# Grain size dependent deformation microstructure evolution and work-hardening in CoCrNi medium entropy alloy

https://mdr.nims.go.jp/datasets/03d338f4-a4e0-4de7-adb2-ac4ba2057ce3

## File

- [2024_JAMS_(Yoshida_HEA).pdf](https://mdr.nims.go.jp/filesets/614bb996-9f0c-4f9d-a4b4-ee9e085adac2/download) ([Detail](https://mdr.nims.go.jp/filesets/614bb996-9f0c-4f9d-a4b4-ee9e085adac2.md))

## Id

03d338f4-a4e0-4de7-adb2-ac4ba2057ce3

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-11-21T05:38:29.670900Z

## Updated at

2024-11-23T07:30:14.963614Z

## Published at

2024-11-23T07:30:16.053304Z

## Doi



## First published url

https://doi.org/10.1016/j.jalmes.2024.100123

## Date published

2024-11-03

## Recorded date published

2024-12

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Grain size dependent deformation microstructure evolution and work-hardening
    in CoCrNi medium entropy alloy
  title_type: original
  lang: en

## Description

- description: "This study clarified the grain size dependence of the deformation
    microstructure evolution and work-hardening behavior in CoCrNi medium entropy
    alloy. We fabricated fully recrystallized specimens with coarse-grained (CG)\r\nand
    ultrafine-grained (UFG) specimens by severe plastic deformation and subsequent
    annealing processes. Tensile deformation was applied to the specimens at room
    temperature. The UFG specimen exhibited both high strength and high ductility
    compared to conventional UFG metals due to the high work-hardening ability. In
    the CG specimen, three distinct types of deformation microstructures consisting
    of dislocations and deformation twins developed depending on grain orientations,
    similar to the single-crystalline specimens. In the UFG specimen, widely-extended
    stacking faults and randomly-tangled dislocations were found to coexist in most
    grains. Deformation twins were found to nucleate without evidence of dislocation
    reactions regardless of grain orientations, implying abnormal nucleation mechanisms
    of deformation twins in the UFG specimen. Dislocation\r\ndensities quantified
    by in-situ synchrotron XRD measurements during tensile deformation were higher
    in the UFG specimen than those in the CG specimen and conventional UFG metals.
    Our analysis showed that the workhardening behavior of the specimens was primarily
    controlled by increases in dislocation density as well as the introduction of
    planar defects during deformation. Through comparisons with the CG specimen and
    conventional UFG metals, we concluded that the excellent work-hardening ability
    of the UFG specimen was mainly due to the evolution of unique deformation microstructures
    and rapid increase in dislocation density, which could be due to inhibited dynamic
    recovery in the MEA."
  description_type: abstract
  lang: und

## Creator

- name: Shuhei Yoshida
  role: author
- name: Genki Yamashita
  role: author
- name: Takuto Ikeuchi
  role: author
- name: Yu Bai
  role: author
- name: Akinobu Shibata
  role: author
  orcid: https://orcid.org/0000-0001-8577-6411
- name: Nobuhiro Tsuji
  role: author

## Contact agent



## Publisher

organization: Elsevier BV

## Managing organization



## Keyword

- subject: Ultrafine-grained metals
  schema: not_defined
- subject: High/medium entropy alloys
  schema: not_defined
- subject: Deformation microstructure
  schema: not_defined
- subject: Deformation twins
  schema: not_defined
- subject: Grain boundary-mediated plasticity
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Journal of Alloys and Metallurgical Systems
  issn: '29499178'
  volume: '8'
  article_number: '100123'

## Conference



## Related item



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## Instrument



## Instrument operator



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## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



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## Process for specimen treatment



## Computational method



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## Fileset

- id: 614bb996-9f0c-4f9d-a4b4-ee9e085adac2
  filename: 2024_JAMS_(Yoshida_HEA).pdf
  content_type: application/pdf
  size: 9662136
  md5: c25f731b2b85dd4500d869a286967a6c

## Thumbnail

fileset_id: 614bb996-9f0c-4f9d-a4b4-ee9e085adac2
filename: 2024_JAMS_(Yoshida_HEA).pdf