, mechanical behavior, and soft magnetic properties of a face-centered cubic (fcc)-based high-entropy alloy (HEA), Fe29Co28Ni29Cu7Ti7, fabricated by casting, was investigated in detail. The as-cast Fe29Co28Ni29Cu7Ti7 HEA was composed of a primary fcc phase containing coherent dispersed L12 nanoprecipitates and trace amounts of a needle-like phase. The tensile yield strength (σ0.2), ultimate strength, and total elongation of the as-cast alloy are 917 MPa, 1060 MPa, and 1.8%, respectively. Following homogenization, the alloy having a single fcc phase shows a decrease of ∼ 55% in yield strength and a decrease of ∼ 36% in ultimate strength; however, the total elongation is increased from 1.8 to 52%. Saturation magnetization (Msat) is decreased from 111.54 to 110.34 Am2/kg, by contrast, coercivity (Hc) is increased from 266.65 to 966.89 A/m. The dissolution of precipitates and grain growth are mainly responsible for the changes in magnetic properties and mechanical behavior.

Keywords

high-entropy alloyssoft magnetic propertiesmicrostructureheat treatment
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 15: Focus Issue: Soft Magnetic Materials: Synthesis, Characterization, and Applications , 13 August 2018 , pp. 2214 - 2222
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

b)

This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/editor-manuscripts/.

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