Hydrogen resistance of a 1 GPa strong equiatomic CoCrNi medium entropy alloy

Chandrahaasan Soundararajan; Hong Luo; Dierk Raabe; Zhiming Li

doi:10.1016/j.corsci.2020.108510

Hydrogen resistance of a 1 GPa strong equiatomic CoCrNi medium entropy alloy

Chandrahaasan Soundararajan
, Hong Luo^*
, Dierk Raabe
, Zhiming Li^*

^*Corresponding author for this work

Not published at VTT

Research output: Contribution to journal › Article › Scientific › peer-review

69 Citations (Scopus)

Abstract

In this work, we study the influence of hydrogen on the deformation behavior and microstructure evolution in an equiatomic CoCrNi medium entropy alloy (MEA) with an ultimate tensile strength of ∼1 GPa. Upon deformation, hydrogen-charged samples exhibit enhanced dislocation activity and nanotwinning. Hydrogen shows both positive and negative effects on the deformation behavior of the CoCrNi MEA. More specifically, it weakens grain boundaries during loading, leading to intergranular cracking. Also, it promotes the formation of twins which enhance the material’s resistance to crack propagation. The underlying mechanisms responsible for the hydrogen resistance of the CoCrNi MEA are discussed in detail.

Original language	English
Article number	108510
Journal	Corrosion Science
Volume	167
DOIs	https://doi.org/10.1016/j.corsci.2020.108510
Publication status	Published - May 2020
MoE publication type	A1 Journal article-refereed

Keywords

Deformation
Hydrogen
Medium entropy alloy
Microstructure
Twinning

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10.1016/j.corsci.2020.108510

Cite this

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title = "Hydrogen resistance of a 1 GPa strong equiatomic CoCrNi medium entropy alloy",

abstract = "In this work, we study the influence of hydrogen on the deformation behavior and microstructure evolution in an equiatomic CoCrNi medium entropy alloy (MEA) with an ultimate tensile strength of ∼1 GPa. Upon deformation, hydrogen-charged samples exhibit enhanced dislocation activity and nanotwinning. Hydrogen shows both positive and negative effects on the deformation behavior of the CoCrNi MEA. More specifically, it weakens grain boundaries during loading, leading to intergranular cracking. Also, it promotes the formation of twins which enhance the material{\textquoteright}s resistance to crack propagation. The underlying mechanisms responsible for the hydrogen resistance of the CoCrNi MEA are discussed in detail.",

keywords = "Deformation, Hydrogen, Medium entropy alloy, Microstructure, Twinning",

author = "Chandrahaasan Soundararajan and Hong Luo and Dierk Raabe and Zhiming Li",

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language = "English",

volume = "167",

journal = "Corrosion Science",

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T1 - Hydrogen resistance of a 1 GPa strong equiatomic CoCrNi medium entropy alloy

AU - Soundararajan, Chandrahaasan

AU - Luo, Hong

AU - Raabe, Dierk

AU - Li, Zhiming

PY - 2020/5

Y1 - 2020/5

N2 - In this work, we study the influence of hydrogen on the deformation behavior and microstructure evolution in an equiatomic CoCrNi medium entropy alloy (MEA) with an ultimate tensile strength of ∼1 GPa. Upon deformation, hydrogen-charged samples exhibit enhanced dislocation activity and nanotwinning. Hydrogen shows both positive and negative effects on the deformation behavior of the CoCrNi MEA. More specifically, it weakens grain boundaries during loading, leading to intergranular cracking. Also, it promotes the formation of twins which enhance the material’s resistance to crack propagation. The underlying mechanisms responsible for the hydrogen resistance of the CoCrNi MEA are discussed in detail.

AB - In this work, we study the influence of hydrogen on the deformation behavior and microstructure evolution in an equiatomic CoCrNi medium entropy alloy (MEA) with an ultimate tensile strength of ∼1 GPa. Upon deformation, hydrogen-charged samples exhibit enhanced dislocation activity and nanotwinning. Hydrogen shows both positive and negative effects on the deformation behavior of the CoCrNi MEA. More specifically, it weakens grain boundaries during loading, leading to intergranular cracking. Also, it promotes the formation of twins which enhance the material’s resistance to crack propagation. The underlying mechanisms responsible for the hydrogen resistance of the CoCrNi MEA are discussed in detail.

KW - Deformation

KW - Hydrogen

KW - Medium entropy alloy

KW - Microstructure

KW - Twinning

UR - https://www.scopus.com/pages/publications/85078905186

U2 - 10.1016/j.corsci.2020.108510

DO - 10.1016/j.corsci.2020.108510

M3 - Article

SN - 0010-938X

VL - 167

JO - Corrosion Science

JF - Corrosion Science

M1 - 108510

ER -

Hydrogen resistance of a 1 GPa strong equiatomic CoCrNi medium entropy alloy

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Keywords

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Hydrogen resistance of a 1 GPa strong equiatomic CoCrNi medium entropy alloy

Abstract

Keywords

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Hydrogen resistance of a 1 GPa strong equiatomic CoCrNi medium entropy alloy