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Superior Low-Cycle Fatigue Properties of CoCrNi Compared to CoCrFeMnNi

12 Pages Posted: 20 Nov 2020 Publication Status: Accepted

See all articles by Kaiju Lu

Kaiju Lu

Karlsruhe Institute of Technology (KIT) - Institute for Applied Materials

Ankur Chauhan

Karlsruhe Institute of Technology (KIT) - Institute for Applied Materials

Mario Walter

Institute for Applied Materials, Karlsruhe Institute of Technology (KIT)

Aditya Srinivasan Tirunilai

Karlsruhe Institute of Technology (KIT) - Institute for Applied Materials

Mike Schneider

Institut für Werkstoffe, Ruhr-Universität Bochum

Guillaume Laplanche

Ruhr University of Bochum - Institute of Materials

Jens Freudenberger

Leibniz Institute for Solid State and Materials Research (IFW) - Institute for Metallic Materials

Alexander Kauffmann

Karlsruhe Institute of Technology (KIT) - Institute for Applied Materials

Martin Heilmaier

Karlsruhe Institute of Technology (KIT) - Institute for Applied Materials

Jarir Aktaa

Karlsruhe Institute of Technology (KIT) - Institute for Applied Materials

Abstract

We report on the low-cycle fatigue behavior of single-phase, face-centered cubic CoCrNi and CoCrFeMnNi at room temperature. Both alloys manifest cyclic hardening followed by softening and a near steady state until failure. CoCrNi exhibits higher strength, lower inelastic-strain, and longer lifetime than CoCrFeMnNi. For both alloys, microstructural investigations reveal no noticeable changes of texture, grain size and twin fraction. Nevertheless, CoCrNi exhibits planar dislocation structures, while CoCrFeMnNi shows well-defined wavy dislocation structures. This is due to CoCrNi lower stacking fault energy, which enhances planar slip and delays deformation localization leading to its superior fatigue resistance, compared to CoCrFeMnNi.

Keywords: High- and medium-entropy alloys, Fatigue, Transmission electron microscopy (TEM), Dislocation structure.

Suggested Citation

Lu, Kaiju and Chauhan, Ankur and Walter, Mario and Tirunilai, Aditya Srinivasan and Schneider, Mike and Laplanche, Guillaume and Freudenberger, Jens and Kauffmann, Alexander and Heilmaier, Martin and Aktaa, Jarir, Superior Low-Cycle Fatigue Properties of CoCrNi Compared to CoCrFeMnNi. Available at SSRN: https://ssrn.com/abstract=3734064 or http://dx.doi.org/10.2139/ssrn.3734064

Kaiju Lu (Contact Author)

Karlsruhe Institute of Technology (KIT) - Institute for Applied Materials ( email )

Hermann-von-Helmholtz-Platz 1
Eggenstein-Leopoldshafen, 76344
Germany

Ankur Chauhan

Karlsruhe Institute of Technology (KIT) - Institute for Applied Materials ( email )

Hermann-von-Helmholtz-Platz 1
Eggenstein-Leopoldshafen, 76344
Germany

Mario Walter

Institute for Applied Materials, Karlsruhe Institute of Technology (KIT) ( email )

Aditya Srinivasan Tirunilai

Karlsruhe Institute of Technology (KIT) - Institute for Applied Materials ( email )

Mike Schneider

Institut für Werkstoffe, Ruhr-Universität Bochum

Guillaume Laplanche

Ruhr University of Bochum - Institute of Materials

Universitätsstraße 150
Bochum, 44801
Germany

Jens Freudenberger

Leibniz Institute for Solid State and Materials Research (IFW) - Institute for Metallic Materials

Helmholtzstr. 20
01069 Dresden
Germany

Alexander Kauffmann

Karlsruhe Institute of Technology (KIT) - Institute for Applied Materials ( email )

Martin Heilmaier

Karlsruhe Institute of Technology (KIT) - Institute for Applied Materials ( email )

Jarir Aktaa

Karlsruhe Institute of Technology (KIT) - Institute for Applied Materials

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