Enhanced resistance to hydrogen embrittlement in a CrCoNi-based medium-entropy alloy via grain-boundary decoration of boron

X. H. Chen; X. Q. Zhuang; J. W. Mo; J. Y. He; T. Yang; X. Y. Zhou; W. H. Liu

doi:10.1080/21663831.2022.2033865

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Enhanced resistance to hydrogen embrittlement in a CrCoNi-based medium-entropy alloy via grain-boundary decoration of boron

Original Reports | 更新时间：2026-08-19

- Enhanced resistance to hydrogen embrittlement in a CrCoNi-based medium-entropy alloy via grain-boundary decoration of boron
- Materials Research Letters Vol. 10, Issue 4, Pages: 278-286(2022)
- 作者机构：
  
  1. a School of Materials Science and Engineering Harbin Institute of Technology,Shenzhen
  2. b State Key Lab of Powder Metallurgy Central South University
  3. c Department of Materials Science and Engineering City University of Hong Kong
  4. d Max-Planck-Institut für Eisenforschung GmbH
- 作者简介：
- 基金信息：
- DOI：10.1080/21663831.2022.2033865
  CLC：
- Online First：18 February 2022，
  
  Published：2022
- 稿件说明：
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X. H. Chen, X. Q. Zhuang, J. W. Mo, et al. Enhanced resistance to hydrogen embrittlement in a CrCoNi-based medium-entropy alloy via grain-boundary decoration of boron[J]. Materials Research Letters, 2022, 10(4): 278-286.
DOI：

X. H. Chen, X. Q. Zhuang, J. W. Mo, et al. Enhanced resistance to hydrogen embrittlement in a CrCoNi-based medium-entropy alloy via grain-boundary decoration of boron[J]. Materials Research Letters, 2022, 10(4): 278-286. DOI： 10.1080/21663831.2022.2033865.

摘要

Abstract

We found boron doping can substantially reduce the ductility-loss in the CrCoNi medium-entropy alloy after gas-hydrogen charging

from ∼71% to ∼46%

while the fracture mode transfers from predominantly intergranular to ductile transgranular dominated. The two alloys have no difference in phase-structures (single face-center-cubic)

grain sizes

and grain-boundary (GB) characters. However

atom probe tomography identified apparent GB decoration of boron up to 1.5 at.% and nanometer-scaled scattered borides in boron-doped CrCoNi. Such local chemical difference leads to enhanced GB cohesion and reduced hydrogen diffusivity along GBs

resulting in improved immunity against hydrogen-embrittlement and suppressed mechanical degradation in the boron-doped CrCoNi alloy.

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Related Institution

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