Strain-rate effect upon the tensile behavior of CoCrFeNi high-entropy alloys

Abstract

High-entropy alloys could replace conventional materials in critical load-bearing applications, owing to their excellent mechanical properties. Supported by X-ray diffraction, microstructure analysis and tensile testing, the mechanical response of CoCrFeNi HEAs to varying strain rates was investigated. The alloys were found to be a single-phase face-centered cubic solid solution. Their tensile strength and ductility increased with rising strain rate. The dominant deformation mechanism of the high-entropy alloy was observed to shift from the dislocation motion at the lower strain rates to stacking faults at the higher strain rates. The CoCrFeNi high-entropy alloys exhibited greater hardness following tensile deformation with higher strain rates.

Keywords

Bearings (machine parts), Deformation, Entropy, Stacking faults, Stainless steel, Tensile strength, Tensile testing, X ray diffraction, CoCrFeNi, Conventional materials, Dominant deformation mechanism, Face-centered cubic, High entropy alloys, Microstructure analysis, Strength and ductilities, Tensile behaviors, Strain rate

Document Type

Journal Article

Date of Publication

2017

Publication Title

Materials Science and Engineering: A

Publisher

Elsevier

School

School of Engineering

RAS ID

23828

Comments

Huo, W., Zhou, H., Fang, F., Hu, X., Xie, Z., & Jiang, J. (2017). Strain-rate effect upon the tensile behavior of CoCrFeNi high-entropy alloys. Materials Science and Engineering: A, 689, 366-369. https://doi.org/10.1016/j.msea.2017.02.077

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Link to publisher version (DOI)

10.1016/j.msea.2017.02.077