Role of deformation twinning in fatigue of CrCoNi medium-entropy alloy at room temperature

Heczko, Milan; Mazánová, Veronika; Slone, Connor E.; Shih, Mulaine; George, Easo P.; Ghazisaeidi, Maryam; Polák, Jaroslav; Mills, Michael J.

doi:10.1016/j.scriptamat.2021.113985

Role of deformation twinning in fatigue of CrCoNi medium-entropy alloy at room temperature

Journal Article · Mon May 24 00:00:00 EDT 2021 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2021.113985· OSTI ID:1860593

^[1]; Mazánová, Veronika ^[1]; Slone, Connor E. ^[2]; Shih, Mulaine ^[3]; ^[4]; Ghazisaeidi, Maryam ^[3]; Polák, Jaroslav ^[5]; Mills, Michael J. ^[3]

The Ohio State Univ., Columbus, OH (United States); Czech Academy of Sciences, Brno (Czech Republic)
Exponent, Inc., Menlo Park, CA (United States)
The Ohio State Univ., Columbus, OH (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Univ. of Tennessee, Knoxville, TN (United States)
Czech Academy of Sciences, Brno (Czech Republic)

Here cylindrical specimens of CrCoNi alloy with electropolished surfaces were subjected to constant total strain amplitude low cycle fatigue. The alloy exhibited an initial period of cyclic hardening followed by cyclic softening until failure occurred. At the end of hardening stage at the peak of cyclic stress, well-developed persistent slip markings (PSMs) consisting of extrusions and intrusions were associated with thin deformation twins. A sophisticated experimental workflow was designed to extract information from the surface and the bulk of tested material. A combination of SEM, EBSD, ECCI, FIB and HR-STEM was used to study the internal structure and the surface profiles around the deformation twins, which were produced during the initial period of cyclic loading. Furthermore, localized cyclic plastic strain and stress concentrations near deformation twins led not only to early, well-developed PSMs, but also to the activation of TWIP and TRIP plasticity even at low macroscopic stress amplitudes.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); The Ohio State Univ., Columbus, OH (United States)

Sponsoring Organization:: Czechoslovak Microscopy Society; National Science Foundation (NSF); Thermo Fisher Scientific; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1860593

Alternate ID(s):: OSTI ID: 23199705

Journal Information:: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: N.A. Vol. 202; ISSN 1359-6462

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Medium-entropy alloys
crack initiation
deformation twinning
fatigue
high-entropy alloys
persistent slip marking

Role of deformation twinning in fatigue of CrCoNi medium-entropy alloy at room temperature

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