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

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • X. H. Chen
  • X. Q. Zhuang
  • J. W. Mo
  • J. Y. He
  • X. Y. Zhou
  • W. H. Liu

Detail(s)

Original languageEnglish
Pages (from-to)278-286
Journal / PublicationMaterials Research Letters
Volume10
Issue number4
Online published18 Feb 2022
Publication statusPublished - 2022

Link(s)

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.

Research Area(s)

  • Medium entropy alloy, hydrogen embrittlement, grain boundary segregation, INTERGRANULAR FRACTURE, NICKEL, DEFORMATION, SEGREGATION, PHOSPHORUS, CARBON

Citation Format(s)

Enhanced resistance to hydrogen embrittlement in a CrCoNi-based medium-entropy alloy via grain-boundary decoration of boron. / Chen, X. H.; Zhuang, X. Q.; Mo, J. W. et al.
In: Materials Research Letters, Vol. 10, No. 4, 2022, p. 278-286.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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